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