1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. Generic MSDOS specialization.
3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005
4 Free Software Foundation, Inc.
5
6 This file is part of the libiberty library.
7 Libiberty is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
11
12 Libiberty is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Library General Public
18 License along with libiberty; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22 #include "pex-common.h"
23
24 #include <stdio.h>
25 #include <errno.h>
26 #ifdef NEED_DECLARATION_ERRNO
27 extern int errno;
28 #endif
29 #ifdef HAVE_STRING_H
30 #include <string.h>
31 #endif
32 #ifdef HAVE_STDLIB_H
33 #include <stdlib.h>
34 #endif
35
36 #include "safe-ctype.h"
37 #include <process.h>
38
39 /* The structure we keep in obj->sysdep. */
40
41 #define PEX_MSDOS_FILE_COUNT 3
42
43 #define PEX_MSDOS_FD_OFFSET 10
44
45 struct pex_msdos
46 {
47 /* An array of file names. We refer to these using file descriptors
48 of 10 + array index. */
49 const char *files[PEX_MSDOS_FILE_COUNT];
50 /* Exit statuses of programs which have been run. */
51 int *statuses;
52 };
53
54 static int pex_msdos_open (struct pex_obj *, const char *, int);
55 static int pex_msdos_open (struct pex_obj *, const char *, int);
56 static int pex_msdos_fdindex (struct pex_msdos *, int);
57 static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *,
58 char * const *, char * const *,
59 int, int, int, int,
60 int, const char **, int *);
61 static int pex_msdos_close (struct pex_obj *, int);
62 static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
63 int, const char **, int *);
64 static void pex_msdos_cleanup (struct pex_obj *);
65
66 /* The list of functions we pass to the common routines. */
67
68 const struct pex_funcs funcs =
69 {
70 pex_msdos_open,
71 pex_msdos_open,
72 pex_msdos_exec_child,
73 pex_msdos_close,
74 pex_msdos_wait,
75 NULL, /* pipe */
76 NULL, /* fdopenr */
77 NULL, /* fdopenw */
78 pex_msdos_cleanup
79 };
80
81 /* Return a newly initialized pex_obj structure. */
82
83 struct pex_obj *
pex_init(int flags,const char * pname,const char * tempbase)84 pex_init (int flags, const char *pname, const char *tempbase)
85 {
86 struct pex_obj *ret;
87 int i;
88
89 /* MSDOS does not support pipes. */
90 flags &= ~ PEX_USE_PIPES;
91
92 ret = pex_init_common (flags, pname, tempbase, funcs);
93
94 ret->sysdep = XNEW (struct pex_msdos);
95 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
96 ret->files[i] = NULL;
97 ret->statuses = NULL;
98
99 return ret;
100 }
101
102 /* Open a file. FIXME: We ignore the binary argument, since we have
103 no way to handle it. */
104
105 static int
pex_msdos_open(struct pex_obj * obj,const char * name,int binary ATTRIBUTE_UNUSED)106 pex_msdos_open (struct pex_obj *obj, const char *name,
107 int binary ATTRIBUTE_UNUSED)
108 {
109 struct pex_msdos *ms;
110 int i;
111
112 ms = (struct pex_msdos *) obj->sysdep;
113
114 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
115 {
116 if (ms->files[i] == NULL)
117 {
118 ms->files[i] = xstrdup (name);
119 return i + PEX_MSDOS_FD_OFFSET;
120 }
121 }
122
123 abort ();
124 }
125
126 /* Get the index into msdos->files associated with an open file
127 descriptor. */
128
129 static int
pex_msdos_fdindex(struct pex_msdos * ms,int fd)130 pex_msdos_fdindex (struct pex_msdos *ms, int fd)
131 {
132 fd -= PEX_MSDOS_FD_OFFSET;
133 if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
134 abort ();
135 return fd;
136 }
137
138
139 /* Close a file. */
140
141 static int
pex_msdos_close(struct pex_obj * obj,int fd)142 pex_msdos_close (struct pex_obj *obj, int fd)
143 {
144 struct pex_msdos *ms;
145 int fdinex;
146
147 ms = (struct pex_msdos *) obj->sysdep;
148 fdindex = pe_msdos_fdindex (ms, fd);
149 free (ms->files[fdindex]);
150 ms->files[fdindex] = NULL;
151 }
152
153 /* Execute a child. */
154
155 static pid_t
pex_msdos_exec_child(struct pex_obj * obj,int flags,const char * executable,char * const * argv,char * const * env,int in,int out,int toclose ATTRIBUTE_UNUSED,int errdes ATTRIBUTE_UNUSED,const char ** errmsg,int * err)156 pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
157 char * const * argv, char * const * env, int in, int out,
158 int toclose ATTRIBUTE_UNUSED,
159 int errdes ATTRIBUTE_UNUSED, const char **errmsg,
160 int *err)
161 {
162 struct pex_msdos *ms;
163 char *temp_base;
164 int temp_base_allocated;
165 char *rf;
166 int inindex;
167 char *infile;
168 int outindex;
169 char *outfile;
170 char *scmd;
171 FILE *argfile;
172 int i;
173 int status;
174
175 ms = (struct pex_msdos *) obj->sysdep;
176
177 /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
178 and PEX_STDERR_TO_STDOUT. */
179
180 temp_base = obj->temp_base;
181 if (temp_base != NULL)
182 temp_base_allocated = 0;
183 else
184 {
185 temp_base = choose_temp_base ();
186 temp_base_allocated = 1;
187 }
188
189 rf = concat (temp_base, ".gp", NULL);
190
191 if (temp_base_allocated)
192 free (temp_base);
193
194 if (in == STDIN_FILE_NO)
195 {
196 inindex = -1;
197 infile = "";
198 }
199 else
200 {
201 inindex = pex_msdos_fdindex (ms, in);
202 infile = ms->files[inindex];
203 }
204
205 if (out == STDOUT_FILE_NO)
206 {
207 outindex = -1;
208 outfile = "";
209 }
210 else
211 {
212 outindex = pex_msdos_fdindex (ms, out);
213 outfile = ms->files[outindex];
214 }
215
216 scmd = XNEWVEC (char, strlen (program)
217 + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
218 + strlen (rf)
219 + strlen (infile)
220 + strlen (outfile)
221 + 10);
222 sprintf (scmd, "%s%s @%s%s%s%s%s",
223 program,
224 (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
225 rf,
226 inindex != -1 ? " <" : "",
227 infile,
228 outindex != -1 ? " >" : "",
229 outfile);
230
231 argfile = fopen (rf, "w");
232 if (argfile == NULL)
233 {
234 *err = errno;
235 free (scmd);
236 free (rf);
237 *errmsg = "cannot open temporary command file";
238 return (pid_t) -1;
239 }
240
241 for (i = 1; argv[i] != NULL; ++i)
242 {
243 char *p;
244
245 for (p = argv[i]; *p != '\0'; ++p)
246 {
247 if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
248 putc ('\\', argfile);
249 putc (*p, argfile);
250 }
251 putc ('\n', argfile);
252 }
253
254 fclose (argfile);
255
256 status = system (scmd);
257
258 if (status == -1)
259 {
260 *err = errno;
261 remove (rf);
262 free (scmd);
263 free (rf);
264 *errmsg = "system";
265 return (pid_t) -1;
266 }
267
268 remove (rf);
269 free (scmd);
270 free (rf);
271
272 /* Save the exit status for later. When we are called, obj->count
273 is the number of children which have executed before this
274 one. */
275 ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
276 ms->statuses[obj->count] = status;
277
278 return (pid_t) obj->count;
279 }
280
281 /* Wait for a child process to complete. Actually the child process
282 has already completed, and we just need to return the exit
283 status. */
284
285 static pid_t
pex_msdos_wait(struct pex_obj * obj,pid_t pid,int * status,struct pex_time * time,int done ATTRIBUTE_UNUSED,const char ** errmsg ATTRIBUTE_UNUSED,int * err ATTRIBUTE_UNUSED)286 pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status,
287 struct pex_time *time, int done ATTRIBUTE_UNUSED,
288 const char **errmsg ATTRIBUTE_UNUSED,
289 int *err ATTRIBUTE_UNUSED)
290 {
291 struct pex_msdos *ms;
292
293 ms = (struct pex_msdos *) obj->sysdep;
294
295 if (time != NULL)
296 memset (time, 0, sizeof *time);
297
298 *status = ms->statuses[pid];
299
300 return 0;
301 }
302
303 /* Clean up the pex_msdos structure. */
304
305 static void
pex_msdos_cleanup(struct pex_obj * obj)306 pex_msdos_cleanup (struct pex_obj *obj)
307 {
308 struct pex_msdos *ms;
309 int i;
310
311 ms = (struct pex_msdos *) obj->sysdep;
312 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
313 free (msdos->files[i]);
314 free (msdos->statuses);
315 free (msdos);
316 obj->sysdep = NULL;
317 }
318