1 /* doio.c
2 *
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11 /*
12 * Far below them they saw the white waters pour into a foaming bowl, and
13 * then swirl darkly about a deep oval basin in the rocks, until they found
14 * their way out again through a narrow gate, and flowed away, fuming and
15 * chattering, into calmer and more level reaches.
16 *
17 * [p.684 of _The Lord of the Rings_, IV/vi: "The Forbidden Pool"]
18 */
19
20 /* This file contains functions that do the actual I/O on behalf of ops.
21 * For example, pp_print() calls the do_print() function in this file for
22 * each argument needing printing.
23 */
24
25 #include "EXTERN.h"
26 #define PERL_IN_DOIO_C
27 #include "perl.h"
28
29 #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
30 #ifndef HAS_SEM
31 #include <sys/ipc.h>
32 #endif
33 #ifdef HAS_MSG
34 #include <sys/msg.h>
35 #endif
36 #ifdef HAS_SHM
37 #include <sys/shm.h>
38 # ifndef HAS_SHMAT_PROTOTYPE
39 extern Shmat_t shmat (int, char *, int);
40 # endif
41 #endif
42 #endif
43
44 #ifdef I_UTIME
45 # if defined(_MSC_VER) || defined(__MINGW32__)
46 # include <sys/utime.h>
47 # else
48 # include <utime.h>
49 # endif
50 #endif
51
52 #ifdef O_EXCL
53 # define OPEN_EXCL O_EXCL
54 #else
55 # define OPEN_EXCL 0
56 #endif
57
58 #define PERL_MODE_MAX 8
59 #define PERL_FLAGS_MAX 10
60
61 #include <signal.h>
62
63 void
Perl_setfd_cloexec(int fd)64 Perl_setfd_cloexec(int fd)
65 {
66 assert(fd >= 0);
67 #if defined(HAS_FCNTL) && defined(F_SETFD) && defined(FD_CLOEXEC)
68 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
69 #endif
70 }
71
72 void
Perl_setfd_inhexec(int fd)73 Perl_setfd_inhexec(int fd)
74 {
75 assert(fd >= 0);
76 #if defined(HAS_FCNTL) && defined(F_SETFD) && defined(FD_CLOEXEC)
77 (void) fcntl(fd, F_SETFD, 0);
78 #endif
79 }
80
81 void
Perl_setfd_cloexec_for_nonsysfd(pTHX_ int fd)82 Perl_setfd_cloexec_for_nonsysfd(pTHX_ int fd)
83 {
84 assert(fd >= 0);
85 if(fd > PL_maxsysfd)
86 setfd_cloexec(fd);
87 }
88
89 void
Perl_setfd_inhexec_for_sysfd(pTHX_ int fd)90 Perl_setfd_inhexec_for_sysfd(pTHX_ int fd)
91 {
92 assert(fd >= 0);
93 if(fd <= PL_maxsysfd)
94 setfd_inhexec(fd);
95 }
96 void
Perl_setfd_cloexec_or_inhexec_by_sysfdness(pTHX_ int fd)97 Perl_setfd_cloexec_or_inhexec_by_sysfdness(pTHX_ int fd)
98 {
99 assert(fd >= 0);
100 if(fd <= PL_maxsysfd)
101 setfd_inhexec(fd);
102 else
103 setfd_cloexec(fd);
104 }
105
106
107 #define DO_GENOPEN_THEN_CLOEXEC(GENOPEN_NORMAL, GENSETFD_CLOEXEC) \
108 do { \
109 int res = (GENOPEN_NORMAL); \
110 if(LIKELY(res != -1)) GENSETFD_CLOEXEC; \
111 return res; \
112 } while(0)
113 #if defined(HAS_FCNTL) && defined(F_SETFD) && defined(FD_CLOEXEC) && \
114 defined(F_GETFD)
115 enum { CLOEXEC_EXPERIMENT = 0, CLOEXEC_AT_OPEN, CLOEXEC_AFTER_OPEN };
116 # define DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, TESTFD, GENOPEN_CLOEXEC, \
117 GENOPEN_NORMAL, GENSETFD_CLOEXEC) \
118 do { \
119 switch (strategy) { \
120 case CLOEXEC_EXPERIMENT: default: { \
121 int res = (GENOPEN_CLOEXEC), eno; \
122 if (LIKELY(res != -1)) { \
123 int fdflags = fcntl((TESTFD), F_GETFD); \
124 if (LIKELY(fdflags != -1) && \
125 LIKELY(fdflags & FD_CLOEXEC)) { \
126 strategy = CLOEXEC_AT_OPEN; \
127 } else { \
128 strategy = CLOEXEC_AFTER_OPEN; \
129 GENSETFD_CLOEXEC; \
130 } \
131 } else if (UNLIKELY((eno = errno) == EINVAL || \
132 eno == ENOSYS)) { \
133 res = (GENOPEN_NORMAL); \
134 if (LIKELY(res != -1)) { \
135 strategy = CLOEXEC_AFTER_OPEN; \
136 GENSETFD_CLOEXEC; \
137 } else if (!LIKELY((eno = errno) == EINVAL || \
138 eno == ENOSYS)) { \
139 strategy = CLOEXEC_AFTER_OPEN; \
140 } \
141 } \
142 return res; \
143 } \
144 case CLOEXEC_AT_OPEN: \
145 return (GENOPEN_CLOEXEC); \
146 case CLOEXEC_AFTER_OPEN: \
147 DO_GENOPEN_THEN_CLOEXEC(GENOPEN_NORMAL, GENSETFD_CLOEXEC); \
148 } \
149 } while(0)
150 #else
151 # define DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, TESTFD, GENOPEN_CLOEXEC, \
152 GENOPEN_NORMAL, GENSETFD_CLOEXEC) \
153 DO_GENOPEN_THEN_CLOEXEC(GENOPEN_NORMAL, GENSETFD_CLOEXEC)
154 #endif
155
156 #define DO_ONEOPEN_THEN_CLOEXEC(ONEOPEN_NORMAL) \
157 do { \
158 int fd; \
159 DO_GENOPEN_THEN_CLOEXEC(fd = (ONEOPEN_NORMAL), \
160 setfd_cloexec(fd)); \
161 } while(0)
162 #define DO_ONEOPEN_EXPERIMENTING_CLOEXEC(strategy, \
163 ONEOPEN_CLOEXEC, ONEOPEN_NORMAL) \
164 do { \
165 int fd; \
166 DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, \
167 fd, \
168 fd = (ONEOPEN_CLOEXEC), \
169 fd = (ONEOPEN_NORMAL), setfd_cloexec(fd)); \
170 } while(0)
171
172 #define DO_PIPESETFD_CLOEXEC(PIPEFD) \
173 do { \
174 setfd_cloexec((PIPEFD)[0]); \
175 setfd_cloexec((PIPEFD)[1]); \
176 } while(0)
177 #define DO_PIPEOPEN_THEN_CLOEXEC(PIPEFD, PIPEOPEN_NORMAL) \
178 DO_GENOPEN_THEN_CLOEXEC(PIPEOPEN_NORMAL, DO_PIPESETFD_CLOEXEC(PIPEFD))
179 #define DO_PIPEOPEN_EXPERIMENTING_CLOEXEC(strategy, PIPEFD, PIPEOPEN_CLOEXEC, \
180 PIPEOPEN_NORMAL) \
181 DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, \
182 (PIPEFD)[0], PIPEOPEN_CLOEXEC, \
183 PIPEOPEN_NORMAL, DO_PIPESETFD_CLOEXEC(PIPEFD))
184
185 int
Perl_PerlLIO_dup_cloexec(pTHX_ int oldfd)186 Perl_PerlLIO_dup_cloexec(pTHX_ int oldfd)
187 {
188 #if !defined(PERL_IMPLICIT_SYS) && defined(F_DUPFD_CLOEXEC)
189 /*
190 * struct IPerlLIO doesn't cover fcntl(), and there's no clear way
191 * to extend it, so for the time being this just isn't available on
192 * PERL_IMPLICIT_SYS builds.
193 */
194 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
195 PL_strategy_dup,
196 fcntl(oldfd, F_DUPFD_CLOEXEC, 0),
197 PerlLIO_dup(oldfd));
198 #else
199 DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_dup(oldfd));
200 #endif
201 }
202
203 int
Perl_PerlLIO_dup2_cloexec(pTHX_ int oldfd,int newfd)204 Perl_PerlLIO_dup2_cloexec(pTHX_ int oldfd, int newfd)
205 {
206 #if !defined(PERL_IMPLICIT_SYS) && defined(HAS_DUP3) && defined(O_CLOEXEC)
207 /*
208 * struct IPerlLIO doesn't cover dup3(), and there's no clear way
209 * to extend it, so for the time being this just isn't available on
210 * PERL_IMPLICIT_SYS builds.
211 */
212 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
213 PL_strategy_dup2,
214 dup3(oldfd, newfd, O_CLOEXEC),
215 PerlLIO_dup2(oldfd, newfd));
216 #else
217 DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_dup2(oldfd, newfd));
218 #endif
219 }
220
221 #if defined(OEMVS)
222 #if (__CHARSET_LIB == 1)
223 # include <stdio.h>
224 # include <stdlib.h>
225
setccsid(int fd,int ccsid)226 static int setccsid(int fd, int ccsid)
227 {
228 attrib_t attr;
229 int rc;
230
231 memset(&attr, 0, sizeof(attr));
232 attr.att_filetagchg = 1;
233 attr.att_filetag.ft_ccsid = ccsid;
234 attr.att_filetag.ft_txtflag = 1;
235
236 rc = __fchattr(fd, &attr, sizeof(attr));
237 return rc;
238 }
239
updateccsid(int fd,const char * path,int oflag,int perm)240 static void updateccsid(int fd, const char* path, int oflag, int perm)
241 {
242 int rc;
243 if (oflag & O_CREAT) {
244 rc = setccsid(fd, 819);
245 }
246 }
247
asciiopen(const char * path,int oflag)248 int asciiopen(const char* path, int oflag)
249 {
250 int rc;
251 int fd = open(path, oflag);
252 if (fd == -1) {
253 return fd;
254 }
255 updateccsid(fd, path, oflag, -1);
256 return fd;
257 }
258
asciiopen3(const char * path,int oflag,int perm)259 int asciiopen3(const char* path, int oflag, int perm)
260 {
261 int rc;
262 int fd = open(path, oflag, perm);
263 if (fd == -1) {
264 return fd;
265 }
266 updateccsid(fd, path, oflag, perm);
267 return fd;
268 }
269 #endif
270 #endif
271
272 int
Perl_PerlLIO_open_cloexec(pTHX_ const char * file,int flag)273 Perl_PerlLIO_open_cloexec(pTHX_ const char *file, int flag)
274 {
275 PERL_ARGS_ASSERT_PERLLIO_OPEN_CLOEXEC;
276 #if defined(O_CLOEXEC)
277 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
278 PL_strategy_open,
279 PerlLIO_open(file, flag | O_CLOEXEC),
280 PerlLIO_open(file, flag));
281 #else
282 DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_open(file, flag));
283 #endif
284 }
285
286 int
Perl_PerlLIO_open3_cloexec(pTHX_ const char * file,int flag,int perm)287 Perl_PerlLIO_open3_cloexec(pTHX_ const char *file, int flag, int perm)
288 {
289 PERL_ARGS_ASSERT_PERLLIO_OPEN3_CLOEXEC;
290 #if defined(O_CLOEXEC)
291 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
292 PL_strategy_open3,
293 PerlLIO_open3(file, flag | O_CLOEXEC, perm),
294 PerlLIO_open3(file, flag, perm));
295 #else
296 DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_open3(file, flag, perm));
297 #endif
298 }
299
300 #if defined(OEMVS)
301 #if (__CHARSET_LIB == 1)
302 #define TEMP_CCSID 819
303 #endif
Internal_Perl_my_mkstemp_cloexec(char * templte)304 static int Internal_Perl_my_mkstemp_cloexec(char *templte)
305 {
306 PERL_ARGS_ASSERT_MY_MKSTEMP_CLOEXEC;
307 # if defined(O_CLOEXEC)
308 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
309 PL_strategy_mkstemp,
310 Perl_my_mkostemp(templte, O_CLOEXEC),
311 Perl_my_mkstemp(templte));
312 # else
313 DO_ONEOPEN_THEN_CLOEXEC(Perl_my_mkstemp(templte));
314 # endif
315 }
316 int
Perl_my_mkstemp_cloexec(char * templte)317 Perl_my_mkstemp_cloexec(char *templte)
318 {
319 int tempfd = Internal_Perl_my_mkstemp_cloexec(templte);
320 # if defined(TEMP_CCSID)
321 setccsid(tempfd, TEMP_CCSID);
322 # endif
323 return tempfd;
324 }
325
326 # else /* Below is ! OEMVS */
327 int
Perl_my_mkstemp_cloexec(char * templte)328 Perl_my_mkstemp_cloexec(char *templte)
329 {
330 PERL_ARGS_ASSERT_MY_MKSTEMP_CLOEXEC;
331 # if defined(O_CLOEXEC)
332 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
333 PL_strategy_mkstemp,
334 Perl_my_mkostemp(templte, O_CLOEXEC),
335 Perl_my_mkstemp(templte));
336 # else
337 DO_ONEOPEN_THEN_CLOEXEC(Perl_my_mkstemp(templte));
338 # endif
339 }
340 #endif
341
342 int
Perl_my_mkostemp_cloexec(char * templte,int flags)343 Perl_my_mkostemp_cloexec(char *templte, int flags)
344 {
345 PERL_ARGS_ASSERT_MY_MKOSTEMP_CLOEXEC;
346 #if defined(O_CLOEXEC)
347 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
348 PL_strategy_mkstemp,
349 Perl_my_mkostemp(templte, flags | O_CLOEXEC),
350 Perl_my_mkostemp(templte, flags));
351 #else
352 DO_ONEOPEN_THEN_CLOEXEC(Perl_my_mkostemp(templte, flags));
353 #endif
354 }
355
356 #ifdef HAS_PIPE
357 int
Perl_PerlProc_pipe_cloexec(pTHX_ int * pipefd)358 Perl_PerlProc_pipe_cloexec(pTHX_ int *pipefd)
359 {
360 PERL_ARGS_ASSERT_PERLPROC_PIPE_CLOEXEC;
361 /*
362 * struct IPerlProc doesn't cover pipe2(), and there's no clear way
363 * to extend it, so for the time being this just isn't available on
364 * PERL_IMPLICIT_SYS builds.
365 */
366 # if !defined(PERL_IMPLICIT_SYS) && defined(HAS_PIPE2) && defined(O_CLOEXEC)
367 DO_PIPEOPEN_EXPERIMENTING_CLOEXEC(PL_strategy_pipe, pipefd,
368 pipe2(pipefd, O_CLOEXEC),
369 PerlProc_pipe(pipefd));
370 # else
371 DO_PIPEOPEN_THEN_CLOEXEC(pipefd, PerlProc_pipe(pipefd));
372 # endif
373 }
374 #endif
375
376 #ifdef HAS_SOCKET
377
378 int
Perl_PerlSock_socket_cloexec(pTHX_ int domain,int type,int protocol)379 Perl_PerlSock_socket_cloexec(pTHX_ int domain, int type, int protocol)
380 {
381 # if defined(SOCK_CLOEXEC)
382 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
383 PL_strategy_socket,
384 PerlSock_socket(domain, type | SOCK_CLOEXEC, protocol),
385 PerlSock_socket(domain, type, protocol));
386 # else
387 DO_ONEOPEN_THEN_CLOEXEC(PerlSock_socket(domain, type, protocol));
388 # endif
389 }
390
391 int
Perl_PerlSock_accept_cloexec(pTHX_ int listenfd,struct sockaddr * addr,Sock_size_t * addrlen)392 Perl_PerlSock_accept_cloexec(pTHX_ int listenfd, struct sockaddr *addr,
393 Sock_size_t *addrlen)
394 {
395 # if !defined(PERL_IMPLICIT_SYS) && \
396 defined(HAS_ACCEPT4) && defined(SOCK_CLOEXEC)
397 /*
398 * struct IPerlSock doesn't cover accept4(), and there's no clear
399 * way to extend it, so for the time being this just isn't available
400 * on PERL_IMPLICIT_SYS builds.
401 */
402 DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
403 PL_strategy_accept,
404 accept4(listenfd, addr, addrlen, SOCK_CLOEXEC),
405 PerlSock_accept(listenfd, addr, addrlen));
406 # else
407 DO_ONEOPEN_THEN_CLOEXEC(PerlSock_accept(listenfd, addr, addrlen));
408 # endif
409 }
410
411 #endif
412
413 #if defined (HAS_SOCKETPAIR) || \
414 (defined (HAS_SOCKET) && defined(SOCK_DGRAM) && \
415 defined(AF_INET) && defined(PF_INET))
416 int
Perl_PerlSock_socketpair_cloexec(pTHX_ int domain,int type,int protocol,int * pairfd)417 Perl_PerlSock_socketpair_cloexec(pTHX_ int domain, int type, int protocol,
418 int *pairfd)
419 {
420 PERL_ARGS_ASSERT_PERLSOCK_SOCKETPAIR_CLOEXEC;
421 # ifdef SOCK_CLOEXEC
422 DO_PIPEOPEN_EXPERIMENTING_CLOEXEC(PL_strategy_socketpair, pairfd,
423 PerlSock_socketpair(domain, type | SOCK_CLOEXEC, protocol, pairfd),
424 PerlSock_socketpair(domain, type, protocol, pairfd));
425 # else
426 DO_PIPEOPEN_THEN_CLOEXEC(pairfd,
427 PerlSock_socketpair(domain, type, protocol, pairfd));
428 # endif
429 }
430 #endif
431
432 static IO *
S_openn_setup(pTHX_ GV * gv,char * mode,PerlIO ** saveifp,PerlIO ** saveofp,int * savefd,char * savetype)433 S_openn_setup(pTHX_ GV *gv, char *mode, PerlIO **saveifp, PerlIO **saveofp,
434 int *savefd, char *savetype)
435 {
436 IO * const io = GvIOn(gv);
437
438 PERL_ARGS_ASSERT_OPENN_SETUP;
439
440 *saveifp = NULL;
441 *saveofp = NULL;
442 *savefd = -1;
443 *savetype = IoTYPE_CLOSED;
444
445 Zero(mode,sizeof(mode),char);
446 PL_forkprocess = 1; /* assume true if no fork */
447
448 /* If currently open - close before we re-open */
449 if (IoIFP(io)) {
450 if (IoTYPE(io) == IoTYPE_STD) {
451 /* This is a clone of one of STD* handles */
452 }
453 else {
454 const int old_fd = PerlIO_fileno(IoIFP(io));
455
456 if (inRANGE(old_fd, 0, PL_maxsysfd)) {
457 /* This is one of the original STD* handles */
458 *saveifp = IoIFP(io);
459 *saveofp = IoOFP(io);
460 *savetype = IoTYPE(io);
461 *savefd = old_fd;
462 }
463 else {
464 int result;
465
466 if (IoTYPE(io) == IoTYPE_PIPE)
467 result = PerlProc_pclose(IoIFP(io));
468 else if (IoIFP(io) != IoOFP(io)) {
469 if (IoOFP(io)) {
470 result = PerlIO_close(IoOFP(io));
471 PerlIO_close(IoIFP(io)); /* clear stdio, fd already closed */
472 }
473 else
474 result = PerlIO_close(IoIFP(io));
475 }
476 else
477 result = PerlIO_close(IoIFP(io));
478
479 if (result == EOF && old_fd > PL_maxsysfd) {
480 /* Why is this not Perl_warn*() call ? */
481 PerlIO_printf(Perl_error_log,
482 "Warning: unable to close filehandle %" HEKf
483 " properly.\n",
484 HEKfARG(GvENAME_HEK(gv))
485 );
486 }
487 }
488 }
489 IoOFP(io) = IoIFP(io) = NULL;
490 }
491 return io;
492 }
493
494 bool
Perl_do_openn(pTHX_ GV * gv,const char * oname,I32 len,int as_raw,int rawmode,int rawperm,PerlIO * supplied_fp,SV ** svp,I32 num_svs)495 Perl_do_openn(pTHX_ GV *gv, const char *oname, I32 len, int as_raw,
496 int rawmode, int rawperm, PerlIO *supplied_fp, SV **svp,
497 I32 num_svs)
498 {
499 PERL_ARGS_ASSERT_DO_OPENN;
500
501 if (as_raw) {
502 /* sysopen style args, i.e. integer mode and permissions */
503
504 if (num_svs != 0) {
505 Perl_croak(aTHX_ "panic: sysopen with multiple args, num_svs=%ld",
506 (long) num_svs);
507 }
508 return do_open_raw(gv, oname, len, rawmode, rawperm, NULL);
509 }
510 return do_open6(gv, oname, len, supplied_fp, svp, num_svs);
511 }
512
513 bool
Perl_do_open_raw(pTHX_ GV * gv,const char * oname,STRLEN len,int rawmode,int rawperm,Stat_t * statbufp)514 Perl_do_open_raw(pTHX_ GV *gv, const char *oname, STRLEN len,
515 int rawmode, int rawperm, Stat_t *statbufp)
516 {
517 PerlIO *saveifp;
518 PerlIO *saveofp;
519 int savefd;
520 char savetype;
521 char mode[PERL_MODE_MAX]; /* file mode ("r\0", "rb\0", "ab\0" etc.) */
522 IO * const io = openn_setup(gv, mode, &saveifp, &saveofp, &savefd, &savetype);
523 int writing = 0;
524 PerlIO *fp;
525
526 PERL_ARGS_ASSERT_DO_OPEN_RAW;
527
528 /* For ease of blame back to 5.000, keep the existing indenting. */
529 {
530 /* sysopen style args, i.e. integer mode and permissions */
531 STRLEN ix = 0;
532 const int appendtrunc =
533 0
534 #ifdef O_APPEND /* Not fully portable. */
535 |O_APPEND
536 #endif
537 #ifdef O_TRUNC /* Not fully portable. */
538 |O_TRUNC
539 #endif
540 ;
541 const int modifyingmode = O_WRONLY|O_RDWR|O_CREAT|appendtrunc;
542 int ismodifying;
543 SV *namesv;
544
545 /* It's not always
546
547 O_RDONLY 0
548 O_WRONLY 1
549 O_RDWR 2
550
551 It might be (in OS/390 and Mac OS Classic it is)
552
553 O_WRONLY 1
554 O_RDONLY 2
555 O_RDWR 3
556
557 This means that simple & with O_RDWR would look
558 like O_RDONLY is present. Therefore we have to
559 be more careful.
560 */
561 if ((ismodifying = (rawmode & modifyingmode))) {
562 if ((ismodifying & O_WRONLY) == O_WRONLY ||
563 (ismodifying & O_RDWR) == O_RDWR ||
564 (ismodifying & (O_CREAT|appendtrunc)))
565 TAINT_PROPER("sysopen");
566 }
567 mode[ix++] = IoTYPE_NUMERIC; /* Marker to openn to use numeric "sysopen" */
568
569 #if defined(USE_64_BIT_RAWIO) && defined(O_LARGEFILE)
570 rawmode |= O_LARGEFILE; /* Transparently largefiley. */
571 #endif
572
573 IoTYPE(io) = PerlIO_intmode2str(rawmode, &mode[ix], &writing);
574
575 namesv = newSVpvn_flags(oname, len, SVs_TEMP);
576 fp = PerlIO_openn(aTHX_ NULL, mode, -1, rawmode, rawperm, NULL, 1, &namesv);
577 }
578 return openn_cleanup(gv, io, fp, mode, oname, saveifp, saveofp, savefd,
579 savetype, writing, 0, NULL, statbufp);
580 }
581
582 bool
Perl_do_open6(pTHX_ GV * gv,const char * oname,STRLEN len,PerlIO * supplied_fp,SV ** svp,U32 num_svs)583 Perl_do_open6(pTHX_ GV *gv, const char *oname, STRLEN len,
584 PerlIO *supplied_fp, SV **svp, U32 num_svs)
585 {
586 PerlIO *saveifp;
587 PerlIO *saveofp;
588 int savefd;
589 char savetype;
590 char mode[PERL_MODE_MAX]; /* file mode ("r\0", "rb\0", "ab\0" etc.) */
591 IO * const io = openn_setup(gv, mode, &saveifp, &saveofp, &savefd, &savetype);
592 int writing = 0;
593 PerlIO *fp;
594 bool was_fdopen = FALSE;
595 char *type = NULL;
596
597 PERL_ARGS_ASSERT_DO_OPEN6;
598
599 /* For ease of blame back to 5.000, keep the existing indenting. */
600 {
601 /* Regular (non-sys) open */
602 char *name;
603 STRLEN olen = len;
604 char *tend;
605 int dodup = 0;
606 bool in_raw = 0, in_crlf = 0, out_raw = 0, out_crlf = 0;
607
608 /* Collect default raw/crlf info from the op */
609 if (PL_op && PL_op->op_type == OP_OPEN) {
610 /* set up IO layers */
611 const U8 flags = PL_op->op_private;
612 in_raw = (flags & OPpOPEN_IN_RAW);
613 in_crlf = (flags & OPpOPEN_IN_CRLF);
614 out_raw = (flags & OPpOPEN_OUT_RAW);
615 out_crlf = (flags & OPpOPEN_OUT_CRLF);
616 }
617
618 type = savepvn(oname, len);
619 tend = type+len;
620 SAVEFREEPV(type);
621
622 /* Lose leading and trailing white space */
623 while (isSPACE(*type))
624 type++;
625 while (tend > type && isSPACE(tend[-1]))
626 *--tend = '\0';
627
628 if (num_svs) {
629 const char *p;
630 STRLEN nlen = 0;
631 /* New style explicit name, type is just mode and layer info */
632 #ifdef USE_STDIO
633 if (SvROK(*svp) && !memchr(oname, '&', len)) {
634 if (ckWARN(WARN_IO))
635 Perl_warner(aTHX_ packWARN(WARN_IO),
636 "Can't open a reference");
637 SETERRNO(EINVAL, LIB_INVARG);
638 fp = NULL;
639 goto say_false;
640 }
641 #endif /* USE_STDIO */
642 p = (SvOK(*svp) || SvGMAGICAL(*svp)) ? SvPV(*svp, nlen) : NULL;
643
644 if (p && !IS_SAFE_PATHNAME(p, nlen, "open")) {
645 fp = NULL;
646 goto say_false;
647 }
648
649 name = p ? savepvn(p, nlen) : savepvs("");
650
651 SAVEFREEPV(name);
652 }
653 else {
654 name = type;
655 len = tend-type;
656 }
657 IoTYPE(io) = *type;
658 if ((*type == IoTYPE_RDWR) && /* scary */
659 (*(type+1) == IoTYPE_RDONLY || *(type+1) == IoTYPE_WRONLY) &&
660 ((!num_svs || (tend > type+1 && tend[-1] != IoTYPE_PIPE)))) {
661 TAINT_PROPER("open");
662 mode[1] = *type++;
663 writing = 1;
664 }
665
666 if (*type == IoTYPE_PIPE) {
667 if (num_svs) {
668 if (type[1] != IoTYPE_STD) {
669 unknown_open_mode:
670 Perl_croak(aTHX_ "Unknown open() mode '%.*s'", (int)olen, oname);
671 }
672 type++;
673 }
674 do {
675 type++;
676 } while (isSPACE(*type));
677 if (!num_svs) {
678 name = type;
679 len = tend-type;
680 }
681 if (*name == '\0') {
682 /* command is missing 19990114 */
683 if (ckWARN(WARN_PIPE))
684 Perl_warner(aTHX_ packWARN(WARN_PIPE), "Missing command in piped open");
685 errno = EPIPE;
686 fp = NULL;
687 goto say_false;
688 }
689 if (!(*name == '-' && name[1] == '\0') || num_svs)
690 TAINT_ENV();
691 TAINT_PROPER("piped open");
692 if (!num_svs && name[len-1] == '|') {
693 name[--len] = '\0' ;
694 if (ckWARN(WARN_PIPE))
695 Perl_warner(aTHX_ packWARN(WARN_PIPE), "Can't open bidirectional pipe");
696 }
697 mode[0] = 'w';
698 writing = 1;
699 if (out_raw)
700 mode[1] = 'b';
701 else if (out_crlf)
702 mode[1] = 't';
703 if (num_svs > 1) {
704 fp = PerlProc_popen_list(mode, num_svs, svp);
705 }
706 else {
707 fp = PerlProc_popen(name,mode);
708 }
709 if (num_svs) {
710 if (*type) {
711 if (PerlIO_apply_layers(aTHX_ fp, mode, type) != 0) {
712 fp = NULL;
713 goto say_false;
714 }
715 }
716 }
717 } /* IoTYPE_PIPE */
718 else if (*type == IoTYPE_WRONLY) {
719 TAINT_PROPER("open");
720 type++;
721 if (*type == IoTYPE_WRONLY) {
722 /* Two IoTYPE_WRONLYs in a row make for an IoTYPE_APPEND. */
723 mode[0] = IoTYPE(io) = IoTYPE_APPEND;
724 type++;
725 }
726 else {
727 mode[0] = 'w';
728 }
729 writing = 1;
730
731 if (out_raw)
732 mode[1] = 'b';
733 else if (out_crlf)
734 mode[1] = 't';
735 if (*type == '&') {
736 duplicity:
737 dodup = PERLIO_DUP_FD;
738 type++;
739 if (*type == '=') {
740 dodup = 0;
741 type++;
742 }
743 if (!num_svs && !*type && supplied_fp) {
744 /* "<+&" etc. is used by typemaps */
745 fp = supplied_fp;
746 }
747 else {
748 PerlIO *that_fp = NULL;
749 int wanted_fd;
750 UV uv;
751 if (num_svs > 1) {
752 /* diag_listed_as: More than one argument to '%s' open */
753 Perl_croak(aTHX_ "More than one argument to '%c&' open",IoTYPE(io));
754 }
755 while (isSPACE(*type))
756 type++;
757 if (num_svs && (
758 SvIOK(*svp)
759 || (SvPOKp(*svp) && looks_like_number(*svp))
760 )) {
761 wanted_fd = SvUV(*svp);
762 num_svs = 0;
763 }
764 else if (isDIGIT(*type)
765 && grok_atoUV(type, &uv, NULL)
766 && uv <= INT_MAX
767 ) {
768 wanted_fd = (int)uv;
769 }
770 else {
771 const IO* thatio;
772 if (num_svs) {
773 thatio = sv_2io(*svp);
774 }
775 else {
776 GV * const thatgv = gv_fetchpvn_flags(type, tend - type,
777 0, SVt_PVIO);
778 thatio = GvIO(thatgv);
779 }
780 if (!thatio) {
781 #ifdef EINVAL
782 SETERRNO(EINVAL,SS_IVCHAN);
783 #endif
784 fp = NULL;
785 goto say_false;
786 }
787 if ((that_fp = IoIFP(thatio))) {
788 /* Flush stdio buffer before dup. --mjd
789 * Unfortunately SEEK_CURing 0 seems to
790 * be optimized away on most platforms;
791 * only Solaris and Linux seem to flush
792 * on that. --jhi */
793 /* On the other hand, do all platforms
794 * take gracefully to flushing a read-only
795 * filehandle? Perhaps we should do
796 * fsetpos(src)+fgetpos(dst)? --nik */
797 PerlIO_flush(that_fp);
798 wanted_fd = PerlIO_fileno(that_fp);
799 /* When dup()ing STDIN, STDOUT or STDERR
800 * explicitly set appropriate access mode */
801 if (that_fp == PerlIO_stdout()
802 || that_fp == PerlIO_stderr())
803 IoTYPE(io) = IoTYPE_WRONLY;
804 else if (that_fp == PerlIO_stdin())
805 IoTYPE(io) = IoTYPE_RDONLY;
806 /* When dup()ing a socket, say result is
807 * one as well */
808 else if (IoTYPE(thatio) == IoTYPE_SOCKET)
809 IoTYPE(io) = IoTYPE_SOCKET;
810 }
811 else {
812 SETERRNO(EBADF, RMS_IFI);
813 fp = NULL;
814 goto say_false;
815 }
816 }
817 if (!num_svs)
818 type = NULL;
819 if (that_fp) {
820 fp = PerlIO_fdupopen(aTHX_ that_fp, NULL, dodup);
821 }
822 else {
823 if (dodup)
824 wanted_fd = PerlLIO_dup_cloexec(wanted_fd);
825 else
826 was_fdopen = TRUE;
827 if (!(fp = PerlIO_openn(aTHX_ type,mode,wanted_fd,0,0,NULL,num_svs,svp))) {
828 if (dodup && wanted_fd >= 0)
829 PerlLIO_close(wanted_fd);
830 }
831 }
832 }
833 } /* & */
834 else {
835 while (isSPACE(*type))
836 type++;
837 if (*type == IoTYPE_STD && (!type[1] || isSPACE(type[1]) || type[1] == ':')) {
838 type++;
839 fp = PerlIO_stdout();
840 IoTYPE(io) = IoTYPE_STD;
841 if (num_svs > 1) {
842 /* diag_listed_as: More than one argument to '%s' open */
843 Perl_croak(aTHX_ "More than one argument to '>%c' open",IoTYPE_STD);
844 }
845 }
846 else {
847 if (num_svs) {
848 fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
849 }
850 else {
851 SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP);
852 type = NULL;
853 fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv);
854 }
855 }
856 } /* !& */
857 if (!fp && type && *type && *type != ':' && !isIDFIRST(*type))
858 goto unknown_open_mode;
859 } /* IoTYPE_WRONLY */
860 else if (*type == IoTYPE_RDONLY) {
861 do {
862 type++;
863 } while (isSPACE(*type));
864 mode[0] = 'r';
865 if (in_raw)
866 mode[1] = 'b';
867 else if (in_crlf)
868 mode[1] = 't';
869 if (*type == '&') {
870 goto duplicity;
871 }
872 if (*type == IoTYPE_STD && (!type[1] || isSPACE(type[1]) || type[1] == ':')) {
873 type++;
874 fp = PerlIO_stdin();
875 IoTYPE(io) = IoTYPE_STD;
876 if (num_svs > 1) {
877 /* diag_listed_as: More than one argument to '%s' open */
878 Perl_croak(aTHX_ "More than one argument to '<%c' open",IoTYPE_STD);
879 }
880 }
881 else {
882 if (num_svs) {
883 fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
884 }
885 else {
886 SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP);
887 type = NULL;
888 fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv);
889 }
890 }
891 if (!fp && type && *type && *type != ':' && !isIDFIRST(*type))
892 goto unknown_open_mode;
893 } /* IoTYPE_RDONLY */
894 else if ((num_svs && /* '-|...' or '...|' */
895 type[0] == IoTYPE_STD && type[1] == IoTYPE_PIPE) ||
896 (!num_svs && tend > type+1 && tend[-1] == IoTYPE_PIPE)) {
897 if (num_svs) {
898 type += 2; /* skip over '-|' */
899 }
900 else {
901 *--tend = '\0';
902 while (tend > type && isSPACE(tend[-1]))
903 *--tend = '\0';
904 for (; isSPACE(*type); type++)
905 ;
906 name = type;
907 len = tend-type;
908 }
909 if (*name == '\0') {
910 /* command is missing 19990114 */
911 if (ckWARN(WARN_PIPE))
912 Perl_warner(aTHX_ packWARN(WARN_PIPE), "Missing command in piped open");
913 errno = EPIPE;
914 fp = NULL;
915 goto say_false;
916 }
917 if (!(*name == '-' && name[1] == '\0') || num_svs)
918 TAINT_ENV();
919 TAINT_PROPER("piped open");
920 mode[0] = 'r';
921
922 if (in_raw)
923 mode[1] = 'b';
924 else if (in_crlf)
925 mode[1] = 't';
926
927 if (num_svs > 1) {
928 fp = PerlProc_popen_list(mode,num_svs,svp);
929 }
930 else {
931 fp = PerlProc_popen(name,mode);
932 }
933 IoTYPE(io) = IoTYPE_PIPE;
934 if (num_svs) {
935 while (isSPACE(*type))
936 type++;
937 if (*type) {
938 if (PerlIO_apply_layers(aTHX_ fp, mode, type) != 0) {
939 fp = NULL;
940 goto say_false;
941 }
942 }
943 }
944 }
945 else { /* layer(Args) */
946 if (num_svs)
947 goto unknown_open_mode;
948 name = type;
949 IoTYPE(io) = IoTYPE_RDONLY;
950 for (; isSPACE(*name); name++)
951 ;
952 mode[0] = 'r';
953
954 if (in_raw)
955 mode[1] = 'b';
956 else if (in_crlf)
957 mode[1] = 't';
958
959 if (*name == '-' && name[1] == '\0') {
960 fp = PerlIO_stdin();
961 IoTYPE(io) = IoTYPE_STD;
962 }
963 else {
964 if (num_svs) {
965 fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
966 }
967 else {
968 SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP);
969 type = NULL;
970 fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv);
971 }
972 }
973 }
974 }
975
976 say_false:
977 return openn_cleanup(gv, io, fp, mode, oname, saveifp, saveofp, savefd,
978 savetype, writing, was_fdopen, type, NULL);
979 }
980
981 /* Yes, this is ugly, but it's private, and I don't see a cleaner way to
982 simplify the two-headed public interface of do_openn. */
983 static bool
S_openn_cleanup(pTHX_ GV * gv,IO * io,PerlIO * fp,char * mode,const char * oname,PerlIO * saveifp,PerlIO * saveofp,int savefd,char savetype,int writing,bool was_fdopen,const char * type,Stat_t * statbufp)984 S_openn_cleanup(pTHX_ GV *gv, IO *io, PerlIO *fp, char *mode, const char *oname,
985 PerlIO *saveifp, PerlIO *saveofp, int savefd, char savetype,
986 int writing, bool was_fdopen, const char *type, Stat_t *statbufp)
987 {
988 int fd;
989 Stat_t statbuf;
990
991 PERL_ARGS_ASSERT_OPENN_CLEANUP;
992
993 Zero(&statbuf, 1, Stat_t);
994
995 if (!fp) {
996 if (IoTYPE(io) == IoTYPE_RDONLY && ckWARN(WARN_NEWLINE)
997 && should_warn_nl(oname)
998
999 )
1000 {
1001 GCC_DIAG_IGNORE_STMT(-Wformat-nonliteral); /* PL_warn_nl is constant */
1002 Perl_warner(aTHX_ packWARN(WARN_NEWLINE), PL_warn_nl, "open");
1003 GCC_DIAG_RESTORE_STMT;
1004 }
1005 goto say_false;
1006 }
1007
1008 if (ckWARN(WARN_IO)) {
1009 if ((IoTYPE(io) == IoTYPE_RDONLY) &&
1010 (fp == PerlIO_stdout() || fp == PerlIO_stderr())) {
1011 Perl_warner(aTHX_ packWARN(WARN_IO),
1012 "Filehandle STD%s reopened as %" HEKf
1013 " only for input",
1014 ((fp == PerlIO_stdout()) ? "OUT" : "ERR"),
1015 HEKfARG(GvENAME_HEK(gv)));
1016 }
1017 else if ((IoTYPE(io) == IoTYPE_WRONLY) && fp == PerlIO_stdin()) {
1018 Perl_warner(aTHX_ packWARN(WARN_IO),
1019 "Filehandle STDIN reopened as %" HEKf " only for output",
1020 HEKfARG(GvENAME_HEK(gv))
1021 );
1022 }
1023 }
1024
1025 fd = PerlIO_fileno(fp);
1026 /* Do NOT do: "if (fd < 0) goto say_false;" here. If there is no
1027 * fd assume it isn't a socket - this covers PerlIO::scalar -
1028 * otherwise unless we "know" the type probe for socket-ness.
1029 */
1030 if (IoTYPE(io) && IoTYPE(io) != IoTYPE_PIPE && IoTYPE(io) != IoTYPE_STD && fd >= 0) {
1031 if (PerlLIO_fstat(fd,&statbuf) < 0) {
1032 /* If PerlIO claims to have fd we had better be able to fstat() it. */
1033 (void) PerlIO_close(fp);
1034 goto say_false;
1035 }
1036 #ifndef PERL_MICRO
1037 if (S_ISSOCK(statbuf.st_mode))
1038 IoTYPE(io) = IoTYPE_SOCKET; /* in case a socket was passed in to us */
1039 #ifdef HAS_SOCKET
1040 else if (
1041 !(statbuf.st_mode & S_IFMT)
1042 && IoTYPE(io) != IoTYPE_WRONLY /* Dups of STD* filehandles already have */
1043 && IoTYPE(io) != IoTYPE_RDONLY /* type so they aren't marked as sockets */
1044 ) { /* on OS's that return 0 on fstat()ed pipe */
1045 char tmpbuf[256];
1046 Sock_size_t buflen = sizeof tmpbuf;
1047 if (PerlSock_getsockname(fd, (struct sockaddr *)tmpbuf, &buflen) >= 0
1048 || errno != ENOTSOCK)
1049 IoTYPE(io) = IoTYPE_SOCKET; /* some OS's return 0 on fstat()ed socket */
1050 /* but some return 0 for streams too, sigh */
1051 }
1052 #endif /* HAS_SOCKET */
1053 #endif /* !PERL_MICRO */
1054 }
1055
1056 /* Eeek - FIXME !!!
1057 * If this is a standard handle we discard all the layer stuff
1058 * and just dup the fd into whatever was on the handle before !
1059 */
1060
1061 if (saveifp) { /* must use old fp? */
1062 /* If fd is less that PL_maxsysfd i.e. STDIN..STDERR
1063 then dup the new fileno down
1064 */
1065 if (saveofp) {
1066 PerlIO_flush(saveofp); /* emulate PerlIO_close() */
1067 if (saveofp != saveifp) { /* was a socket? */
1068 PerlIO_close(saveofp);
1069 }
1070 }
1071 if (savefd != fd) {
1072 /* Still a small can-of-worms here if (say) PerlIO::scalar
1073 is assigned to (say) STDOUT - for now let dup2() fail
1074 and provide the error
1075 */
1076 if (fd < 0) {
1077 SETERRNO(EBADF,RMS_IFI);
1078 goto say_false;
1079 } else if (PerlLIO_dup2(fd, savefd) < 0) {
1080 (void)PerlIO_close(fp);
1081 goto say_false;
1082 }
1083 #ifdef VMS
1084 if (savefd != PerlIO_fileno(PerlIO_stdin())) {
1085 char newname[FILENAME_MAX+1];
1086 if (PerlIO_getname(fp, newname)) {
1087 if (fd == PerlIO_fileno(PerlIO_stdout()))
1088 vmssetuserlnm("SYS$OUTPUT", newname);
1089 if (fd == PerlIO_fileno(PerlIO_stderr()))
1090 vmssetuserlnm("SYS$ERROR", newname);
1091 }
1092 }
1093 #endif
1094
1095 #if !defined(WIN32)
1096 /* PL_fdpid isn't used on Windows, so avoid this useless work.
1097 * XXX Probably the same for a lot of other places. */
1098 {
1099 Pid_t pid;
1100 SV *sv;
1101
1102 sv = *av_fetch(PL_fdpid,fd,TRUE);
1103 SvUPGRADE(sv, SVt_IV);
1104 pid = SvIVX(sv);
1105 SvIV_set(sv, 0);
1106 sv = *av_fetch(PL_fdpid,savefd,TRUE);
1107 SvUPGRADE(sv, SVt_IV);
1108 SvIV_set(sv, pid);
1109 }
1110 #endif
1111
1112 if (was_fdopen) {
1113 /* need to close fp without closing underlying fd */
1114 int ofd = PerlIO_fileno(fp);
1115 int dupfd = ofd >= 0 ? PerlLIO_dup_cloexec(ofd) : -1;
1116 if (ofd < 0 || dupfd < 0) {
1117 if (dupfd >= 0)
1118 PerlLIO_close(dupfd);
1119 goto say_false;
1120 }
1121 PerlIO_close(fp);
1122 PerlLIO_dup2_cloexec(dupfd, ofd);
1123 setfd_inhexec_for_sysfd(ofd);
1124 PerlLIO_close(dupfd);
1125 }
1126 else
1127 PerlIO_close(fp);
1128 }
1129 fp = saveifp;
1130 PerlIO_clearerr(fp);
1131 fd = PerlIO_fileno(fp);
1132 }
1133 IoIFP(io) = fp;
1134
1135 IoFLAGS(io) &= ~IOf_NOLINE;
1136 if (writing) {
1137 if (IoTYPE(io) == IoTYPE_SOCKET
1138 || (IoTYPE(io) == IoTYPE_WRONLY && fd >= 0 && S_ISCHR(statbuf.st_mode)) ) {
1139 char *s = mode;
1140 if (*s == IoTYPE_IMPLICIT || *s == IoTYPE_NUMERIC)
1141 s++;
1142 *s = 'w';
1143 if (!(IoOFP(io) = PerlIO_openn(aTHX_ type,s,fd,0,0,NULL,0,NULL))) {
1144 PerlIO_close(fp);
1145 goto say_false;
1146 }
1147 }
1148 else
1149 IoOFP(io) = fp;
1150 }
1151 if (statbufp)
1152 *statbufp = statbuf;
1153
1154 return TRUE;
1155
1156 say_false:
1157 IoIFP(io) = saveifp;
1158 IoOFP(io) = saveofp;
1159 IoTYPE(io) = savetype;
1160 return FALSE;
1161 }
1162
1163 /* Open a temp file in the same directory as an original name.
1164 */
1165
1166 static bool
S_openindirtemp(pTHX_ GV * gv,SV * orig_name,SV * temp_out_name)1167 S_openindirtemp(pTHX_ GV *gv, SV *orig_name, SV *temp_out_name) {
1168 int fd;
1169 PerlIO *fp;
1170 const char *p = SvPV_nolen(orig_name);
1171 const char *sep;
1172
1173 /* look for the last directory separator */
1174 sep = strrchr(p, '/');
1175
1176 #ifdef DOSISH
1177 {
1178 const char *sep2;
1179 if ((sep2 = strrchr(sep ? sep : p, '\\')))
1180 sep = sep2;
1181 }
1182 #endif
1183 #ifdef VMS
1184 if (!sep) {
1185 const char *openp = strchr(p, '[');
1186 if (openp)
1187 sep = strchr(openp, ']');
1188 else {
1189 sep = strchr(p, ':');
1190 }
1191 }
1192 #endif
1193 if (sep) {
1194 sv_setpvn(temp_out_name, p, sep - p + 1);
1195 sv_catpvs(temp_out_name, "XXXXXXXX");
1196 }
1197 else
1198 sv_setpvs(temp_out_name, "XXXXXXXX");
1199
1200 {
1201 int old_umask = umask(0177);
1202 fd = Perl_my_mkstemp_cloexec(SvPVX(temp_out_name));
1203 umask(old_umask);
1204 }
1205
1206 if (fd < 0)
1207 return FALSE;
1208
1209 fp = PerlIO_fdopen(fd, "w+");
1210 if (!fp)
1211 return FALSE;
1212
1213 return do_openn(gv, "+>&", 3, 0, 0, 0, fp, NULL, 0);
1214 }
1215
1216 #if defined(HAS_UNLINKAT) && defined(HAS_RENAMEAT) && defined(HAS_FCHMODAT) && \
1217 (defined(HAS_DIRFD) || defined(HAS_DIR_DD_FD)) && !defined(NO_USE_ATFUNCTIONS) && \
1218 defined(HAS_LINKAT)
1219 # define ARGV_USE_ATFUNCTIONS
1220 #endif
1221
1222 /* Win32 doesn't necessarily return useful information
1223 * in st_dev, st_ino.
1224 */
1225 #ifndef DOSISH
1226 # define ARGV_USE_STAT_INO
1227 #endif
1228
1229 #define ARGVMG_BACKUP_NAME 0
1230 #define ARGVMG_TEMP_NAME 1
1231 #define ARGVMG_ORIG_NAME 2
1232 #define ARGVMG_ORIG_MODE 3
1233 #define ARGVMG_ORIG_PID 4
1234
1235 /* we store the entire stat_t since the ino_t and dev_t values might
1236 not fit in an IV. I could have created a new structure and
1237 transferred them across, but this seemed too much effort for very
1238 little win.
1239
1240 We store it even when the *at() functions are available, since
1241 while the C runtime might have definitions for these functions, the
1242 operating system or a specific filesystem might not implement them.
1243 eg. NetBSD 6 implements linkat() but only where the fds are AT_FDCWD.
1244 */
1245 #ifdef ARGV_USE_STAT_INO
1246 # define ARGVMG_ORIG_CWD_STAT 5
1247 #endif
1248
1249 #ifdef ARGV_USE_ATFUNCTIONS
1250 # define ARGVMG_ORIG_DIRP 6
1251 #endif
1252
1253 #ifdef ENOTSUP
1254 #define NotSupported(e) ((e) == ENOSYS || (e) == ENOTSUP)
1255 #else
1256 #define NotSupported(e) ((e) == ENOSYS)
1257 #endif
1258
1259 static int
S_argvout_free(pTHX_ SV * io,MAGIC * mg)1260 S_argvout_free(pTHX_ SV *io, MAGIC *mg) {
1261 PERL_UNUSED_ARG(io);
1262
1263 /* note this can be entered once the file has been
1264 successfully deleted too */
1265 assert(IoTYPE(io) != IoTYPE_PIPE);
1266
1267 /* mg_obj can be NULL if a thread is created with the handle open, in which
1268 case we leave any clean up to the parent thread */
1269 if (mg->mg_obj) {
1270 #ifdef ARGV_USE_ATFUNCTIONS
1271 SV **dir_psv;
1272 DIR *dir;
1273
1274 dir_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_DIRP, FALSE);
1275 assert(dir_psv && *dir_psv && SvIOK(*dir_psv));
1276 dir = INT2PTR(DIR *, SvIV(*dir_psv));
1277 #endif
1278 if (IoIFP(io)) {
1279 if (PL_phase == PERL_PHASE_DESTRUCT && PL_statusvalue == 0) {
1280 (void)argvout_final(mg, (IO*)io, FALSE);
1281 }
1282 else {
1283 SV **pid_psv;
1284 PerlIO *iop = IoIFP(io);
1285
1286 assert(SvTYPE(mg->mg_obj) == SVt_PVAV);
1287
1288 pid_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_PID, FALSE);
1289
1290 assert(pid_psv && *pid_psv);
1291
1292 if (SvIV(*pid_psv) == (IV)PerlProc_getpid()) {
1293 /* if we get here the file hasn't been closed explicitly by the
1294 user and hadn't been closed implicitly by nextargv(), so
1295 abandon the edit */
1296 SV **temp_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_TEMP_NAME, FALSE);
1297 const char *temp_pv = SvPVX(*temp_psv);
1298
1299 assert(temp_psv && *temp_psv && SvPOK(*temp_psv));
1300 (void)PerlIO_close(iop);
1301 IoIFP(io) = IoOFP(io) = NULL;
1302 #ifdef ARGV_USE_ATFUNCTIONS
1303 if (dir) {
1304 if (unlinkat(my_dirfd(dir), temp_pv, 0) < 0 &&
1305 NotSupported(errno))
1306 (void)UNLINK(temp_pv);
1307 }
1308 #else
1309 (void)UNLINK(temp_pv);
1310 #endif
1311 }
1312 }
1313 }
1314 #ifdef ARGV_USE_ATFUNCTIONS
1315 if (dir)
1316 closedir(dir);
1317 #endif
1318 }
1319
1320 return 0;
1321 }
1322
1323 static int
S_argvout_dup(pTHX_ MAGIC * mg,CLONE_PARAMS * param)1324 S_argvout_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
1325 PERL_UNUSED_ARG(param);
1326
1327 /* ideally we could just remove the magic from the SV but we don't get the SV here */
1328 SvREFCNT_dec(mg->mg_obj);
1329 mg->mg_obj = NULL;
1330
1331 return 0;
1332 }
1333
1334 /* Magic of this type has an AV containing the following:
1335 0: name of the backup file (if any)
1336 1: name of the temp output file
1337 2: name of the original file
1338 3: file mode of the original file
1339 4: pid of the process we opened at, to prevent doing the renaming
1340 etc in both the child and the parent after a fork
1341
1342 If we have useful inode/device ids in stat_t we also keep:
1343 5: a stat of the original current working directory
1344
1345 If we have unlinkat(), renameat(), fchmodat(), dirfd() we also keep:
1346 6: the DIR * for the current directory when we open the file, stored as an IV
1347 */
1348
1349 static const MGVTBL argvout_vtbl =
1350 {
1351 NULL, /* svt_get */
1352 NULL, /* svt_set */
1353 NULL, /* svt_len */
1354 NULL, /* svt_clear */
1355 S_argvout_free, /* svt_free */
1356 NULL, /* svt_copy */
1357 S_argvout_dup, /* svt_dup */
1358 NULL /* svt_local */
1359 };
1360
1361 PerlIO *
Perl_nextargv(pTHX_ GV * gv,bool nomagicopen)1362 Perl_nextargv(pTHX_ GV *gv, bool nomagicopen)
1363 {
1364 IO * const io = GvIOp(gv);
1365 SV *const old_out_name = PL_inplace ? newSVsv(GvSV(gv)) : NULL;
1366
1367 PERL_ARGS_ASSERT_NEXTARGV;
1368
1369 if (old_out_name)
1370 SAVEFREESV(old_out_name);
1371
1372 if (!PL_argvoutgv)
1373 PL_argvoutgv = gv_fetchpvs("ARGVOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
1374 if (io && (IoFLAGS(io) & (IOf_ARGV|IOf_START)) == (IOf_ARGV|IOf_START)) {
1375 IoFLAGS(io) &= ~IOf_START;
1376 if (PL_inplace) {
1377 assert(PL_defoutgv);
1378 Perl_av_create_and_push(aTHX_ &PL_argvout_stack,
1379 SvREFCNT_inc_simple_NN(PL_defoutgv));
1380 }
1381 }
1382
1383 {
1384 IO * const io = GvIOp(PL_argvoutgv);
1385 if (io && IoIFP(io) && old_out_name) {
1386 do_close(PL_argvoutgv, FALSE);
1387 }
1388 }
1389
1390 PL_lastfd = -1;
1391 PL_filemode = 0;
1392 if (!GvAV(gv))
1393 return NULL;
1394 while (av_count(GvAV(gv)) > 0) {
1395 STRLEN oldlen;
1396 SV *const sv = av_shift(GvAV(gv));
1397 SAVEFREESV(sv);
1398 SvTAINTED_off(GvSVn(gv)); /* previous tainting irrelevant */
1399 sv_setsv(GvSVn(gv),sv);
1400 SvSETMAGIC(GvSV(gv));
1401 PL_oldname = SvPVx(GvSV(gv), oldlen);
1402 if (LIKELY(!PL_inplace)) {
1403 if (nomagicopen
1404 ? do_open6(gv, "<", 1, NULL, &GvSV(gv), 1)
1405 : do_open6(gv, PL_oldname, oldlen, NULL, NULL, 0)
1406 ) {
1407 return IoIFP(GvIOp(gv));
1408 }
1409 }
1410 else {
1411 Stat_t statbuf;
1412 /* This very long block ends with return IoIFP(GvIOp(gv));
1413 Both this block and the block above fall through on open
1414 failure to the warning code, and then the while loop above tries
1415 the next entry. */
1416 if (do_open_raw(gv, PL_oldname, oldlen, O_RDONLY, 0, &statbuf)) {
1417 #ifndef FLEXFILENAMES
1418 int filedev;
1419 int fileino;
1420 #endif
1421 #ifdef ARGV_USE_ATFUNCTIONS
1422 DIR *curdir;
1423 #endif
1424 Uid_t fileuid;
1425 Gid_t filegid;
1426 AV *magic_av = NULL;
1427 SV *temp_name_sv = NULL;
1428 MAGIC *mg;
1429
1430 TAINT_PROPER("inplace open");
1431 if (oldlen == 1 && *PL_oldname == '-') {
1432 setdefout(gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL,
1433 SVt_PVIO));
1434 return IoIFP(GvIOp(gv));
1435 }
1436 #ifndef FLEXFILENAMES
1437 filedev = statbuf.st_dev;
1438 fileino = statbuf.st_ino;
1439 #endif
1440 PL_filemode = statbuf.st_mode;
1441 fileuid = statbuf.st_uid;
1442 filegid = statbuf.st_gid;
1443 if (!S_ISREG(PL_filemode)) {
1444 Perl_ck_warner_d(aTHX_ packWARN(WARN_INPLACE),
1445 "Can't do inplace edit: %s is not a regular file",
1446 PL_oldname );
1447 do_close(gv,FALSE);
1448 continue;
1449 }
1450 magic_av = newAV();
1451 if (*PL_inplace && strNE(PL_inplace, "*")) {
1452 const char *star = strchr(PL_inplace, '*');
1453 if (star) {
1454 const char *begin = PL_inplace;
1455 SvPVCLEAR(sv);
1456 do {
1457 sv_catpvn(sv, begin, star - begin);
1458 sv_catpvn(sv, PL_oldname, oldlen);
1459 begin = ++star;
1460 } while ((star = strchr(begin, '*')));
1461 if (*begin)
1462 sv_catpv(sv,begin);
1463 }
1464 else {
1465 sv_catpv(sv,PL_inplace);
1466 }
1467 #ifndef FLEXFILENAMES
1468 if ((PerlLIO_stat(SvPVX_const(sv),&statbuf) >= 0
1469 && statbuf.st_dev == filedev
1470 && statbuf.st_ino == fileino)
1471 )
1472 {
1473 Perl_ck_warner_d(aTHX_ packWARN(WARN_INPLACE),
1474 "Can't do inplace edit: %"
1475 SVf " would not be unique",
1476 SVfARG(sv));
1477 goto cleanup_argv;
1478 }
1479 #endif
1480 av_store(magic_av, ARGVMG_BACKUP_NAME, newSVsv(sv));
1481 }
1482
1483 sv_setpvn(sv,PL_oldname,oldlen);
1484 SETERRNO(0,0); /* in case sprintf set errno */
1485 temp_name_sv = newSV(0);
1486 if (!S_openindirtemp(aTHX_ PL_argvoutgv, GvSV(gv), temp_name_sv)) {
1487 SvREFCNT_dec(temp_name_sv);
1488 /* diag_listed_as: Can't do inplace edit on %s: %s */
1489 Perl_ck_warner_d(aTHX_ packWARN(WARN_INPLACE), "Can't do inplace edit on %s: Cannot make temp name: %s",
1490 PL_oldname, Strerror(errno) );
1491 #ifndef FLEXFILENAMES
1492 cleanup_argv:
1493 #endif
1494 do_close(gv,FALSE);
1495 SvREFCNT_dec(magic_av);
1496 continue;
1497 }
1498 av_store(magic_av, ARGVMG_TEMP_NAME, temp_name_sv);
1499 av_store(magic_av, ARGVMG_ORIG_NAME, newSVsv(sv));
1500 av_store(magic_av, ARGVMG_ORIG_MODE, newSVuv(PL_filemode));
1501 av_store(magic_av, ARGVMG_ORIG_PID, newSViv((IV)PerlProc_getpid()));
1502 #if defined(ARGV_USE_ATFUNCTIONS)
1503 curdir = opendir(".");
1504 av_store(magic_av, ARGVMG_ORIG_DIRP, newSViv(PTR2IV(curdir)));
1505 #elif defined(ARGV_USE_STAT_INO)
1506 if (PerlLIO_stat(".", &statbuf) >= 0) {
1507 av_store(magic_av, ARGVMG_ORIG_CWD_STAT,
1508 newSVpvn((char *)&statbuf, sizeof(statbuf)));
1509 }
1510 #endif
1511 setdefout(PL_argvoutgv);
1512 sv_setsv(GvSVn(PL_argvoutgv), temp_name_sv);
1513 mg = sv_magicext((SV*)GvIOp(PL_argvoutgv), (SV*)magic_av, PERL_MAGIC_uvar, &argvout_vtbl, NULL, 0);
1514 mg->mg_flags |= MGf_DUP;
1515 SvREFCNT_dec(magic_av);
1516 PL_lastfd = PerlIO_fileno(IoIFP(GvIOp(PL_argvoutgv)));
1517 if (PL_lastfd >= 0) {
1518 (void)PerlLIO_fstat(PL_lastfd,&statbuf);
1519 #ifdef HAS_FCHMOD
1520 (void)fchmod(PL_lastfd,PL_filemode);
1521 #else
1522 (void)PerlLIO_chmod(PL_oldname,PL_filemode);
1523 #endif
1524 if (fileuid != statbuf.st_uid || filegid != statbuf.st_gid) {
1525 /* XXX silently ignore failures */
1526 #ifdef HAS_FCHOWN
1527 PERL_UNUSED_RESULT(fchown(PL_lastfd,fileuid,filegid));
1528 #elif defined(HAS_CHOWN)
1529 PERL_UNUSED_RESULT(PerlLIO_chown(PL_oldname,fileuid,filegid));
1530 #endif
1531 }
1532 }
1533 return IoIFP(GvIOp(gv));
1534 }
1535 } /* successful do_open_raw(), PL_inplace non-NULL */
1536
1537 if (ckWARN_d(WARN_INPLACE)) {
1538 const int eno = errno;
1539 Stat_t statbuf;
1540 if (PerlLIO_stat(PL_oldname, &statbuf) >= 0
1541 && !S_ISREG(statbuf.st_mode)) {
1542 Perl_warner(aTHX_ packWARN(WARN_INPLACE),
1543 "Can't do inplace edit: %s is not a regular file",
1544 PL_oldname);
1545 }
1546 else {
1547 Perl_warner(aTHX_ packWARN(WARN_INPLACE), "Can't open %s: %s",
1548 PL_oldname, Strerror(eno));
1549 }
1550 }
1551 }
1552 if (io && (IoFLAGS(io) & IOf_ARGV))
1553 IoFLAGS(io) |= IOf_START;
1554 if (PL_inplace) {
1555 if (io && (IoFLAGS(io) & IOf_ARGV)
1556 && PL_argvout_stack && AvFILLp(PL_argvout_stack) >= 0)
1557 {
1558 GV * const oldout = MUTABLE_GV(av_pop(PL_argvout_stack));
1559 setdefout(oldout);
1560 SvREFCNT_dec_NN(oldout);
1561 return NULL;
1562 }
1563 setdefout(gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO));
1564 }
1565 return NULL;
1566 }
1567
1568 #ifdef ARGV_USE_ATFUNCTIONS
1569 # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1570
1571 /* FreeBSD 11 renameat() mis-behaves strangely with absolute paths in cases where the
1572 * equivalent rename() succeeds
1573 */
1574 static int
S_my_renameat(int olddfd,const char * oldpath,int newdfd,const char * newpath)1575 S_my_renameat(int olddfd, const char *oldpath, int newdfd, const char *newpath) {
1576 /* this is intended only for use in Perl_do_close() */
1577 assert(olddfd == newdfd);
1578 assert(PERL_FILE_IS_ABSOLUTE(oldpath) == PERL_FILE_IS_ABSOLUTE(newpath));
1579 if (PERL_FILE_IS_ABSOLUTE(oldpath)) {
1580 return PerlLIO_rename(oldpath, newpath);
1581 }
1582 else {
1583 return renameat(olddfd, oldpath, newdfd, newpath);
1584 }
1585 }
1586
1587 # else
1588 # define S_my_renameat(dh1, pv1, dh2, pv2) renameat((dh1), (pv1), (dh2), (pv2))
1589 # endif /* if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) */
1590 #endif
1591
1592 static bool
S_dir_unchanged(pTHX_ const char * orig_pv,MAGIC * mg)1593 S_dir_unchanged(pTHX_ const char *orig_pv, MAGIC *mg) {
1594 Stat_t statbuf;
1595
1596 #ifdef ARGV_USE_STAT_INO
1597 SV **stat_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_CWD_STAT, FALSE);
1598 Stat_t *orig_cwd_stat = stat_psv && *stat_psv ? (Stat_t *)SvPVX(*stat_psv) : NULL;
1599
1600 /* if the path is absolute the possible moving of cwd (which the file
1601 might be in) isn't our problem.
1602 This code tries to be reasonably balanced about detecting a changed
1603 CWD, if we have the information needed to check that curdir has changed, we
1604 check it
1605 */
1606 if (!PERL_FILE_IS_ABSOLUTE(orig_pv)
1607 && orig_cwd_stat
1608 && PerlLIO_stat(".", &statbuf) >= 0
1609 && ( statbuf.st_dev != orig_cwd_stat->st_dev
1610 || statbuf.st_ino != orig_cwd_stat->st_ino)) {
1611 Perl_croak(aTHX_ "Cannot complete in-place edit of %s: %s",
1612 orig_pv, "Current directory has changed");
1613 }
1614 #else
1615 SV **temp_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_TEMP_NAME, FALSE);
1616
1617 /* Some platforms don't have useful st_ino etc, so just
1618 check we can see the work file.
1619 */
1620 if (!PERL_FILE_IS_ABSOLUTE(orig_pv)
1621 && PerlLIO_stat(SvPVX(*temp_psv), &statbuf) < 0) {
1622 Perl_croak(aTHX_ "Cannot complete in-place edit of %s: %s",
1623 orig_pv,
1624 "Work file is missing - did you change directory?");
1625 }
1626 #endif
1627
1628 return TRUE;
1629 }
1630
1631 #define dir_unchanged(orig_psv, mg) \
1632 S_dir_unchanged(aTHX_ (orig_psv), (mg))
1633
1634 STATIC bool
S_argvout_final(pTHX_ MAGIC * mg,IO * io,bool is_explict)1635 S_argvout_final(pTHX_ MAGIC *mg, IO *io, bool is_explict) {
1636 bool retval;
1637
1638 /* ensure args are checked before we start using them */
1639 PERL_ARGS_ASSERT_ARGVOUT_FINAL;
1640
1641 {
1642 /* handle to an in-place edit work file */
1643 SV **back_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_BACKUP_NAME, FALSE);
1644 SV **temp_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_TEMP_NAME, FALSE);
1645 /* PL_oldname may have been modified by a nested ARGV use at this point */
1646 SV **orig_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_NAME, FALSE);
1647 SV **mode_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_MODE, FALSE);
1648 SV **pid_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_PID, FALSE);
1649 #if defined(ARGV_USE_ATFUNCTIONS)
1650 SV **dir_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_DIRP, FALSE);
1651 DIR *dir;
1652 int dfd;
1653 #endif
1654 UV mode;
1655 int fd;
1656
1657 const char *orig_pv;
1658
1659 assert(temp_psv && *temp_psv);
1660 assert(orig_psv && *orig_psv);
1661 assert(mode_psv && *mode_psv);
1662 assert(pid_psv && *pid_psv);
1663 #ifdef ARGV_USE_ATFUNCTIONS
1664 assert(dir_psv && *dir_psv);
1665 dir = INT2PTR(DIR *, SvIVX(*dir_psv));
1666 dfd = my_dirfd(dir);
1667 #endif
1668
1669 orig_pv = SvPVX(*orig_psv);
1670 mode = SvUV(*mode_psv);
1671
1672 if ((mode & (S_ISUID|S_ISGID)) != 0
1673 && (fd = PerlIO_fileno(IoIFP(io))) >= 0) {
1674 (void)PerlIO_flush(IoIFP(io));
1675 #ifdef HAS_FCHMOD
1676 (void)fchmod(fd, mode);
1677 #else
1678 (void)PerlLIO_chmod(orig_pv, mode);
1679 #endif
1680 }
1681
1682 retval = io_close(io, NULL, is_explict, FALSE);
1683
1684 if (SvIV(*pid_psv) != (IV)PerlProc_getpid()) {
1685 /* this is a child process, don't duplicate our rename() etc
1686 processing below */
1687 goto freext;
1688 }
1689
1690 if (retval) {
1691 #if defined(DOSISH) || defined(__CYGWIN__)
1692 if (PL_argvgv && GvIOp(PL_argvgv)
1693 && IoIFP(GvIOp(PL_argvgv))
1694 && (IoFLAGS(GvIOp(PL_argvgv)) & (IOf_ARGV|IOf_START)) == IOf_ARGV) {
1695 do_close(PL_argvgv, FALSE);
1696 }
1697 #endif
1698 #ifndef ARGV_USE_ATFUNCTIONS
1699 if (!dir_unchanged(orig_pv, mg))
1700 goto abort_inplace;
1701 #endif
1702 if (back_psv && *back_psv) {
1703 #if defined(HAS_LINK) && !defined(DOSISH) && !defined(__CYGWIN__) && defined(HAS_RENAME)
1704 if (
1705 # ifdef ARGV_USE_ATFUNCTIONS
1706 linkat(dfd, orig_pv, dfd, SvPVX(*back_psv), 0) < 0 &&
1707 !(UNLIKELY(NotSupported(errno)) &&
1708 dir_unchanged(orig_pv, mg) &&
1709 link(orig_pv, SvPVX(*back_psv)) == 0)
1710 # else
1711 link(orig_pv, SvPVX(*back_psv)) < 0
1712 # endif
1713 )
1714 #endif
1715 {
1716 #ifdef HAS_RENAME
1717 if (
1718 # ifdef ARGV_USE_ATFUNCTIONS
1719 S_my_renameat(dfd, orig_pv, dfd, SvPVX(*back_psv)) < 0 &&
1720 !(UNLIKELY(NotSupported(errno)) &&
1721 dir_unchanged(orig_pv, mg) &&
1722 PerlLIO_rename(orig_pv, SvPVX(*back_psv)) == 0)
1723 # else
1724 PerlLIO_rename(orig_pv, SvPVX(*back_psv)) < 0
1725 # endif
1726 ) {
1727 if (!is_explict) {
1728 # ifdef ARGV_USE_ATFUNCTIONS
1729 if (unlinkat(dfd, SvPVX_const(*temp_psv), 0) < 0 &&
1730 UNLIKELY(NotSupported(errno)) &&
1731 dir_unchanged(orig_pv, mg))
1732 (void)UNLINK(SvPVX_const(*temp_psv));
1733 # else
1734 UNLINK(SvPVX(*temp_psv));
1735 # endif
1736 Perl_croak(aTHX_ "Can't rename %s to %s: %s, skipping file",
1737 SvPVX(*orig_psv), SvPVX(*back_psv), Strerror(errno));
1738 }
1739 /* should we warn here? */
1740 goto abort_inplace;
1741 }
1742 #else
1743 (void)UNLINK(SvPVX(*back_psv));
1744 if (link(orig_pv, SvPVX(*back_psv))) {
1745 if (!is_explict) {
1746 Perl_croak(aTHX_ "Can't rename %s to %s: %s, skipping file",
1747 SvPVX(*orig_psv), SvPVX(*back_psv), Strerror(errno));
1748 }
1749 goto abort_inplace;
1750 }
1751 /* we need to use link() to get the temp into place too, and linK()
1752 fails if the new link name exists */
1753 (void)UNLINK(orig_pv);
1754 #endif
1755 }
1756 }
1757 #if defined(DOSISH) || defined(__CYGWIN__) || !defined(HAS_RENAME)
1758 else {
1759 UNLINK(orig_pv);
1760 }
1761 #endif
1762 if (
1763 #if !defined(HAS_RENAME)
1764 link(SvPVX(*temp_psv), orig_pv) < 0
1765 #elif defined(ARGV_USE_ATFUNCTIONS)
1766 S_my_renameat(dfd, SvPVX(*temp_psv), dfd, orig_pv) < 0 &&
1767 !(UNLIKELY(NotSupported(errno)) &&
1768 dir_unchanged(orig_pv, mg) &&
1769 PerlLIO_rename(SvPVX(*temp_psv), orig_pv) == 0)
1770 #else
1771 PerlLIO_rename(SvPVX(*temp_psv), orig_pv) < 0
1772 #endif
1773 ) {
1774 if (!is_explict) {
1775 #ifdef ARGV_USE_ATFUNCTIONS
1776 if (unlinkat(dfd, SvPVX_const(*temp_psv), 0) < 0 &&
1777 NotSupported(errno))
1778 UNLINK(SvPVX(*temp_psv));
1779 #else
1780 UNLINK(SvPVX(*temp_psv));
1781 #endif
1782 /* diag_listed_as: Cannot complete in-place edit of %s: %s */
1783 Perl_croak(aTHX_ "Cannot complete in-place edit of %s: failed to rename work file '%s' to '%s': %s",
1784 orig_pv, SvPVX(*temp_psv), orig_pv, Strerror(errno));
1785 }
1786 abort_inplace:
1787 UNLINK(SvPVX_const(*temp_psv));
1788 retval = FALSE;
1789 }
1790 #ifndef HAS_RENAME
1791 UNLINK(SvPVX(*temp_psv));
1792 #endif
1793 }
1794 else {
1795 #ifdef ARGV_USE_ATFUNCTIONS
1796 if (unlinkat(dfd, SvPVX_const(*temp_psv), 0) &&
1797 NotSupported(errno))
1798 UNLINK(SvPVX_const(*temp_psv));
1799
1800 #else
1801 UNLINK(SvPVX_const(*temp_psv));
1802 #endif
1803 if (!is_explict) {
1804 Perl_croak(aTHX_ "Failed to close in-place work file %s: %s",
1805 SvPVX(*temp_psv), Strerror(errno));
1806 }
1807 }
1808 freext:
1809 ;
1810 }
1811 return retval;
1812 }
1813
1814 /*
1815 =for apidoc do_close
1816
1817 Close an I/O stream. This implements Perl L<perlfunc/C<close>>.
1818
1819 C<gv> is the glob associated with the stream.
1820
1821 C<is_explict> is C<true> if this is an explicit close of the stream; C<false>
1822 if it is part of another operation, such as closing a pipe (which involves
1823 implicitly closing both ends).
1824
1825 Returns C<true> if successful; otherwise returns C<false> and sets C<errno> to
1826 indicate the cause.
1827
1828 =cut
1829 */
1830
1831 bool
Perl_do_close(pTHX_ GV * gv,bool is_explict)1832 Perl_do_close(pTHX_ GV *gv, bool is_explict)
1833 {
1834 bool retval;
1835 IO *io;
1836 MAGIC *mg;
1837
1838 if (!gv)
1839 gv = PL_argvgv;
1840 if (!gv || !isGV_with_GP(gv)) {
1841 if (is_explict)
1842 SETERRNO(EBADF,SS_IVCHAN);
1843 return FALSE;
1844 }
1845 io = GvIO(gv);
1846 if (!io) { /* never opened */
1847 if (is_explict) {
1848 report_evil_fh(gv);
1849 SETERRNO(EBADF,SS_IVCHAN);
1850 }
1851 return FALSE;
1852 }
1853 if ((mg = mg_findext((SV*)io, PERL_MAGIC_uvar, &argvout_vtbl))
1854 && mg->mg_obj) {
1855 retval = argvout_final(mg, io, is_explict);
1856 mg_freeext((SV*)io, PERL_MAGIC_uvar, &argvout_vtbl);
1857 }
1858 else {
1859 retval = io_close(io, NULL, is_explict, FALSE);
1860 }
1861 if (is_explict) {
1862 IoLINES(io) = 0;
1863 IoPAGE(io) = 0;
1864 IoLINES_LEFT(io) = IoPAGE_LEN(io);
1865 }
1866 IoTYPE(io) = IoTYPE_CLOSED;
1867 return retval;
1868 }
1869
1870 bool
Perl_io_close(pTHX_ IO * io,GV * gv,bool is_explict,bool warn_on_fail)1871 Perl_io_close(pTHX_ IO *io, GV *gv, bool is_explict, bool warn_on_fail)
1872 {
1873 bool retval = FALSE;
1874
1875 PERL_ARGS_ASSERT_IO_CLOSE;
1876
1877 if (IoIFP(io)) {
1878 if (IoTYPE(io) == IoTYPE_PIPE) {
1879 PerlIO *fh = IoIFP(io);
1880 int status;
1881
1882 /* my_pclose() can propagate signals which might bypass any code
1883 after the call here if the signal handler throws an exception.
1884 This would leave the handle in the IO object and try to close it again
1885 when the SV is destroyed on unwind or global destruction.
1886 So NULL it early.
1887 */
1888 IoOFP(io) = IoIFP(io) = NULL;
1889 status = PerlProc_pclose(fh);
1890 if (is_explict) {
1891 STATUS_NATIVE_CHILD_SET(status);
1892 retval = (STATUS_UNIX == 0);
1893 }
1894 else {
1895 retval = (status != -1);
1896 }
1897 }
1898 else if (IoTYPE(io) == IoTYPE_STD)
1899 retval = TRUE;
1900 else {
1901 if (IoOFP(io) && IoOFP(io) != IoIFP(io)) { /* a socket */
1902 const bool prev_err = PerlIO_error(IoOFP(io));
1903 #ifdef USE_PERLIO
1904 if (prev_err)
1905 PerlIO_restore_errno(IoOFP(io));
1906 #endif
1907 retval = (PerlIO_close(IoOFP(io)) != EOF && !prev_err);
1908 PerlIO_close(IoIFP(io)); /* clear stdio, fd already closed */
1909 }
1910 else {
1911 const bool prev_err = PerlIO_error(IoIFP(io));
1912 #ifdef USE_PERLIO
1913 if (prev_err)
1914 PerlIO_restore_errno(IoIFP(io));
1915 #endif
1916 retval = (PerlIO_close(IoIFP(io)) != EOF && !prev_err);
1917 }
1918 }
1919 IoOFP(io) = IoIFP(io) = NULL;
1920
1921 if (warn_on_fail && !retval) {
1922 if (gv)
1923 Perl_ck_warner_d(aTHX_ packWARN(WARN_IO),
1924 "Warning: unable to close filehandle %"
1925 HEKf " properly: %" SVf,
1926 HEKfARG(GvNAME_HEK(gv)),
1927 SVfARG(get_sv("!",GV_ADD)));
1928 else
1929 Perl_ck_warner_d(aTHX_ packWARN(WARN_IO),
1930 "Warning: unable to close filehandle "
1931 "properly: %" SVf,
1932 SVfARG(get_sv("!",GV_ADD)));
1933 }
1934 }
1935 else if (is_explict) {
1936 SETERRNO(EBADF,SS_IVCHAN);
1937 }
1938
1939 return retval;
1940 }
1941
1942 bool
Perl_do_eof(pTHX_ GV * gv)1943 Perl_do_eof(pTHX_ GV *gv)
1944 {
1945 IO * const io = GvIO(gv);
1946
1947 PERL_ARGS_ASSERT_DO_EOF;
1948
1949 if (!io)
1950 return TRUE;
1951 else if (IoTYPE(io) == IoTYPE_WRONLY)
1952 report_wrongway_fh(gv, '>');
1953
1954 while (IoIFP(io)) {
1955 if (PerlIO_has_cntptr(IoIFP(io))) { /* (the code works without this) */
1956 if (PerlIO_get_cnt(IoIFP(io)) > 0) /* cheat a little, since */
1957 return FALSE; /* this is the most usual case */
1958 }
1959
1960 {
1961 /* getc and ungetc can stomp on errno */
1962 dSAVE_ERRNO;
1963 const int ch = PerlIO_getc(IoIFP(io));
1964 if (ch != EOF) {
1965 (void)PerlIO_ungetc(IoIFP(io),ch);
1966 RESTORE_ERRNO;
1967 return FALSE;
1968 }
1969 RESTORE_ERRNO;
1970 }
1971
1972 if (PerlIO_has_cntptr(IoIFP(io)) && PerlIO_canset_cnt(IoIFP(io))) {
1973 if (PerlIO_get_cnt(IoIFP(io)) < -1)
1974 PerlIO_set_cnt(IoIFP(io),-1);
1975 }
1976 if (PL_op->op_flags & OPf_SPECIAL) { /* not necessarily a real EOF yet? */
1977 if (gv != PL_argvgv || !nextargv(gv, FALSE)) /* get another fp handy */
1978 return TRUE;
1979 }
1980 else
1981 return TRUE; /* normal fp, definitely end of file */
1982 }
1983 return TRUE;
1984 }
1985
1986 Off_t
Perl_do_tell(pTHX_ GV * gv)1987 Perl_do_tell(pTHX_ GV *gv)
1988 {
1989 IO *const io = GvIO(gv);
1990 PerlIO *fp;
1991
1992 PERL_ARGS_ASSERT_DO_TELL;
1993
1994 if (io && (fp = IoIFP(io))) {
1995 return PerlIO_tell(fp);
1996 }
1997 report_evil_fh(gv);
1998 SETERRNO(EBADF,RMS_IFI);
1999 return (Off_t)-1;
2000 }
2001
2002 bool
Perl_do_seek(pTHX_ GV * gv,Off_t pos,int whence)2003 Perl_do_seek(pTHX_ GV *gv, Off_t pos, int whence)
2004 {
2005 IO *const io = GvIO(gv);
2006 PerlIO *fp;
2007
2008 if (io && (fp = IoIFP(io))) {
2009 return PerlIO_seek(fp, pos, whence) >= 0;
2010 }
2011 report_evil_fh(gv);
2012 SETERRNO(EBADF,RMS_IFI);
2013 return FALSE;
2014 }
2015
2016 Off_t
Perl_do_sysseek(pTHX_ GV * gv,Off_t pos,int whence)2017 Perl_do_sysseek(pTHX_ GV *gv, Off_t pos, int whence)
2018 {
2019 IO *const io = GvIO(gv);
2020 PerlIO *fp;
2021
2022 PERL_ARGS_ASSERT_DO_SYSSEEK;
2023
2024 if (io && (fp = IoIFP(io))) {
2025 int fd = PerlIO_fileno(fp);
2026 if (fd < 0 || (whence == SEEK_SET && pos < 0)) {
2027 SETERRNO(EINVAL,LIB_INVARG);
2028 return -1;
2029 } else {
2030 return PerlLIO_lseek(fd, pos, whence);
2031 }
2032 }
2033 report_evil_fh(gv);
2034 SETERRNO(EBADF,RMS_IFI);
2035 return (Off_t)-1;
2036 }
2037
2038 int
Perl_mode_from_discipline(pTHX_ const char * s,STRLEN len)2039 Perl_mode_from_discipline(pTHX_ const char *s, STRLEN len)
2040 {
2041 int mode = O_BINARY;
2042 PERL_UNUSED_CONTEXT;
2043 if (s) {
2044 while (*s) {
2045 if (*s == ':') {
2046 switch (s[1]) {
2047 case 'r':
2048 if (s[2] == 'a' && s[3] == 'w'
2049 && (!s[4] || s[4] == ':' || isSPACE(s[4])))
2050 {
2051 mode = O_BINARY;
2052 s += 4;
2053 len -= 4;
2054 break;
2055 }
2056 /* FALLTHROUGH */
2057 case 'c':
2058 if (s[2] == 'r' && s[3] == 'l' && s[4] == 'f'
2059 && (!s[5] || s[5] == ':' || isSPACE(s[5])))
2060 {
2061 mode = O_TEXT;
2062 s += 5;
2063 len -= 5;
2064 break;
2065 }
2066 /* FALLTHROUGH */
2067 default:
2068 goto fail_discipline;
2069 }
2070 }
2071 else if (isSPACE(*s)) {
2072 ++s;
2073 --len;
2074 }
2075 else {
2076 const char *end;
2077 fail_discipline:
2078 end = (char *) memchr(s+1, ':', len);
2079 if (!end)
2080 end = s+len;
2081 #ifndef PERLIO_LAYERS
2082 Perl_croak(aTHX_ "IO layers (like '%.*s') unavailable", end-s, s);
2083 #else
2084 len -= end-s;
2085 s = end;
2086 #endif
2087 }
2088 }
2089 }
2090 return mode;
2091 }
2092
2093 /*
2094 =for apidoc my_chsize
2095
2096 The C library L<chsize(3)> if available, or a Perl implementation of it.
2097
2098 =cut
2099 */
2100
2101 #if !defined(HAS_TRUNCATE) && !defined(HAS_CHSIZE)
2102 I32
my_chsize(int fd,Off_t length)2103 my_chsize(int fd, Off_t length)
2104 {
2105 # ifdef F_FREESP
2106 /* code courtesy of William Kucharski */
2107 # define HAS_CHSIZE
2108
2109 Stat_t filebuf;
2110
2111 if (PerlLIO_fstat(fd, &filebuf) < 0)
2112 return -1;
2113
2114 if (filebuf.st_size < length) {
2115
2116 /* extend file length */
2117
2118 if ((PerlLIO_lseek(fd, (length - 1), 0)) < 0)
2119 return -1;
2120
2121 /* write a "0" byte */
2122
2123 if ((PerlLIO_write(fd, "", 1)) != 1)
2124 return -1;
2125 }
2126 else {
2127 /* truncate length */
2128 struct flock fl;
2129 fl.l_whence = 0;
2130 fl.l_len = 0;
2131 fl.l_start = length;
2132 fl.l_type = F_WRLCK; /* write lock on file space */
2133
2134 /*
2135 * This relies on the UNDOCUMENTED F_FREESP argument to
2136 * fcntl(2), which truncates the file so that it ends at the
2137 * position indicated by fl.l_start.
2138 *
2139 * Will minor miracles never cease?
2140 */
2141
2142 if (fcntl(fd, F_FREESP, &fl) < 0)
2143 return -1;
2144
2145 }
2146 return 0;
2147 # else
2148 Perl_croak_nocontext("truncate not implemented");
2149 # endif /* F_FREESP */
2150 return -1;
2151 }
2152 #endif /* !HAS_TRUNCATE && !HAS_CHSIZE */
2153
2154 bool
Perl_do_print(pTHX_ SV * sv,PerlIO * fp)2155 Perl_do_print(pTHX_ SV *sv, PerlIO *fp)
2156 {
2157 PERL_ARGS_ASSERT_DO_PRINT;
2158
2159 /* assuming fp is checked earlier */
2160 if (!sv)
2161 return TRUE;
2162 if (SvTYPE(sv) == SVt_IV && SvIOK(sv)) {
2163 assert(!SvGMAGICAL(sv));
2164 if (SvIsUV(sv))
2165 PerlIO_printf(fp, "%" UVuf, (UV)SvUVX(sv));
2166 else
2167 PerlIO_printf(fp, "%" IVdf, (IV)SvIVX(sv));
2168 return !PerlIO_error(fp);
2169 }
2170 else {
2171 STRLEN len;
2172 /* Do this first to trigger any overloading. */
2173 const char *tmps = SvPV_const(sv, len);
2174 U8 *tmpbuf = NULL;
2175 bool happy = TRUE;
2176
2177 if (PerlIO_isutf8(fp)) { /* If the stream is utf8 ... */
2178 if (!SvUTF8(sv)) { /* Convert to utf8 if necessary */
2179 /* We don't modify the original scalar. */
2180 tmpbuf = bytes_to_utf8((const U8*) tmps, &len);
2181 tmps = (char *) tmpbuf;
2182 }
2183 else if (ckWARN4_d(WARN_UTF8, WARN_SURROGATE, WARN_NON_UNICODE, WARN_NONCHAR)) {
2184 (void) check_utf8_print((const U8*) tmps, len);
2185 }
2186 } /* else stream isn't utf8 */
2187 else if (DO_UTF8(sv)) { /* But if is utf8 internally, attempt to
2188 convert to bytes */
2189 STRLEN tmplen = len;
2190 bool utf8 = TRUE;
2191 U8 * const result = bytes_from_utf8((const U8*) tmps, &tmplen, &utf8);
2192 if (!utf8) {
2193
2194 /* Here, succeeded in downgrading from utf8. Set up to below
2195 * output the converted value */
2196 tmpbuf = result;
2197 tmps = (char *) tmpbuf;
2198 len = tmplen;
2199 }
2200 else { /* Non-utf8 output stream, but string only representable in
2201 utf8 */
2202 assert((char *)result == tmps);
2203 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8),
2204 "Wide character in %s",
2205 PL_op ? OP_DESC(PL_op) : "print"
2206 );
2207 /* Could also check that isn't one of the things to avoid
2208 * in utf8 by using check_utf8_print(), but not doing so,
2209 * since the stream isn't a UTF8 stream */
2210 }
2211 }
2212 /* To detect whether the process is about to overstep its
2213 * filesize limit we would need getrlimit(). We could then
2214 * also transparently raise the limit with setrlimit() --
2215 * but only until the system hard limit/the filesystem limit,
2216 * at which we would get EPERM. Note that when using buffered
2217 * io the write failure can be delayed until the flush/close. --jhi */
2218 if (len && (PerlIO_write(fp,tmps,len) == 0))
2219 happy = FALSE;
2220 Safefree(tmpbuf);
2221 return happy ? !PerlIO_error(fp) : FALSE;
2222 }
2223 }
2224
2225 I32
Perl_my_stat_flags(pTHX_ const U32 flags)2226 Perl_my_stat_flags(pTHX_ const U32 flags)
2227 {
2228 dSP;
2229 IO *io;
2230 GV* gv;
2231
2232 if (PL_op->op_flags & OPf_REF) {
2233 gv = cGVOP_gv;
2234 do_fstat:
2235 if (gv == PL_defgv) {
2236 if (PL_laststatval < 0)
2237 SETERRNO(EBADF,RMS_IFI);
2238 return PL_laststatval;
2239 }
2240 io = GvIO(gv);
2241 do_fstat_have_io:
2242 PL_laststype = OP_STAT;
2243 PL_statgv = gv ? gv : (GV *)io;
2244 SvPVCLEAR(PL_statname);
2245 if (io) {
2246 if (IoIFP(io)) {
2247 int fd = PerlIO_fileno(IoIFP(io));
2248 if (fd < 0) {
2249 /* E.g. PerlIO::scalar has no real fd. */
2250 SETERRNO(EBADF,RMS_IFI);
2251 return (PL_laststatval = -1);
2252 } else {
2253 return (PL_laststatval = PerlLIO_fstat(fd, &PL_statcache));
2254 }
2255 } else if (IoDIRP(io)) {
2256 return (PL_laststatval = PerlLIO_fstat(my_dirfd(IoDIRP(io)), &PL_statcache));
2257 }
2258 }
2259 PL_laststatval = -1;
2260 report_evil_fh(gv);
2261 SETERRNO(EBADF,RMS_IFI);
2262 return -1;
2263 }
2264 else if ((PL_op->op_private & (OPpFT_STACKED|OPpFT_AFTER_t))
2265 == OPpFT_STACKED)
2266 return PL_laststatval;
2267 else {
2268 SV* const sv = TOPs;
2269 const char *s, *d;
2270 STRLEN len;
2271 if ((gv = MAYBE_DEREF_GV_flags(sv,flags))) {
2272 goto do_fstat;
2273 }
2274 else if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVIO) {
2275 io = MUTABLE_IO(SvRV(sv));
2276 gv = NULL;
2277 goto do_fstat_have_io;
2278 }
2279
2280 s = SvPV_flags_const(sv, len, flags);
2281 PL_statgv = NULL;
2282 sv_setpvn(PL_statname, s, len);
2283 d = SvPVX_const(PL_statname); /* s now NUL-terminated */
2284 PL_laststype = OP_STAT;
2285 if (!IS_SAFE_PATHNAME(s, len, OP_NAME(PL_op))) {
2286 PL_laststatval = -1;
2287 }
2288 else {
2289 PL_laststatval = PerlLIO_stat(d, &PL_statcache);
2290 }
2291 if (PL_laststatval < 0 && ckWARN(WARN_NEWLINE) && should_warn_nl(s)) {
2292 GCC_DIAG_IGNORE_STMT(-Wformat-nonliteral); /* PL_warn_nl is constant */
2293 Perl_warner(aTHX_ packWARN(WARN_NEWLINE), PL_warn_nl, "stat");
2294 GCC_DIAG_RESTORE_STMT;
2295 }
2296 return PL_laststatval;
2297 }
2298 }
2299
2300
2301 I32
Perl_my_lstat_flags(pTHX_ const U32 flags)2302 Perl_my_lstat_flags(pTHX_ const U32 flags)
2303 {
2304 static const char* const no_prev_lstat = "The stat preceding -l _ wasn't an lstat";
2305 dSP;
2306 const char *file;
2307 STRLEN len;
2308 SV* const sv = TOPs;
2309 bool isio = FALSE;
2310 if (PL_op->op_flags & OPf_REF) {
2311 if (cGVOP_gv == PL_defgv) {
2312 if (PL_laststype != OP_LSTAT)
2313 Perl_croak(aTHX_ "%s", no_prev_lstat);
2314 if (PL_laststatval < 0)
2315 SETERRNO(EBADF,RMS_IFI);
2316 return PL_laststatval;
2317 }
2318 PL_laststatval = -1;
2319 if (ckWARN(WARN_IO)) {
2320 /* diag_listed_as: Use of -l on filehandle%s */
2321 Perl_warner(aTHX_ packWARN(WARN_IO),
2322 "Use of -l on filehandle %" HEKf,
2323 HEKfARG(GvENAME_HEK(cGVOP_gv)));
2324 }
2325 SETERRNO(EBADF,RMS_IFI);
2326 return -1;
2327 }
2328 if ((PL_op->op_private & (OPpFT_STACKED|OPpFT_AFTER_t))
2329 == OPpFT_STACKED) {
2330 if (PL_laststype != OP_LSTAT)
2331 Perl_croak(aTHX_ "%s", no_prev_lstat);
2332 return PL_laststatval;
2333 }
2334
2335 PL_laststype = OP_LSTAT;
2336 PL_statgv = NULL;
2337 if ( ( (SvROK(sv) && ( isGV_with_GP(SvRV(sv))
2338 || (isio = SvTYPE(SvRV(sv)) == SVt_PVIO) )
2339 )
2340 || isGV_with_GP(sv)
2341 )
2342 && ckWARN(WARN_IO)) {
2343 if (isio)
2344 /* diag_listed_as: Use of -l on filehandle%s */
2345 Perl_warner(aTHX_ packWARN(WARN_IO),
2346 "Use of -l on filehandle");
2347 else
2348 /* diag_listed_as: Use of -l on filehandle%s */
2349 Perl_warner(aTHX_ packWARN(WARN_IO),
2350 "Use of -l on filehandle %" HEKf,
2351 HEKfARG(GvENAME_HEK((const GV *)
2352 (SvROK(sv) ? SvRV(sv) : sv))));
2353 }
2354 file = SvPV_flags_const(sv, len, flags);
2355 sv_setpv(PL_statname,file);
2356 if (!IS_SAFE_PATHNAME(file, len, OP_NAME(PL_op))) {
2357 PL_laststatval = -1;
2358 }
2359 else {
2360 PL_laststatval = PerlLIO_lstat(file,&PL_statcache);
2361 }
2362 if (PL_laststatval < 0 && ckWARN(WARN_NEWLINE) && should_warn_nl(file)) {
2363 GCC_DIAG_IGNORE_STMT(-Wformat-nonliteral); /* PL_warn_nl is constant */
2364 Perl_warner(aTHX_ packWARN(WARN_NEWLINE), PL_warn_nl, "lstat");
2365 GCC_DIAG_RESTORE_STMT;
2366 }
2367 return PL_laststatval;
2368 }
2369
2370 static void
S_exec_failed(pTHX_ const char * cmd,int fd,int do_report)2371 S_exec_failed(pTHX_ const char *cmd, int fd, int do_report)
2372 {
2373 const int e = errno;
2374 PERL_ARGS_ASSERT_EXEC_FAILED;
2375
2376 if (ckWARN(WARN_EXEC))
2377 Perl_warner(aTHX_ packWARN(WARN_EXEC), "Can't exec \"%s\": %s",
2378 cmd, Strerror(e));
2379 if (do_report) {
2380 /* XXX silently ignore failures */
2381 PERL_UNUSED_RESULT(PerlLIO_write(fd, (void*)&e, sizeof(int)));
2382 PerlLIO_close(fd);
2383 }
2384 }
2385
2386 bool
Perl_do_aexec5(pTHX_ SV * really,SV ** mark,SV ** sp,int fd,int do_report)2387 Perl_do_aexec5(pTHX_ SV *really, SV **mark, SV **sp,
2388 int fd, int do_report)
2389 {
2390 PERL_ARGS_ASSERT_DO_AEXEC5;
2391 #if defined(__LIBCATAMOUNT__)
2392 Perl_croak(aTHX_ "exec? I'm not *that* kind of operating system");
2393 #else
2394 assert(sp >= mark);
2395 ENTER;
2396 {
2397 const char **argv, **a;
2398 const char *tmps = NULL;
2399 Newx(argv, sp - mark + 1, const char*);
2400 SAVEFREEPV(argv);
2401 a = argv;
2402
2403 while (++mark <= sp) {
2404 if (*mark) {
2405 char *arg = savepv(SvPV_nolen_const(*mark));
2406 SAVEFREEPV(arg);
2407 *a++ = arg;
2408 } else
2409 *a++ = "";
2410 }
2411 *a = NULL;
2412 if (really) {
2413 tmps = savepv(SvPV_nolen_const(really));
2414 SAVEFREEPV(tmps);
2415 }
2416 if ((!really && argv[0] && *argv[0] != '/') ||
2417 (really && *tmps != '/')) /* will execvp use PATH? */
2418 TAINT_ENV(); /* testing IFS here is overkill, probably */
2419 PERL_FPU_PRE_EXEC
2420 if (really && *tmps) {
2421 PerlProc_execvp(tmps,EXEC_ARGV_CAST(argv));
2422 } else if (argv[0]) {
2423 PerlProc_execvp(argv[0],EXEC_ARGV_CAST(argv));
2424 } else {
2425 SETERRNO(ENOENT,RMS_FNF);
2426 }
2427 PERL_FPU_POST_EXEC
2428 S_exec_failed(aTHX_ (really ? tmps : argv[0] ? argv[0] : ""), fd, do_report);
2429 }
2430 LEAVE;
2431 #endif
2432 return FALSE;
2433 }
2434
2435 #ifdef PERL_DEFAULT_DO_EXEC3_IMPLEMENTATION
2436
2437 bool
Perl_do_exec3(pTHX_ const char * incmd,int fd,int do_report)2438 Perl_do_exec3(pTHX_ const char *incmd, int fd, int do_report)
2439 {
2440 const char **argv, **a;
2441 char *s;
2442 char *buf;
2443 char *cmd;
2444 /* Make a copy so we can change it */
2445 const Size_t cmdlen = strlen(incmd) + 1;
2446
2447 PERL_ARGS_ASSERT_DO_EXEC3;
2448
2449 ENTER;
2450 Newx(buf, cmdlen, char);
2451 SAVEFREEPV(buf);
2452 cmd = buf;
2453 memcpy(cmd, incmd, cmdlen);
2454
2455 while (*cmd && isSPACE(*cmd))
2456 cmd++;
2457
2458 /* save an extra exec if possible */
2459
2460 #ifdef CSH
2461 {
2462 char flags[PERL_FLAGS_MAX];
2463 if (strnEQ(cmd,PL_cshname,PL_cshlen) &&
2464 strBEGINs(cmd+PL_cshlen," -c")) {
2465 my_strlcpy(flags, "-c", PERL_FLAGS_MAX);
2466 s = cmd+PL_cshlen+3;
2467 if (*s == 'f') {
2468 s++;
2469 my_strlcat(flags, "f", PERL_FLAGS_MAX - 2);
2470 }
2471 if (*s == ' ')
2472 s++;
2473 if (*s++ == '\'') {
2474 char * const ncmd = s;
2475
2476 while (*s)
2477 s++;
2478 if (s[-1] == '\n')
2479 *--s = '\0';
2480 if (s[-1] == '\'') {
2481 *--s = '\0';
2482 PERL_FPU_PRE_EXEC
2483 PerlProc_execl(PL_cshname, "csh", flags, ncmd, (char*)NULL);
2484 PERL_FPU_POST_EXEC
2485 *s = '\'';
2486 S_exec_failed(aTHX_ PL_cshname, fd, do_report);
2487 goto leave;
2488 }
2489 }
2490 }
2491 }
2492 #endif /* CSH */
2493
2494 /* see if there are shell metacharacters in it */
2495
2496 if (*cmd == '.' && isSPACE(cmd[1]))
2497 goto doshell;
2498
2499 if (strBEGINs(cmd,"exec") && isSPACE(cmd[4]))
2500 goto doshell;
2501
2502 s = cmd;
2503 while (isWORDCHAR(*s))
2504 s++; /* catch VAR=val gizmo */
2505 if (*s == '=')
2506 goto doshell;
2507
2508 for (s = cmd; *s; s++) {
2509 if (*s != ' ' && !isALPHA(*s) &&
2510 memCHRs("$&*(){}[]'\";\\|?<>~`\n",*s)) {
2511 if (*s == '\n' && !s[1]) {
2512 *s = '\0';
2513 break;
2514 }
2515 /* handle the 2>&1 construct at the end */
2516 if (*s == '>' && s[1] == '&' && s[2] == '1'
2517 && s > cmd + 1 && s[-1] == '2' && isSPACE(s[-2])
2518 && (!s[3] || isSPACE(s[3])))
2519 {
2520 const char *t = s + 3;
2521
2522 while (*t && isSPACE(*t))
2523 ++t;
2524 if (!*t && (PerlLIO_dup2(1,2) != -1)) {
2525 s[-2] = '\0';
2526 break;
2527 }
2528 }
2529 doshell:
2530 PERL_FPU_PRE_EXEC
2531 PerlProc_execl(PL_sh_path, "sh", "-c", cmd, (char *)NULL);
2532 PERL_FPU_POST_EXEC
2533 S_exec_failed(aTHX_ PL_sh_path, fd, do_report);
2534 goto leave;
2535 }
2536 }
2537
2538 Newx(argv, (s - cmd) / 2 + 2, const char*);
2539 SAVEFREEPV(argv);
2540 cmd = savepvn(cmd, s-cmd);
2541 SAVEFREEPV(cmd);
2542 a = argv;
2543 for (s = cmd; *s;) {
2544 while (isSPACE(*s))
2545 s++;
2546 if (*s)
2547 *(a++) = s;
2548 while (*s && !isSPACE(*s))
2549 s++;
2550 if (*s)
2551 *s++ = '\0';
2552 }
2553 *a = NULL;
2554 if (argv[0]) {
2555 PERL_FPU_PRE_EXEC
2556 PerlProc_execvp(argv[0],EXEC_ARGV_CAST(argv));
2557 PERL_FPU_POST_EXEC
2558 if (errno == ENOEXEC) /* for system V NIH syndrome */
2559 goto doshell;
2560 S_exec_failed(aTHX_ argv[0], fd, do_report);
2561 }
2562 leave:
2563 LEAVE;
2564 return FALSE;
2565 }
2566
2567 #endif /* OS2 || WIN32 */
2568
2569 I32
Perl_apply(pTHX_ I32 type,SV ** mark,SV ** sp)2570 Perl_apply(pTHX_ I32 type, SV **mark, SV **sp)
2571 {
2572 I32 val;
2573 I32 tot = 0;
2574 const char *const what = PL_op_name[type];
2575 const char *s;
2576 STRLEN len;
2577 SV ** const oldmark = mark;
2578 bool killgp = FALSE;
2579
2580 PERL_ARGS_ASSERT_APPLY;
2581
2582 PERL_UNUSED_VAR(what); /* may not be used depending on compile options */
2583
2584 /* Doing this ahead of the switch statement preserves the old behaviour,
2585 where attempting to use kill as a taint test would fail on
2586 platforms where kill was not defined. */
2587 #ifndef HAS_KILL
2588 if (type == OP_KILL)
2589 Perl_die(aTHX_ PL_no_func, what);
2590 #endif
2591 #ifndef HAS_CHOWN
2592 if (type == OP_CHOWN)
2593 Perl_die(aTHX_ PL_no_func, what);
2594 #endif
2595
2596
2597 #define APPLY_TAINT_PROPER() \
2598 STMT_START { \
2599 if (TAINT_get) { TAINT_PROPER(what); } \
2600 } STMT_END
2601
2602 /* This is a first heuristic; it doesn't catch tainting magic. */
2603 if (TAINTING_get) {
2604 while (++mark <= sp) {
2605 if (SvTAINTED(*mark)) {
2606 TAINT;
2607 break;
2608 }
2609 }
2610 mark = oldmark;
2611 }
2612 switch (type) {
2613 case OP_CHMOD:
2614 APPLY_TAINT_PROPER();
2615 if (++mark <= sp) {
2616 val = SvIV(*mark);
2617 APPLY_TAINT_PROPER();
2618 tot = sp - mark;
2619 while (++mark <= sp) {
2620 GV* gv;
2621 if ((gv = MAYBE_DEREF_GV(*mark))) {
2622 if (GvIO(gv) && IoIFP(GvIOp(gv))) {
2623 #ifdef HAS_FCHMOD
2624 int fd = PerlIO_fileno(IoIFP(GvIOn(gv)));
2625 APPLY_TAINT_PROPER();
2626 if (fd < 0) {
2627 SETERRNO(EBADF,RMS_IFI);
2628 tot--;
2629 } else if (fchmod(fd, val))
2630 tot--;
2631 #else
2632 Perl_die(aTHX_ PL_no_func, "fchmod");
2633 #endif
2634 }
2635 else {
2636 SETERRNO(EBADF,RMS_IFI);
2637 tot--;
2638 }
2639 }
2640 else {
2641 const char *name = SvPV_nomg_const(*mark, len);
2642 APPLY_TAINT_PROPER();
2643 if (!IS_SAFE_PATHNAME(name, len, "chmod") ||
2644 PerlLIO_chmod(name, val)) {
2645 tot--;
2646 }
2647 }
2648 }
2649 }
2650 break;
2651 #ifdef HAS_CHOWN
2652 case OP_CHOWN:
2653 APPLY_TAINT_PROPER();
2654 if (sp - mark > 2) {
2655 I32 val2;
2656 val = SvIVx(*++mark);
2657 val2 = SvIVx(*++mark);
2658 APPLY_TAINT_PROPER();
2659 tot = sp - mark;
2660 while (++mark <= sp) {
2661 GV* gv;
2662 if ((gv = MAYBE_DEREF_GV(*mark))) {
2663 if (GvIO(gv) && IoIFP(GvIOp(gv))) {
2664 #ifdef HAS_FCHOWN
2665 int fd = PerlIO_fileno(IoIFP(GvIOn(gv)));
2666 APPLY_TAINT_PROPER();
2667 if (fd < 0) {
2668 SETERRNO(EBADF,RMS_IFI);
2669 tot--;
2670 } else if (fchown(fd, val, val2))
2671 tot--;
2672 #else
2673 Perl_die(aTHX_ PL_no_func, "fchown");
2674 #endif
2675 }
2676 else {
2677 SETERRNO(EBADF,RMS_IFI);
2678 tot--;
2679 }
2680 }
2681 else {
2682 const char *name = SvPV_nomg_const(*mark, len);
2683 APPLY_TAINT_PROPER();
2684 if (!IS_SAFE_PATHNAME(name, len, "chown") ||
2685 PerlLIO_chown(name, val, val2)) {
2686 tot--;
2687 }
2688 }
2689 }
2690 }
2691 break;
2692 #endif
2693 /*
2694 XXX Should we make lchown() directly available from perl?
2695 For now, we'll let Configure test for HAS_LCHOWN, but do
2696 nothing in the core.
2697 --AD 5/1998
2698 */
2699 #ifdef HAS_KILL
2700 case OP_KILL:
2701 APPLY_TAINT_PROPER();
2702 if (mark == sp)
2703 break;
2704 s = SvPVx_const(*++mark, len);
2705 if (*s == '-' && isALPHA(s[1]))
2706 {
2707 s++;
2708 len--;
2709 killgp = TRUE;
2710 }
2711 if (isALPHA(*s)) {
2712 if (*s == 'S' && s[1] == 'I' && s[2] == 'G') {
2713 s += 3;
2714 len -= 3;
2715 }
2716 if ((val = whichsig_pvn(s, len)) < 0)
2717 Perl_croak(aTHX_ "Unrecognized signal name \"%" SVf "\"",
2718 SVfARG(*mark));
2719 }
2720 else
2721 {
2722 val = SvIV(*mark);
2723 if (val < 0)
2724 {
2725 killgp = TRUE;
2726 val = -val;
2727 }
2728 }
2729 APPLY_TAINT_PROPER();
2730 tot = sp - mark;
2731
2732 while (++mark <= sp) {
2733 Pid_t proc;
2734 SvGETMAGIC(*mark);
2735 if (!(SvNIOK(*mark) || looks_like_number(*mark)))
2736 Perl_croak(aTHX_ "Can't kill a non-numeric process ID");
2737 proc = SvIV_nomg(*mark);
2738 APPLY_TAINT_PROPER();
2739 #ifdef HAS_KILLPG
2740 /* use killpg in preference, as the killpg() wrapper for Win32
2741 * understands process groups, but the kill() wrapper doesn't */
2742 if (killgp ? PerlProc_killpg(proc, val)
2743 : PerlProc_kill(proc, val))
2744 #else
2745 if (PerlProc_kill(killgp ? -proc: proc, val))
2746 #endif
2747 tot--;
2748 }
2749 PERL_ASYNC_CHECK();
2750 break;
2751 #endif
2752 case OP_UNLINK:
2753 APPLY_TAINT_PROPER();
2754 tot = sp - mark;
2755 while (++mark <= sp) {
2756 s = SvPV_const(*mark, len);
2757 APPLY_TAINT_PROPER();
2758 if (!IS_SAFE_PATHNAME(s, len, "unlink")) {
2759 tot--;
2760 }
2761 else if (PL_unsafe) {
2762 if (UNLINK(s))
2763 {
2764 tot--;
2765 }
2766 #if defined(__amigaos4__) && defined(NEWLIB)
2767 else
2768 {
2769 /* Under AmigaOS4 unlink only 'fails' if the
2770 * filename is invalid. It may not remove the file
2771 * if it's locked, so check if it's still around. */
2772 if ((access(s,F_OK) != -1))
2773 {
2774 tot--;
2775 }
2776 }
2777 #endif
2778 }
2779 else { /* don't let root wipe out directories without -U */
2780 Stat_t statbuf;
2781 if (PerlLIO_lstat(s, &statbuf) < 0)
2782 tot--;
2783 else if (S_ISDIR(statbuf.st_mode)) {
2784 SETERRNO(EISDIR, SS_NOPRIV);
2785 tot--;
2786 }
2787 else {
2788 if (UNLINK(s))
2789 {
2790 tot--;
2791 }
2792 #if defined(__amigaos4__) && defined(NEWLIB)
2793 else
2794 {
2795 /* Under AmigaOS4 unlink only 'fails' if the filename is invalid */
2796 /* It may not remove the file if it's Locked, so check if it's still */
2797 /* around */
2798 if((access(s,F_OK) != -1))
2799 {
2800 tot--;
2801 }
2802 }
2803 #endif
2804 }
2805 }
2806 }
2807 break;
2808 #if defined(HAS_UTIME) || defined(HAS_FUTIMES)
2809 case OP_UTIME:
2810 APPLY_TAINT_PROPER();
2811 if (sp - mark > 2) {
2812 #if defined(HAS_FUTIMES)
2813 struct timeval utbuf[2];
2814 void *utbufp = utbuf;
2815 #elif defined(I_UTIME) || defined(VMS)
2816 struct utimbuf utbuf;
2817 struct utimbuf *utbufp = &utbuf;
2818 #else
2819 struct {
2820 Time_t actime;
2821 Time_t modtime;
2822 } utbuf;
2823 void *utbufp = &utbuf;
2824 #endif
2825
2826 SV* const accessed = *++mark;
2827 SV* const modified = *++mark;
2828
2829 /* Be like C, and if both times are undefined, let the C
2830 * library figure out what to do. This usually means
2831 * "current time". */
2832
2833 if ( accessed == &PL_sv_undef && modified == &PL_sv_undef )
2834 utbufp = NULL;
2835 else {
2836 Zero(&utbuf, sizeof utbuf, char);
2837 #ifdef HAS_FUTIMES
2838 utbuf[0].tv_sec = (long)SvIV(accessed); /* time accessed */
2839 utbuf[0].tv_usec = 0;
2840 utbuf[1].tv_sec = (long)SvIV(modified); /* time modified */
2841 utbuf[1].tv_usec = 0;
2842 #elif defined(BIG_TIME)
2843 utbuf.actime = (Time_t)SvNV(accessed); /* time accessed */
2844 utbuf.modtime = (Time_t)SvNV(modified); /* time modified */
2845 #else
2846 utbuf.actime = (Time_t)SvIV(accessed); /* time accessed */
2847 utbuf.modtime = (Time_t)SvIV(modified); /* time modified */
2848 #endif
2849 }
2850 APPLY_TAINT_PROPER();
2851 tot = sp - mark;
2852 while (++mark <= sp) {
2853 GV* gv;
2854 if ((gv = MAYBE_DEREF_GV(*mark))) {
2855 if (GvIO(gv) && IoIFP(GvIOp(gv))) {
2856 #ifdef HAS_FUTIMES
2857 int fd = PerlIO_fileno(IoIFP(GvIOn(gv)));
2858 APPLY_TAINT_PROPER();
2859 if (fd < 0) {
2860 SETERRNO(EBADF,RMS_IFI);
2861 tot--;
2862 } else if (futimes(fd, (struct timeval *) utbufp))
2863 tot--;
2864 #else
2865 Perl_die(aTHX_ PL_no_func, "futimes");
2866 #endif
2867 }
2868 else {
2869 SETERRNO(EBADF,RMS_IFI);
2870 tot--;
2871 }
2872 }
2873 else {
2874 const char * const name = SvPV_nomg_const(*mark, len);
2875 APPLY_TAINT_PROPER();
2876 if (!IS_SAFE_PATHNAME(name, len, "utime")) {
2877 tot--;
2878 }
2879 else
2880 #ifdef HAS_FUTIMES
2881 if (utimes(name, (struct timeval *)utbufp))
2882 #else
2883 if (PerlLIO_utime(name, utbufp))
2884 #endif
2885 tot--;
2886 }
2887
2888 }
2889 }
2890 else
2891 tot = 0;
2892 break;
2893 #endif
2894 }
2895 return tot;
2896
2897 #undef APPLY_TAINT_PROPER
2898 }
2899
2900 /* Do the permissions in *statbufp allow some operation? */
2901 #ifndef VMS /* VMS' cando is in vms.c */
2902 bool
Perl_cando(pTHX_ Mode_t mode,bool effective,const Stat_t * statbufp)2903 Perl_cando(pTHX_ Mode_t mode, bool effective, const Stat_t *statbufp)
2904 /* effective is a flag, true for EUID, or for checking if the effective gid
2905 * is in the list of groups returned from getgroups().
2906 */
2907 {
2908 PERL_ARGS_ASSERT_CANDO;
2909 PERL_UNUSED_CONTEXT;
2910
2911 #ifdef DOSISH
2912 /* [Comments and code from Len Reed]
2913 * MS-DOS "user" is similar to UNIX's "superuser," but can't write
2914 * to write-protected files. The execute permission bit is set
2915 * by the Microsoft C library stat() function for the following:
2916 * .exe files
2917 * .com files
2918 * .bat files
2919 * directories
2920 * All files and directories are readable.
2921 * Directories and special files, e.g. "CON", cannot be
2922 * write-protected.
2923 * [Comment by Tom Dinger -- a directory can have the write-protect
2924 * bit set in the file system, but DOS permits changes to
2925 * the directory anyway. In addition, all bets are off
2926 * here for networked software, such as Novell and
2927 * Sun's PC-NFS.]
2928 */
2929
2930 /* Atari stat() does pretty much the same thing. we set x_bit_set_in_stat
2931 * too so it will actually look into the files for magic numbers
2932 */
2933 return cBOOL(mode & statbufp->st_mode);
2934
2935 #else /* ! DOSISH */
2936 # ifdef __CYGWIN__
2937 if (ingroup(544,effective)) { /* member of Administrators */
2938 # else
2939 if ((effective ? PerlProc_geteuid() : PerlProc_getuid()) == 0) { /* root is special */
2940 # endif
2941 if (mode == S_IXUSR) {
2942 if (statbufp->st_mode & 0111 || S_ISDIR(statbufp->st_mode))
2943 return TRUE;
2944 }
2945 else
2946 return TRUE; /* root reads and writes anything */
2947 return FALSE;
2948 }
2949 if (statbufp->st_uid == (effective ? PerlProc_geteuid() : PerlProc_getuid()) ) {
2950 if (statbufp->st_mode & mode)
2951 return TRUE; /* ok as "user" */
2952 }
2953 else if (ingroup(statbufp->st_gid,effective)) {
2954 if (statbufp->st_mode & mode >> 3)
2955 return TRUE; /* ok as "group" */
2956 }
2957 else if (statbufp->st_mode & mode >> 6)
2958 return TRUE; /* ok as "other" */
2959 return FALSE;
2960 #endif /* ! DOSISH */
2961 }
2962 #endif /* ! VMS */
2963
2964 static bool
2965 S_ingroup(pTHX_ Gid_t testgid, bool effective)
2966 {
2967 #ifndef PERL_IMPLICIT_SYS
2968 /* PERL_IMPLICIT_SYS like Win32: getegid() etc. require the context. */
2969 PERL_UNUSED_CONTEXT;
2970 #endif
2971 if (testgid == (effective ? PerlProc_getegid() : PerlProc_getgid()))
2972 return TRUE;
2973 #ifdef HAS_GETGROUPS
2974 {
2975 Groups_t *gary = NULL;
2976 I32 anum;
2977 bool rc = FALSE;
2978
2979 anum = getgroups(0, gary);
2980 if (anum > 0) {
2981 Newx(gary, anum, Groups_t);
2982 anum = getgroups(anum, gary);
2983 while (--anum >= 0)
2984 if (gary[anum] == testgid) {
2985 rc = TRUE;
2986 break;
2987 }
2988
2989 Safefree(gary);
2990 }
2991 return rc;
2992 }
2993 #else
2994 return FALSE;
2995 #endif
2996 }
2997
2998 #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
2999
3000 I32
3001 Perl_do_ipcget(pTHX_ I32 optype, SV **mark, SV **sp)
3002 {
3003 const key_t key = (key_t)SvNVx(*++mark);
3004 SV *nsv = optype == OP_MSGGET ? NULL : *++mark;
3005 const I32 flags = SvIVx(*++mark);
3006
3007 PERL_ARGS_ASSERT_DO_IPCGET;
3008 PERL_UNUSED_ARG(sp);
3009
3010 SETERRNO(0,0);
3011 switch (optype)
3012 {
3013 #ifdef HAS_MSG
3014 case OP_MSGGET:
3015 return msgget(key, flags);
3016 #endif
3017 #ifdef HAS_SEM
3018 case OP_SEMGET:
3019 return semget(key, (int) SvIV(nsv), flags);
3020 #endif
3021 #ifdef HAS_SHM
3022 case OP_SHMGET:
3023 return shmget(key, (size_t) SvUV(nsv), flags);
3024 #endif
3025 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
3026 default:
3027 /* diag_listed_as: msg%s not implemented */
3028 Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]);
3029 #endif
3030 }
3031 return -1; /* should never happen */
3032 }
3033
3034 I32
3035 Perl_do_ipcctl(pTHX_ I32 optype, SV **mark, SV **sp)
3036 {
3037 char *a;
3038 I32 ret = -1;
3039 const I32 id = SvIVx(*++mark);
3040 #ifdef Semctl
3041 const I32 n = (optype == OP_SEMCTL) ? SvIVx(*++mark) : 0;
3042 #endif
3043 const I32 cmd = SvIVx(*++mark);
3044 SV * const astr = *++mark;
3045 STRLEN infosize = 0;
3046 I32 getinfo = (cmd == IPC_STAT);
3047
3048 PERL_ARGS_ASSERT_DO_IPCCTL;
3049 PERL_UNUSED_ARG(sp);
3050
3051 switch (optype)
3052 {
3053 #ifdef HAS_MSG
3054 case OP_MSGCTL:
3055 if (cmd == IPC_STAT || cmd == IPC_SET)
3056 infosize = sizeof(struct msqid_ds);
3057 break;
3058 #endif
3059 #ifdef HAS_SHM
3060 case OP_SHMCTL:
3061 if (cmd == IPC_STAT || cmd == IPC_SET)
3062 infosize = sizeof(struct shmid_ds);
3063 break;
3064 #endif
3065 #ifdef HAS_SEM
3066 case OP_SEMCTL:
3067 #ifdef Semctl
3068 if (cmd == IPC_STAT || cmd == IPC_SET)
3069 infosize = sizeof(struct semid_ds);
3070 else if (cmd == GETALL || cmd == SETALL)
3071 {
3072 struct semid_ds semds;
3073 union semun semun;
3074 #ifdef EXTRA_F_IN_SEMUN_BUF
3075 semun.buff = &semds;
3076 #else
3077 semun.buf = &semds;
3078 #endif
3079 getinfo = (cmd == GETALL);
3080 if (Semctl(id, 0, IPC_STAT, semun) == -1)
3081 return -1;
3082 infosize = semds.sem_nsems * sizeof(short);
3083 /* "short" is technically wrong but much more portable
3084 than guessing about u_?short(_t)? */
3085 }
3086 #else
3087 /* diag_listed_as: sem%s not implemented */
3088 Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]);
3089 #endif
3090 break;
3091 #endif
3092 #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM)
3093 default:
3094 /* diag_listed_as: shm%s not implemented */
3095 Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]);
3096 #endif
3097 }
3098
3099 if (infosize)
3100 {
3101 if (getinfo)
3102 {
3103 /* we're not using the value here, so don't SvPVanything */
3104 SvUPGRADE(astr, SVt_PV);
3105 SvGETMAGIC(astr);
3106 if (SvTHINKFIRST(astr))
3107 sv_force_normal_flags(astr, 0);
3108 a = SvGROW(astr, infosize+1);
3109 }
3110 else
3111 {
3112 STRLEN len;
3113 a = SvPVbyte(astr, len);
3114 if (len != infosize)
3115 Perl_croak(aTHX_ "Bad arg length for %s, is %lu, should be %ld",
3116 PL_op_desc[optype],
3117 (unsigned long)len,
3118 (long)infosize);
3119 }
3120 }
3121 else
3122 {
3123 /* We historically treat this as a pointer if we don't otherwise recognize
3124 the op, but for many ops the value is simply ignored anyway, so
3125 don't warn on undef.
3126 */
3127 SvGETMAGIC(astr);
3128 if (SvOK(astr)) {
3129 const IV i = SvIV_nomg(astr);
3130 a = INT2PTR(char *,i); /* ouch */
3131 }
3132 else {
3133 a = NULL;
3134 }
3135 }
3136 SETERRNO(0,0);
3137 switch (optype)
3138 {
3139 #ifdef HAS_MSG
3140 case OP_MSGCTL:
3141 ret = msgctl(id, cmd, (struct msqid_ds *)a);
3142 break;
3143 #endif
3144 #ifdef HAS_SEM
3145 case OP_SEMCTL: {
3146 #ifdef Semctl
3147 union semun unsemds;
3148
3149 if(cmd == SETVAL) {
3150 unsemds.val = PTR2nat(a);
3151 }
3152 else {
3153 #ifdef EXTRA_F_IN_SEMUN_BUF
3154 unsemds.buff = (struct semid_ds *)a;
3155 #else
3156 unsemds.buf = (struct semid_ds *)a;
3157 #endif
3158 }
3159 ret = Semctl(id, n, cmd, unsemds);
3160 #else
3161 /* diag_listed_as: sem%s not implemented */
3162 Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]);
3163 #endif
3164 }
3165 break;
3166 #endif
3167 #ifdef HAS_SHM
3168 case OP_SHMCTL:
3169 ret = shmctl(id, cmd, (struct shmid_ds *)a);
3170 break;
3171 #endif
3172 }
3173 if (getinfo && ret >= 0) {
3174 SvCUR_set(astr, infosize);
3175 *SvEND(astr) = '\0';
3176 SvPOK_only(astr);
3177 SvSETMAGIC(astr);
3178 }
3179 return ret;
3180 }
3181
3182 I32
3183 Perl_do_msgsnd(pTHX_ SV **mark, SV **sp)
3184 {
3185 #ifdef HAS_MSG
3186 STRLEN len;
3187 const I32 id = SvIVx(*++mark);
3188 SV * const mstr = *++mark;
3189 const I32 flags = SvIVx(*++mark);
3190 const char * const mbuf = SvPVbyte(mstr, len);
3191 const I32 msize = len - sizeof(long);
3192
3193 PERL_ARGS_ASSERT_DO_MSGSND;
3194 PERL_UNUSED_ARG(sp);
3195
3196 if (msize < 0)
3197 Perl_croak(aTHX_ "Arg too short for msgsnd");
3198 SETERRNO(0,0);
3199 if (id >= 0 && flags >= 0) {
3200 return msgsnd(id, (struct msgbuf *)mbuf, msize, flags);
3201 } else {
3202 SETERRNO(EINVAL,LIB_INVARG);
3203 return -1;
3204 }
3205 #else
3206 PERL_UNUSED_ARG(sp);
3207 PERL_UNUSED_ARG(mark);
3208 /* diag_listed_as: msg%s not implemented */
3209 Perl_croak(aTHX_ "msgsnd not implemented");
3210 return -1;
3211 #endif
3212 }
3213
3214 I32
3215 Perl_do_msgrcv(pTHX_ SV **mark, SV **sp)
3216 {
3217 #ifdef HAS_MSG
3218 char *mbuf;
3219 long mtype;
3220 I32 msize, flags, ret;
3221 const I32 id = SvIVx(*++mark);
3222 SV * const mstr = *++mark;
3223
3224 PERL_ARGS_ASSERT_DO_MSGRCV;
3225 PERL_UNUSED_ARG(sp);
3226
3227 /* suppress warning when reading into undef var --jhi */
3228 if (! SvOK(mstr))
3229 SvPVCLEAR(mstr);
3230 msize = SvIVx(*++mark);
3231 mtype = (long)SvIVx(*++mark);
3232 flags = SvIVx(*++mark);
3233 SvPV_force_nolen(mstr);
3234 mbuf = SvGROW(mstr, sizeof(long)+msize+1);
3235
3236 SETERRNO(0,0);
3237 if (id >= 0 && msize >= 0 && flags >= 0) {
3238 ret = msgrcv(id, (struct msgbuf *)mbuf, msize, mtype, flags);
3239 } else {
3240 SETERRNO(EINVAL,LIB_INVARG);
3241 ret = -1;
3242 }
3243 if (ret >= 0) {
3244 SvCUR_set(mstr, sizeof(long)+ret);
3245 SvPOK_only(mstr);
3246 *SvEND(mstr) = '\0';
3247 /* who knows who has been playing with this message? */
3248 SvTAINTED_on(mstr);
3249 }
3250 return ret;
3251 #else
3252 PERL_UNUSED_ARG(sp);
3253 PERL_UNUSED_ARG(mark);
3254 /* diag_listed_as: msg%s not implemented */
3255 Perl_croak(aTHX_ "msgrcv not implemented");
3256 return -1;
3257 #endif
3258 }
3259
3260 I32
3261 Perl_do_semop(pTHX_ SV **mark, SV **sp)
3262 {
3263 #ifdef HAS_SEM
3264 STRLEN opsize;
3265 const I32 id = SvIVx(*++mark);
3266 SV * const opstr = *++mark;
3267 const char * const opbuf = SvPVbyte(opstr, opsize);
3268
3269 PERL_ARGS_ASSERT_DO_SEMOP;
3270 PERL_UNUSED_ARG(sp);
3271
3272 if (opsize < 3 * SHORTSIZE
3273 || (opsize % (3 * SHORTSIZE))) {
3274 SETERRNO(EINVAL,LIB_INVARG);
3275 return -1;
3276 }
3277 SETERRNO(0,0);
3278 /* We can't assume that sizeof(struct sembuf) == 3 * sizeof(short). */
3279 {
3280 const int nsops = opsize / (3 * sizeof (short));
3281 int i = nsops;
3282 short * const ops = (short *) opbuf;
3283 short *o = ops;
3284 struct sembuf *temps, *t;
3285 I32 result;
3286
3287 Newx (temps, nsops, struct sembuf);
3288 t = temps;
3289 while (i--) {
3290 t->sem_num = *o++;
3291 t->sem_op = *o++;
3292 t->sem_flg = *o++;
3293 t++;
3294 }
3295 result = semop(id, temps, nsops);
3296 Safefree(temps);
3297 return result;
3298 }
3299 #else
3300 /* diag_listed_as: sem%s not implemented */
3301 Perl_croak(aTHX_ "semop not implemented");
3302 #endif
3303 }
3304
3305 I32
3306 Perl_do_shmio(pTHX_ I32 optype, SV **mark, SV **sp)
3307 {
3308 #ifdef HAS_SHM
3309 char *shm;
3310 struct shmid_ds shmds;
3311 const I32 id = SvIVx(*++mark);
3312 SV * const mstr = *++mark;
3313 const I32 mpos = SvIVx(*++mark);
3314 const I32 msize = SvIVx(*++mark);
3315
3316 PERL_ARGS_ASSERT_DO_SHMIO;
3317 PERL_UNUSED_ARG(sp);
3318
3319 SETERRNO(0,0);
3320 if (shmctl(id, IPC_STAT, &shmds) == -1)
3321 return -1;
3322 if (mpos < 0 || msize < 0
3323 || (size_t)mpos + msize > (size_t)shmds.shm_segsz) {
3324 SETERRNO(EFAULT,SS_ACCVIO); /* can't do as caller requested */
3325 return -1;
3326 }
3327 if (id >= 0) {
3328 shm = (char *)shmat(id, NULL, (optype == OP_SHMREAD) ? SHM_RDONLY : 0);
3329 } else {
3330 SETERRNO(EINVAL,LIB_INVARG);
3331 return -1;
3332 }
3333 if (shm == (char *)-1) /* I hate System V IPC, I really do */
3334 return -1;
3335 if (optype == OP_SHMREAD) {
3336 char *mbuf;
3337 /* suppress warning when reading into undef var (tchrist 3/Mar/00) */
3338 SvGETMAGIC(mstr);
3339 SvUPGRADE(mstr, SVt_PV);
3340 if (! SvOK(mstr))
3341 SvPVCLEAR(mstr);
3342 SvPOK_only(mstr);
3343 mbuf = SvGROW(mstr, (STRLEN)msize+1);
3344
3345 Copy(shm + mpos, mbuf, msize, char);
3346 SvCUR_set(mstr, msize);
3347 *SvEND(mstr) = '\0';
3348 SvSETMAGIC(mstr);
3349 /* who knows who has been playing with this shared memory? */
3350 SvTAINTED_on(mstr);
3351 }
3352 else {
3353 STRLEN len;
3354
3355 const char *mbuf = SvPVbyte(mstr, len);
3356 const I32 n = ((I32)len > msize) ? msize : (I32)len;
3357 Copy(mbuf, shm + mpos, n, char);
3358 if (n < msize)
3359 memzero(shm + mpos + n, msize - n);
3360 }
3361 return shmdt(shm);
3362 #else
3363 /* diag_listed_as: shm%s not implemented */
3364 Perl_croak(aTHX_ "shm I/O not implemented");
3365 return -1;
3366 #endif
3367 }
3368
3369 #endif /* SYSV IPC */
3370
3371 /*
3372 =for apidoc start_glob
3373
3374 Function called by C<do_readline> to spawn a glob (or do the glob inside
3375 perl on VMS). This code used to be inline, but now perl uses C<File::Glob>
3376 this glob starter is only used by miniperl during the build process,
3377 or when PERL_EXTERNAL_GLOB is defined.
3378 Moving it away shrinks F<pp_hot.c>; shrinking F<pp_hot.c> helps speed perl up.
3379
3380 =cut
3381 */
3382
3383 PerlIO *
3384 Perl_start_glob (pTHX_ SV *tmpglob, IO *io)
3385 {
3386 SV * const tmpcmd = newSV(0);
3387 PerlIO *fp;
3388 STRLEN len;
3389 const char *s = SvPV(tmpglob, len);
3390
3391 PERL_ARGS_ASSERT_START_GLOB;
3392
3393 if (!IS_SAFE_SYSCALL(s, len, "pattern", "glob"))
3394 return NULL;
3395
3396 ENTER;
3397 SAVEFREESV(tmpcmd);
3398 #ifdef VMS /* expand the wildcards right here, rather than opening a pipe, */
3399 /* since spawning off a process is a real performance hit */
3400
3401 PerlIO *
3402 Perl_vms_start_glob
3403 (pTHX_ SV *tmpglob,
3404 IO *io);
3405
3406 fp = Perl_vms_start_glob(aTHX_ tmpglob, io);
3407
3408 #else /* !VMS */
3409 # ifdef DOSISH
3410 # if defined(OS2)
3411 sv_setpv(tmpcmd, "for a in ");
3412 sv_catsv(tmpcmd, tmpglob);
3413 sv_catpvs(tmpcmd, "; do echo \"$a\\0\\c\"; done |");
3414 # else
3415 sv_setpv(tmpcmd, "perlglob ");
3416 sv_catsv(tmpcmd, tmpglob);
3417 sv_catpvs(tmpcmd, " |");
3418 # endif
3419 # elif defined(CSH)
3420 sv_setpvn(tmpcmd, PL_cshname, PL_cshlen);
3421 sv_catpvs(tmpcmd, " -cf 'set nonomatch; glob ");
3422 sv_catsv(tmpcmd, tmpglob);
3423 sv_catpvs(tmpcmd, "' 2>/dev/null |");
3424 # else
3425 sv_setpv(tmpcmd, "echo ");
3426 sv_catsv(tmpcmd, tmpglob);
3427 sv_catpvs(tmpcmd, "|tr -s ' \t\f\r' '\\n\\n\\n\\n'|");
3428 # endif /* !DOSISH && !CSH */
3429 {
3430 SV ** const svp = hv_fetchs(GvHVn(PL_envgv), "LS_COLORS", 0);
3431 if (svp && *svp)
3432 save_helem_flags(GvHV(PL_envgv),
3433 newSVpvs_flags("LS_COLORS", SVs_TEMP), svp,
3434 SAVEf_SETMAGIC);
3435 }
3436 (void)do_open6(PL_last_in_gv, SvPVX_const(tmpcmd), SvCUR(tmpcmd),
3437 NULL, NULL, 0);
3438 fp = IoIFP(io);
3439 #endif /* !VMS */
3440 LEAVE;
3441
3442 if (!fp && ckWARN(WARN_GLOB)) {
3443 Perl_warner(aTHX_ packWARN(WARN_GLOB), "glob failed (can't start child: %s)",
3444 Strerror(errno));
3445 }
3446
3447 return fp;
3448 }
3449
3450 /*
3451 * ex: set ts=8 sts=4 sw=4 et:
3452 */
3453