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/* $Id: plugin_meminfo.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_meminfo.c $
*
* plugin for /proc/meminfo parsing
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.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.
*
*/
/*
* 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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