archived-lcd4linux/plugin_proc_stat.c

/* $Id: plugin_proc_stat.c,v 1.7 2004/01/21 10:48:17 reinelt Exp $
 *
 * plugin for /proc/stat parsing
 *
 * Copyright 2003 Michael Reinelt <reinelt@eunet.at>
 * Copyright 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: plugin_proc_stat.c,v $
 * Revision 1.7  2004/01/21 10:48:17  reinelt
 * hash_age function added
 *
 * Revision 1.6  2004/01/20 12:45:47  reinelt
 * "Default screen" working with MatrixOrbital
 *
 * Revision 1.5  2004/01/18 09:01:45  reinelt
 * /proc/stat parsing finished
 *
 * Revision 1.4  2004/01/18 06:54:08  reinelt
 * bug in expr.c fixed (thanks to Xavier)
 * some progress with /proc/stat parsing
 *
 * Revision 1.3  2004/01/16 11:12:26  reinelt
 * some bugs in plugin_xmms fixed, parsing moved to own function
 * plugin_proc_stat nearly finished
 *
 * Revision 1.2  2004/01/16 07:26:25  reinelt
 * moved various /proc parsing to own functions
 * made some progress with /proc/stat parsing
 *
 * Revision 1.1  2004/01/16 05:04:53  reinelt
 * started plugin proc_stat which should parse /proc/stat
 * which again is a paint in the a**
 * thinking over implementation methods of delta functions
 * (CPU load, ...)
 *
 */

/* 
 * exported functions:
 *
 * int plugin_init_proc_stat (void)
 *  adds functions to access /proc/stat
 *
 */


#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "debug.h"
#include "plugin.h"
#include "hash.h"


static HASH Stat = { 0, };

static void hash_set1 (char *key1, char *val) 
{
  hash_set_filter (&Stat, key1, val);
}


static void hash_set2 (char *key1, char *key2, char *val) 
{
  char key[32];
  
  snprintf (key, sizeof(key), "%s.%s", key1, key2);
  hash_set1 (key, val);
}


static void hash_set3 (char *key1, char *key2, char *key3, char *val) 
{
  char key[32];
  
  snprintf (key, sizeof(key), "%s.%s.%s", key1, key2, key3);
  hash_set1 (key, val);
}


static int parse_proc_stat (void)
{
  FILE *stream;
  
  // reread every 10 msec only
  age=hash_age(&Stat, NULL, NULL);
  if (age>0 && age<=10) return 0;
  
  stream=fopen("/proc/stat", "r");
  if (stream==NULL) {
    error ("fopen(/proc/stat) failed: %s", strerror(errno));
    return -1;
  }
  
  while (!feof(stream)) {
    char buffer[1024];
    if (fgets (buffer, sizeof(buffer), stream) ==NULL) break;
    if (strncmp(buffer, "cpu", 3)==0) {
      char *cpu;
      cpu=strtok(buffer, " \t\n");
      hash_set2 (cpu, "user",   strtok(NULL, " \t\n"));
      hash_set2 (cpu, "nice",   strtok(NULL, " \t\n"));
      hash_set2 (cpu, "system", strtok(NULL, " \t\n"));
      hash_set2 (cpu, "idle",   strtok(NULL, " \t\n"));
    } 
    else if (strncmp(buffer, "page ", 5)==0) {
      strtok(buffer, " \t\n");
      hash_set2 ("page", "in",  strtok(NULL, " \t\n"));
      hash_set2 ("page", "out", strtok(NULL, " \t\n"));
    } 
    else if (strncmp(buffer, "swap ", 5)==0) {
      strtok(buffer, " \t\n");
      hash_set2 ("swap", "in",  strtok(NULL, " \t\n"));
      hash_set2 ("swap", "out", strtok(NULL, " \t\n"));
    } 
    else if (strncmp(buffer, "intr ", 5)==0) {
      int i;
      strtok(buffer, " \t\n");
      hash_set2 ("intr", "sum", strtok(NULL, " \t\n"));
      for (i=0; i<16; i++) {
	char buffer[3];
	snprintf(buffer, sizeof(buffer), "%d", i);
	hash_set2 ("intr", buffer, strtok(NULL, " \t\n"));
      }
    } 
    else if (strncmp(buffer, "disk_io:", 8)==0) {
      char *dev=strtok(buffer+8, " \t\n:()");
      while (dev!=NULL) {
	char *p;
	while ((p=strchr(dev, ','))!=NULL) *p=':';
	hash_set3 ("disk_io", dev, "io",   strtok(NULL, " :(,"));
	hash_set3 ("disk_io", dev, "rio",  strtok(NULL, " ,"));
	hash_set3 ("disk_io", dev, "rblk", strtok(NULL, " ,"));
	hash_set3 ("disk_io", dev, "wio",  strtok(NULL, " ,"));
	hash_set3 ("disk_io", dev, "wblk", strtok(NULL, " ,)"));
	dev=strtok(NULL, " \t\n:()");
      }
    } 
    else if (strncmp(buffer, "ctxt ", 5)==0) {
      strtok(buffer, " \t\n");
      hash_set2 ("ctxt", NULL, strtok(NULL, " \t\n"));
    } 
    else if (strncmp(buffer, "btime ", 6)==0) {
      strtok(buffer, " \t\n");
      hash_set2 ("btime", NULL, strtok(NULL, " \t\n"));
    } 
    else if (strncmp(buffer, "processes ", 10)==0) {
      strtok(buffer, " \t\n");
      hash_set1 ("processes", strtok(NULL, " \t\n"));
    } 
    else {
      error ("internal error: unhandled entry '%s' from /proc/stat", strtok(buffer, " \t\n"));
    }
  }
  fclose (stream);
  return 0;
}


static void my_proc_stat (RESULT *result, int argc, RESULT *argv[])
{
  char  *string;
  double number;

  if (parse_proc_stat()<0) {
    SetResult(&result, R_STRING, ""); 
    return;
  }

  switch (argc) {
  case 1:
    string=hash_get(&Stat, R2S(argv[0]));
    if (string==NULL) string="";
    SetResult(&result, R_STRING, string); 
    break;
  case 2:
    number=hash_get_filter(&Stat, R2S(argv[0]), R2N(argv[1]));
    SetResult(&result, R_NUMBER, &number); 
    break;
  default:
    error ("proc_stat(): wrong number of parameters");
    SetResult(&result, R_STRING, ""); 
  }
}


static void my_cpu (RESULT *result, RESULT *arg1, RESULT *arg2)
{
  char *key;
  int delay;
  double value;
  double cpu_user, cpu_nice, cpu_system, cpu_idle, cpu_total;
  
  if (parse_proc_stat()<0) {
    SetResult(&result, R_STRING, ""); 
    return;
  }
  
  key   = R2S(arg1);
  delay = R2N(arg2);
  
  cpu_user   = hash_get_filter(&Stat, "cpu.user",   delay);
  cpu_nice   = hash_get_filter(&Stat, "cpu.nice",   delay);
  cpu_system = hash_get_filter(&Stat, "cpu.system", delay);
  cpu_idle   = hash_get_filter(&Stat, "cpu.idle",   delay);

  cpu_total  = cpu_user+cpu_nice+cpu_system+cpu_idle;
  
  if      (strcasecmp(key, "user"  )==0) value=cpu_user;
  else if (strcasecmp(key, "nice"  )==0) value=cpu_nice;
  else if (strcasecmp(key, "system")==0) value=cpu_system;
  else if (strcasecmp(key, "idle"  )==0) value=cpu_idle;
  else if (strcasecmp(key, "busy"  )==0) value=cpu_total-cpu_idle;
  
  if (cpu_total>0.0)
    value = 100*value/cpu_total;
  else
    value=0.0;

  SetResult(&result, R_NUMBER, &value); 
}


int plugin_init_proc_stat (void)
{
  AddFunction ("proc_stat", -1, my_proc_stat);
  AddFunction ("cpu", 2, my_cpu);
  return 0;
}