src/processes.c

   1 /**
   2  * collectd - src/processes.c
   3  * Copyright (C) 2005  Lyonel Vincent
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  *
  19  * Authors:
  20  *   Lyonel Vincent <lyonel at ezix.org>
  21  *   Florian octo Forster <octo at verplant.org>
  22  **/
  23
  24 #include "processes.h"
  25
  26 #if COLLECT_PROCESSES
  27 #define MODULE_NAME "processes"
  28
  29 #include "common.h"
  30 #include "plugin.h"
  31
  32 static char *ps_file = "processes.rrd";
  33
  34 static char *ds_def[] =
  35 {
  36         "DS:running:GAUGE:25:0:65535",
  37         "DS:sleeping:GAUGE:25:0:65535",
  38         "DS:zombies:GAUGE:25:0:65535",
  39         "DS:stopped:GAUGE:25:0:65535",
  40         "DS:paging:GAUGE:25:0:65535",
  41         "DS:blocked:GAUGE:25:0:65535",
  42         NULL
  43 };
  44 static int ds_num = 6;
  45
  46 void ps_init (void)
  47 {
  48 }
  49
  50 void ps_write (char *host, char *inst, char *val)
  51 {
  52         rrd_update_file (host, ps_file, val, ds_def, ds_num);
  53 }
  54
  55 #define BUFSIZE 256
  56 void ps_submit (unsigned int running,
  57                 unsigned int sleeping,
  58                 unsigned int zombies,
  59                 unsigned int stopped,
  60                 unsigned int paging,
  61                 unsigned int blocked)
  62 {
  63         char buf[BUFSIZE];
  64
  65         if (snprintf (buf, BUFSIZE, "%u:%u:%u:%u:%u:%u:%u",
  66                                 (unsigned int) curtime,
  67                                 running, sleeping, zombies, stopped, paging,
  68                                 blocked) >= BUFSIZE)
  69                 return;
  70
  71         plugin_submit (MODULE_NAME, "-", buf);
  72 }
  73
  74 void ps_read (void)
  75 {
  76 #ifdef KERNEL_LINUX
  77         unsigned int running, sleeping, zombies, stopped, paging, blocked;
  78
  79         char buf[BUFSIZE];
  80         char filename[20]; /* need 17 bytes */
  81         char *fields[256];
  82
  83         struct dirent *ent;
  84         DIR *proc;
  85         FILE *fh;
  86
  87         running = sleeping = zombies = stopped = paging = blocked = 0;
  88
  89         if ((proc = opendir ("/proc")) == NULL)
  90         {
  91                 syslog (LOG_ERR, "Cannot open `/proc': %s", strerror (errno));
  92                 return;
  93         }
  94
  95         while ((ent = readdir (proc)) != NULL)
  96         {
  97                 if (!isdigit (ent->d_name[0]))
  98                         continue;
  99
 100                 if (snprintf (filename, 20, "/proc/%s/stat", ent->d_name) >= 20)
 101                         continue;
 102
 103                 if ((fh = fopen (filename, "r")) == NULL)
 104                 {
 105                         syslog (LOG_ERR, "Cannot open `%s': %s", filename, strerror (errno));
 106                         continue;
 107                 }
 108
 109                 if (fgets (buf, BUFSIZE, fh) == NULL)
 110                 {
 111                         fclose (fh);
 112                         continue;
 113                 }
 114
 115                 fclose (fh);
 116
 117                 if (strsplit (buf, fields, 256) < 3)
 118                         continue;
 119
 120                 switch (fields[2][0])
 121                 {
 122                         case 'R': running++;  break;
 123                         case 'S': sleeping++; break;
 124                         case 'D': blocked++;  break;
 125                         case 'Z': zombies++;  break;
 126                         case 'T': stopped++;  break;
 127                         case 'W': paging++;   break;
 128                 }
 129         }
 130
 131         closedir(proc);
 132
 133         ps_submit (running, sleeping, zombies, stopped, paging, blocked);
 134 #endif /* defined(KERNEL_LINUX) */
 135 }
 136 #undef BUFSIZE
 137
 138 void module_register (void)
 139 {
 140         plugin_register (MODULE_NAME, ps_init, ps_read, ps_write);
 141 }
 142
 143 #undef MODULE_NAME
 144 #endif /* COLLECT_PROCESSES */