323 lines
7.7 KiB
C
323 lines
7.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright 1998 by Albert Cahalan; all rights reserved.
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* Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
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* SELinux support: (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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typedef struct unsigned_to_name_map_t {
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unsigned id;
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char name[USERNAME_MAX_SIZE];
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} unsigned_to_name_map_t;
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typedef struct cache_t {
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unsigned_to_name_map_t *cache;
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int size;
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} cache_t;
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static cache_t username, groupname;
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static void clear_cache(cache_t *cp)
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{
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free(cp->cache);
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cp->cache = NULL;
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cp->size = 0;
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}
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void clear_username_cache(void)
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{
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clear_cache(&username);
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clear_cache(&groupname);
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}
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#if 0 /* more generic, but we don't need that yet */
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/* Returns -N-1 if not found. */
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/* cp->cache[N] is allocated and must be filled in this case */
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static int get_cached(cache_t *cp, unsigned id)
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{
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int i;
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for (i = 0; i < cp->size; i++)
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if (cp->cache[i].id == id)
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return i;
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i = cp->size++;
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cp->cache = xrealloc(cp->cache, cp->size * sizeof(*cp->cache));
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cp->cache[i++].id = id;
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return -i;
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}
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#endif
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typedef char* ug_func(char *name, long uid, int bufsize);
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static char* get_cached(cache_t *cp, unsigned id, ug_func* fp)
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{
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int i;
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for (i = 0; i < cp->size; i++)
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if (cp->cache[i].id == id)
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return cp->cache[i].name;
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i = cp->size++;
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cp->cache = xrealloc(cp->cache, cp->size * sizeof(*cp->cache));
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cp->cache[i].id = id;
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fp(cp->cache[i].name, id, sizeof(cp->cache[i].name));
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return cp->cache[i].name;
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}
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const char* get_cached_username(uid_t uid)
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{
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return get_cached(&username, uid, bb_getpwuid);
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}
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const char* get_cached_groupname(gid_t gid)
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{
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return get_cached(&groupname, gid, bb_getgrgid);
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}
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#define PROCPS_BUFSIZE 1024
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static int read_to_buf(const char *filename, void *buf)
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{
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int fd;
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/* open_read_close() would do two reads, checking for EOF.
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* When you have 10000 /proc/$NUM/stat to read, it isn't desirable */
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ssize_t ret = -1;
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fd = open(filename, O_RDONLY);
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if (fd >= 0) {
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ret = read(fd, buf, PROCPS_BUFSIZE-1);
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close(fd);
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}
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((char *)buf)[ret > 0 ? ret : 0] = '\0';
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return ret;
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}
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procps_status_t* alloc_procps_scan(int flags)
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{
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procps_status_t* sp = xzalloc(sizeof(procps_status_t));
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sp->dir = xopendir("/proc");
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return sp;
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}
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void free_procps_scan(procps_status_t* sp)
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{
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closedir(sp->dir);
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free(sp->cmd);
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USE_SELINUX(free(sp->context);)
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free(sp);
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}
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#if ENABLE_FEATURE_FAST_TOP
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/* We cut a lot of corners here for speed */
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static unsigned long fast_strtoul_10(char *str, char **endptr)
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{
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char c;
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unsigned long n = *str - '0';
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while ((c = *++str) != ' ')
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n = n*10 + (c - '0');
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*endptr = str + 1; /* We skip trailing space! */
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return n;
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}
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static char *skip_fields(char *str, int count)
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{
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do {
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str = skip_non_whitespace(str); str++;
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} while (--count);
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return str;
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}
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#endif
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void BUG_comm_size(void);
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procps_status_t* procps_scan(procps_status_t* sp, int flags)
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{
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struct dirent *entry;
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char buf[PROCPS_BUFSIZE];
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char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
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char *filename_tail;
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long tasknice;
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unsigned pid;
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int n;
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struct stat sb;
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if (!sp)
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sp = alloc_procps_scan(flags);
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for (;;) {
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entry = readdir(sp->dir);
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if (entry == NULL) {
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free_procps_scan(sp);
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return NULL;
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}
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pid = bb_strtou(entry->d_name, NULL, 10);
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if (errno)
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continue;
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/* After this point we have to break, not continue
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* ("continue" would mean that current /proc/NNN
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* is not a valid process info) */
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memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
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sp->pid = pid;
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if (!(flags & ~PSSCAN_PID)) break;
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#if ENABLE_SELINUX
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if (flags & PSSCAN_CONTEXT) {
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if (getpidcon(sp->pid, &sp->context) < 0)
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sp->context = NULL;
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}
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#endif
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filename_tail = filename + sprintf(filename, "/proc/%d", pid);
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if (flags & PSSCAN_UIDGID) {
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if (stat(filename, &sb))
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break;
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/* Need comment - is this effective or real UID/GID? */
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sp->uid = sb.st_uid;
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sp->gid = sb.st_gid;
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}
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if (flags & PSSCAN_STAT) {
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char *cp;
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#if !ENABLE_FEATURE_FAST_TOP
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unsigned long vsz, rss;
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#endif
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int tty;
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/* see proc(5) for some details on this */
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strcpy(filename_tail, "/stat");
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n = read_to_buf(filename, buf);
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if (n < 0)
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break;
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cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
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if (!cp || cp[1] != ' ')
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break;
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cp[0] = '\0';
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if (sizeof(sp->comm) < 16)
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BUG_comm_size();
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sscanf(buf, "%*s (%15c", sp->comm);
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#if !ENABLE_FEATURE_FAST_TOP
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n = sscanf(cp+2,
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"%c %u " /* state, ppid */
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"%u %u %d %*s " /* pgid, sid, tty, tpgid */
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"%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
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"%lu %lu " /* utime, stime */
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"%*s %*s %*s " /* cutime, cstime, priority */
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"%ld " /* nice */
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"%*s %*s %*s " /* timeout, it_real_value, start_time */
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"%lu " /* vsize */
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"%lu " /* rss */
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/* "%lu %lu %lu %lu %lu %lu " rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
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/* "%u %u %u %u " signal, blocked, sigignore, sigcatch */
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/* "%lu %lu %lu" wchan, nswap, cnswap */
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,
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sp->state, &sp->ppid,
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&sp->pgid, &sp->sid, &tty,
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&sp->utime, &sp->stime,
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&tasknice,
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&vsz,
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&rss);
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if (n != 10)
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break;
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sp->vsz = vsz >> 10; /* vsize is in bytes and we want kb */
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sp->rss = rss >> 10;
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sp->tty_major = (tty >> 8) & 0xfff;
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sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00));
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#else
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/* This costs ~100 bytes more but makes top faster by 20%
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* If you run 10000 processes, this may be important for you */
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sp->state[0] = cp[2];
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sp->ppid = fast_strtoul_10(cp + 4, &cp);
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sp->pgid = fast_strtoul_10(cp, &cp);
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sp->sid = fast_strtoul_10(cp, &cp);
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tty = fast_strtoul_10(cp, &cp);
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sp->tty_major = (tty >> 8) & 0xfff;
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sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
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cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
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sp->utime = fast_strtoul_10(cp, &cp);
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sp->stime = fast_strtoul_10(cp, &cp);
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cp = skip_fields(cp, 3); /* cutime, cstime, priority */
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tasknice = fast_strtoul_10(cp, &cp);
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cp = skip_fields(cp, 3); /* timeout, it_real_value, start_time */
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sp->vsz = fast_strtoul_10(cp, &cp) >> 10; /* vsize is in bytes and we want kb */
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sp->rss = fast_strtoul_10(cp, &cp) >> 10;
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#endif
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if (sp->vsz == 0 && sp->state[0] != 'Z')
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sp->state[1] = 'W';
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else
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sp->state[1] = ' ';
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if (tasknice < 0)
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sp->state[2] = '<';
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else if (tasknice) /* > 0 */
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sp->state[2] = 'N';
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else
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sp->state[2] = ' ';
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}
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if (flags & PSSCAN_CMD) {
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free(sp->cmd);
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sp->cmd = NULL;
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strcpy(filename_tail, "/cmdline");
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n = read_to_buf(filename, buf);
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if (n <= 0)
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break;
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if (buf[n-1] == '\n') {
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if (!--n)
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break;
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buf[n] = '\0';
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}
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do {
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n--;
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if ((unsigned char)(buf[n]) < ' ')
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buf[n] = ' ';
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} while (n);
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sp->cmd = xstrdup(buf);
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}
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break;
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}
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return sp;
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}
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/* from kernel:
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// pid comm S ppid pgid sid tty_nr tty_pgrp flg
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sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
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%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
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%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
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task->pid,
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tcomm,
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state,
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ppid,
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pgid,
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sid,
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tty_nr,
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tty_pgrp,
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task->flags,
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min_flt,
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cmin_flt,
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maj_flt,
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cmaj_flt,
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cputime_to_clock_t(utime),
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cputime_to_clock_t(stime),
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cputime_to_clock_t(cutime),
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cputime_to_clock_t(cstime),
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priority,
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nice,
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num_threads,
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// 0,
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start_time,
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vsize,
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mm ? get_mm_rss(mm) : 0,
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rsslim,
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mm ? mm->start_code : 0,
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mm ? mm->end_code : 0,
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mm ? mm->start_stack : 0,
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esp,
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eip,
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the rest is some obsolete cruft
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*/
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