1 /* vi: set sw=4 ts=4: */
5 * Copyright 1998 by Albert Cahalan; all rights reserved.
6 * Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
7 * SELinux support: (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
15 typedef struct id_to_name_map_t {
17 char name[USERNAME_MAX_SIZE];
20 typedef struct cache_t {
21 id_to_name_map_t *cache;
25 static cache_t username, groupname;
27 static void clear_cache(cache_t *cp)
33 void FAST_FUNC clear_username_cache(void)
35 clear_cache(&username);
36 clear_cache(&groupname);
39 #if 0 /* more generic, but we don't need that yet */
40 /* Returns -N-1 if not found. */
41 /* cp->cache[N] is allocated and must be filled in this case */
42 static int get_cached(cache_t *cp, uid_t id)
45 for (i = 0; i < cp->size; i++)
46 if (cp->cache[i].id == id)
49 cp->cache = xrealloc_vector(cp->cache, 2, i);
50 cp->cache[i++].id = id;
55 static char* get_cached(cache_t *cp, uid_t id,
56 char* FAST_FUNC x2x_utoa(uid_t id))
59 for (i = 0; i < cp->size; i++)
60 if (cp->cache[i].id == id)
61 return cp->cache[i].name;
63 cp->cache = xrealloc_vector(cp->cache, 2, i);
65 /* Never fails. Generates numeric string if name isn't found */
66 safe_strncpy(cp->cache[i].name, x2x_utoa(id), sizeof(cp->cache[i].name));
67 return cp->cache[i].name;
69 const char* FAST_FUNC get_cached_username(uid_t uid)
71 return get_cached(&username, uid, uid2uname_utoa);
73 const char* FAST_FUNC get_cached_groupname(gid_t gid)
75 return get_cached(&groupname, gid, gid2group_utoa);
79 #define PROCPS_BUFSIZE 1024
81 static int read_to_buf(const char *filename, void *buf)
84 /* open_read_close() would do two reads, checking for EOF.
85 * When you have 10000 /proc/$NUM/stat to read, it isn't desirable */
87 fd = open(filename, O_RDONLY);
89 ret = read(fd, buf, PROCPS_BUFSIZE-1);
92 ((char *)buf)[ret > 0 ? ret : 0] = '\0';
96 static procps_status_t* FAST_FUNC alloc_procps_scan(void)
98 unsigned n = getpagesize();
99 procps_status_t* sp = xzalloc(sizeof(procps_status_t));
100 sp->dir = xopendir("/proc");
104 sp->shift_pages_to_bytes++;
106 sp->shift_pages_to_kb = sp->shift_pages_to_bytes - 10;
110 void FAST_FUNC free_procps_scan(procps_status_t* sp)
113 #if ENABLE_FEATURE_SHOW_THREADS
115 closedir(sp->task_dir);
119 IF_SELINUX(free(sp->context);)
123 #if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
124 static unsigned long fast_strtoul_16(char **endptr)
130 /* Need to stop on both ' ' and '\n' */
131 while ((c = *str++) > ' ') {
132 c = ((c|0x20) - '0');
134 /* c = c + '0' - 'a' + 10: */
135 c = c - ('a' - '0' - 10);
138 *endptr = str; /* We skip trailing space! */
143 #if ENABLE_FEATURE_FAST_TOP || ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
144 /* We cut a lot of corners here for speed */
145 static unsigned long fast_strtoul_10(char **endptr)
149 unsigned long n = *str - '0';
151 /* Need to stop on both ' ' and '\n' */
152 while ((c = *++str) > ' ')
153 n = n*10 + (c - '0');
155 *endptr = str + 1; /* We skip trailing space! */
159 # if ENABLE_FEATURE_FAST_TOP
160 static long fast_strtol_10(char **endptr)
163 return fast_strtoul_10(endptr);
166 return - (long)fast_strtoul_10(endptr);
170 static char *skip_fields(char *str, int count)
173 while (*str++ != ' ')
175 /* we found a space char, str points after it */
181 #if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
182 int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
183 void (*cb)(struct smaprec *, void *), void *data)
186 struct smaprec currec;
187 char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
188 char buf[PROCPS_BUFSIZE];
190 void (*cb)(struct smaprec *, void *) = NULL;
194 sprintf(filename, "/proc/%u/smaps", (int)pid);
196 file = fopen_for_read(filename);
200 memset(&currec, 0, sizeof(currec));
201 while (fgets(buf, PROCPS_BUFSIZE, file)) {
202 // Each mapping datum has this form:
203 // f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
211 if ((tp = is_prefixed_with(buf, S)) != NULL) { \
212 tp = skip_whitespace(tp); \
213 total->X += currec.X = fast_strtoul_10(&tp); \
217 SCAN("Pss:" , smap_pss );
218 SCAN("Swap:" , smap_swap );
220 SCAN("Private_Dirty:", private_dirty);
221 SCAN("Private_Clean:", private_clean);
222 SCAN("Shared_Dirty:" , shared_dirty );
223 SCAN("Shared_Clean:" , shared_clean );
225 tp = strchr(buf, '-');
227 // We reached next mapping - the line of this form:
228 // f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
231 /* If we have a previous record, there's nothing more
232 * for it, call the callback and clear currec
234 if (currec.smap_size)
236 free(currec.smap_name);
238 memset(&currec, 0, sizeof(currec));
242 currec.smap_start = fast_strtoul_16(&tp);
243 currec.smap_size = (fast_strtoul_16(&tp) - currec.smap_start) >> 10;
245 strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
247 // skipping "rw-s FILEOFS M:m INODE "
248 tp = skip_whitespace(skip_fields(tp, 4));
249 // filter out /dev/something (something != zero)
250 if (!is_prefixed_with(tp, "/dev/") || strcmp(tp, "/dev/zero\n") == 0) {
251 if (currec.smap_mode[1] == 'w') {
252 currec.mapped_rw = currec.smap_size;
253 total->mapped_rw += currec.smap_size;
254 } else if (currec.smap_mode[1] == '-') {
255 currec.mapped_ro = currec.smap_size;
256 total->mapped_ro += currec.smap_size;
260 if (strcmp(tp, "[stack]\n") == 0)
261 total->stack += currec.smap_size;
263 p = skip_non_whitespace(tp);
265 currec.smap_name = xstrdup(" [ anon ]");
268 currec.smap_name = xstrdup(tp);
271 total->smap_size += currec.smap_size;
277 if (currec.smap_size)
279 free(currec.smap_name);
286 procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
289 sp = alloc_procps_scan();
292 struct dirent *entry;
293 char buf[PROCPS_BUFSIZE];
297 char filename[sizeof("/proc/%u/task/%u/cmdline") + sizeof(int)*3 * 2];
300 #if ENABLE_FEATURE_SHOW_THREADS
302 entry = readdir(sp->task_dir);
305 closedir(sp->task_dir);
309 entry = readdir(sp->dir);
311 free_procps_scan(sp);
314 IF_FEATURE_SHOW_THREADS(got_entry:)
315 pid = bb_strtou(entry->d_name, NULL, 10);
318 #if ENABLE_FEATURE_SHOW_THREADS
319 if ((flags & PSSCAN_TASKS) && !sp->task_dir) {
320 /* We found another /proc/PID. Do not use it,
321 * there will be /proc/PID/task/PID (same PID!),
322 * so just go ahead and dive into /proc/PID/task. */
323 sprintf(filename, "/proc/%u/task", pid);
324 /* Note: if opendir fails, we just go to next /proc/XXX */
325 sp->task_dir = opendir(filename);
326 sp->main_thread_pid = pid;
331 /* After this point we can:
332 * "break": stop parsing, return the data
333 * "continue": try next /proc/XXX
336 memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
339 if (!(flags & ~PSSCAN_PID))
340 break; /* we needed only pid, we got it */
343 if (flags & PSSCAN_CONTEXT) {
344 if (getpidcon(sp->pid, &sp->context) < 0)
349 #if ENABLE_FEATURE_SHOW_THREADS
351 filename_tail = filename + sprintf(filename, "/proc/%u/task/%u/", sp->main_thread_pid, pid);
354 filename_tail = filename + sprintf(filename, "/proc/%u/", pid);
356 if (flags & PSSCAN_UIDGID) {
358 if (stat(filename, &sb))
359 continue; /* process probably exited */
360 /* Effective UID/GID, not real */
365 /* These are all retrieved from proc/NN/stat in one go: */
366 if (flags & (PSSCAN_PPID | PSSCAN_PGID | PSSCAN_SID
367 | PSSCAN_COMM | PSSCAN_STATE
368 | PSSCAN_VSZ | PSSCAN_RSS
369 | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_START_TIME
370 | PSSCAN_TTY | PSSCAN_NICE
376 #if !ENABLE_FEATURE_FAST_TOP
377 unsigned long vsz, rss;
379 /* see proc(5) for some details on this */
380 strcpy(filename_tail, "stat");
381 n = read_to_buf(filename, buf);
383 continue; /* process probably exited */
384 cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
385 /*if (!cp || cp[1] != ' ')
388 BUILD_BUG_ON(sizeof(sp->comm) < 16);
389 comm1 = strchr(buf, '(');
391 safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm));
393 #if !ENABLE_FEATURE_FAST_TOP
395 "%c %u " /* state, ppid */
396 "%u %u %d %*s " /* pgid, sid, tty, tpgid */
397 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
398 "%lu %lu " /* utime, stime */
399 "%*s %*s %*s " /* cutime, cstime, priority */
401 "%*s %*s " /* timeout, it_real_value */
402 "%lu " /* start_time */
405 # if ENABLE_FEATURE_TOP_SMP_PROCESS
406 "%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
407 "%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */
408 "%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */
409 "%d" /*cpu last seen on*/
412 sp->state, &sp->ppid,
413 &sp->pgid, &sp->sid, &tty,
414 &sp->utime, &sp->stime,
419 # if ENABLE_FEATURE_TOP_SMP_PROCESS
420 , &sp->last_seen_on_cpu
425 continue; /* bogus data, get next /proc/XXX */
426 # if ENABLE_FEATURE_TOP_SMP_PROCESS
428 sp->last_seen_on_cpu = 0;
431 /* vsz is in bytes and we want kb */
433 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
434 sp->rss = rss << sp->shift_pages_to_kb;
435 sp->tty_major = (tty >> 8) & 0xfff;
436 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
438 /* This costs ~100 bytes more but makes top faster by 20%
439 * If you run 10000 processes, this may be important for you */
440 sp->state[0] = cp[2];
442 sp->ppid = fast_strtoul_10(&cp);
443 sp->pgid = fast_strtoul_10(&cp);
444 sp->sid = fast_strtoul_10(&cp);
445 tty = fast_strtoul_10(&cp);
446 sp->tty_major = (tty >> 8) & 0xfff;
447 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
448 cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
449 sp->utime = fast_strtoul_10(&cp);
450 sp->stime = fast_strtoul_10(&cp);
451 cp = skip_fields(cp, 3); /* cutime, cstime, priority */
452 tasknice = fast_strtol_10(&cp);
453 cp = skip_fields(cp, 2); /* timeout, it_real_value */
454 sp->start_time = fast_strtoul_10(&cp);
455 /* vsz is in bytes and we want kb */
456 sp->vsz = fast_strtoul_10(&cp) >> 10;
457 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
458 sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
459 # if ENABLE_FEATURE_TOP_SMP_PROCESS
460 /* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
461 /* (4): signal, blocked, sigignore, sigcatch */
462 /* (4): wchan, nswap, cnswap, exit_signal */
463 cp = skip_fields(cp, 14);
464 //FIXME: is it safe to assume this field exists?
465 sp->last_seen_on_cpu = fast_strtoul_10(&cp);
467 #endif /* FEATURE_FAST_TOP */
469 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
470 sp->niceness = tasknice;
475 if (sp->vsz == 0 && sp->state[0] != 'Z') {
476 /* not sure what the purpose of this flag */
482 sp->state[s_idx] = '<';
484 sp->state[s_idx] = 'N';
488 #if ENABLE_FEATURE_TOPMEM
489 if (flags & PSSCAN_SMAPS)
490 procps_read_smaps(pid, &sp->smaps, NULL, NULL);
492 #if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
493 if (flags & PSSCAN_RUIDGID) {
496 strcpy(filename_tail, "status");
497 file = fopen_for_read(filename);
499 while (fgets(buf, sizeof(buf), file)) {
501 #define SCAN_TWO(str, name, statement) \
502 if ((tp = is_prefixed_with(buf, str)) != NULL) { \
503 tp = skip_whitespace(tp); \
504 sscanf(tp, "%u", &sp->name); \
507 SCAN_TWO("Uid:", ruid, continue);
508 SCAN_TWO("Gid:", rgid, break);
514 #endif /* PS_ADDITIONAL_COLUMNS */
515 if (flags & PSSCAN_EXE) {
516 strcpy(filename_tail, "exe");
518 sp->exe = xmalloc_readlink(filename);
520 /* Note: if /proc/PID/cmdline is empty,
521 * code below "breaks". Therefore it must be
522 * the last code to parse /proc/PID/xxx data
523 * (we used to have /proc/PID/exe parsing after it
524 * and were getting stale sp->exe).
526 #if 0 /* PSSCAN_CMD is not used */
527 if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
532 strcpy(filename_tail, "cmdline");
533 /* TODO: to get rid of size limits, read into malloc buf,
534 * then realloc it down to real size. */
535 n = read_to_buf(filename, buf);
538 if (flags & PSSCAN_ARGV0)
539 sp->argv0 = xstrdup(buf);
540 if (flags & PSSCAN_CMD) {
543 if ((unsigned char)(buf[n]) < ' ')
546 sp->cmd = xstrdup(buf);
550 if (flags & (PSSCAN_ARGV0|PSSCAN_ARGVN)) {
553 strcpy(filename_tail, "cmdline");
554 n = read_to_buf(filename, buf);
557 if (flags & PSSCAN_ARGVN) {
559 sp->argv0 = xmemdup(buf, n + 1);
560 /* sp->argv0[n] = '\0'; - buf has it */
563 sp->argv0 = xstrdup(buf);
573 void FAST_FUNC read_cmdline(char *buf, int col, unsigned pid, const char *comm)
576 char filename[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
578 sprintf(filename, "/proc/%u/cmdline", pid);
579 sz = open_read_close(filename, buf, col - 1);
585 while (--sz >= 0 && buf[sz] == '\0')
587 /* Prevent basename("process foo/bar") = "bar" */
588 strchrnul(buf, ' ')[0] = '\0';
589 base = bb_basename(buf); /* before we replace argv0's NUL with space */
591 if ((unsigned char)(buf[sz]) < ' ')
595 if (base[0] == '-') /* "-sh" (login shell)? */
598 /* If comm differs from argv0, prepend "{comm} ".
599 * It allows to see thread names set by prctl(PR_SET_NAME).
603 comm_len = strlen(comm);
604 /* Why compare up to comm_len, not COMM_LEN-1?
605 * Well, some processes rewrite argv, and use _spaces_ there
606 * while rewriting. (KDE is observed to do it).
607 * I prefer to still treat argv0 "process foo bar"
608 * as 'equal' to comm "process".
610 if (strncmp(base, comm, comm_len) != 0) {
613 memmove(buf + comm_len, buf, col - comm_len);
614 snprintf(buf, col, "{%s}", comm);
617 buf[comm_len - 1] = ' ';
621 snprintf(buf, col, "[%s]", comm ? comm : "?");
626 // pid comm S ppid pgid sid tty_nr tty_pgrp flg
627 sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
628 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
629 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
643 cputime_to_clock_t(utime),
644 cputime_to_clock_t(stime),
645 cputime_to_clock_t(cutime),
646 cputime_to_clock_t(cstime),
653 mm ? get_mm_rss(mm) : 0,
655 mm ? mm->start_code : 0,
656 mm ? mm->end_code : 0,
657 mm ? mm->start_stack : 0,
660 the rest is some obsolete cruft