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/* $Id: plugin_meminfo.c,v 1.4 2004/01/25 05:30:09 reinelt Exp $
*
* plugin for /proc/meminfo 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_meminfo.c,v $
* 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 <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 = { 0, };
static int parse_meminfo (void)
{
int age;
FILE *stream;
// reread every 10 msec only
age=hash_age(&MemInfo, NULL, NULL);
if (age>0 && age<=10) return 0;
stream=fopen("/proc/meminfo", "r");
if (stream==NULL) {
error ("fopen(/proc/meminfo) failed: %s", strerror(errno));
return -1;
}
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_set (&MemInfo, key, val);
}
}
fclose (stream);
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);
if (val==NULL) val="";
SetResult(&result, R_STRING, val);
}
int plugin_init_meminfo (void)
{
AddFunction ("meminfo", 1, my_meminfo);
return 0;
}
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