*
* Copyright 1998 by Albert Cahalan; all rights reserved.
* Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
- * GNU Library General Public License Version 2, or any later version
+ * SELinux support: (c) 2007 by Yuichi Nakamura <ynakam@hitachisoft.jp>
*
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#include <dirent.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <asm/page.h>
-
#include "libbb.h"
-extern procps_status_t * procps_scan(int save_user_arg0
-#ifdef CONFIG_SELINUX
- , int use_selinux , security_id_t *sid
+
+typedef struct id_to_name_map_t {
+ uid_t id;
+ char name[USERNAME_MAX_SIZE];
+} id_to_name_map_t;
+
+typedef struct cache_t {
+ id_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 FAST_FUNC 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, uid_t id)
+{
+ int i;
+ for (i = 0; i < cp->size; i++)
+ if (cp->cache[i].id == id)
+ return i;
+ i = cp->size++;
+ cp->cache = xrealloc_vector(cp->cache, 2, i);
+ cp->cache[i++].id = id;
+ return -i;
+}
#endif
- )
-{
- static DIR *dir;
- struct dirent *entry;
- static procps_status_t ret_status;
- char *name;
- int n;
- char status[32];
- char buf[1024];
- FILE *fp;
- procps_status_t curstatus;
- int pid;
- long tasknice;
- struct stat sb;
-
- if (!dir) {
- dir = opendir("/proc");
- if(!dir)
- bb_error_msg_and_die("Can't open /proc");
+
+static char* get_cached(cache_t *cp, uid_t id,
+ char* FAST_FUNC x2x_utoa(uid_t id))
+{
+ 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_vector(cp->cache, 2, i);
+ cp->cache[i].id = id;
+ /* Never fails. Generates numeric string if name isn't found */
+ safe_strncpy(cp->cache[i].name, x2x_utoa(id), sizeof(cp->cache[i].name));
+ return cp->cache[i].name;
+}
+const char* FAST_FUNC get_cached_username(uid_t uid)
+{
+ return get_cached(&username, uid, uid2uname_utoa);
+}
+const char* FAST_FUNC get_cached_groupname(gid_t gid)
+{
+ return get_cached(&groupname, gid, gid2group_utoa);
+}
+
+
+#define PROCPS_BUFSIZE 1024
+
+static int read_to_buf(const char *filename, void *buf)
+{
+ int fd;
+ /* 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) {
+ ret = read(fd, buf, PROCPS_BUFSIZE-1);
+ close(fd);
}
- for(;;) {
- if((entry = readdir(dir)) == NULL) {
- closedir(dir);
- dir = 0;
- return 0;
- }
- name = entry->d_name;
- if (!(*name >= '0' && *name <= '9'))
- continue;
+ ((char *)buf)[ret > 0 ? ret : 0] = '\0';
+ return ret;
+}
- memset(&curstatus, 0, sizeof(procps_status_t));
- pid = atoi(name);
- curstatus.pid = pid;
+static procps_status_t* FAST_FUNC alloc_procps_scan(void)
+{
+ 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;
+}
- sprintf(status, "/proc/%d", pid);
- if(stat(status, &sb))
- continue;
- my_getpwuid(curstatus.user, sb.st_uid, sizeof(curstatus.user));
+void FAST_FUNC free_procps_scan(procps_status_t* sp)
+{
+ closedir(sp->dir);
+#if ENABLE_FEATURE_SHOW_THREADS
+ if (sp->task_dir)
+ closedir(sp->task_dir);
+#endif
+ free(sp->argv0);
+ free(sp->exe);
+ IF_SELINUX(free(sp->context);)
+ free(sp);
+}
+
+#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
+static unsigned long fast_strtoul_16(char **endptr)
+{
+ unsigned char c;
+ char *str = *endptr;
+ unsigned long n = 0;
+
+ /* Need to stop on both ' ' and '\n' */
+ 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;
+}
+#endif
+
+#if ENABLE_FEATURE_FAST_TOP || ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
+/* We cut a lot of corners here for speed */
+static unsigned long fast_strtoul_10(char **endptr)
+{
+ unsigned char c;
+ char *str = *endptr;
+ unsigned long n = *str - '0';
+
+ /* Need to stop on both ' ' and '\n' */
+ while ((c = *++str) > ' ')
+ n = n*10 + (c - '0');
+
+ *endptr = str + 1; /* We skip trailing space! */
+ return n;
+}
+
+# if ENABLE_FEATURE_FAST_TOP
+static long fast_strtol_10(char **endptr)
+{
+ if (**endptr != '-')
+ return fast_strtoul_10(endptr);
+
+ (*endptr)++;
+ return - (long)fast_strtoul_10(endptr);
+}
+# endif
- sprintf(status, "/proc/%d/stat", pid);
- if((fp = fopen(status, "r")) == NULL)
+static char *skip_fields(char *str, int count)
+{
+ do {
+ while (*str++ != ' ')
continue;
-#ifdef CONFIG_SELINUX
- if(use_selinux)
- {
- if(fstat_secure(fileno(fp), &sb, sid))
- continue;
+ /* we found a space char, str points after it */
+ } while (--count);
+ return str;
+}
+#endif
+
+#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
+int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
+ void (*cb)(struct smaprec *, void *), void *data)
+{
+ FILE *file;
+ struct smaprec currec;
+ char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
+ char buf[PROCPS_BUFSIZE];
+#if !ENABLE_PMAP
+ void (*cb)(struct smaprec *, void *) = NULL;
+ void *data = NULL;
+#endif
+
+ sprintf(filename, "/proc/%u/smaps", (int)pid);
+
+ file = fopen_for_read(filename);
+ if (!file)
+ return 1;
+
+ memset(&currec, 0, sizeof(currec));
+ while (fgets(buf, PROCPS_BUFSIZE, file)) {
+ // Each mapping datum has this form:
+ // f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
+ // Size: nnn kB
+ // Rss: nnn kB
+ // .....
+
+ char *tp = buf, *p;
+
+#define SCAN(S, X) \
+ if (strncmp(tp, S, sizeof(S)-1) == 0) { \
+ tp = skip_whitespace(tp + sizeof(S)-1); \
+ total->X += currec.X = fast_strtoul_10(&tp); \
+ continue; \
+ }
+ if (cb) {
+ SCAN("Pss:" , smap_pss );
+ SCAN("Swap:" , smap_swap );
+ }
+ SCAN("Private_Dirty:", private_dirty);
+ SCAN("Private_Clean:", private_clean);
+ SCAN("Shared_Dirty:" , shared_dirty );
+ SCAN("Shared_Clean:" , shared_clean );
+#undef SCAN
+ tp = strchr(buf, '-');
+ if (tp) {
+ // We reached next mapping - the line of this form:
+ // f7d29000-f7d39000 rw-s FILEOFS M:m INODE FILENAME
+
+ if (cb) {
+ /* If we have a previous record, there's nothing more
+ * for it, call the callback and clear currec
+ */
+ if (currec.smap_size)
+ cb(&currec, data);
+ free(currec.smap_name);
+ }
+ memset(&currec, 0, sizeof(currec));
+
+ *tp = ' ';
+ tp = buf;
+ currec.smap_start = fast_strtoul_16(&tp);
+ currec.smap_size = (fast_strtoul_16(&tp) - currec.smap_start) >> 10;
+
+ strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
+
+ // skipping "rw-s FILEOFS M:m INODE "
+ 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 (currec.smap_mode[1] == 'w') {
+ currec.mapped_rw = currec.smap_size;
+ total->mapped_rw += currec.smap_size;
+ } else if (currec.smap_mode[1] == '-') {
+ currec.mapped_ro = currec.smap_size;
+ total->mapped_ro += currec.smap_size;
+ }
+ }
+
+ if (strcmp(tp, "[stack]\n") == 0)
+ total->stack += currec.smap_size;
+ if (cb) {
+ p = skip_non_whitespace(tp);
+ if (p == tp) {
+ currec.smap_name = xstrdup(" [ anon ]");
+ } else {
+ *p = '\0';
+ currec.smap_name = xstrdup(tp);
+ }
+ }
+ total->smap_size += currec.smap_size;
+ }
+ }
+ fclose(file);
+
+ if (cb) {
+ if (currec.smap_size)
+ cb(&currec, data);
+ free(currec.smap_name);
+ }
+
+ return 0;
+}
+#endif
+
+void BUG_comm_size(void);
+procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
+{
+ if (!sp)
+ sp = alloc_procps_scan();
+
+ for (;;) {
+ struct dirent *entry;
+ char buf[PROCPS_BUFSIZE];
+ long tasknice;
+ unsigned pid;
+ int n;
+ char filename[sizeof("/proc/%u/task/%u/cmdline") + sizeof(int)*3 * 2];
+ char *filename_tail;
+
+#if ENABLE_FEATURE_SHOW_THREADS
+ if (sp->task_dir) {
+ entry = readdir(sp->task_dir);
+ if (entry)
+ goto got_entry;
+ closedir(sp->task_dir);
+ sp->task_dir = NULL;
}
- else
#endif
- name = fgets(buf, sizeof(buf), fp);
- fclose(fp);
- if(name == NULL)
+ entry = readdir(sp->dir);
+ if (entry == NULL) {
+ free_procps_scan(sp);
+ return NULL;
+ }
+ IF_FEATURE_SHOW_THREADS(got_entry:)
+ pid = bb_strtou(entry->d_name, NULL, 10);
+ if (errno)
continue;
- name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
- if(name == 0 || name[1] != ' ')
+#if ENABLE_FEATURE_SHOW_THREADS
+ if ((flags & PSSCAN_TASKS) && !sp->task_dir) {
+ /* We found another /proc/PID. Do not use it,
+ * there will be /proc/PID/task/PID (same PID!),
+ * so just go ahead and dive into /proc/PID/task. */
+ sprintf(filename, "/proc/%u/task", pid);
+ /* Note: if opendir fails, we just go to next /proc/XXX */
+ sp->task_dir = opendir(filename);
+ sp->main_thread_pid = pid;
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 FEATURE_CPU_USAGE_PERCENTAGE
- "%lu %lu "
-#else
- "%*s %*s "
-#endif
- "%*s %*s %*s " /* cutime, cstime, priority */
- "%ld "
- "%*s %*s %*s " /* timeout, it_real_value, start_time */
- "%*s " /* vsize */
- "%ld",
- curstatus.state, &curstatus.ppid,
-#ifdef FEATURE_CPU_USAGE_PERCENTAGE
- &curstatus.utime, &curstatus.stime,
+ }
#endif
- &tasknice,
- &curstatus.rss);
-#ifdef FEATURE_CPU_USAGE_PERCENTAGE
- if(n != 6)
-#else
- if(n != 4)
+
+ /* After this point we can:
+ * "break": stop parsing, return the data
+ * "continue": try next /proc/XXX
+ */
+
+ memset(&sp->vsz, 0, sizeof(*sp) - offsetof(procps_status_t, vsz));
+
+ sp->pid = pid;
+ if (!(flags & ~PSSCAN_PID))
+ break; /* we needed only pid, we got it */
+
+#if ENABLE_SELINUX
+ if (flags & PSSCAN_CONTEXT) {
+ if (getpidcon(sp->pid, &sp->context) < 0)
+ sp->context = NULL;
+ }
#endif
- continue;
- if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
- curstatus.state[1] = 'W';
+#if ENABLE_FEATURE_SHOW_THREADS
+ if (sp->task_dir)
+ filename_tail = filename + sprintf(filename, "/proc/%u/task/%u/", sp->main_thread_pid, pid);
else
- curstatus.state[1] = ' ';
- if (tasknice < 0)
- curstatus.state[2] = '<';
- else if (tasknice > 0)
- curstatus.state[2] = 'N';
- else
- curstatus.state[2] = ' ';
+#endif
+ filename_tail = filename + sprintf(filename, "/proc/%u/", pid);
-#ifdef PAGE_SHIFT
- curstatus.rss <<= (PAGE_SHIFT - 10); /* 2**10 = 1kb */
+ if (flags & PSSCAN_UIDGID) {
+ struct stat sb;
+ if (stat(filename, &sb))
+ continue; /* process probably exited */
+ /* Effective UID/GID, not real */
+ sp->uid = sb.st_uid;
+ sp->gid = sb.st_gid;
+ }
+
+ /* These are all retrieved from proc/NN/stat in one go: */
+ if (flags & (PSSCAN_PPID | PSSCAN_PGID | PSSCAN_SID
+ | PSSCAN_COMM | PSSCAN_STATE
+ | PSSCAN_VSZ | PSSCAN_RSS
+ | PSSCAN_STIME | PSSCAN_UTIME | PSSCAN_START_TIME
+ | PSSCAN_TTY | PSSCAN_NICE
+ | PSSCAN_CPU)
+ ) {
+ char *cp, *comm1;
+ int tty;
+#if !ENABLE_FEATURE_FAST_TOP
+ unsigned long vsz, rss;
+#endif
+ /* see proc(5) for some details on this */
+ strcpy(filename_tail, "stat");
+ n = read_to_buf(filename, buf);
+ if (n < 0)
+ continue; /* process probably exited */
+ cp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
+ /*if (!cp || cp[1] != ' ')
+ continue;*/
+ 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 */
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
+ "%*s %*s %*s %*s %*s %*s " /*rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
+ "%*s %*s %*s %*s " /*signal, blocked, sigignore, sigcatch */
+ "%*s %*s %*s %*s " /*wchan, nswap, cnswap, exit_signal */
+ "%d" /*cpu last seen on*/
+# endif
+ ,
+ sp->state, &sp->ppid,
+ &sp->pgid, &sp->sid, &tty,
+ &sp->utime, &sp->stime,
+ &tasknice,
+ &sp->start_time,
+ &vsz,
+ &rss
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
+ , &sp->last_seen_on_cpu
+# endif
+ );
+
+ if (n < 11)
+ continue; /* bogus data, get next /proc/XXX */
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
+ if (n == 11)
+ sp->last_seen_on_cpu = 0;
+# endif
+
+ /* 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_strtol_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;
+# if ENABLE_FEATURE_TOP_SMP_PROCESS
+ /* (6): rss_rlim, start_code, end_code, start_stack, kstk_esp, kstk_eip */
+ /* (4): signal, blocked, sigignore, sigcatch */
+ /* (4): wchan, nswap, cnswap, exit_signal */
+ cp = skip_fields(cp, 14);
+//FIXME: is it safe to assume this field exists?
+ sp->last_seen_on_cpu = fast_strtoul_10(&cp);
+# endif
+#endif /* FEATURE_FAST_TOP */
+
+#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
+ sp->niceness = tasknice;
#endif
- if(save_user_arg0) {
- sprintf(status, "/proc/%d/cmdline", pid);
- if((fp = fopen(status, "r")) == NULL)
- continue;
- if((n=fread(buf, 1, sizeof(buf)-1, fp)) > 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)
+ 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 (strncmp(buf, str, sizeof(str)-1) == 0) { \
+ tp = skip_whitespace(buf + sizeof(str)-1); \
+ sscanf(tp, "%u", &sp->name); \
+ statement; \
+ }
+ SCAN_TWO("Uid:", ruid, continue);
+ SCAN_TWO("Gid:", rgid, break);
+#undef SCAN_TWO
}
- *name = 0;
- if(buf[0])
- curstatus.cmd = strdup(buf);
- /* if NULL it work true also */
+ 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);
}
- fclose(fp);
}
- return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
+#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 = xmalloc(n + 1);
+ memcpy(sp->argv0, 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 comm differs from argv0, prepend "{comm} ".
+ * It allows to see thread names set by prctl(PR_SET_NAME).
+ */
+ if (base[0] == '-') /* "-sh" (login shell)? */
+ base++;
+ 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);
}
}
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
+/* 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 / platform / upstream / busybox.git / blobdiff