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plugin_meminfo.c

/* $Id: plugin_meminfo.c,v 1.12 2005/05/08 04:32:44 reinelt Exp $
 *
 * plugin for /proc/meminfo parsing
 *
 * Copyright (C) 2003 Michael Reinelt <reinelt@eunet.at>
 * Copyright (C) 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_meminfo.c,v $
 * Revision 1.12  2005/05/08 04:32:44  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.11  2005/01/18 06:30:23  reinelt
 * added (C) to all copyright statements
 *
 * Revision 1.10  2004/06/26 12:05:00  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.9  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 1.8  2004/06/17 06:23:43  reinelt
 *
 * hash handling rewritten to solve performance issues
 *
 * Revision 1.7  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 1.6  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 1.5  2004/01/29 04:40:02  reinelt
 * every .c file includes "config.h" now
 *
 * Revision 1.4  2004/01/25 05:30:09  reinelt
 * plugin_netdev for parsing /proc/net/dev added
 *
 * Revision 1.3  2004/01/21 10:48:17  reinelt
 * hash_age function added
 *
 * 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  2004/01/15 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
 *
 */

/* 
 * exported functions:
 *
 * int plugin_init_meminfo (void)
 *  adds functions to access /proc/meminfo
 *
 */


#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 MemInfo;
static FILE *stream = NULL;

static int parse_meminfo(void)
{
    int age;

    /* reread every 10 msec only */
    age = hash_age(&MemInfo, NULL);
    if (age > 0 && age <= 10)
      return 0;

    if (stream == NULL)
      stream = fopen("/proc/meminfo", "r");
    if (stream == NULL) {
      error("fopen(/proc/meminfo) 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';
      /* skip lines that do not end with " kB" */
      if (*c == 'B' && *(c - 1) == 'k' && *(c - 2) == ' ') {
          /* strip trailing " kB" from value */
          *(c - 2) = '\0';
          /* add entry to hash table */
          hash_put(&MemInfo, key, val);
      }
    }
    return 0;
}

static void my_meminfo(RESULT * result, RESULT * arg1)
{
    char *key, *val;

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

    key = R2S(arg1);
    val = hash_get(&MemInfo, key, NULL);
    if (val == NULL)
      val = "";

    SetResult(&result, R_STRING, val);
}


int plugin_init_meminfo(void)
{
    hash_create(&MemInfo);
    AddFunction("meminfo", 1, my_meminfo);
    return 0;
}


void plugin_exit_meminfo(void)
{
    if (stream != NULL) {
      fclose(stream);
      stream = NULL;
    }
    hash_destroy(&MemInfo);
}

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