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/* $Id: plugin_loadavg.c,v 1.6 2004/03/11 06:39:59 reinelt Exp $
*
* plugin for load average
*
* 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_loadavg.c,v $
* Revision 1.6 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 1.5 2004/03/08 18:46:21 hejl
* Fixed bug introduced with "caching" the loadavg values
*
* Revision 1.4 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 1.3 2004/01/30 07:12:35 reinelt
* HD44780 busy-flag support from Martin Hejl
* loadavg() uClibc replacement from Martin Heyl
* round() uClibc replacement from Martin Hejl
* warning in i2c_sensors fixed
* [
*
* Revision 1.2 2004/01/29 04:40:02 reinelt
* every .c file includes "config.h" now
*
* 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_loadavg (void)
* adds functions for load average
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include "debug.h"
#include "plugin.h"
#ifndef HAVE_GETLOADAVG
static int fd = -2;
int getloadavg (double loadavg[], int nelem)
{
char buf[65], *p;
ssize_t nread;
int i;
if (fd == -2) fd = open ("/proc/loadavg", O_RDONLY);
if (fd < 0) return -1;
lseek(fd,0,SEEK_SET);
nread = read (fd, buf, sizeof buf - 1);
if (nread < 0) return -1;
buf[nread - 1] = '\0';
if (nelem > 3) nelem = 3;
p = buf;
for (i = 0; i < nelem; ++i) {
char *endp;
loadavg[i] = strtod (p, &endp);
if (endp == NULL || endp == p)
/* This should not happen. The format of /proc/loadavg
must have changed. Don't return with what we have,
signal an error. */
return -1;
p = endp;
}
return i;
}
#endif
static void my_loadavg (RESULT *result, RESULT *arg1)
{
static int nelem=-1;
int index,age;
static double loadavg[3];
static struct timeval last_value;
struct timeval now;
gettimeofday(&now,NULL);
age = (now.tv_sec - last_value.tv_sec)*1000 + (now.tv_usec - last_value.tv_usec)/1000;
// reread every 10 msec only
if (nelem==-1 || age==0 || age>10) {
nelem=getloadavg(loadavg, 3);
if (nelem<0) {
error ("getloadavg() failed!");
SetResult(&result, R_STRING, "");
return;
}
last_value=now;
}
index=R2N(arg1);
if (index<1 || index>nelem) {
error ("loadavg(%d): index out of range!", index);
SetResult(&result, R_STRING, "");
return;
}
SetResult(&result, R_NUMBER, &(loadavg[index-1]));
return;
}
int plugin_init_loadavg (void)
{
AddFunction ("loadavg", 1, my_loadavg);
return 0;
}
void plugin_exit_loadavg(void)
{
#ifndef HAVE_GETLOADAVG
if (fd>0) close(fd);
fd=-2;
#endif
}
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