1 /* vi: set sw=4 ts=4: */
2 /*
3 * Mini ps implementation(s) for busybox
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 * Fix for SELinux Support:(c)2007 Hiroshi Shinji <shiroshi@my.email.ne.jp>
7 * (c)2007 Yuichi Nakamura <ynakam@hitachisoft.jp>
8 *
9 * Licensed under GPLv2, see file LICENSE in this source tree.
10 */
11 //config:config PS
12 //config: bool "ps"
13 //config: default y
14 //config: help
15 //config: ps gives a snapshot of the current processes.
16 //config:
17 //config:config FEATURE_PS_WIDE
18 //config: bool "Enable wide output option (-w)"
19 //config: default y
20 //config: depends on PS && !DESKTOP
21 //config: help
22 //config: Support argument 'w' for wide output.
23 //config: If given once, 132 chars are printed, and if given more
24 //config: than once, the length is unlimited.
25 //config:
26 //config:config FEATURE_PS_LONG
27 //config: bool "Enable long output option (-l)"
28 //config: default y
29 //config: depends on PS && !DESKTOP
30 //config: help
31 //config: Support argument 'l' for long output.
32 //config: Adds fields PPID, RSS, START, TIME & TTY
33 //config:
34 //config:config FEATURE_PS_TIME
35 //config: bool "Enable time and elapsed time output"
36 //config: default y
37 //config: depends on PS && DESKTOP
38 //config: select PLATFORM_LINUX
39 //config: help
40 //config: Support -o time and -o etime output specifiers.
41 //config:
42 //config:config FEATURE_PS_ADDITIONAL_COLUMNS
43 //config: bool "Enable additional ps columns"
44 //config: default y
45 //config: depends on PS && DESKTOP
46 //config: help
47 //config: Support -o rgroup, -o ruser, -o nice output specifiers.
48 //config:
49 //config:config FEATURE_PS_UNUSUAL_SYSTEMS
50 //config: bool "Support Linux prior to 2.4.0 and non-ELF systems"
51 //config: default n
52 //config: depends on FEATURE_PS_TIME
53 //config: help
54 //config: Include support for measuring HZ on old kernels and non-ELF systems
55 //config: (if you are on Linux 2.4.0+ and use ELF, you don't need this)
56
57 //applet:IF_PS(APPLET(ps, BB_DIR_BIN, BB_SUID_DROP))
58
59 //kbuild:lib-$(CONFIG_PS) += ps.o
60
61 //usage:#if ENABLE_DESKTOP
62 //usage:
63 //usage:#define ps_trivial_usage
64 //usage: "[-o COL1,COL2=HEADER]" IF_FEATURE_SHOW_THREADS(" [-T]")
65 //usage:#define ps_full_usage "\n\n"
66 //usage: "Show list of processes\n"
67 //usage: "\n -o COL1,COL2=HEADER Select columns for display"
68 //usage: IF_FEATURE_SHOW_THREADS(
69 //usage: "\n -T Show threads"
70 //usage: )
71 //usage:
72 //usage:#else /* !ENABLE_DESKTOP */
73 //usage:
74 //usage:#if !ENABLE_SELINUX && !ENABLE_FEATURE_PS_WIDE
75 //usage:#define USAGE_PS "\nThis version of ps accepts no options"
76 //usage:#else
77 //usage:#define USAGE_PS ""
78 //usage:#endif
79 //usage:
80 //usage:#define ps_trivial_usage
81 //usage: ""
82 //usage:#define ps_full_usage "\n\n"
83 //usage: "Show list of processes\n"
84 //usage: USAGE_PS
85 //usage: IF_SELINUX(
86 //usage: "\n -Z Show selinux context"
87 //usage: )
88 //usage: IF_FEATURE_PS_WIDE(
89 //usage: "\n w Wide output"
90 //usage: )
91 //usage: IF_FEATURE_PS_LONG(
92 //usage: "\n l Long output"
93 //usage: )
94 //usage: IF_FEATURE_SHOW_THREADS(
95 //usage: "\n T Show threads"
96 //usage: )
97 //usage:
98 //usage:#endif /* ENABLE_DESKTOP */
99 //usage:
100 //usage:#define ps_example_usage
101 //usage: "$ ps\n"
102 //usage: " PID Uid Gid State Command\n"
103 //usage: " 1 root root S init\n"
104 //usage: " 2 root root S [kflushd]\n"
105 //usage: " 3 root root S [kupdate]\n"
106 //usage: " 4 root root S [kpiod]\n"
107 //usage: " 5 root root S [kswapd]\n"
108 //usage: " 742 andersen andersen S [bash]\n"
109 //usage: " 743 andersen andersen S -bash\n"
110 //usage: " 745 root root S [getty]\n"
111 //usage: " 2990 andersen andersen R ps\n"
112
113 #include "libbb.h"
114 #include "common_bufsiz.h"
115 #ifdef __linux__
116 # include <sys/sysinfo.h>
117 #endif
118
119 /* Absolute maximum on output line length */
120 enum { MAX_WIDTH = 2*1024 };
121
122 #if ENABLE_FEATURE_PS_TIME || ENABLE_FEATURE_PS_LONG
get_uptime(void)123 static unsigned long get_uptime(void)
124 {
125 #ifdef __linux__
126 struct sysinfo info;
127 if (sysinfo(&info) < 0)
128 return 0;
129 return info.uptime;
130 #elif 1
131 unsigned long uptime;
132 char buf[sizeof(uptime)*3 + 2];
133 /* /proc/uptime is "UPTIME_SEC.NN IDLE_SEC.NN\n"
134 * (where IDLE is cumulative over all CPUs)
135 */
136 if (open_read_close("/proc/uptime", buf, sizeof(buf)) <= 0)
137 bb_perror_msg_and_die("can't read '%s'", "/proc/uptime");
138 buf[sizeof(buf)-1] = '\0';
139 sscanf(buf, "%lu", &uptime);
140 return uptime;
141 #else
142 struct timespec ts;
143 if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
144 return 0;
145 return ts.tv_sec;
146 #endif
147 }
148 #endif
149
150 #if ENABLE_DESKTOP
151
152 #include <sys/times.h> /* for times() */
153 #ifndef AT_CLKTCK
154 # define AT_CLKTCK 17
155 #endif
156
157 /* TODO:
158 * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
159 * specifies (for XSI-conformant systems) following default columns
160 * (l and f mark columns shown with -l and -f respectively):
161 * F l Flags (octal and additive) associated with the process (??)
162 * S l The state of the process
163 * UID f,l The user ID; the login name is printed with -f
164 * PID The process ID
165 * PPID f,l The parent process
166 * C f,l Processor utilization
167 * PRI l The priority of the process; higher numbers mean lower priority
168 * NI l Nice value
169 * ADDR l The address of the process
170 * SZ l The size in blocks of the core image of the process
171 * WCHAN l The event for which the process is waiting or sleeping
172 * STIME f Starting time of the process
173 * TTY The controlling terminal for the process
174 * TIME The cumulative execution time for the process
175 * CMD The command name; the full command line is shown with -f
176 */
177 typedef struct {
178 uint16_t width;
179 char name6[6];
180 const char *header;
181 void (*f)(char *buf, int size, const procps_status_t *ps);
182 int ps_flags;
183 } ps_out_t;
184
185 struct globals {
186 ps_out_t* out;
187 int out_cnt;
188 int print_header;
189 int need_flags;
190 char *buffer;
191 unsigned terminal_width;
192 #if ENABLE_FEATURE_PS_TIME
193 unsigned kernel_HZ;
194 unsigned long seconds_since_boot;
195 #endif
196 } FIX_ALIASING;
197 #define G (*(struct globals*)bb_common_bufsiz1)
198 #define out (G.out )
199 #define out_cnt (G.out_cnt )
200 #define print_header (G.print_header )
201 #define need_flags (G.need_flags )
202 #define buffer (G.buffer )
203 #define terminal_width (G.terminal_width )
204 #define kernel_HZ (G.kernel_HZ )
205 #define INIT_G() do { setup_common_bufsiz(); } while (0)
206
207 #if ENABLE_FEATURE_PS_TIME
208 /* for ELF executables, notes are pushed before environment and args */
find_elf_note(uintptr_t findme)209 static uintptr_t find_elf_note(uintptr_t findme)
210 {
211 uintptr_t *ep = (uintptr_t *) environ;
212
213 while (*ep++)
214 continue;
215 while (*ep) {
216 if (ep[0] == findme) {
217 return ep[1];
218 }
219 ep += 2;
220 }
221 return -1;
222 }
223
224 #if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
get_HZ_by_waiting(void)225 static unsigned get_HZ_by_waiting(void)
226 {
227 struct timeval tv1, tv2;
228 unsigned t1, t2, r, hz;
229 unsigned cnt = cnt; /* for compiler */
230 int diff;
231
232 r = 0;
233
234 /* Wait for times() to reach new tick */
235 t1 = times(NULL);
236 do {
237 t2 = times(NULL);
238 } while (t2 == t1);
239 gettimeofday(&tv2, NULL);
240
241 do {
242 t1 = t2;
243 tv1.tv_usec = tv2.tv_usec;
244
245 /* Wait exactly one times() tick */
246 do {
247 t2 = times(NULL);
248 } while (t2 == t1);
249 gettimeofday(&tv2, NULL);
250
251 /* Calculate ticks per sec, rounding up to even */
252 diff = tv2.tv_usec - tv1.tv_usec;
253 if (diff <= 0) diff += 1000000;
254 hz = 1000000u / (unsigned)diff;
255 hz = (hz+1) & ~1;
256
257 /* Count how many same hz values we saw */
258 if (r != hz) {
259 r = hz;
260 cnt = 0;
261 }
262 cnt++;
263 } while (cnt < 3); /* exit if saw 3 same values */
264
265 return r;
266 }
267 #else
get_HZ_by_waiting(void)268 static inline unsigned get_HZ_by_waiting(void)
269 {
270 /* Better method? */
271 return 100;
272 }
273 #endif
274
get_kernel_HZ(void)275 static unsigned get_kernel_HZ(void)
276 {
277 if (kernel_HZ)
278 return kernel_HZ;
279
280 /* Works for ELF only, Linux 2.4.0+ */
281 kernel_HZ = find_elf_note(AT_CLKTCK);
282 if (kernel_HZ == (unsigned)-1)
283 kernel_HZ = get_HZ_by_waiting();
284
285 G.seconds_since_boot = get_uptime();
286
287 return kernel_HZ;
288 }
289 #endif
290
291 /* Print value to buf, max size+1 chars (including trailing '\0') */
292
func_user(char * buf,int size,const procps_status_t * ps)293 static void func_user(char *buf, int size, const procps_status_t *ps)
294 {
295 #if 1
296 safe_strncpy(buf, get_cached_username(ps->uid), size+1);
297 #else
298 /* "compatible" version, but it's larger */
299 /* procps 2.18 shows numeric UID if name overflows the field */
300 /* TODO: get_cached_username() returns numeric string if
301 * user has no passwd record, we will display it
302 * left-justified here; too long usernames are shown
303 * as _right-justified_ IDs. Is it worth fixing? */
304 const char *user = get_cached_username(ps->uid);
305 if (strlen(user) <= size)
306 safe_strncpy(buf, user, size+1);
307 else
308 sprintf(buf, "%*u", size, (unsigned)ps->uid);
309 #endif
310 }
311
func_group(char * buf,int size,const procps_status_t * ps)312 static void func_group(char *buf, int size, const procps_status_t *ps)
313 {
314 safe_strncpy(buf, get_cached_groupname(ps->gid), size+1);
315 }
316
func_comm(char * buf,int size,const procps_status_t * ps)317 static void func_comm(char *buf, int size, const procps_status_t *ps)
318 {
319 safe_strncpy(buf, ps->comm, size+1);
320 }
321
func_state(char * buf,int size,const procps_status_t * ps)322 static void func_state(char *buf, int size, const procps_status_t *ps)
323 {
324 safe_strncpy(buf, ps->state, size+1);
325 }
326
func_args(char * buf,int size,const procps_status_t * ps)327 static void func_args(char *buf, int size, const procps_status_t *ps)
328 {
329 read_cmdline(buf, size+1, ps->pid, ps->comm);
330 }
331
func_pid(char * buf,int size,const procps_status_t * ps)332 static void func_pid(char *buf, int size, const procps_status_t *ps)
333 {
334 sprintf(buf, "%*u", size, ps->pid);
335 }
336
func_ppid(char * buf,int size,const procps_status_t * ps)337 static void func_ppid(char *buf, int size, const procps_status_t *ps)
338 {
339 sprintf(buf, "%*u", size, ps->ppid);
340 }
341
func_pgid(char * buf,int size,const procps_status_t * ps)342 static void func_pgid(char *buf, int size, const procps_status_t *ps)
343 {
344 sprintf(buf, "%*u", size, ps->pgid);
345 }
346
put_lu(char * buf,int size,unsigned long u)347 static void put_lu(char *buf, int size, unsigned long u)
348 {
349 char buf4[5];
350
351 /* see http://en.wikipedia.org/wiki/Tera */
352 smart_ulltoa4(u, buf4, " mgtpezy")[0] = '\0';
353 sprintf(buf, "%.*s", size, buf4);
354 }
355
func_vsz(char * buf,int size,const procps_status_t * ps)356 static void func_vsz(char *buf, int size, const procps_status_t *ps)
357 {
358 put_lu(buf, size, ps->vsz);
359 }
360
func_rss(char * buf,int size,const procps_status_t * ps)361 static void func_rss(char *buf, int size, const procps_status_t *ps)
362 {
363 put_lu(buf, size, ps->rss);
364 }
365
func_tty(char * buf,int size,const procps_status_t * ps)366 static void func_tty(char *buf, int size, const procps_status_t *ps)
367 {
368 buf[0] = '?';
369 buf[1] = '\0';
370 if (ps->tty_major) /* tty field of "0" means "no tty" */
371 snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
372 }
373
374 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
375
func_rgroup(char * buf,int size,const procps_status_t * ps)376 static void func_rgroup(char *buf, int size, const procps_status_t *ps)
377 {
378 safe_strncpy(buf, get_cached_groupname(ps->rgid), size+1);
379 }
380
func_ruser(char * buf,int size,const procps_status_t * ps)381 static void func_ruser(char *buf, int size, const procps_status_t *ps)
382 {
383 safe_strncpy(buf, get_cached_username(ps->ruid), size+1);
384 }
385
func_nice(char * buf,int size,const procps_status_t * ps)386 static void func_nice(char *buf, int size, const procps_status_t *ps)
387 {
388 sprintf(buf, "%*d", size, ps->niceness);
389 }
390
391 #endif
392
393 #if ENABLE_FEATURE_PS_TIME
394
func_etime(char * buf,int size,const procps_status_t * ps)395 static void func_etime(char *buf, int size, const procps_status_t *ps)
396 {
397 /* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
398 unsigned long mm;
399 unsigned ss;
400
401 mm = ps->start_time / get_kernel_HZ();
402 /* must be after get_kernel_HZ()! */
403 mm = G.seconds_since_boot - mm;
404 ss = mm % 60;
405 mm /= 60;
406 snprintf(buf, size+1, "%3lu:%02u", mm, ss);
407 }
408
func_time(char * buf,int size,const procps_status_t * ps)409 static void func_time(char *buf, int size, const procps_status_t *ps)
410 {
411 /* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
412 unsigned long mm;
413 unsigned ss;
414
415 mm = (ps->utime + ps->stime) / get_kernel_HZ();
416 ss = mm % 60;
417 mm /= 60;
418 snprintf(buf, size+1, "%3lu:%02u", mm, ss);
419 }
420
421 #endif
422
423 #if ENABLE_SELINUX
func_label(char * buf,int size,const procps_status_t * ps)424 static void func_label(char *buf, int size, const procps_status_t *ps)
425 {
426 safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
427 }
428 #endif
429
430 /*
431 static void func_nice(char *buf, int size, const procps_status_t *ps)
432 {
433 ps->???
434 }
435
436 static void func_pcpu(char *buf, int size, const procps_status_t *ps)
437 {
438 }
439 */
440
441 static const ps_out_t out_spec[] = {
442 /* Mandated by http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html: */
443 { 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
444 { 8 , "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
445 { 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
446 { MAX_WIDTH , "args" ,"COMMAND",func_args ,PSSCAN_COMM },
447 { 5 , "pid" ,"PID" ,func_pid ,PSSCAN_PID },
448 { 5 , "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID },
449 { 5 , "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID },
450 #if ENABLE_FEATURE_PS_TIME
451 { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
452 #endif
453 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
454 { 5 , "nice" ,"NI" ,func_nice ,PSSCAN_NICE },
455 { 8 , "rgroup","RGROUP" ,func_rgroup,PSSCAN_RUIDGID },
456 { 8 , "ruser" ,"RUSER" ,func_ruser ,PSSCAN_RUIDGID },
457 // { 5 , "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
458 #endif
459 #if ENABLE_FEATURE_PS_TIME
460 { 6 , "time" ,"TIME" ,func_time ,PSSCAN_STIME | PSSCAN_UTIME },
461 #endif
462 { 6 , "tty" ,"TT" ,func_tty ,PSSCAN_TTY },
463 { 4 , "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ },
464 /* Not mandated, but useful: */
465 { 4 , "stat" ,"STAT" ,func_state ,PSSCAN_STATE },
466 { 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
467 #if ENABLE_SELINUX
468 { 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
469 #endif
470 };
471
new_out_t(void)472 static ps_out_t* new_out_t(void)
473 {
474 out = xrealloc_vector(out, 2, out_cnt);
475 return &out[out_cnt++];
476 }
477
find_out_spec(const char * name)478 static const ps_out_t* find_out_spec(const char *name)
479 {
480 unsigned i;
481 char buf[ARRAY_SIZE(out_spec)*7 + 1];
482 char *p = buf;
483
484 for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
485 if (strncmp(name, out_spec[i].name6, 6) == 0)
486 return &out_spec[i];
487 p += sprintf(p, "%.6s,", out_spec[i].name6);
488 }
489 p[-1] = '\0';
490 bb_error_msg_and_die("bad -o argument '%s', supported arguments: %s", name, buf);
491 }
492
parse_o(char * opt)493 static void parse_o(char* opt)
494 {
495 ps_out_t* new;
496 // POSIX: "-o is blank- or comma-separated list" (FIXME)
497 char *comma, *equal;
498 while (1) {
499 comma = strchr(opt, ',');
500 equal = strchr(opt, '=');
501 if (comma && (!equal || equal > comma)) {
502 *comma = '\0';
503 *new_out_t() = *find_out_spec(opt);
504 *comma = ',';
505 opt = comma + 1;
506 continue;
507 }
508 break;
509 }
510 // opt points to last spec in comma separated list.
511 // This one can have =HEADER part.
512 new = new_out_t();
513 if (equal)
514 *equal = '\0';
515 *new = *find_out_spec(opt);
516 if (equal) {
517 *equal = '=';
518 new->header = equal + 1;
519 // POSIX: the field widths shall be ... at least as wide as
520 // the header text (default or overridden value).
521 // If the header text is null, such as -o user=,
522 // the field width shall be at least as wide as the
523 // default header text
524 if (new->header[0]) {
525 new->width = strlen(new->header);
526 print_header = 1;
527 }
528 } else
529 print_header = 1;
530 }
531
alloc_line_buffer(void)532 static void alloc_line_buffer(void)
533 {
534 int i;
535 int width = 0;
536 for (i = 0; i < out_cnt; i++) {
537 need_flags |= out[i].ps_flags;
538 if (out[i].header[0]) {
539 print_header = 1;
540 }
541 width += out[i].width + 1; /* "FIELD " */
542 if ((int)(width - terminal_width) > 0) {
543 /* The rest does not fit on the screen */
544 //out[i].width -= (width - terminal_width - 1);
545 out_cnt = i + 1;
546 break;
547 }
548 }
549 #if ENABLE_SELINUX
550 if (!is_selinux_enabled())
551 need_flags &= ~PSSCAN_CONTEXT;
552 #endif
553 buffer = xmalloc(width + 1); /* for trailing \0 */
554 }
555
format_header(void)556 static void format_header(void)
557 {
558 int i;
559 ps_out_t* op;
560 char *p;
561
562 if (!print_header)
563 return;
564 p = buffer;
565 i = 0;
566 if (out_cnt) {
567 while (1) {
568 op = &out[i];
569 if (++i == out_cnt) /* do not pad last field */
570 break;
571 p += sprintf(p, "%-*s ", op->width, op->header);
572 }
573 strcpy(p, op->header);
574 }
575 printf("%.*s\n", terminal_width, buffer);
576 }
577
format_process(const procps_status_t * ps)578 static void format_process(const procps_status_t *ps)
579 {
580 int i, len;
581 char *p = buffer;
582 i = 0;
583 if (out_cnt) while (1) {
584 out[i].f(p, out[i].width, ps);
585 // POSIX: Any field need not be meaningful in all
586 // implementations. In such a case a hyphen ( '-' )
587 // should be output in place of the field value.
588 if (!p[0]) {
589 p[0] = '-';
590 p[1] = '\0';
591 }
592 len = strlen(p);
593 p += len;
594 len = out[i].width - len + 1;
595 if (++i == out_cnt) /* do not pad last field */
596 break;
597 p += sprintf(p, "%*s", len, "");
598 }
599 printf("%.*s\n", terminal_width, buffer);
600 }
601
602 #if ENABLE_SELINUX
603 # define SELINUX_O_PREFIX "label,"
604 # define DEFAULT_O_STR (SELINUX_O_PREFIX "pid,user" IF_FEATURE_PS_TIME(",time") ",args")
605 #else
606 # define DEFAULT_O_STR ("pid,user" IF_FEATURE_PS_TIME(",time") ",args")
607 #endif
608
609 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
ps_main(int argc UNUSED_PARAM,char ** argv)610 int ps_main(int argc UNUSED_PARAM, char **argv)
611 {
612 procps_status_t *p;
613 llist_t* opt_o = NULL;
614 char default_o[sizeof(DEFAULT_O_STR)];
615 int opt;
616 enum {
617 OPT_Z = (1 << 0),
618 OPT_o = (1 << 1),
619 OPT_a = (1 << 2),
620 OPT_A = (1 << 3),
621 OPT_d = (1 << 4),
622 OPT_e = (1 << 5),
623 OPT_f = (1 << 6),
624 OPT_l = (1 << 7),
625 OPT_T = (1 << 8) * ENABLE_FEATURE_SHOW_THREADS,
626 };
627
628 INIT_G();
629
630 // POSIX:
631 // -a Write information for all processes associated with terminals
632 // Implementations may omit session leaders from this list
633 // -A Write information for all processes
634 // -d Write information for all processes, except session leaders
635 // -e Write information for all processes (equivalent to -A)
636 // -f Generate a full listing
637 // -l Generate a long listing
638 // -o col1,col2,col3=header
639 // Select which columns to display
640 /* We allow (and ignore) most of the above. FIXME.
641 * -T is picked for threads (POSIX hasn't standardized it).
642 * procps v3.2.7 supports -T and shows tids as SPID column,
643 * it also supports -L where it shows tids as LWP column.
644 */
645 opt = getopt32(argv, "Zo:*aAdefl"IF_FEATURE_SHOW_THREADS("T"), &opt_o);
646 if (opt_o) {
647 do {
648 parse_o(llist_pop(&opt_o));
649 } while (opt_o);
650 } else {
651 /* Below: parse_o() needs char*, NOT const char*,
652 * can't pass it constant string. Need to make a copy first.
653 */
654 #if ENABLE_SELINUX
655 if (!(opt & OPT_Z) || !is_selinux_enabled()) {
656 /* no -Z or no SELinux: do not show LABEL */
657 strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
658 } else
659 #endif
660 {
661 strcpy(default_o, DEFAULT_O_STR);
662 }
663 parse_o(default_o);
664 }
665 #if ENABLE_FEATURE_SHOW_THREADS
666 if (opt & OPT_T)
667 need_flags |= PSSCAN_TASKS;
668 #endif
669
670 /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
671 * and such large widths */
672 terminal_width = MAX_WIDTH;
673 if (isatty(1)) {
674 terminal_width = get_terminal_width(0);
675 if (--terminal_width > MAX_WIDTH)
676 terminal_width = MAX_WIDTH;
677 }
678 alloc_line_buffer();
679 format_header();
680
681 p = NULL;
682 while ((p = procps_scan(p, need_flags)) != NULL) {
683 format_process(p);
684 }
685
686 return EXIT_SUCCESS;
687 }
688
689
690 #else /* !ENABLE_DESKTOP */
691
692
693 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
ps_main(int argc UNUSED_PARAM,char ** argv UNUSED_PARAM)694 int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
695 {
696 procps_status_t *p;
697 int psscan_flags = PSSCAN_PID | PSSCAN_UIDGID
698 | PSSCAN_STATE | PSSCAN_VSZ | PSSCAN_COMM;
699 unsigned terminal_width IF_NOT_FEATURE_PS_WIDE(= 79);
700 enum {
701 OPT_Z = (1 << 0) * ENABLE_SELINUX,
702 OPT_T = (1 << ENABLE_SELINUX) * ENABLE_FEATURE_SHOW_THREADS,
703 OPT_l = (1 << ENABLE_SELINUX) * (1 << ENABLE_FEATURE_SHOW_THREADS) * ENABLE_FEATURE_PS_LONG,
704 };
705 #if ENABLE_FEATURE_PS_LONG
706 time_t now = now; /* for compiler */
707 unsigned long uptime = uptime;
708 #endif
709 /* If we support any options, parse argv */
710 #if ENABLE_SELINUX || ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_PS_WIDE || ENABLE_FEATURE_PS_LONG
711 int opts = 0;
712 # if ENABLE_FEATURE_PS_WIDE
713 /* -w is a bit complicated */
714 int w_count = 0;
715 opt_complementary = "-:ww";
716 opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l")
717 "w", &w_count);
718 /* if w is given once, GNU ps sets the width to 132,
719 * if w is given more than once, it is "unlimited"
720 */
721 if (w_count) {
722 terminal_width = (w_count == 1) ? 132 : MAX_WIDTH;
723 } else {
724 terminal_width = get_terminal_width(0);
725 /* Go one less... */
726 if (--terminal_width > MAX_WIDTH)
727 terminal_width = MAX_WIDTH;
728 }
729 # else
730 /* -w is not supported, only -Z and/or -T */
731 opt_complementary = "-";
732 opts = getopt32(argv, IF_SELINUX("Z")IF_FEATURE_SHOW_THREADS("T")IF_FEATURE_PS_LONG("l"));
733 # endif
734
735 # if ENABLE_SELINUX
736 if ((opts & OPT_Z) && is_selinux_enabled()) {
737 psscan_flags = PSSCAN_PID | PSSCAN_CONTEXT
738 | PSSCAN_STATE | PSSCAN_COMM;
739 puts(" PID CONTEXT STAT COMMAND");
740 } else
741 # endif
742 if (opts & OPT_l) {
743 psscan_flags = PSSCAN_STATE | PSSCAN_UIDGID | PSSCAN_PID | PSSCAN_PPID
744 | PSSCAN_TTY | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_COMM
745 | PSSCAN_VSZ | PSSCAN_RSS;
746 /* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
747 * mandates for -l:
748 * -F Flags (?)
749 * S State
750 * UID,PID,PPID
751 * -C CPU usage
752 * -PRI The priority of the process; higher numbers mean lower priority
753 * -NI Nice value
754 * -ADDR The address of the process (?)
755 * SZ The size in blocks of the core image
756 * -WCHAN The event for which the process is waiting or sleeping
757 * TTY
758 * TIME The cumulative execution time
759 * CMD
760 * We don't show fields marked with '-'.
761 * We show VSZ and RSS instead of SZ.
762 * We also show STIME (standard says that -f shows it, -l doesn't).
763 */
764 puts("S UID PID PPID VSZ RSS TTY STIME TIME CMD");
765 # if ENABLE_FEATURE_PS_LONG
766 now = time(NULL);
767 uptime = get_uptime();
768 # endif
769 }
770 else {
771 puts(" PID USER VSZ STAT COMMAND");
772 }
773 if (opts & OPT_T) {
774 psscan_flags |= PSSCAN_TASKS;
775 }
776 #endif
777
778 p = NULL;
779 while ((p = procps_scan(p, psscan_flags)) != NULL) {
780 int len;
781 #if ENABLE_SELINUX
782 if (psscan_flags & PSSCAN_CONTEXT) {
783 len = printf("%5u %-32.32s %s ",
784 p->pid,
785 p->context ? p->context : "unknown",
786 p->state);
787 } else
788 #endif
789 {
790 char buf6[6];
791 smart_ulltoa5(p->vsz, buf6, " mgtpezy")[0] = '\0';
792 #if ENABLE_FEATURE_PS_LONG
793 if (opts & OPT_l) {
794 char bufr[6], stime_str[6];
795 char tty[2 * sizeof(int)*3 + 2];
796 char *endp;
797 unsigned sut = (p->stime + p->utime) / 100;
798 unsigned elapsed = uptime - (p->start_time / 100);
799 time_t start = now - elapsed;
800 struct tm *tm = localtime(&start);
801
802 smart_ulltoa5(p->rss, bufr, " mgtpezy")[0] = '\0';
803
804 if (p->tty_major == 136)
805 /* It should be pts/N, not ptsN, but N > 9
806 * will overflow field width...
807 */
808 endp = stpcpy(tty, "pts");
809 else
810 if (p->tty_major == 4) {
811 endp = stpcpy(tty, "tty");
812 if (p->tty_minor >= 64) {
813 p->tty_minor -= 64;
814 *endp++ = 'S';
815 }
816 }
817 else
818 endp = tty + sprintf(tty, "%d:", p->tty_major);
819 strcpy(endp, utoa(p->tty_minor));
820
821 strftime(stime_str, 6, (elapsed >= (24 * 60 * 60)) ? "%b%d" : "%H:%M", tm);
822 stime_str[5] = '\0';
823 // S UID PID PPID VSZ RSS TTY STIME TIME CMD
824 len = printf("%c %5u %5u %5u %5s %5s %-5s %s %02u:%02u:%02u ",
825 p->state[0], p->uid, p->pid, p->ppid, buf6, bufr, tty,
826 stime_str, sut / 3600, (sut % 3600) / 60, sut % 60);
827 } else
828 #endif
829 {
830 const char *user = get_cached_username(p->uid);
831 len = printf("%5u %-8.8s %s %s ",
832 p->pid, user, buf6, p->state);
833 }
834 }
835
836 {
837 int sz = terminal_width - len;
838 if (sz >= 0) {
839 char buf[sz + 1];
840 read_cmdline(buf, sz, p->pid, p->comm);
841 puts(buf);
842 }
843 }
844 }
845 if (ENABLE_FEATURE_CLEAN_UP)
846 clear_username_cache();
847 return EXIT_SUCCESS;
848 }
849
850 #endif /* !ENABLE_DESKTOP */
851