libbb/procps.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright 1998 by Albert Cahalan; all rights reserved.
   6  * Copyright (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
   7  * GNU Library General Public License Version 2, or any later version
   8  *
   9  */
  10
  11 #include <dirent.h>
  12 #include <string.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <asm/page.h>
  16
  17 #include "libbb.h"
  18
  19 extern procps_status_t * procps_scan(int save_user_arg0
  20 #ifdef CONFIG_SELINUX
  21         , int use_selinux , security_id_t *sid
  22 #endif
  23         )
  24 {
  25         static DIR *dir;
  26         struct dirent *entry;
  27         static procps_status_t ret_status;
  28         char *name;
  29         int n;
  30         char status[32];
  31         char buf[1024];
  32         FILE *fp;
  33         procps_status_t curstatus;
  34         int pid;
  35         long tasknice;
  36         struct stat sb;
  37
  38         if (!dir) {
  39                 dir = opendir("/proc");
  40                 if(!dir)
  41                         bb_error_msg_and_die("Can't open /proc");
  42         }
  43         for(;;) {
  44                 if((entry = readdir(dir)) == NULL) {
  45                         closedir(dir);
  46                         dir = 0;
  47                         return 0;
  48                 }
  49                 name = entry->d_name;
  50                 if (!(*name >= '0' && *name <= '9'))
  51                         continue;
  52
  53                 memset(&curstatus, 0, sizeof(procps_status_t));
  54                 pid = atoi(name);
  55                 curstatus.pid = pid;
  56
  57                 sprintf(status, "/proc/%d", pid);
  58                 if(stat(status, &sb))
  59                         continue;
  60                 my_getpwuid(curstatus.user, sb.st_uid, sizeof(curstatus.user));
  61
  62                 sprintf(status, "/proc/%d/stat", pid);
  63                 if((fp = fopen(status, "r")) == NULL)
  64                         continue;
  65 #ifdef CONFIG_SELINUX
  66                 if(use_selinux)
  67                 {
  68                         if(fstat_secure(fileno(fp), &sb, sid))
  69                                 continue;
  70                 }
  71                 else
  72 #endif
  73                 name = fgets(buf, sizeof(buf), fp);
  74                 fclose(fp);
  75                 if(name == NULL)
  76                         continue;
  77                 name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
  78                 if(name == 0 || name[1] != ' ')
  79                         continue;
  80                 *name = 0;
  81                 sscanf(buf, "%*s (%15c", curstatus.short_cmd);
  82                 n = sscanf(name+2,
  83                 "%c %d "
  84                 "%*s %*s %*s %*s "     /* pgrp, session, tty, tpgid */
  85                 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
  86 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
  87                 "%lu %lu "
  88 #else
  89                 "%*s %*s "
  90 #endif
  91                 "%*s %*s %*s "         /* cutime, cstime, priority */
  92                 "%ld "
  93                 "%*s %*s %*s "         /* timeout, it_real_value, start_time */
  94                 "%*s "                 /* vsize */
  95                 "%ld",
  96                 curstatus.state, &curstatus.ppid,
  97 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
  98                 &curstatus.utime, &curstatus.stime,
  99 #endif
 100                 &tasknice,
 101                 &curstatus.rss);
 102 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
 103                 if(n != 6)
 104 #else
 105                 if(n != 4)
 106 #endif
 107                         continue;
 108
 109                 if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
 110                         curstatus.state[1] = 'W';
 111                 else
 112                         curstatus.state[1] = ' ';
 113                 if (tasknice < 0)
 114                         curstatus.state[2] = '<';
 115                 else if (tasknice > 0)
 116                         curstatus.state[2] = 'N';
 117                 else
 118                         curstatus.state[2] = ' ';
 119
 120 #ifdef PAGE_SHIFT
 121                 curstatus.rss <<= (PAGE_SHIFT - 10);     /* 2**10 = 1kb */
 122 #else
 123                 curstatus.rss *= (getpagesize() >> 10);     /* 2**10 = 1kb */
 124 #endif
 125
 126                 if(save_user_arg0) {
 127                         sprintf(status, "/proc/%d/cmdline", pid);
 128                         if((fp = fopen(status, "r")) == NULL)
 129                                 continue;
 130                         if((n=fread(buf, 1, sizeof(buf)-1, fp)) > 0) {
 131                                 if(buf[n-1]=='\n')
 132                                         buf[--n] = 0;
 133                                 name = buf;
 134                                 while(n) {
 135                                         if(((unsigned char)*name) < ' ')
 136                                                 *name = ' ';
 137                                         name++;
 138                                         n--;
 139                                 }
 140                                 *name = 0;
 141                                 if(buf[0])
 142                                         curstatus.cmd = strdup(buf);
 143                                 /* if NULL it work true also */
 144                         }
 145                         fclose(fp);
 146                 }
 147                 return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
 148         }
 149 }
 150
 151 /* END CODE */
 152 /*
 153 Local Variables:
 154 c-file-style: "linux"
 155 c-basic-offset: 4
 156 tab-width: 4
 157 End:
 158 */