source: MondoRescue/branches/3.3/mindi-busybox/libbb/procps.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 16.6 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
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>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 */
11
12#include "libbb.h"
13
14
15typedef struct id_to_name_map_t {
16 uid_t id;
17 char name[USERNAME_MAX_SIZE];
18} id_to_name_map_t;
19
20typedef struct cache_t {
21 id_to_name_map_t *cache;
22 int size;
23} cache_t;
24
25static cache_t username, groupname;
26
27static void clear_cache(cache_t *cp)
28{
29 free(cp->cache);
30 cp->cache = NULL;
31 cp->size = 0;
32}
33void FAST_FUNC clear_username_cache(void)
34{
35 clear_cache(&username);
36 clear_cache(&groupname);
37}
38
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 */
42static int get_cached(cache_t *cp, uid_t id)
43{
44 int i;
45 for (i = 0; i < cp->size; i++)
46 if (cp->cache[i].id == id)
47 return i;
48 i = cp->size++;
49 cp->cache = xrealloc_vector(cp->cache, 2, i);
50 cp->cache[i++].id = id;
51 return -i;
52}
53#endif
54
55static char* get_cached(cache_t *cp, uid_t id,
56 char* FAST_FUNC x2x_utoa(uid_t id))
57{
58 int i;
59 for (i = 0; i < cp->size; i++)
60 if (cp->cache[i].id == id)
61 return cp->cache[i].name;
62 i = cp->size++;
63 cp->cache = xrealloc_vector(cp->cache, 2, i);
64 cp->cache[i].id = id;
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;
68}
69const char* FAST_FUNC get_cached_username(uid_t uid)
70{
71 return get_cached(&username, uid, uid2uname_utoa);
72}
73const char* FAST_FUNC get_cached_groupname(gid_t gid)
74{
75 return get_cached(&groupname, gid, gid2group_utoa);
76}
77
78
79#define PROCPS_BUFSIZE 1024
80
81static int read_to_buf(const char *filename, void *buf)
82{
83 int fd;
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 */
86 ssize_t ret = -1;
87 fd = open(filename, O_RDONLY);
88 if (fd >= 0) {
89 ret = read(fd, buf, PROCPS_BUFSIZE-1);
90 close(fd);
91 }
92 ((char *)buf)[ret > 0 ? ret : 0] = '\0';
93 return ret;
94}
95
96static procps_status_t* FAST_FUNC alloc_procps_scan(void)
97{
98 unsigned n = getpagesize();
99 procps_status_t* sp = xzalloc(sizeof(procps_status_t));
100 sp->dir = xopendir("/proc");
101 while (1) {
102 n >>= 1;
103 if (!n) break;
104 sp->shift_pages_to_bytes++;
105 }
106 sp->shift_pages_to_kb = sp->shift_pages_to_bytes - 10;
107 return sp;
108}
109
110void FAST_FUNC free_procps_scan(procps_status_t* sp)
111{
112 closedir(sp->dir);
113#if ENABLE_FEATURE_SHOW_THREADS
114 if (sp->task_dir)
115 closedir(sp->task_dir);
116#endif
117 free(sp->argv0);
118 free(sp->exe);
119 IF_SELINUX(free(sp->context);)
120 free(sp);
121}
122
123#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
124static unsigned long fast_strtoul_16(char **endptr)
125{
126 unsigned char c;
127 char *str = *endptr;
128 unsigned long n = 0;
129
130 /* Need to stop on both ' ' and '\n' */
131 while ((c = *str++) > ' ') {
132 c = ((c|0x20) - '0');
133 if (c > 9)
134 /* c = c + '0' - 'a' + 10: */
135 c = c - ('a' - '0' - 10);
136 n = n*16 + c;
137 }
138 *endptr = str; /* We skip trailing space! */
139 return n;
140}
141#endif
142
143#if ENABLE_FEATURE_FAST_TOP || ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
144/* We cut a lot of corners here for speed */
145static unsigned long fast_strtoul_10(char **endptr)
146{
147 unsigned char c;
148 char *str = *endptr;
149 unsigned long n = *str - '0';
150
151 /* Need to stop on both ' ' and '\n' */
152 while ((c = *++str) > ' ')
153 n = n*10 + (c - '0');
154
155 *endptr = str + 1; /* We skip trailing space! */
156 return n;
157}
158
159# if ENABLE_FEATURE_FAST_TOP
160static long fast_strtol_10(char **endptr)
161{
162 if (**endptr != '-')
163 return fast_strtoul_10(endptr);
164
165 (*endptr)++;
166 return - (long)fast_strtoul_10(endptr);
167}
168# endif
169
170static char *skip_fields(char *str, int count)
171{
172 do {
173 while (*str++ != ' ')
174 continue;
175 /* we found a space char, str points after it */
176 } while (--count);
177 return str;
178}
179#endif
180
181#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
182int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
183 void (*cb)(struct smaprec *, void *), void *data)
184{
185 FILE *file;
186 struct smaprec currec;
187 char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
188 char buf[PROCPS_BUFSIZE];
189#if !ENABLE_PMAP
190 void (*cb)(struct smaprec *, void *) = NULL;
191 void *data = NULL;
192#endif
193
194 sprintf(filename, "/proc/%u/smaps", (int)pid);
195
196 file = fopen_for_read(filename);
197 if (!file)
198 return 1;
199
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
204 // Size: nnn kB
205 // Rss: nnn kB
206 // .....
207
208 char *tp, *p;
209
210#define SCAN(S, X) \
211 if ((tp = is_prefixed_with(buf, S)) != NULL) { \
212 tp = skip_whitespace(tp); \
213 total->X += currec.X = fast_strtoul_10(&tp); \
214 continue; \
215 }
216 if (cb) {
217 SCAN("Pss:" , smap_pss );
218 SCAN("Swap:" , smap_swap );
219 }
220 SCAN("Private_Dirty:", private_dirty);
221 SCAN("Private_Clean:", private_clean);
222 SCAN("Shared_Dirty:" , shared_dirty );
223 SCAN("Shared_Clean:" , shared_clean );
224#undef SCAN
225 tp = strchr(buf, '-');
226 if (tp) {
227 // We reached next mapping - the line of this form:
228 // f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
229
230 if (cb) {
231 /* If we have a previous record, there's nothing more
232 * for it, call the callback and clear currec
233 */
234 if (currec.smap_size)
235 cb(&currec, data);
236 free(currec.smap_name);
237 }
238 memset(&currec, 0, sizeof(currec));
239
240 *tp = ' ';
241 tp = buf;
242 currec.smap_start = fast_strtoul_16(&tp);
243 currec.smap_size = (fast_strtoul_16(&tp) - currec.smap_start) >> 10;
244
245 strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
246
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;
257 }
258 }
259
260 if (strcmp(tp, "[stack]\n") == 0)
261 total->stack += currec.smap_size;
262 if (cb) {
263 p = skip_non_whitespace(tp);
264 if (p == tp) {
265 currec.smap_name = xstrdup(" [ anon ]");
266 } else {
267 *p = '\0';
268 currec.smap_name = xstrdup(tp);
269 }
270 }
271 total->smap_size += currec.smap_size;
272 }
273 }
274 fclose(file);
275
276 if (cb) {
277 if (currec.smap_size)
278 cb(&currec, data);
279 free(currec.smap_name);
280 }
281
282 return 0;
283}
284#endif
285
286procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
287{
288 if (!sp)
289 sp = alloc_procps_scan();
290
291 for (;;) {
292 struct dirent *entry;
293 char buf[PROCPS_BUFSIZE];
294 long tasknice;
295 unsigned pid;
296 int n;
297 char filename[sizeof("/proc/%u/task/%u/cmdline") + sizeof(int)*3 * 2];
298 char *filename_tail;
299
300#if ENABLE_FEATURE_SHOW_THREADS
301 if (sp->task_dir) {
302 entry = readdir(sp->task_dir);
303 if (entry)
304 goto got_entry;
305 closedir(sp->task_dir);
306 sp->task_dir = NULL;
307 }
308#endif
309 entry = readdir(sp->dir);
310 if (entry == NULL) {
311 free_procps_scan(sp);
312 return NULL;
313 }
314 IF_FEATURE_SHOW_THREADS(got_entry:)
315 pid = bb_strtou(entry->d_name, NULL, 10);
316 if (errno)
317 continue;
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;
327 continue;
328 }
329#endif
330
331 /* After this point we can:
332 * "break": stop parsing, return the data
333 * "continue": try next /proc/XXX
334 */
335
336 memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
337
338 sp->pid = pid;
339 if (!(flags & ~PSSCAN_PID))
340 break; /* we needed only pid, we got it */
341
342#if ENABLE_SELINUX
343 if (flags & PSSCAN_CONTEXT) {
344 if (getpidcon(sp->pid, &sp->context) < 0)
345 sp->context = NULL;
346 }
347#endif
348
349#if ENABLE_FEATURE_SHOW_THREADS
350 if (sp->task_dir)
351 filename_tail = filename + sprintf(filename, "/proc/%u/task/%u/", sp->main_thread_pid, pid);
352 else
353#endif
354 filename_tail = filename + sprintf(filename, "/proc/%u/", pid);
355
356 if (flags & PSSCAN_UIDGID) {
357 struct stat sb;
358 if (stat(filename, &sb))
359 continue; /* process probably exited */
360 /* Effective UID/GID, not real */
361 sp->uid = sb.st_uid;
362 sp->gid = sb.st_gid;
363 }
364
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
371 | PSSCAN_CPU)
372 ) {
373 char *cp, *comm1;
374 int tty;
375#if !ENABLE_FEATURE_FAST_TOP
376 unsigned long vsz, rss;
377#endif
378 /* see proc(5) for some details on this */
379 strcpy(filename_tail, "stat");
380 n = read_to_buf(filename, buf);
381 if (n < 0)
382 continue; /* process probably exited */
383 cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
384 /*if (!cp || cp[1] != ' ')
385 continue;*/
386 cp[0] = '\0';
387 BUILD_BUG_ON(sizeof(sp->comm) < 16);
388 comm1 = strchr(buf, '(');
389 /*if (comm1)*/
390 safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm));
391
392#if !ENABLE_FEATURE_FAST_TOP
393 n = sscanf(cp+2,
394 "%c %u " /* state, ppid */
395 "%u %u %d %*s " /* pgid, sid, tty, tpgid */
396 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
397 "%lu %lu " /* utime, stime */
398 "%*s %*s %*s " /* cutime, cstime, priority */
399 "%ld " /* nice */
400 "%*s %*s " /* timeout, it_real_value */
401 "%lu " /* start_time */
402 "%lu " /* vsize */
403 "%lu " /* rss */
404# if ENABLE_FEATURE_TOP_SMP_PROCESS
405 "%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
406 "%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */
407 "%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */
408 "%d" /*cpu last seen on*/
409# endif
410 ,
411 sp->state, &sp->ppid,
412 &sp->pgid, &sp->sid, &tty,
413 &sp->utime, &sp->stime,
414 &tasknice,
415 &sp->start_time,
416 &vsz,
417 &rss
418# if ENABLE_FEATURE_TOP_SMP_PROCESS
419 , &sp->last_seen_on_cpu
420# endif
421 );
422
423 if (n < 11)
424 continue; /* bogus data, get next /proc/XXX */
425# if ENABLE_FEATURE_TOP_SMP_PROCESS
426 if (n == 11)
427 sp->last_seen_on_cpu = 0;
428# endif
429
430 /* vsz is in bytes and we want kb */
431 sp->vsz = vsz >> 10;
432 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
433 sp->rss = rss << sp->shift_pages_to_kb;
434 sp->tty_major = (tty >> 8) & 0xfff;
435 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
436#else
437/* This costs ~100 bytes more but makes top faster by 20%
438 * If you run 10000 processes, this may be important for you */
439 sp->state[0] = cp[2];
440 cp += 4;
441 sp->ppid = fast_strtoul_10(&cp);
442 sp->pgid = fast_strtoul_10(&cp);
443 sp->sid = fast_strtoul_10(&cp);
444 tty = fast_strtoul_10(&cp);
445 sp->tty_major = (tty >> 8) & 0xfff;
446 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
447 cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
448 sp->utime = fast_strtoul_10(&cp);
449 sp->stime = fast_strtoul_10(&cp);
450 cp = skip_fields(cp, 3); /* cutime, cstime, priority */
451 tasknice = fast_strtol_10(&cp);
452 cp = skip_fields(cp, 2); /* timeout, it_real_value */
453 sp->start_time = fast_strtoul_10(&cp);
454 /* vsz is in bytes and we want kb */
455 sp->vsz = fast_strtoul_10(&cp) >> 10;
456 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
457 sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
458# if ENABLE_FEATURE_TOP_SMP_PROCESS
459 /* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
460 /* (4): signal, blocked, sigignore, sigcatch */
461 /* (4): wchan, nswap, cnswap, exit_signal */
462 cp = skip_fields(cp, 14);
463//FIXME: is it safe to assume this field exists?
464 sp->last_seen_on_cpu = fast_strtoul_10(&cp);
465# endif
466#endif /* FEATURE_FAST_TOP */
467
468#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
469 sp->niceness = tasknice;
470#endif
471
472 if (sp->vsz == 0 && sp->state[0] != 'Z')
473 sp->state[1] = 'W';
474 else
475 sp->state[1] = ' ';
476 if (tasknice < 0)
477 sp->state[2] = '<';
478 else if (tasknice) /* > 0 */
479 sp->state[2] = 'N';
480 else
481 sp->state[2] = ' ';
482 }
483
484#if ENABLE_FEATURE_TOPMEM
485 if (flags & PSSCAN_SMAPS)
486 procps_read_smaps(pid, &sp->smaps, NULL, NULL);
487#endif /* TOPMEM */
488#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
489 if (flags & PSSCAN_RUIDGID) {
490 FILE *file;
491
492 strcpy(filename_tail, "status");
493 file = fopen_for_read(filename);
494 if (file) {
495 while (fgets(buf, sizeof(buf), file)) {
496 char *tp;
497#define SCAN_TWO(str, name, statement) \
498 if ((tp = is_prefixed_with(buf, str)) != NULL) { \
499 tp = skip_whitespace(tp); \
500 sscanf(tp, "%u", &sp->name); \
501 statement; \
502 }
503 SCAN_TWO("Uid:", ruid, continue);
504 SCAN_TWO("Gid:", rgid, break);
505#undef SCAN_TWO
506 }
507 fclose(file);
508 }
509 }
510#endif /* PS_ADDITIONAL_COLUMNS */
511 if (flags & PSSCAN_EXE) {
512 strcpy(filename_tail, "exe");
513 free(sp->exe);
514 sp->exe = xmalloc_readlink(filename);
515 }
516 /* Note: if /proc/PID/cmdline is empty,
517 * code below "breaks". Therefore it must be
518 * the last code to parse /proc/PID/xxx data
519 * (we used to have /proc/PID/exe parsing after it
520 * and were getting stale sp->exe).
521 */
522#if 0 /* PSSCAN_CMD is not used */
523 if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
524 free(sp->argv0);
525 sp->argv0 = NULL;
526 free(sp->cmd);
527 sp->cmd = NULL;
528 strcpy(filename_tail, "cmdline");
529 /* TODO: to get rid of size limits, read into malloc buf,
530 * then realloc it down to real size. */
531 n = read_to_buf(filename, buf);
532 if (n <= 0)
533 break;
534 if (flags & PSSCAN_ARGV0)
535 sp->argv0 = xstrdup(buf);
536 if (flags & PSSCAN_CMD) {
537 do {
538 n--;
539 if ((unsigned char)(buf[n]) < ' ')
540 buf[n] = ' ';
541 } while (n);
542 sp->cmd = xstrdup(buf);
543 }
544 }
545#else
546 if (flags & (PSSCAN_ARGV0|PSSCAN_ARGVN)) {
547 free(sp->argv0);
548 sp->argv0 = NULL;
549 strcpy(filename_tail, "cmdline");
550 n = read_to_buf(filename, buf);
551 if (n <= 0)
552 break;
553 if (flags & PSSCAN_ARGVN) {
554 sp->argv_len = n;
555 sp->argv0 = xmemdup(buf, n + 1);
556 /* sp->argv0[n] = '\0'; - buf has it */
557 } else {
558 sp->argv_len = 0;
559 sp->argv0 = xstrdup(buf);
560 }
561 }
562#endif
563 break;
564 } /* for (;;) */
565
566 return sp;
567}
568
569void FAST_FUNC read_cmdline(char *buf, int col, unsigned pid, const char *comm)
570{
571 int sz;
572 char filename[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
573
574 sprintf(filename, "/proc/%u/cmdline", pid);
575 sz = open_read_close(filename, buf, col - 1);
576 if (sz > 0) {
577 const char *base;
578 int comm_len;
579
580 buf[sz] = '\0';
581 while (--sz >= 0 && buf[sz] == '\0')
582 continue;
583 /* Prevent basename("process foo/bar") = "bar" */
584 strchrnul(buf, ' ')[0] = '\0';
585 base = bb_basename(buf); /* before we replace argv0's NUL with space */
586 while (sz >= 0) {
587 if ((unsigned char)(buf[sz]) < ' ')
588 buf[sz] = ' ';
589 sz--;
590 }
591 if (base[0] == '-') /* "-sh" (login shell)? */
592 base++;
593
594 /* If comm differs from argv0, prepend "{comm} ".
595 * It allows to see thread names set by prctl(PR_SET_NAME).
596 */
597 if (!comm)
598 return;
599 comm_len = strlen(comm);
600 /* Why compare up to comm_len, not COMM_LEN-1?
601 * Well, some processes rewrite argv, and use _spaces_ there
602 * while rewriting. (KDE is observed to do it).
603 * I prefer to still treat argv0 "process foo bar"
604 * as 'equal' to comm "process".
605 */
606 if (strncmp(base, comm, comm_len) != 0) {
607 comm_len += 3;
608 if (col > comm_len)
609 memmove(buf + comm_len, buf, col - comm_len);
610 snprintf(buf, col, "{%s}", comm);
611 if (col <= comm_len)
612 return;
613 buf[comm_len - 1] = ' ';
614 buf[col - 1] = '\0';
615 }
616 } else {
617 snprintf(buf, col, "[%s]", comm ? comm : "?");
618 }
619}
620
621/* from kernel:
622 // pid comm S ppid pgid sid tty_nr tty_pgrp flg
623 sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
624%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
625%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
626 task->pid,
627 tcomm,
628 state,
629 ppid,
630 pgid,
631 sid,
632 tty_nr,
633 tty_pgrp,
634 task->flags,
635 min_flt,
636 cmin_flt,
637 maj_flt,
638 cmaj_flt,
639 cputime_to_clock_t(utime),
640 cputime_to_clock_t(stime),
641 cputime_to_clock_t(cutime),
642 cputime_to_clock_t(cstime),
643 priority,
644 nice,
645 num_threads,
646 // 0,
647 start_time,
648 vsize,
649 mm ? get_mm_rss(mm) : 0,
650 rsslim,
651 mm ? mm->start_code : 0,
652 mm ? mm->end_code : 0,
653 mm ? mm->start_stack : 0,
654 esp,
655 eip,
656the rest is some obsolete cruft
657*/
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