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 #include <fcntl.h>
  17
  18 #include "libbb.h"
  19
  20
  21 #define PROCPS_BUFSIZE 1024
  22
  23 static int read_to_buf(const char *filename, void *buf)
  24 {
  25         int fd;
  26         ssize_t ret;
  27
  28         fd = open(filename, O_RDONLY);
  29         if(fd < 0)
  30                 return -1;
  31         ret = read(fd, buf, PROCPS_BUFSIZE);
  32         close(fd);
  33         return ret;
  34 }
  35
  36
  37 procps_status_t * procps_scan(int save_user_arg0)
  38 {
  39         static DIR *dir;
  40         struct dirent *entry;
  41         static procps_status_t ret_status;
  42         char *name;
  43         int n;
  44         char status[32];
  45         char *status_tail;
  46         char buf[PROCPS_BUFSIZE];
  47         procps_status_t curstatus;
  48         int pid;
  49         long tasknice;
  50         struct stat sb;
  51
  52         if (!dir) {
  53                 dir = bb_xopendir("/proc");
  54         }
  55         for(;;) {
  56                 if((entry = readdir(dir)) == NULL) {
  57                         closedir(dir);
  58                         dir = 0;
  59                         return 0;
  60                 }
  61                 name = entry->d_name;
  62                 if (!(*name >= '0' && *name <= '9'))
  63                         continue;
  64
  65                 memset(&curstatus, 0, sizeof(procps_status_t));
  66                 pid = atoi(name);
  67                 curstatus.pid = pid;
  68
  69                 status_tail = status + sprintf(status, "/proc/%d", pid);
  70                 if(stat(status, &sb))
  71                         continue;
  72                 bb_getpwuid(curstatus.user, sb.st_uid, sizeof(curstatus.user));
  73
  74                 strcpy(status_tail, "/stat");
  75                 n = read_to_buf(status, buf);
  76                 if(n < 0)
  77                         continue;
  78                 name = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
  79                 if(name == 0 || name[1] != ' ')
  80                         continue;
  81                 *name = 0;
  82                 sscanf(buf, "%*s (%15c", curstatus.short_cmd);
  83                 n = sscanf(name+2,
  84                 "%c %d "
  85                 "%*s %*s %*s %*s "     /* pgrp, session, tty, tpgid */
  86                 "%*s %*s %*s %*s %*s " /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
  87 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
  88                 "%lu %lu "
  89 #else
  90                 "%*s %*s "
  91 #endif
  92                 "%*s %*s %*s "         /* cutime, cstime, priority */
  93                 "%ld "
  94                 "%*s %*s %*s "         /* timeout, it_real_value, start_time */
  95                 "%*s "                 /* vsize */
  96                 "%ld",
  97                 curstatus.state, &curstatus.ppid,
  98 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
  99                 &curstatus.utime, &curstatus.stime,
 100 #endif
 101                 &tasknice,
 102                 &curstatus.rss);
 103 #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 104                 if(n != 6)
 105 #else
 106                 if(n != 4)
 107 #endif
 108                         continue;
 109
 110                 if (curstatus.rss == 0 && curstatus.state[0] != 'Z')
 111                         curstatus.state[1] = 'W';
 112                 else
 113                         curstatus.state[1] = ' ';
 114                 if (tasknice < 0)
 115                         curstatus.state[2] = '<';
 116                 else if (tasknice > 0)
 117                         curstatus.state[2] = 'N';
 118                 else
 119                         curstatus.state[2] = ' ';
 120
 121 #ifdef PAGE_SHIFT
 122                 curstatus.rss <<= (PAGE_SHIFT - 10);     /* 2**10 = 1kb */
 123 #else
 124                 curstatus.rss *= (getpagesize() >> 10);     /* 2**10 = 1kb */
 125 #endif
 126
 127                 if(save_user_arg0) {
 128                         strcpy(status_tail, "/cmdline");
 129                         n = read_to_buf(status, buf);
 130                         if(n > 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                 }
 146                 return memcpy(&ret_status, &curstatus, sizeof(procps_status_t));
 147         }
 148 }
 149
 150 /* END CODE */
 151 /*
 152 Local Variables:
 153 c-file-style: "linux"
 154 c-basic-offset: 4
 155 tab-width: 4
 156 End:
 157 */