source: MondoRescue/branches/3.0/mindi-busybox/libbb/procps.c@ 3085

Last change on this file since 3085 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 15.2 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 unsigned_to_name_map_t {
16 long id;
17 char name[USERNAME_MAX_SIZE];
18} unsigned_to_name_map_t;
19
20typedef struct cache_t {
21 unsigned_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, unsigned 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, long id,
56 char* FAST_FUNC x2x_utoa(long 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 while ((c = *str++) != ' ') {
131 c = ((c|0x20) - '0');
132 if (c > 9)
133 // c = c + '0' - 'a' + 10:
134 c = c - ('a' - '0' - 10);
135 n = n*16 + c;
136 }
137 *endptr = str; /* We skip trailing space! */
138 return n;
139}
140#endif
141
142#if ENABLE_FEATURE_FAST_TOP || ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
143/* We cut a lot of corners here for speed */
144static unsigned long fast_strtoul_10(char **endptr)
145{
146 char c;
147 char *str = *endptr;
148 unsigned long n = *str - '0';
149
150 while ((c = *++str) != ' ')
151 n = n*10 + (c - '0');
152
153 *endptr = str + 1; /* We skip trailing space! */
154 return n;
155}
156
157# if ENABLE_FEATURE_FAST_TOP
158static long fast_strtol_10(char **endptr)
159{
160 if (**endptr != '-')
161 return fast_strtoul_10(endptr);
162
163 (*endptr)++;
164 return - (long)fast_strtoul_10(endptr);
165}
166# endif
167
168static char *skip_fields(char *str, int count)
169{
170 do {
171 while (*str++ != ' ')
172 continue;
173 /* we found a space char, str points after it */
174 } while (--count);
175 return str;
176}
177#endif
178
179#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
180int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
181 void (*cb)(struct smaprec *, void *), void *data)
182{
183 FILE *file;
184 struct smaprec currec;
185 char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
186 char buf[PROCPS_BUFSIZE];
187#if !ENABLE_PMAP
188 void (*cb)(struct smaprec *, void *) = NULL;
189 void *data = NULL;
190#endif
191
192 sprintf(filename, "/proc/%u/smaps", (int)pid);
193
194 file = fopen_for_read(filename);
195 if (!file)
196 return 1;
197
198 memset(&currec, 0, sizeof(currec));
199 while (fgets(buf, PROCPS_BUFSIZE, file)) {
200 // Each mapping datum has this form:
201 // f7d29000-f7d39000 rw-s ADR M:m OFS FILE
202 // Size: nnn kB
203 // Rss: nnn kB
204 // .....
205
206 char *tp = buf, *p;
207
208#define SCAN(S, X) \
209 if (strncmp(tp, S, sizeof(S)-1) == 0) { \
210 tp = skip_whitespace(tp + sizeof(S)-1); \
211 total->X += currec.X = fast_strtoul_10(&tp); \
212 continue; \
213 }
214 if (cb) {
215 SCAN("Pss:" , smap_pss );
216 SCAN("Swap:" , smap_swap );
217 }
218 SCAN("Private_Dirty:", private_dirty);
219 SCAN("Private_Clean:", private_clean);
220 SCAN("Shared_Dirty:" , shared_dirty );
221 SCAN("Shared_Clean:" , shared_clean );
222#undef SCAN
223 tp = strchr(buf, '-');
224 if (tp) {
225 // We reached next mapping - the line of this form:
226 // f7d29000-f7d39000 rw-s ADR M:m OFS FILE
227
228 if (cb) {
229 /* If we have a previous record, there's nothing more
230 * for it, call the callback and clear currec
231 */
232 if (currec.smap_size)
233 cb(&currec, data);
234 free(currec.smap_name);
235 }
236 memset(&currec, 0, sizeof(currec));
237
238 *tp = ' ';
239 tp = buf;
240 currec.smap_start = fast_strtoul_16(&tp);
241 currec.smap_size = (fast_strtoul_16(&tp) - currec.smap_start) >> 10;
242
243 strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
244
245 // skipping "rw-s ADR M:m OFS "
246 tp = skip_whitespace(skip_fields(tp, 4));
247 // filter out /dev/something (something != zero)
248 if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) {
249 if (currec.smap_mode[1] == 'w') {
250 currec.mapped_rw = currec.smap_size;
251 total->mapped_rw += currec.smap_size;
252 } else if (currec.smap_mode[1] == '-') {
253 currec.mapped_ro = currec.smap_size;
254 total->mapped_ro += currec.smap_size;
255 }
256 }
257
258 if (strcmp(tp, "[stack]\n") == 0)
259 total->stack += currec.smap_size;
260 if (cb) {
261 p = skip_non_whitespace(tp);
262 if (p == tp) {
263 currec.smap_name = xstrdup(" [ anon ]");
264 } else {
265 *p = '\0';
266 currec.smap_name = xstrdup(tp);
267 }
268 }
269 total->smap_size += currec.smap_size;
270 }
271 }
272 fclose(file);
273
274 if (cb) {
275 if (currec.smap_size)
276 cb(&currec, data);
277 free(currec.smap_name);
278 }
279
280 return 0;
281}
282#endif
283
284void BUG_comm_size(void);
285procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
286{
287 struct dirent *entry;
288 char buf[PROCPS_BUFSIZE];
289 char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
290 char *filename_tail;
291 long tasknice;
292 unsigned pid;
293 int n;
294 struct stat sb;
295
296 if (!sp)
297 sp = alloc_procps_scan();
298
299 for (;;) {
300#if ENABLE_FEATURE_SHOW_THREADS
301 if ((flags & PSSCAN_TASKS) && 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 char task_dir[sizeof("/proc/%u/task") + sizeof(int)*3];
324 sprintf(task_dir, "/proc/%u/task", pid);
325 sp->task_dir = xopendir(task_dir);
326 continue;
327 }
328#endif
329
330 /* After this point we can:
331 * "break": stop parsing, return the data
332 * "continue": try next /proc/XXX
333 */
334
335 memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
336
337 sp->pid = pid;
338 if (!(flags & ~PSSCAN_PID))
339 break; /* we needed only pid, we got it */
340
341#if ENABLE_SELINUX
342 if (flags & PSSCAN_CONTEXT) {
343 if (getpidcon(sp->pid, &sp->context) < 0)
344 sp->context = NULL;
345 }
346#endif
347
348 filename_tail = filename + sprintf(filename, "/proc/%u/", pid);
349
350 if (flags & PSSCAN_UIDGID) {
351 if (stat(filename, &sb))
352 continue; /* process probably exited */
353 /* Effective UID/GID, not real */
354 sp->uid = sb.st_uid;
355 sp->gid = sb.st_gid;
356 }
357
358 if (flags & PSSCAN_STAT) {
359 char *cp, *comm1;
360 int tty;
361#if !ENABLE_FEATURE_FAST_TOP
362 unsigned long vsz, rss;
363#endif
364 /* see proc(5) for some details on this */
365 strcpy(filename_tail, "stat");
366 n = read_to_buf(filename, buf);
367 if (n < 0)
368 continue; /* process probably exited */
369 cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
370 /*if (!cp || cp[1] != ' ')
371 continue;*/
372 cp[0] = '\0';
373 if (sizeof(sp->comm) < 16)
374 BUG_comm_size();
375 comm1 = strchr(buf, '(');
376 /*if (comm1)*/
377 safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm));
378
379#if !ENABLE_FEATURE_FAST_TOP
380 n = sscanf(cp+2,
381 "%c %u " /* state, ppid */
382 "%u %u %d %*s " /* pgid, sid, tty, tpgid */
383 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
384 "%lu %lu " /* utime, stime */
385 "%*s %*s %*s " /* cutime, cstime, priority */
386 "%ld " /* nice */
387 "%*s %*s " /* timeout, it_real_value */
388 "%lu " /* start_time */
389 "%lu " /* vsize */
390 "%lu " /* rss */
391# if ENABLE_FEATURE_TOP_SMP_PROCESS
392 "%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
393 "%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */
394 "%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */
395 "%d" /*cpu last seen on*/
396# endif
397 ,
398 sp->state, &sp->ppid,
399 &sp->pgid, &sp->sid, &tty,
400 &sp->utime, &sp->stime,
401 &tasknice,
402 &sp->start_time,
403 &vsz,
404 &rss
405# if ENABLE_FEATURE_TOP_SMP_PROCESS
406 , &sp->last_seen_on_cpu
407# endif
408 );
409
410 if (n < 11)
411 continue; /* bogus data, get next /proc/XXX */
412# if ENABLE_FEATURE_TOP_SMP_PROCESS
413 if (n < 11+15)
414 sp->last_seen_on_cpu = 0;
415# endif
416
417 /* vsz is in bytes and we want kb */
418 sp->vsz = vsz >> 10;
419 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
420 sp->rss = rss << sp->shift_pages_to_kb;
421 sp->tty_major = (tty >> 8) & 0xfff;
422 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
423#else
424/* This costs ~100 bytes more but makes top faster by 20%
425 * If you run 10000 processes, this may be important for you */
426 sp->state[0] = cp[2];
427 cp += 4;
428 sp->ppid = fast_strtoul_10(&cp);
429 sp->pgid = fast_strtoul_10(&cp);
430 sp->sid = fast_strtoul_10(&cp);
431 tty = fast_strtoul_10(&cp);
432 sp->tty_major = (tty >> 8) & 0xfff;
433 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
434 cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
435 sp->utime = fast_strtoul_10(&cp);
436 sp->stime = fast_strtoul_10(&cp);
437 cp = skip_fields(cp, 3); /* cutime, cstime, priority */
438 tasknice = fast_strtol_10(&cp);
439 cp = skip_fields(cp, 2); /* timeout, it_real_value */
440 sp->start_time = fast_strtoul_10(&cp);
441 /* vsz is in bytes and we want kb */
442 sp->vsz = fast_strtoul_10(&cp) >> 10;
443 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
444 sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
445# if ENABLE_FEATURE_TOP_SMP_PROCESS
446 /* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
447 /* (4): signal, blocked, sigignore, sigcatch */
448 /* (4): wchan, nswap, cnswap, exit_signal */
449 cp = skip_fields(cp, 14);
450//FIXME: is it safe to assume this field exists?
451 sp->last_seen_on_cpu = fast_strtoul_10(&cp);
452# endif
453#endif /* FEATURE_FAST_TOP */
454
455#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
456 sp->niceness = tasknice;
457#endif
458
459 if (sp->vsz == 0 && sp->state[0] != 'Z')
460 sp->state[1] = 'W';
461 else
462 sp->state[1] = ' ';
463 if (tasknice < 0)
464 sp->state[2] = '<';
465 else if (tasknice) /* > 0 */
466 sp->state[2] = 'N';
467 else
468 sp->state[2] = ' ';
469 }
470
471#if ENABLE_FEATURE_TOPMEM
472 if (flags & PSSCAN_SMAPS)
473 procps_read_smaps(pid, &sp->smaps, NULL, NULL);
474#endif /* TOPMEM */
475#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
476 if (flags & PSSCAN_RUIDGID) {
477 FILE *file;
478
479 strcpy(filename_tail, "status");
480 file = fopen_for_read(filename);
481 if (file) {
482 while (fgets(buf, sizeof(buf), file)) {
483 char *tp;
484#define SCAN_TWO(str, name, statement) \
485 if (strncmp(buf, str, sizeof(str)-1) == 0) { \
486 tp = skip_whitespace(buf + sizeof(str)-1); \
487 sscanf(tp, "%u", &sp->name); \
488 statement; \
489 }
490 SCAN_TWO("Uid:", ruid, continue);
491 SCAN_TWO("Gid:", rgid, break);
492#undef SCAN_TWO
493 }
494 fclose(file);
495 }
496 }
497#endif /* PS_ADDITIONAL_COLUMNS */
498 if (flags & PSSCAN_EXE) {
499 strcpy(filename_tail, "exe");
500 free(sp->exe);
501 sp->exe = xmalloc_readlink(filename);
502 }
503 /* Note: if /proc/PID/cmdline is empty,
504 * code below "breaks". Therefore it must be
505 * the last code to parse /proc/PID/xxx data
506 * (we used to have /proc/PID/exe parsing after it
507 * and were getting stale sp->exe).
508 */
509#if 0 /* PSSCAN_CMD is not used */
510 if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
511 free(sp->argv0);
512 sp->argv0 = NULL;
513 free(sp->cmd);
514 sp->cmd = NULL;
515 strcpy(filename_tail, "cmdline");
516 /* TODO: to get rid of size limits, read into malloc buf,
517 * then realloc it down to real size. */
518 n = read_to_buf(filename, buf);
519 if (n <= 0)
520 break;
521 if (flags & PSSCAN_ARGV0)
522 sp->argv0 = xstrdup(buf);
523 if (flags & PSSCAN_CMD) {
524 do {
525 n--;
526 if ((unsigned char)(buf[n]) < ' ')
527 buf[n] = ' ';
528 } while (n);
529 sp->cmd = xstrdup(buf);
530 }
531 }
532#else
533 if (flags & (PSSCAN_ARGV0|PSSCAN_ARGVN)) {
534 free(sp->argv0);
535 sp->argv0 = NULL;
536 strcpy(filename_tail, "cmdline");
537 n = read_to_buf(filename, buf);
538 if (n <= 0)
539 break;
540 if (flags & PSSCAN_ARGVN) {
541 sp->argv_len = n;
542 sp->argv0 = xmalloc(n + 1);
543 memcpy(sp->argv0, buf, n + 1);
544 /* sp->argv0[n] = '\0'; - buf has it */
545 } else {
546 sp->argv_len = 0;
547 sp->argv0 = xstrdup(buf);
548 }
549 }
550#endif
551 break;
552 } /* for (;;) */
553
554 return sp;
555}
556
557void FAST_FUNC read_cmdline(char *buf, int col, unsigned pid, const char *comm)
558{
559 int sz;
560 char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
561
562 sprintf(filename, "/proc/%u/cmdline", pid);
563 sz = open_read_close(filename, buf, col - 1);
564 if (sz > 0) {
565 buf[sz] = '\0';
566 while (--sz >= 0 && buf[sz] == '\0')
567 continue;
568 do {
569 if ((unsigned char)(buf[sz]) < ' ')
570 buf[sz] = ' ';
571 } while (--sz >= 0);
572 } else {
573 snprintf(buf, col, "[%s]", comm);
574 }
575}
576
577/* from kernel:
578 // pid comm S ppid pgid sid tty_nr tty_pgrp flg
579 sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
580%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
581%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
582 task->pid,
583 tcomm,
584 state,
585 ppid,
586 pgid,
587 sid,
588 tty_nr,
589 tty_pgrp,
590 task->flags,
591 min_flt,
592 cmin_flt,
593 maj_flt,
594 cmaj_flt,
595 cputime_to_clock_t(utime),
596 cputime_to_clock_t(stime),
597 cputime_to_clock_t(cutime),
598 cputime_to_clock_t(cstime),
599 priority,
600 nice,
601 num_threads,
602 // 0,
603 start_time,
604 vsize,
605 mm ? get_mm_rss(mm) : 0,
606 rsslim,
607 mm ? mm->start_code : 0,
608 mm ? mm->end_code : 0,
609 mm ? mm->start_stack : 0,
610 esp,
611 eip,
612the rest is some obsolete cruft
613*/
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