*
* Copyright 1998 by Albert Cahalan; all rights reserved.
* Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
+ * SELinux support: (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <dirent.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/param.h>
-#include <unistd.h>
-#include <fcntl.h>
-
#include "libbb.h"
+typedef struct unsigned_to_name_map_t {
+ unsigned id;
+ char name[USERNAME_MAX_SIZE];
+} unsigned_to_name_map_t;
+
+typedef struct cache_t {
+ unsigned_to_name_map_t *cache;
+ int size;
+} cache_t;
+
+static cache_t username, groupname;
+
+static void clear_cache(cache_t *cp)
+{
+ free(cp->cache);
+ cp->cache = NULL;
+ cp->size = 0;
+}
+void clear_username_cache(void)
+{
+ clear_cache(&username);
+ clear_cache(&groupname);
+}
+
+#if 0 /* more generic, but we don't need that yet */
+/* Returns -N-1 if not found. */
+/* cp->cache[N] is allocated and must be filled in this case */
+static int get_cached(cache_t *cp, unsigned id)
+{
+ int i;
+ for (i = 0; i < cp->size; i++)
+ if (cp->cache[i].id == id)
+ return i;
+ i = cp->size++;
+ cp->cache = xrealloc(cp->cache, cp->size * sizeof(*cp->cache));
+ cp->cache[i++].id = id;
+ return -i;
+}
+#endif
+
+typedef char* ug_func(char *name, int bufsize, long uid);
+static char* get_cached(cache_t *cp, unsigned id, ug_func* fp)
+{
+ int i;
+ for (i = 0; i < cp->size; i++)
+ if (cp->cache[i].id == id)
+ return cp->cache[i].name;
+ i = cp->size++;
+ cp->cache = xrealloc(cp->cache, cp->size * sizeof(*cp->cache));
+ cp->cache[i].id = id;
+ /* Never fails. Generates numeric string if name isn't found */
+ fp(cp->cache[i].name, sizeof(cp->cache[i].name), id);
+ return cp->cache[i].name;
+}
+const char* get_cached_username(uid_t uid)
+{
+ return get_cached(&username, uid, bb_getpwuid);
+}
+const char* get_cached_groupname(gid_t gid)
+{
+ return get_cached(&groupname, gid, bb_getgrgid);
+}
+
+
#define PROCPS_BUFSIZE 1024
static int read_to_buf(const char *filename, void *buf)
{
int fd;
- ssize_t ret;
-
+ /* open_read_close() would do two reads, checking for EOF.
+ * When you have 10000 /proc/$NUM/stat to read, it isn't desirable */
+ ssize_t ret = -1;
fd = open(filename, O_RDONLY);
- if(fd < 0)
- return -1;
- ret = read(fd, buf, PROCPS_BUFSIZE-1);
- ((char *)buf)[ret > 0 ? ret : 0] = 0;
- close(fd);
+ if (fd >= 0) {
+ ret = read(fd, buf, PROCPS_BUFSIZE-1);
+ close(fd);
+ }
+ ((char *)buf)[ret > 0 ? ret : 0] = '\0';
return ret;
}
+procps_status_t *alloc_procps_scan(int flags)
+{
+ unsigned n = getpagesize();
+ procps_status_t* sp = xzalloc(sizeof(procps_status_t));
+ sp->dir = xopendir("/proc");
+ while (1) {
+ n >>= 1;
+ if (!n) break;
+ sp->shift_pages_to_bytes++;
+ }
+ sp->shift_pages_to_kb = sp->shift_pages_to_bytes - 10;
+ return sp;
+}
+
+void free_procps_scan(procps_status_t* sp)
+{
+ closedir(sp->dir);
+ free(sp->argv0);
+ USE_SELINUX(free(sp->context);)
+ free(sp);
+}
+
+#if ENABLE_FEATURE_TOPMEM
+static unsigned long fast_strtoul_16(char **endptr)
+{
+ unsigned char c;
+ char *str = *endptr;
+ unsigned long n = 0;
+
+ while ((c = *str++) != ' ') {
+ c = ((c|0x20) - '0');
+ if (c > 9)
+ // c = c + '0' - 'a' + 10:
+ c = c - ('a' - '0' - 10);
+ n = n*16 + c;
+ }
+ *endptr = str; /* We skip trailing space! */
+ return n;
+}
+/* TOPMEM uses fast_strtoul_10, so... */
+#undef ENABLE_FEATURE_FAST_TOP
+#define ENABLE_FEATURE_FAST_TOP 1
+#endif
+
+#if ENABLE_FEATURE_FAST_TOP
+/* We cut a lot of corners here for speed */
+static unsigned long fast_strtoul_10(char **endptr)
+{
+ char c;
+ char *str = *endptr;
+ unsigned long n = *str - '0';
+
+ while ((c = *++str) != ' ')
+ n = n*10 + (c - '0');
+
+ *endptr = str + 1; /* We skip trailing space! */
+ return n;
+}
+static char *skip_fields(char *str, int count)
+{
+ do {
+ while (*str++ != ' ')
+ continue;
+ /* we found a space char, str points after it */
+ } while (--count);
+ return str;
+}
+#endif
-procps_status_t * procps_scan(int save_user_arg0)
+void BUG_comm_size(void);
+procps_status_t *procps_scan(procps_status_t* sp, int flags)
{
- static DIR *dir;
struct dirent *entry;
- static procps_status_t ret_status;
- char *name;
- int n;
- char status[32];
- char *status_tail;
char buf[PROCPS_BUFSIZE];
- procps_status_t curstatus;
- int pid;
+ char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
+ char *filename_tail;
long tasknice;
+ unsigned pid;
+ int n;
struct stat sb;
- if (!dir) {
- dir = bb_xopendir("/proc");
- }
- for(;;) {
- if((entry = readdir(dir)) == NULL) {
- closedir(dir);
- dir = 0;
- return 0;
+ if (!sp)
+ sp = alloc_procps_scan(flags);
+
+ for (;;) {
+ entry = readdir(sp->dir);
+ if (entry == NULL) {
+ free_procps_scan(sp);
+ return NULL;
}
- name = entry->d_name;
- if (!(*name >= '0' && *name <= '9'))
+ pid = bb_strtou(entry->d_name, NULL, 10);
+ if (errno)
continue;
- memset(&curstatus, 0, sizeof(procps_status_t));
- pid = atoi(name);
- curstatus.pid = pid;
+ /* After this point we have to break, not continue
+ * ("continue" would mean that current /proc/NNN
+ * is not a valid process info) */
- status_tail = status + sprintf(status, "/proc/%d", pid);
- if(stat(status, &sb))
- continue;
- bb_getpwuid(curstatus.user, sb.st_uid, sizeof(curstatus.user));
+ memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
- /* see proc(5) for some details on this */
- strcpy(status_tail, "/stat");
- n = read_to_buf(status, buf);
- if(n < 0)
- continue;
- name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
- if(name == 0 || name[1] != ' ')
- continue;
- *name = 0;
- sscanf(buf, "%*s (%15c", curstatus.short_cmd);
- n = sscanf(name+2,
- "%c %d "
- "%*s %*s %*s %*s " /* pgrp, session, tty, tpgid */
- "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
-#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
- "%lu %lu " /* utime, stime */
-#else
- "%*s %*s " /* utime, stime */
-#endif
- "%*s %*s %*s " /* cutime, cstime, priority */
- "%ld " /* nice */
- "%*s %*s %*s " /* timeout, it_real_value, start_time */
- "%*s " /* vsize */
- "%ld", /* rss */
- curstatus.state, &curstatus.ppid,
-#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
- &curstatus.utime, &curstatus.stime,
+ sp->pid = pid;
+ if (!(flags & ~PSSCAN_PID)) break;
+
+#if ENABLE_SELINUX
+ if (flags & PSSCAN_CONTEXT) {
+ if (getpidcon(sp->pid, &sp->context) < 0)
+ sp->context = NULL;
+ }
#endif
- &tasknice,
- &curstatus.rss);
-#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
- if(n != 6)
-#else
- if(n != 4)
+
+ filename_tail = filename + sprintf(filename, "/proc/%d", pid);
+
+ if (flags & PSSCAN_UIDGID) {
+ if (stat(filename, &sb))
+ break;
+ /* Need comment - is this effective or real UID/GID? */
+ sp->uid = sb.st_uid;
+ sp->gid = sb.st_gid;
+ }
+
+ if (flags & PSSCAN_STAT) {
+ char *cp, *comm1;
+ int tty;
+#if !ENABLE_FEATURE_FAST_TOP
+ unsigned long vsz, rss;
#endif
- continue;
- if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
- curstatus.state[1] = 'W';
- else
- curstatus.state[1] = ' ';
- if (tasknice < 0)
- curstatus.state[2] = '<';
- else if (tasknice > 0)
- curstatus.state[2] = 'N';
- else
- curstatus.state[2] = ' ';
-
-#ifdef PAGE_SHIFT
- curstatus.rss <<= (PAGE_SHIFT - 10); /* 2**10 = 1kb */
+ /* see proc(5) for some details on this */
+ strcpy(filename_tail, "/stat");
+ n = read_to_buf(filename, buf);
+ if (n < 0)
+ break;
+ cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
+ /*if (!cp || cp[1] != ' ')
+ break;*/
+ cp[0] = '\0';
+ if (sizeof(sp->comm) < 16)
+ BUG_comm_size();
+ comm1 = strchr(buf, '(');
+ /*if (comm1)*/
+ safe_strncpy(sp->comm, comm1 + 1, sizeof(sp->comm));
+
+#if !ENABLE_FEATURE_FAST_TOP
+ n = sscanf(cp+2,
+ "%c %u " /* state, ppid */
+ "%u %u %d %*s " /* pgid, sid, tty, tpgid */
+ "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
+ "%lu %lu " /* utime, stime */
+ "%*s %*s %*s " /* cutime, cstime, priority */
+ "%ld " /* nice */
+ "%*s %*s " /* timeout, it_real_value */
+ "%lu " /* start_time */
+ "%lu " /* vsize */
+ "%lu " /* rss */
+ /* "%lu %lu %lu %lu %lu %lu " rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
+ /* "%u %u %u %u " signal, blocked, sigignore, sigcatch */
+ /* "%lu %lu %lu" wchan, nswap, cnswap */
+ ,
+ sp->state, &sp->ppid,
+ &sp->pgid, &sp->sid, &tty,
+ &sp->utime, &sp->stime,
+ &tasknice,
+ &sp->start_time,
+ &vsz,
+ &rss);
+ if (n != 10)
+ break;
+ /* vsz is in bytes and we want kb */
+ sp->vsz = vsz >> 10;
+ /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
+ sp->rss = rss << sp->shift_pages_to_kb;
+ sp->tty_major = (tty >> 8) & 0xfff;
+ sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
#else
- curstatus.rss *= (getpagesize() >> 10); /* 2**10 = 1kb */
+/* This costs ~100 bytes more but makes top faster by 20%
+ * If you run 10000 processes, this may be important for you */
+ sp->state[0] = cp[2];
+ cp += 4;
+ sp->ppid = fast_strtoul_10(&cp);
+ sp->pgid = fast_strtoul_10(&cp);
+ sp->sid = fast_strtoul_10(&cp);
+ tty = fast_strtoul_10(&cp);
+ sp->tty_major = (tty >> 8) & 0xfff;
+ sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00);
+ cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
+ sp->utime = fast_strtoul_10(&cp);
+ sp->stime = fast_strtoul_10(&cp);
+ cp = skip_fields(cp, 3); /* cutime, cstime, priority */
+ tasknice = fast_strtoul_10(&cp);
+ cp = skip_fields(cp, 2); /* timeout, it_real_value */
+ sp->start_time = fast_strtoul_10(&cp);
+ /* vsz is in bytes and we want kb */
+ sp->vsz = fast_strtoul_10(&cp) >> 10;
+ /* vsz is in bytes but rss is in *PAGES*! Can you believe that? */
+ sp->rss = fast_strtoul_10(&cp) << sp->shift_pages_to_kb;
#endif
- if(save_user_arg0) {
- strcpy(status_tail, "/cmdline");
- n = read_to_buf(status, buf);
- if(n > 0) {
- if(buf[n-1]=='\n')
- buf[--n] = 0;
- name = buf;
- while(n) {
- if(((unsigned char)*name) < ' ')
- *name = ' ';
- name++;
- n--;
+ if (sp->vsz == 0 && sp->state[0] != 'Z')
+ sp->state[1] = 'W';
+ else
+ sp->state[1] = ' ';
+ if (tasknice < 0)
+ sp->state[2] = '<';
+ else if (tasknice) /* > 0 */
+ sp->state[2] = 'N';
+ else
+ sp->state[2] = ' ';
+
+ }
+
+#if ENABLE_FEATURE_TOPMEM
+ if (flags & (PSSCAN_SMAPS)) {
+ FILE *file;
+
+ strcpy(filename_tail, "/smaps");
+ file = fopen(filename, "r");
+ if (!file)
+ break;
+ while (fgets(buf, sizeof(buf), file)) {
+ unsigned long sz;
+ char *tp;
+ char w;
+#define SCAN(str, name) \
+ if (strncmp(buf, str, sizeof(str)-1) == 0) { \
+ tp = skip_whitespace(buf + sizeof(str)-1); \
+ sp->name += fast_strtoul_10(&tp); \
+ continue; \
+ }
+ SCAN("Shared_Clean:" , shared_clean );
+ SCAN("Shared_Dirty:" , shared_dirty );
+ SCAN("Private_Clean:", private_clean);
+ SCAN("Private_Dirty:", private_dirty);
+#undef SCAN
+ // f7d29000-f7d39000 rw-s ADR M:m OFS FILE
+ tp = strchr(buf, '-');
+ if (tp) {
+ *tp = ' ';
+ tp = buf;
+ sz = fast_strtoul_16(&tp); /* start */
+ sz = (fast_strtoul_16(&tp) - sz) >> 10; /* end - start */
+ // tp -> "rw-s" string
+ w = tp[1];
+ // skipping "rw-s ADR M:m OFS "
+ tp = skip_whitespace(skip_fields(tp, 4));
+ // filter out /dev/something (something != zero)
+ if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) {
+ if (w == 'w') {
+ sp->mapped_rw += sz;
+ } else if (w == '-') {
+ sp->mapped_ro += sz;
+ }
+ }
+//else printf("DROPPING %s (%s)\n", buf, tp);
+ if (strcmp(tp, "[stack]\n") == 0)
+ sp->stack += sz;
}
- *name = 0;
- if(buf[0])
- curstatus.cmd = strdup(buf);
- /* if NULL it work true also */
}
+ fclose(file);
}
- return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
+#endif /* TOPMEM */
+
+#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 ENABLE_PGREP || ENABLE_PKILL
+ if (flags & PSSCAN_ARGVN) {
+ do {
+ n--;
+ if (buf[n] == '\0')
+ buf[n] = ' ';
+ } while (n);
+ }
+#endif
+ sp->argv0 = xstrdup(buf);
+ }
+#endif
+ break;
+ }
+ return sp;
+}
+
+void read_cmdline(char *buf, int col, unsigned pid, const char *comm)
+{
+ ssize_t sz;
+ char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
+
+ sprintf(filename, "/proc/%u/cmdline", pid);
+ sz = open_read_close(filename, buf, col);
+ if (sz > 0) {
+ buf[sz] = '\0';
+ while (--sz >= 0)
+ if ((unsigned char)(buf[sz]) < ' ')
+ buf[sz] = ' ';
+ } else {
+ snprintf(buf, col, "[%s]", 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
+*/
projects / oweals / busybox.git / blobdiff