661 lines
17 KiB
C
661 lines
17 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 source tree.
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*/
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#include "libbb.h"
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typedef struct id_to_name_map_t {
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uid_t id;
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char name[USERNAME_MAX_SIZE];
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} id_to_name_map_t;
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typedef struct cache_t {
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id_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 FAST_FUNC 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, uid_t 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_vector(cp->cache, 2, i);
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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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static char* get_cached(cache_t *cp, uid_t id,
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char* FAST_FUNC x2x_utoa(uid_t 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 cp->cache[i].name;
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i = cp->size++;
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cp->cache = xrealloc_vector(cp->cache, 2, i);
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cp->cache[i].id = id;
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/* Never fails. Generates numeric string if name isn't found */
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safe_strncpy(cp->cache[i].name, x2x_utoa(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* FAST_FUNC get_cached_username(uid_t uid)
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{
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return get_cached(&username, uid, uid2uname_utoa);
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}
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const char* FAST_FUNC get_cached_groupname(gid_t gid)
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{
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return get_cached(&groupname, gid, gid2group_utoa);
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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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static procps_status_t* FAST_FUNC alloc_procps_scan(void)
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{
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unsigned n = getpagesize();
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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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while (1) {
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n >>= 1;
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if (!n) break;
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sp->shift_pages_to_bytes++;
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}
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sp->shift_pages_to_kb = sp->shift_pages_to_bytes - 10;
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return sp;
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}
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void FAST_FUNC free_procps_scan(procps_status_t* sp)
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{
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closedir(sp->dir);
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#if ENABLE_FEATURE_SHOW_THREADS
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if (sp->task_dir)
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closedir(sp->task_dir);
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#endif
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free(sp->argv0);
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free(sp->exe);
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IF_SELINUX(free(sp->context);)
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free(sp);
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}
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#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
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static unsigned long long fast_strtoull_16(char **endptr)
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{
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unsigned char c;
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char *str = *endptr;
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unsigned long long n = 0;
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/* Need to stop on both ' ' and '\n' */
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while ((c = *str++) > ' ') {
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c = ((c|0x20) - '0');
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if (c > 9)
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/* c = c + '0' - 'a' + 10: */
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c = c - ('a' - '0' - 10);
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n = n*16 + c;
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}
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*endptr = str; /* We skip trailing space! */
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return n;
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}
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#endif
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#if ENABLE_FEATURE_FAST_TOP || ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
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/* We cut a lot of corners here for speed */
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static unsigned long fast_strtoul_10(char **endptr)
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{
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unsigned char c;
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char *str = *endptr;
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unsigned long n = *str - '0';
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/* Need to stop on both ' ' and '\n' */
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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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# if ENABLE_FEATURE_FAST_TOP
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static long fast_strtol_10(char **endptr)
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{
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if (**endptr != '-')
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return fast_strtoul_10(endptr);
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(*endptr)++;
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return - (long)fast_strtoul_10(endptr);
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}
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# endif
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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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while (*str++ != ' ')
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continue;
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/* we found a space char, str points after it */
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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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#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
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int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
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void (*cb)(struct smaprec *, void *), void *data)
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{
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FILE *file;
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struct smaprec currec;
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char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
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char buf[PROCPS_BUFSIZE];
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#if !ENABLE_PMAP
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void (*cb)(struct smaprec *, void *) = NULL;
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void *data = NULL;
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#endif
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sprintf(filename, "/proc/%u/smaps", (int)pid);
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file = fopen_for_read(filename);
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if (!file)
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return 1;
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memset(&currec, 0, sizeof(currec));
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while (fgets(buf, PROCPS_BUFSIZE, file)) {
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// Each mapping datum has this form:
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// f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
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// Size: nnn kB
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// Rss: nnn kB
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// .....
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char *tp, *p;
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#define SCAN(S, X) \
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if ((tp = is_prefixed_with(buf, S)) != NULL) { \
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tp = skip_whitespace(tp); \
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total->X += currec.X = fast_strtoul_10(&tp); \
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continue; \
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}
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if (cb) {
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SCAN("Pss:" , smap_pss );
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SCAN("Swap:" , smap_swap );
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}
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SCAN("Private_Dirty:", private_dirty);
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SCAN("Private_Clean:", private_clean);
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SCAN("Shared_Dirty:" , shared_dirty );
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SCAN("Shared_Clean:" , shared_clean );
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#undef SCAN
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tp = strchr(buf, '-');
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if (tp) {
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// We reached next mapping - the line of this form:
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// f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
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if (cb) {
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/* If we have a previous record, there's nothing more
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* for it, call the callback and clear currec
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*/
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if (currec.smap_size)
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cb(&currec, data);
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free(currec.smap_name);
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}
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memset(&currec, 0, sizeof(currec));
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*tp = ' ';
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tp = buf;
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currec.smap_start = fast_strtoull_16(&tp);
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currec.smap_size = (fast_strtoull_16(&tp) - currec.smap_start) >> 10;
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strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
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// skipping "rw-s FILEOFS M:m INODE "
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tp = skip_whitespace(skip_fields(tp, 4));
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// filter out /dev/something (something != zero)
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if (!is_prefixed_with(tp, "/dev/") || strcmp(tp, "/dev/zero\n") == 0) {
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if (currec.smap_mode[1] == 'w') {
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currec.mapped_rw = currec.smap_size;
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total->mapped_rw += currec.smap_size;
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} else if (currec.smap_mode[1] == '-') {
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currec.mapped_ro = currec.smap_size;
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total->mapped_ro += currec.smap_size;
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}
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}
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if (strcmp(tp, "[stack]\n") == 0)
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total->stack += currec.smap_size;
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if (cb) {
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p = skip_non_whitespace(tp);
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if (p == tp) {
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currec.smap_name = xstrdup(" [ anon ]");
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} else {
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*p = '\0';
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currec.smap_name = xstrdup(tp);
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}
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}
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total->smap_size += currec.smap_size;
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}
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}
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fclose(file);
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if (cb) {
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if (currec.smap_size)
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cb(&currec, data);
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free(currec.smap_name);
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}
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return 0;
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}
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#endif
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procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
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{
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if (!sp)
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sp = alloc_procps_scan();
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for (;;) {
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struct dirent *entry;
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char buf[PROCPS_BUFSIZE];
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long tasknice;
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unsigned pid;
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int n;
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char filename[sizeof("/proc/%u/task/%u/cmdline") + sizeof(int)*3 * 2];
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char *filename_tail;
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#if ENABLE_FEATURE_SHOW_THREADS
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if (sp->task_dir) {
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entry = readdir(sp->task_dir);
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if (entry)
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goto got_entry;
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closedir(sp->task_dir);
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sp->task_dir = NULL;
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}
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#endif
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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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IF_FEATURE_SHOW_THREADS(got_entry:)
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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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#if ENABLE_FEATURE_SHOW_THREADS
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if ((flags & PSSCAN_TASKS) && !sp->task_dir) {
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/* We found another /proc/PID. Do not use it,
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* there will be /proc/PID/task/PID (same PID!),
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* so just go ahead and dive into /proc/PID/task. */
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sprintf(filename, "/proc/%u/task", pid);
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/* Note: if opendir fails, we just go to next /proc/XXX */
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sp->task_dir = opendir(filename);
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sp->main_thread_pid = pid;
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continue;
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}
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#endif
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/* After this point we can:
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* "break": stop parsing, return the data
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* "continue": try next /proc/XXX
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*/
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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))
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break; /* we needed only pid, we got it */
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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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#if ENABLE_FEATURE_SHOW_THREADS
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if (sp->task_dir)
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filename_tail = filename + sprintf(filename, "/proc/%u/task/%u/", sp->main_thread_pid, pid);
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else
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#endif
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filename_tail = filename + sprintf(filename, "/proc/%u/", pid);
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if (flags & PSSCAN_UIDGID) {
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struct stat sb;
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if (stat(filename, &sb))
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continue; /* process probably exited */
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/* Effective UID/GID, not real */
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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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/* These are all retrieved from proc/NN/stat in one go: */
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if (flags & (PSSCAN_PPID | PSSCAN_PGID | PSSCAN_SID
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| PSSCAN_COMM | PSSCAN_STATE
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| PSSCAN_VSZ | PSSCAN_RSS
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| PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_START_TIME
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| PSSCAN_TTY | PSSCAN_NICE
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| PSSCAN_CPU)
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) {
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int s_idx;
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char *cp, *comm1;
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int tty;
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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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/* 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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continue; /* process probably exited */
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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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continue;*/
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cp[0] = '\0';
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BUILD_BUG_ON(sizeof(sp->comm) < 16);
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comm1 = strchr(buf, '(');
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/*if (comm1)*/
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safe_strncpy(sp->comm, comm1 + 1, sizeof(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 " /* timeout, it_real_value */
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"%lu " /* start_time */
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"%lu " /* vsize */
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"%lu " /* rss */
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# if ENABLE_FEATURE_TOP_SMP_PROCESS
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"%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
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"%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */
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"%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */
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"%d" /*cpu last seen on*/
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# endif
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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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&sp->start_time,
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&vsz,
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&rss
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# if ENABLE_FEATURE_TOP_SMP_PROCESS
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, &sp->last_seen_on_cpu
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# endif
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);
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if (n < 11)
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continue; /* bogus data, get next /proc/XXX */
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# if ENABLE_FEATURE_TOP_SMP_PROCESS
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if (n == 11)
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sp->last_seen_on_cpu = 0;
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# endif
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/* vsz is in bytes and we want kb */
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sp->vsz = vsz >> 10;
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/* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
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sp->rss = rss << sp->shift_pages_to_kb;
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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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cp += 4;
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sp->ppid = fast_strtoul_10(&cp);
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sp->pgid = fast_strtoul_10(&cp);
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sp->sid = fast_strtoul_10(&cp);
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tty = fast_strtoul_10(&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);
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sp->stime = fast_strtoul_10(&cp);
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cp = skip_fields(cp, 3); /* cutime, cstime, priority */
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tasknice = fast_strtol_10(&cp);
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cp = skip_fields(cp, 2); /* timeout, it_real_value */
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sp->start_time = fast_strtoul_10(&cp);
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/* vsz is in bytes and we want kb */
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sp->vsz = fast_strtoul_10(&cp) >> 10;
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/* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
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sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
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# if ENABLE_FEATURE_TOP_SMP_PROCESS
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/* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
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/* (4): signal, blocked, sigignore, sigcatch */
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/* (4): wchan, nswap, cnswap, exit_signal */
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cp = skip_fields(cp, 14);
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//FIXME: is it safe to assume this field exists?
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sp->last_seen_on_cpu = fast_strtoul_10(&cp);
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# endif
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#endif /* FEATURE_FAST_TOP */
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#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
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sp->niceness = tasknice;
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#endif
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sp->state[1] = ' ';
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sp->state[2] = ' ';
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s_idx = 1;
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if (sp->vsz == 0 && sp->state[0] != 'Z') {
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/* not sure what the purpose of this flag */
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sp->state[1] = 'W';
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s_idx = 2;
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}
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if (tasknice != 0) {
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|
if (tasknice < 0)
|
|
sp->state[s_idx] = '<';
|
|
else /* > 0 */
|
|
sp->state[s_idx] = 'N';
|
|
}
|
|
}
|
|
|
|
#if ENABLE_FEATURE_TOPMEM
|
|
if (flags & PSSCAN_SMAPS)
|
|
procps_read_smaps(pid, &sp->smaps, NULL, NULL);
|
|
#endif /* TOPMEM */
|
|
#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
|
|
if (flags & PSSCAN_RUIDGID) {
|
|
FILE *file;
|
|
|
|
strcpy(filename_tail, "status");
|
|
file = fopen_for_read(filename);
|
|
if (file) {
|
|
while (fgets(buf, sizeof(buf), file)) {
|
|
char *tp;
|
|
#define SCAN_TWO(str, name, statement) \
|
|
if ((tp = is_prefixed_with(buf, str)) != NULL) { \
|
|
tp = skip_whitespace(tp); \
|
|
sscanf(tp, "%u", &sp->name); \
|
|
statement; \
|
|
}
|
|
SCAN_TWO("Uid:", ruid, continue);
|
|
SCAN_TWO("Gid:", rgid, break);
|
|
#undef SCAN_TWO
|
|
}
|
|
fclose(file);
|
|
}
|
|
}
|
|
#endif /* PS_ADDITIONAL_COLUMNS */
|
|
if (flags & PSSCAN_EXE) {
|
|
strcpy(filename_tail, "exe");
|
|
free(sp->exe);
|
|
sp->exe = xmalloc_readlink(filename);
|
|
}
|
|
/* Note: if /proc/PID/cmdline is empty,
|
|
* code below "breaks". Therefore it must be
|
|
* the last code to parse /proc/PID/xxx data
|
|
* (we used to have /proc/PID/exe parsing after it
|
|
* and were getting stale sp->exe).
|
|
*/
|
|
#if 0 /* PSSCAN_CMD is not used */
|
|
if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
|
|
free(sp->argv0);
|
|
sp->argv0 = NULL;
|
|
free(sp->cmd);
|
|
sp->cmd = NULL;
|
|
strcpy(filename_tail, "cmdline");
|
|
/* TODO: to get rid of size limits, read into malloc buf,
|
|
* then realloc it down to real size. */
|
|
n = read_to_buf(filename, buf);
|
|
if (n <= 0)
|
|
break;
|
|
if (flags & PSSCAN_ARGV0)
|
|
sp->argv0 = xstrdup(buf);
|
|
if (flags & PSSCAN_CMD) {
|
|
do {
|
|
n--;
|
|
if ((unsigned char)(buf[n]) < ' ')
|
|
buf[n] = ' ';
|
|
} while (n);
|
|
sp->cmd = xstrdup(buf);
|
|
}
|
|
}
|
|
#else
|
|
if (flags & (PSSCAN_ARGV0|PSSCAN_ARGVN)) {
|
|
free(sp->argv0);
|
|
sp->argv0 = NULL;
|
|
strcpy(filename_tail, "cmdline");
|
|
n = read_to_buf(filename, buf);
|
|
if (n <= 0)
|
|
break;
|
|
if (flags & PSSCAN_ARGVN) {
|
|
sp->argv_len = n;
|
|
sp->argv0 = xmemdup(buf, n + 1);
|
|
/* sp->argv0[n] = '\0'; - buf has it */
|
|
} else {
|
|
sp->argv_len = 0;
|
|
sp->argv0 = xstrdup(buf);
|
|
}
|
|
}
|
|
#endif
|
|
break;
|
|
} /* for (;;) */
|
|
|
|
return sp;
|
|
}
|
|
|
|
void FAST_FUNC read_cmdline(char *buf, int col, unsigned pid, const char *comm)
|
|
{
|
|
int sz;
|
|
char filename[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
|
|
|
|
sprintf(filename, "/proc/%u/cmdline", pid);
|
|
sz = open_read_close(filename, buf, col - 1);
|
|
if (sz > 0) {
|
|
const char *base;
|
|
int comm_len;
|
|
|
|
buf[sz] = '\0';
|
|
while (--sz >= 0 && buf[sz] == '\0')
|
|
continue;
|
|
/* Prevent basename("process foo/bar") = "bar" */
|
|
strchrnul(buf, ' ')[0] = '\0';
|
|
base = bb_basename(buf); /* before we replace argv0's NUL with space */
|
|
while (sz >= 0) {
|
|
if ((unsigned char)(buf[sz]) < ' ')
|
|
buf[sz] = ' ';
|
|
sz--;
|
|
}
|
|
if (base[0] == '-') /* "-sh" (login shell)? */
|
|
base++;
|
|
|
|
/* If comm differs from argv0, prepend "{comm} ".
|
|
* It allows to see thread names set by prctl(PR_SET_NAME).
|
|
*/
|
|
if (!comm)
|
|
return;
|
|
comm_len = strlen(comm);
|
|
/* Why compare up to comm_len, not COMM_LEN-1?
|
|
* Well, some processes rewrite argv, and use _spaces_ there
|
|
* while rewriting. (KDE is observed to do it).
|
|
* I prefer to still treat argv0 "process foo bar"
|
|
* as 'equal' to comm "process".
|
|
*/
|
|
if (strncmp(base, comm, comm_len) != 0) {
|
|
comm_len += 3;
|
|
if (col > comm_len)
|
|
memmove(buf + comm_len, buf, col - comm_len);
|
|
snprintf(buf, col, "{%s}", comm);
|
|
if (col <= comm_len)
|
|
return;
|
|
buf[comm_len - 1] = ' ';
|
|
buf[col - 1] = '\0';
|
|
}
|
|
} else {
|
|
snprintf(buf, col, "[%s]", comm ? comm : "?");
|
|
}
|
|
}
|
|
|
|
/* from kernel:
|
|
// pid comm S ppid pgid sid tty_nr tty_pgrp flg
|
|
sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
|
|
%lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
|
|
%lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %lu %llu\n",
|
|
task->pid,
|
|
tcomm,
|
|
state,
|
|
ppid,
|
|
pgid,
|
|
sid,
|
|
tty_nr,
|
|
tty_pgrp,
|
|
task->flags,
|
|
min_flt,
|
|
cmin_flt,
|
|
maj_flt,
|
|
cmaj_flt,
|
|
cputime_to_clock_t(utime),
|
|
cputime_to_clock_t(stime),
|
|
cputime_to_clock_t(cutime),
|
|
cputime_to_clock_t(cstime),
|
|
priority,
|
|
nice,
|
|
num_threads,
|
|
// 0,
|
|
start_time,
|
|
vsize,
|
|
mm ? get_mm_rss(mm) : 0,
|
|
rsslim,
|
|
mm ? mm->start_code : 0,
|
|
mm ? mm->end_code : 0,
|
|
mm ? mm->start_stack : 0,
|
|
esp,
|
|
eip,
|
|
the rest is some obsolete cruft
|
|
*/
|