1 /* vi: set sw=4 ts=4: */
3 * Mini ps implementation(s) for busybox
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>
9 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
14 /* Absolute maximum on output line length */
15 enum { MAX_WIDTH = 2*1024 };
19 #include <sys/times.h> /* for times() */
20 //#include <sys/sysinfo.h> /* for sysinfo() */
27 #define SELINUX_O_PREFIX "label,"
28 #define DEFAULT_O_STR (SELINUX_O_PREFIX "pid,user" USE_FEATURE_PS_TIME(",time") ",args")
30 #define DEFAULT_O_STR ("pid,user" USE_FEATURE_PS_TIME(",time") ",args")
37 void (*f)(char *buf, int size, const procps_status_t *ps);
47 unsigned terminal_width;
48 #if ENABLE_FEATURE_PS_TIME
50 unsigned long long seconds_since_boot;
52 char default_o[sizeof(DEFAULT_O_STR)];
54 #define G (*(struct globals*)&bb_common_bufsiz1)
56 #define out_cnt (G.out_cnt )
57 #define print_header (G.print_header )
58 #define need_flags (G.need_flags )
59 #define buffer (G.buffer )
60 #define terminal_width (G.terminal_width )
61 #define kernel_HZ (G.kernel_HZ )
62 #define seconds_since_boot (G.seconds_since_boot)
63 #define default_o (G.default_o )
65 #if ENABLE_FEATURE_PS_TIME
66 /* for ELF executables, notes are pushed before environment and args */
67 static ptrdiff_t find_elf_note(ptrdiff_t findme)
69 ptrdiff_t *ep = (ptrdiff_t *) environ;
73 if (ep[0] == findme) {
81 #if ENABLE_FEATURE_PS_UNUSUAL_SYSTEMS
82 static unsigned get_HZ_by_waiting(void)
84 struct timeval tv1, tv2;
85 unsigned t1, t2, r, hz;
86 unsigned cnt = cnt; /* for compiler */
91 /* Wait for times() to reach new tick */
96 gettimeofday(&tv2, NULL);
100 tv1.tv_usec = tv2.tv_usec;
102 /* Wait exactly one times() tick */
106 gettimeofday(&tv2, NULL);
108 /* Calculate ticks per sec, rounding up to even */
109 diff = tv2.tv_usec - tv1.tv_usec;
110 if (diff <= 0) diff += 1000000;
111 hz = 1000000u / (unsigned)diff;
114 /* Count how many same hz values we saw */
120 } while (cnt < 3); /* exit if saw 3 same values */
125 static inline unsigned get_HZ_by_waiting(void)
132 static unsigned get_kernel_HZ(void)
140 /* Works for ELF only, Linux 2.4.0+ */
141 kernel_HZ = find_elf_note(AT_CLKTCK);
142 if (kernel_HZ == (unsigned)-1)
143 kernel_HZ = get_HZ_by_waiting();
145 //if (open_read_close("/proc/uptime", buf, sizeof(buf) <= 0)
146 // bb_perror_msg_and_die("cannot read %s", "/proc/uptime");
147 //buf[sizeof(buf)-1] = '\0';
148 ///sscanf(buf, "%llu", &seconds_since_boot);
150 seconds_since_boot = info.uptime;
156 /* Print value to buf, max size+1 chars (including trailing '\0') */
158 static void func_user(char *buf, int size, const procps_status_t *ps)
161 safe_strncpy(buf, get_cached_username(ps->uid), size+1);
163 /* "compatible" version, but it's larger */
164 /* procps 2.18 shows numeric UID if name overflows the field */
165 /* TODO: get_cached_username() returns numeric string if
166 * user has no passwd record, we will display it
167 * left-justified here; too long usernames are shown
168 * as _right-justified_ IDs. Is it worth fixing? */
169 const char *user = get_cached_username(ps->uid);
170 if (strlen(user) <= size)
171 safe_strncpy(buf, user, size+1);
173 sprintf(buf, "%*u", size, (unsigned)ps->uid);
177 static void func_comm(char *buf, int size, const procps_status_t *ps)
179 safe_strncpy(buf, ps->comm, size+1);
182 static void func_args(char *buf, int size, const procps_status_t *ps)
184 read_cmdline(buf, size, ps->pid, ps->comm);
187 static void func_pid(char *buf, int size, const procps_status_t *ps)
189 sprintf(buf, "%*u", size, ps->pid);
192 static void func_ppid(char *buf, int size, const procps_status_t *ps)
194 sprintf(buf, "%*u", size, ps->ppid);
197 static void func_pgid(char *buf, int size, const procps_status_t *ps)
199 sprintf(buf, "%*u", size, ps->pgid);
202 static void put_lu(char *buf, int size, unsigned long u)
206 /* see http://en.wikipedia.org/wiki/Tera */
207 smart_ulltoa4(u, buf4, " mgtpezy");
209 sprintf(buf, "%.*s", size, buf4);
212 static void func_vsz(char *buf, int size, const procps_status_t *ps)
214 put_lu(buf, size, ps->vsz);
217 static void func_rss(char *buf, int size, const procps_status_t *ps)
219 put_lu(buf, size, ps->rss);
222 static void func_tty(char *buf, int size, const procps_status_t *ps)
226 if (ps->tty_major) /* tty field of "0" means "no tty" */
227 snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor);
230 #if ENABLE_FEATURE_PS_TIME
231 static void func_etime(char *buf, int size, const procps_status_t *ps)
233 /* elapsed time [[dd-]hh:]mm:ss; here only mm:ss */
237 mm = ps->start_time / get_kernel_HZ();
238 /* must be after get_kernel_HZ()! */
239 mm = seconds_since_boot - mm;
242 snprintf(buf, size+1, "%3lu:%02u", mm, ss);
245 static void func_time(char *buf, int size, const procps_status_t *ps)
247 /* cumulative time [[dd-]hh:]mm:ss; here only mm:ss */
251 mm = (ps->utime + ps->stime) / get_kernel_HZ();
254 snprintf(buf, size+1, "%3lu:%02u", mm, ss);
259 static void func_label(char *buf, int size, const procps_status_t *ps)
261 safe_strncpy(buf, ps->context ? ps->context : "unknown", size+1);
266 static void func_nice(char *buf, int size, const procps_status_t *ps)
271 static void func_pcpu(char *buf, int size, const procps_status_t *ps)
276 static const ps_out_t out_spec[] = {
277 // Mandated by POSIX:
278 { 8 , "user" ,"USER" ,func_user ,PSSCAN_UIDGID },
279 { 16 , "comm" ,"COMMAND",func_comm ,PSSCAN_COMM },
280 { 256 , "args" ,"COMMAND",func_args ,PSSCAN_COMM },
281 { 5 , "pid" ,"PID" ,func_pid ,PSSCAN_PID },
282 { 5 , "ppid" ,"PPID" ,func_ppid ,PSSCAN_PPID },
283 { 5 , "pgid" ,"PGID" ,func_pgid ,PSSCAN_PGID },
284 #if ENABLE_FEATURE_PS_TIME
285 { sizeof("ELAPSED")-1, "etime" ,"ELAPSED",func_etime ,PSSCAN_START_TIME },
287 // { sizeof("GROUP" )-1, "group" ,"GROUP" ,func_group ,PSSCAN_UIDGID },
288 // { sizeof("NI" )-1, "nice" ,"NI" ,func_nice ,PSSCAN_ },
289 // { sizeof("%CPU" )-1, "pcpu" ,"%CPU" ,func_pcpu ,PSSCAN_ },
290 // { sizeof("RGROUP" )-1, "rgroup","RGROUP" ,func_rgroup,PSSCAN_UIDGID },
291 // { sizeof("RUSER" )-1, "ruser" ,"RUSER" ,func_ruser ,PSSCAN_UIDGID },
292 #if ENABLE_FEATURE_PS_TIME
293 { 6 , "time" ,"TIME" ,func_time ,PSSCAN_STIME | PSSCAN_UTIME },
295 { 6 , "tty" ,"TT" ,func_tty ,PSSCAN_TTY },
296 { 4 , "vsz" ,"VSZ" ,func_vsz ,PSSCAN_VSZ },
297 // Not mandated by POSIX, but useful:
298 { 4 , "rss" ,"RSS" ,func_rss ,PSSCAN_RSS },
300 { 35 , "label" ,"LABEL" ,func_label ,PSSCAN_CONTEXT },
304 static ps_out_t* new_out_t(void)
306 out = xrealloc_vector(out, 2, out_cnt);
307 return &out[out_cnt++];
310 static const ps_out_t* find_out_spec(const char *name)
313 for (i = 0; i < ARRAY_SIZE(out_spec); i++) {
314 if (!strcmp(name, out_spec[i].name))
317 bb_error_msg_and_die("bad -o argument '%s'", name);
320 static void parse_o(char* opt)
323 // POSIX: "-o is blank- or comma-separated list" (FIXME)
326 comma = strchr(opt, ',');
327 equal = strchr(opt, '=');
328 if (comma && (!equal || equal > comma)) {
330 *new_out_t() = *find_out_spec(opt);
337 // opt points to last spec in comma separated list.
338 // This one can have =HEADER part.
342 *new = *find_out_spec(opt);
345 new->header = equal + 1;
346 // POSIX: the field widths shall be ... at least as wide as
347 // the header text (default or overridden value).
348 // If the header text is null, such as -o user=,
349 // the field width shall be at least as wide as the
350 // default header text
351 if (new->header[0]) {
352 new->width = strlen(new->header);
359 static void post_process(void)
363 for (i = 0; i < out_cnt; i++) {
364 need_flags |= out[i].ps_flags;
365 if (out[i].header[0]) {
368 width += out[i].width + 1; /* "FIELD " */
371 if (!is_selinux_enabled())
372 need_flags &= ~PSSCAN_CONTEXT;
374 buffer = xmalloc(width + 1); /* for trailing \0 */
377 static void format_header(void)
390 if (++i == out_cnt) /* do not pad last field */
392 p += sprintf(p, "%-*s ", op->width, op->header);
394 strcpy(p, op->header);
396 printf("%.*s\n", terminal_width, buffer);
399 static void format_process(const procps_status_t *ps)
404 if (out_cnt) while (1) {
405 out[i].f(p, out[i].width, ps);
406 // POSIX: Any field need not be meaningful in all
407 // implementations. In such a case a hyphen ( '-' )
408 // should be output in place of the field value.
415 len = out[i].width - len + 1;
416 if (++i == out_cnt) /* do not pad last field */
418 p += sprintf(p, "%*s", len, "");
420 printf("%.*s\n", terminal_width, buffer);
423 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
424 int ps_main(int argc UNUSED_PARAM, char **argv)
427 llist_t* opt_o = NULL;
428 USE_SELINUX(int opt;)
431 // -a Write information for all processes associated with terminals
432 // Implementations may omit session leaders from this list
433 // -A Write information for all processes
434 // -d Write information for all processes, except session leaders
435 // -e Write information for all processes (equivalent to -A.)
436 // -f Generate a full listing
437 // -l Generate a long listing
438 // -o col1,col2,col3=header
439 // Select which columns to display
440 /* We allow (and ignore) most of the above. FIXME */
441 opt_complementary = "o::";
442 USE_SELINUX(opt =) getopt32(argv, "Zo:aAdefl", &opt_o);
445 parse_o(llist_pop(&opt_o));
448 /* Below: parse_o() needs char*, NOT const char*... */
450 if (!(opt & 1) || !is_selinux_enabled()) {
451 /* no -Z or no SELinux: do not show LABEL */
452 strcpy(default_o, DEFAULT_O_STR + sizeof(SELINUX_O_PREFIX)-1);
456 strcpy(default_o, DEFAULT_O_STR);
462 /* Was INT_MAX, but some libc's go belly up with printf("%.*s")
463 * and such large widths */
464 terminal_width = MAX_WIDTH;
466 get_terminal_width_height(0, &terminal_width, NULL);
467 if (--terminal_width > MAX_WIDTH)
468 terminal_width = MAX_WIDTH;
473 while ((p = procps_scan(p, need_flags))) {
481 #else /* !ENABLE_DESKTOP */
484 int ps_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
485 int ps_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
487 procps_status_t *p = NULL;
489 SKIP_SELINUX(const) int use_selinux = 0;
491 #if !ENABLE_FEATURE_PS_WIDE
492 enum { terminal_width = 79 };
494 unsigned terminal_width;
498 #if ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX
499 #if ENABLE_FEATURE_PS_WIDE
500 opt_complementary = "-:ww";
501 USE_SELINUX(i =) getopt32(argv, USE_SELINUX("Z") "w", &w_count);
502 /* if w is given once, GNU ps sets the width to 132,
503 * if w is given more than once, it is "unlimited"
506 terminal_width = (w_count==1) ? 132 : MAX_WIDTH;
508 get_terminal_width_height(0, &terminal_width, NULL);
510 if (--terminal_width > MAX_WIDTH)
511 terminal_width = MAX_WIDTH;
513 #else /* only ENABLE_SELINUX */
514 i = getopt32(argv, "Z");
517 if ((i & 1) && is_selinux_enabled())
518 use_selinux = PSSCAN_CONTEXT;
520 #endif /* ENABLE_FEATURE_PS_WIDE || ENABLE_SELINUX */
523 puts(" PID CONTEXT STAT COMMAND");
525 puts(" PID USER VSZ STAT COMMAND");
527 while ((p = procps_scan(p, 0
537 len = printf("%5u %-32.32s %s ",
539 p->context ? p->context : "unknown",
544 const char *user = get_cached_username(p->uid);
546 // len = printf("%5u %-8.8s %s ",
547 // p->pid, user, p->state);
551 smart_ulltoa5(p->vsz, buf6, " mgtpezy");
553 len = printf("%5u %-8.8s %s %s ",
554 p->pid, user, buf6, p->state);
559 int sz = terminal_width - len;
561 read_cmdline(buf, sz, p->pid, p->comm);
565 if (ENABLE_FEATURE_CLEAN_UP)
566 clear_username_cache();
570 #endif /* ENABLE_DESKTOP */