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 "collectd.h"
  25 #include "common.h"
  26 #include "plugin.h"
  27
  28 #define MODULE_NAME "processes"
  29
  30 #ifdef KERNEL_LINUX
  31 # define PROCESSES_HAVE_READ 1
  32 #else
  33 # define PROCESSES_HAVE_READ 0
  34 #endif
  35
  36 static char *ps_file = "processes.rrd";
  37
  38 static char *ds_def[] =
  39 {
  40         "DS:running:GAUGE:25:0:65535",
  41         "DS:sleeping:GAUGE:25:0:65535",
  42         "DS:zombies:GAUGE:25:0:65535",
  43         "DS:stopped:GAUGE:25:0:65535",
  44         "DS:paging:GAUGE:25:0:65535",
  45         "DS:blocked:GAUGE:25:0:65535",
  46         NULL
  47 };
  48 static int ds_num = 6;
  49
  50 static void ps_init (void)
  51 {
  52 }
  53
  54 static void ps_write (char *host, char *inst, char *val)
  55 {
  56         rrd_update_file (host, ps_file, val, ds_def, ds_num);
  57 }
  58
  59 #define BUFSIZE 256
  60 static void ps_submit (unsigned int running,
  61                 unsigned int sleeping,
  62                 unsigned int zombies,
  63                 unsigned int stopped,
  64                 unsigned int paging,
  65                 unsigned int blocked)
  66 {
  67         char buf[BUFSIZE];
  68
  69         if (snprintf (buf, BUFSIZE, "%u:%u:%u:%u:%u:%u:%u",
  70                                 (unsigned int) curtime,
  71                                 running, sleeping, zombies, stopped, paging,
  72                                 blocked) >= BUFSIZE)
  73                 return;
  74
  75         plugin_submit (MODULE_NAME, "-", buf);
  76 }
  77
  78 #if PROCESSES_HAVE_READ
  79 static void ps_read (void)
  80 {
  81 #ifdef KERNEL_LINUX
  82         unsigned int running, sleeping, zombies, stopped, paging, blocked;
  83
  84         char buf[BUFSIZE];
  85         char filename[20]; /* need 17 bytes */
  86         char *fields[256];
  87
  88         struct dirent *ent;
  89         DIR *proc;
  90         FILE *fh;
  91
  92         running = sleeping = zombies = stopped = paging = blocked = 0;
  93
  94         if ((proc = opendir ("/proc")) == NULL)
  95         {
  96                 syslog (LOG_ERR, "Cannot open `/proc': %s", strerror (errno));
  97                 return;
  98         }
  99
 100         while ((ent = readdir (proc)) != NULL)
 101         {
 102                 if (!isdigit (ent->d_name[0]))
 103                         continue;
 104
 105                 if (snprintf (filename, 20, "/proc/%s/stat", ent->d_name) >= 20)
 106                         continue;
 107
 108                 if ((fh = fopen (filename, "r")) == NULL)
 109                 {
 110                         syslog (LOG_ERR, "Cannot open `%s': %s", filename, strerror (errno));
 111                         continue;
 112                 }
 113
 114                 if (fgets (buf, BUFSIZE, fh) == NULL)
 115                 {
 116                         fclose (fh);
 117                         continue;
 118                 }
 119
 120                 fclose (fh);
 121
 122                 if (strsplit (buf, fields, 256) < 3)
 123                         continue;
 124
 125                 switch (fields[2][0])
 126                 {
 127                         case 'R': running++;  break;
 128                         case 'S': sleeping++; break;
 129                         case 'D': blocked++;  break;
 130                         case 'Z': zombies++;  break;
 131                         case 'T': stopped++;  break;
 132                         case 'W': paging++;   break;
 133                 }
 134         }
 135
 136         closedir(proc);
 137
 138         ps_submit (running, sleeping, zombies, stopped, paging, blocked);
 139 #endif /* defined(KERNEL_LINUX) */
 140 }
 141 #else
 142 # define ps_read NULL
 143 #endif /* PROCESSES_HAVE_READ */
 144 #undef BUFSIZE
 145
 146 void module_register (void)
 147 {
 148         plugin_register (MODULE_NAME, ps_init, ps_read, ps_write);
 149 }
 150
 151 #undef MODULE_NAME