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 tarball for details.
15 typedef struct unsigned_to_name_map_t {
17 char name[USERNAME_MAX_SIZE];
18 } unsigned_to_name_map_t;
20 typedef struct cache_t {
21 unsigned_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, unsigned id)
45 for (i = 0; i < cp->size; i++)
46 if (cp->cache[i].id == id)
49 cp->cache = xrealloc_vector(cp->cache, 2, cp->size++);
50 cp->cache[i++].id = id;
55 typedef char* FAST_FUNC ug_func(char *name, int bufsize, long uid);
56 static char* get_cached(cache_t *cp, unsigned id, ug_func* fp)
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, cp->size++);
65 /* Never fails. Generates numeric string if name isn't found */
66 fp(cp->cache[i].name, sizeof(cp->cache[i].name), id);
67 return cp->cache[i].name;
69 const char* FAST_FUNC get_cached_username(uid_t uid)
71 return get_cached(&username, uid, bb_getpwuid);
73 const char* FAST_FUNC get_cached_groupname(gid_t gid)
75 return get_cached(&groupname, gid, bb_getgrgid);
79 #define PROCPS_BUFSIZE 1024
81 static int FAST_FUNC 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)
114 USE_SELINUX(free(sp->context);)
118 #if ENABLE_FEATURE_TOPMEM
119 static unsigned long fast_strtoul_16(char **endptr)
125 while ((c = *str++) != ' ') {
126 c = ((c|0x20) - '0');
128 // c = c + '0' - 'a' + 10:
129 c = c - ('a' - '0' - 10);
132 *endptr = str; /* We skip trailing space! */
135 /* TOPMEM uses fast_strtoul_10, so... */
136 #undef ENABLE_FEATURE_FAST_TOP
137 #define ENABLE_FEATURE_FAST_TOP 1
140 #if ENABLE_FEATURE_FAST_TOP
141 /* We cut a lot of corners here for speed */
142 static unsigned long fast_strtoul_10(char **endptr)
146 unsigned long n = *str - '0';
148 while ((c = *++str) != ' ')
149 n = n*10 + (c - '0');
151 *endptr = str + 1; /* We skip trailing space! */
154 static char *skip_fields(char *str, int count)
157 while (*str++ != ' ')
159 /* we found a space char, str points after it */
165 void BUG_comm_size(void);
166 procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
168 struct dirent *entry;
169 char buf[PROCPS_BUFSIZE];
170 char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
178 sp = alloc_procps_scan();
181 entry = readdir(sp->dir);
183 free_procps_scan(sp);
186 pid = bb_strtou(entry->d_name, NULL, 10);
190 /* After this point we have to break, not continue
191 * ("continue" would mean that current /proc/NNN
192 * is not a valid process info) */
194 memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
197 if (!(flags & ~PSSCAN_PID)) break;
200 if (flags & PSSCAN_CONTEXT) {
201 if (getpidcon(sp->pid, &sp->context) < 0)
206 filename_tail = filename + sprintf(filename, "/proc/%d", pid);
208 if (flags & PSSCAN_UIDGID) {
209 if (stat(filename, &sb))
211 /* Need comment - is this effective or real UID/GID? */
216 if (flags & PSSCAN_STAT) {
219 #if !ENABLE_FEATURE_FAST_TOP
220 unsigned long vsz, rss;
223 /* see proc(5) for some details on this */
224 strcpy(filename_tail, "/stat");
225 n = read_to_buf(filename, buf);
228 cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
229 /*if (!cp || cp[1] != ' ')
232 if (sizeof(sp->comm) < 16)
234 comm1 = strchr(buf, '(');
236 safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm));
238 #if !ENABLE_FEATURE_FAST_TOP
240 "%c %u " /* state, ppid */
241 "%u %u %d %*s " /* pgid, sid, tty, tpgid */
242 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
243 "%lu %lu " /* utime, stime */
244 "%*s %*s %*s " /* cutime, cstime, priority */
246 "%*s %*s " /* timeout, it_real_value */
247 "%lu " /* start_time */
250 /* "%lu %lu %lu %lu %lu %lu " rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
251 /* "%u %u %u %u " signal, blocked, sigignore, sigcatch */
252 /* "%lu %lu %lu" wchan, nswap, cnswap */
254 sp->state, &sp->ppid,
255 &sp->pgid, &sp->sid, &tty,
256 &sp->utime, &sp->stime,
263 /* vsz is in bytes and we want kb */
265 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
266 sp->rss = rss << sp->shift_pages_to_kb;
267 sp->tty_major = (tty >> 8) & 0xfff;
268 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
270 /* This costs ~100 bytes more but makes top faster by 20%
271 * If you run 10000 processes, this may be important for you */
272 sp->state[0] = cp[2];
274 sp->ppid = fast_strtoul_10(&cp);
275 sp->pgid = fast_strtoul_10(&cp);
276 sp->sid = fast_strtoul_10(&cp);
277 tty = fast_strtoul_10(&cp);
278 sp->tty_major = (tty >> 8) & 0xfff;
279 sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
280 cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
281 sp->utime = fast_strtoul_10(&cp);
282 sp->stime = fast_strtoul_10(&cp);
283 cp = skip_fields(cp, 3); /* cutime, cstime, priority */
284 tasknice = fast_strtoul_10(&cp);
285 cp = skip_fields(cp, 2); /* timeout, it_real_value */
286 sp->start_time = fast_strtoul_10(&cp);
287 /* vsz is in bytes and we want kb */
288 sp->vsz = fast_strtoul_10(&cp) >> 10;
289 /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
290 sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
293 if (sp->vsz == 0 && sp->state[0] != 'Z')
299 else if (tasknice) /* > 0 */
306 #if ENABLE_FEATURE_TOPMEM
307 if (flags & (PSSCAN_SMAPS)) {
310 strcpy(filename_tail, "/smaps");
311 file = fopen(filename, "r");
314 while (fgets(buf, sizeof(buf), file)) {
318 #define SCAN(str, name) \
319 if (strncmp(buf, str, sizeof(str)-1) == 0) { \
320 tp = skip_whitespace(buf + sizeof(str)-1); \
321 sp->name += fast_strtoul_10(&tp); \
324 SCAN("Shared_Clean:" , shared_clean );
325 SCAN("Shared_Dirty:" , shared_dirty );
326 SCAN("Private_Clean:", private_clean);
327 SCAN("Private_Dirty:", private_dirty);
329 // f7d29000-f7d39000 rw-s ADR M:m OFS FILE
330 tp = strchr(buf, '-');
334 sz = fast_strtoul_16(&tp); /* start */
335 sz = (fast_strtoul_16(&tp) - sz) >> 10; /* end - start */
336 // tp -> "rw-s" string
338 // skipping "rw-s ADR M:m OFS "
339 tp = skip_whitespace(skip_fields(tp, 4));
340 // filter out /dev/something (something != zero)
341 if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) {
344 } else if (w == '-') {
348 //else printf("DROPPING %s (%s)\n", buf, tp);
349 if (strcmp(tp, "[stack]\n") == 0)
357 #if 0 /* PSSCAN_CMD is not used */
358 if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
363 strcpy(filename_tail, "/cmdline");
364 /* TODO: to get rid of size limits, read into malloc buf,
365 * then realloc it down to real size. */
366 n = read_to_buf(filename, buf);
369 if (flags & PSSCAN_ARGV0)
370 sp->argv0 = xstrdup(buf);
371 if (flags & PSSCAN_CMD) {
374 if ((unsigned char)(buf[n]) < ' ')
377 sp->cmd = xstrdup(buf);
381 if (flags & (PSSCAN_ARGV0|PSSCAN_ARGVN)) {
384 strcpy(filename_tail, "/cmdline");
385 n = read_to_buf(filename, buf);
388 #if ENABLE_PGREP || ENABLE_PKILL
389 if (flags & PSSCAN_ARGVN) {
397 sp->argv0 = xstrdup(buf);
405 void FAST_FUNC read_cmdline(char *buf, int col, unsigned pid, const char *comm)
408 char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
410 sprintf(filename, "/proc/%u/cmdline", pid);
411 sz = open_read_close(filename, buf, col);
415 if ((unsigned char)(buf[sz]) < ' ')
418 snprintf(buf, col, "[%s]", comm);
423 // pid comm S ppid pgid sid tty_nr tty_pgrp flg
424 sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
425 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
426 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
440 cputime_to_clock_t(utime),
441 cputime_to_clock_t(stime),
442 cputime_to_clock_t(cutime),
443 cputime_to_clock_t(cstime),
450 mm ? get_mm_rss(mm) : 0,
452 mm ? mm->start_code : 0,
453 mm ? mm->end_code : 0,
454 mm ? mm->start_stack : 0,
457 the rest is some obsolete cruft