archived-lcd4linux/plugin_cpuinfo.c

/* $Id: plugin_cpuinfo.c,v 1.11 2004/06/26 09:27:21 reinelt Exp $
 *
 * plugin for /proc/cpuinfo 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_cpuinfo.c,v $
 * Revision 1.11  2004/06/26 09:27:21  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones ('//' => '/* */')
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.10  2004/06/17 06:23:43  reinelt
 *
 * hash handling rewritten to solve performance issues
 *
 * Revision 1.9  2004/03/11 06:39:59  reinelt
 * big patch from Martin:
 * - reuse filehandles
 * - memory leaks fixed
 * - earlier busy-flag checking with HD44780
 * - reuse memory for strings in RESULT and hash
 * - netdev_fast to wavid time-consuming regex
 *
 * Revision 1.8  2004/03/03 03:47:04  reinelt
 * big patch from Martin Hejl:
 * - use qprintf() where appropriate
 * - save CPU cycles on gettimeofday()
 * - add quit() functions to free allocated memory
 * - fixed lots of memory leaks
 *
 * Revision 1.7  2004/01/29 04:40:02  reinelt
 * every .c file includes "config.h" now
 *
 * Revision 1.6  2004/01/21 10:48:17  reinelt
 * hash_age function added
 *
 * Revision 1.5  2004/01/16 11:12:26  reinelt
 * some bugs in plugin_xmms fixed, parsing moved to own function
 * plugin_proc_stat nearly finished
 *
 * Revision 1.4  2004/01/16 07:26:25  reinelt
 * moved various /proc parsing to own functions
 * made some progress with /proc/stat parsing
 *
 * Revision 1.3  2004/01/15 04:29:45  reinelt
 * moved lcd4linux.conf.sample to *.old
 * lcd4linux.conf.sample with new layout
 * new plugins 'loadavg' and 'meminfo'
 * text widget have pre- and postfix
 *
 * Revision 1.2  2004/01/14 11:33:00  reinelt
 * new plugin 'uname' which does what it's called
 * text widget nearly finished
 * first results displayed on MatrixOrbital
 *
 * Revision 1.1  2004/01/13 10:03:01  reinelt
 * new util 'hash' for associative arrays
 * new plugin 'cpuinfo'
 *
 */

/* 
 * exported functions:
 *
 * int plugin_init_cpuinfo (void)
 *  adds functions to access /proc/cpuinfo
 *
 */


#include "config.h"

#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 CPUinfo;
static FILE *stream = NULL;

static int parse_cpuinfo (void)
{
  int age;
  
  /* reread every second only */
  age = hash_age(&CPUinfo, NULL);
  if (age > 0 && age <= 1000) return 0;
  
  if (stream == NULL) stream = fopen("/proc/cpuinfo", "r");
  if (stream == NULL) {
    error ("fopen(/proc/cpuinfo) failed: %s", strerror(errno));
    return -1;
  }
  rewind(stream);
  while (!feof(stream)) {
    char buffer[256];
    char *c, *key, *val;
    fgets (buffer, sizeof(buffer), stream);
    c = strchr(buffer, ':');
    if (c == NULL) continue;
    key = buffer; val = c+1;
    /* strip leading blanks from key */
    while (isspace(*key)) *key++ = '\0';
    /* strip trailing blanks from key */
    do *c = '\0'; while (isspace(*--c));
    /* strip leading blanks from value */
    while (isspace(*val)) *val++ = '\0';
    /* strip trailing blanks from value */
    for (c = val; *c != '\0'; c++);
    while (isspace(*--c)) *c = '\0';
    
    /* add entry to hash table */
    hash_put (&CPUinfo, key, val);
      
  }
  return 0;
}
  

static void my_cpuinfo (RESULT *result, RESULT *arg1)
{
  char *key, *val;
  
  if (parse_cpuinfo() < 0) {
    SetResult(&result, R_STRING, ""); 
    return;
  }
  
  key = R2S(arg1);
  val = hash_get(&CPUinfo, key, NULL);
  if (val == NULL) val = "";
  
  SetResult(&result, R_STRING, val); 
}


int plugin_init_cpuinfo (void)
{
  hash_create (&CPUinfo);
  AddFunction ("cpuinfo", 1, my_cpuinfo);
  return 0;
}

void plugin_exit_cpuinfo(void) 
{
  if (stream != NULL) {
    fclose (stream);
    stream = NULL;
  }
  hash_destroy(&CPUinfo);
}