/* $Id$
 * $URL$
 *
 * plugin for load average
 *
 * 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_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
}
f47b31e8cd56108f3f10711f8&amp;showmsg=1&amp;follow=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2021-04-30 10:31:15 +0200'>2021-04-30</span></td><td><a href='/dtv-scan-tables.git/commit/dvb-s/Intelsat-38-45.1E?id=137a4b9176f8fb074c955a49ae97865d2fb85095&amp;follow=1'>Rename a few satellites with two names and update frequencies</a></td><td>Mauro Carvalho Chehab</td><td>2</td><td><span class='deletions'>-283</span>/<span class='insertions'>+182</span></td></tr>
<tr><td><span title='2021-04-30 10:29:42 +0200'>2021-04-30</span></td><td><a href='/dtv-scan-tables.git/commit/dvb-s/Yamal-402-54.9E?id=cf6e4b502139112c82f092001eb6b9ac3912182a&amp;follow=1'>Update frequencies from Lyngsat</a></td><td>Mauro Carvalho Chehab</td><td>188</td><td><span class='deletions'>-12304</span>/<span class='insertions'>+12666</span></td></tr>
><td>Christoph Pfister</td><td>11</td><td><span class='deletions'>-8</span>/<span class='insertions'>+50</span></td></tr>
:19 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=246b8539fe86f8e6636e18b65b70da3169dfabd6&amp;follow=1'>[lcd4linux @ 2004-06-02 09:41:19 by reinelt]</a></td><td>reinelt</td><td>18</td><td><span class='deletions'>-114</span>/<span class='insertions'>+211</span></td></tr>
<tr><td><span title='2004-06-02 05:56:25 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/drv_Crystalfontz.c?id=b07a5205b19d8e46596d748af8e070bfd58949e5&amp;follow=1'>[lcd4linux @ 2004-06-02 05:56:25 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+6</span></td></tr>
<tr><td><span title='2004-06-02 05:35:55 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=a4cd5b8283d5ae7788091f9670e0a5165fcef136&amp;follow=1'>[lcd4linux @ 2004-06-02 05:35:55 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+20</span></td></tr>
<tr><td><span title='2004-06-02 05:28:06 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/documentation/xsl/xhtml.xsl?id=21d19e4dbe9a3a1f724a1963d13af21004a06e55&amp;follow=1'>[lcd4linux @ 2004-06-02 05:27:59 by reinelt]</a></td><td>reinelt</td><td>26</td><td><span class='deletions'>-0</span>/<span class='insertions'>+2405</span></td></tr>
<tr><td><span title='2004-06-02 05:14:16 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.c?id=491dc3d0e3ff77223118aac4712bf9ed2dac63a8&amp;follow=1'>[lcd4linux @ 2004-06-02 05:14:16 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-17</span>/<span class='insertions'>+31</span></td></tr>
<tr><td><span title='2004-06-01 06:45:30 +0000'>2004-06-01</span></td><td><a href='/lcd4linux.git/commit/timer.h?id=8dc94dba6511b8db40c0e209b0ea595052650a21&amp;follow=1'>[lcd4linux @ 2004-06-01 06:45:28 by reinelt]</a></td><td>reinelt</td><td>18</td><td><span class='deletions'>-71</span>/<span class='insertions'>+241</span></td></tr>
<tr><td><span title='2004-06-01 06:04:25 +0000'>2004-06-01</span></td><td><a href='/lcd4linux.git/commit/plugin_sample.c?id=a581675c3951031bdc1b71fa654d0dadcc191397&amp;follow=1'>[lcd4linux @ 2004-06-01 06:04:25 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-25</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2004-05-31 21:23:16 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/drv_MatrixOrbital.c?id=07afe02801bd274932a1dccdbe0ed27e782a5c80&amp;follow=1'>[lcd4linux @ 2004-05-31 21:23:16 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-37</span>/<span class='insertions'>+49</span></td></tr>
<tr><td><span title='2004-05-31 21:05:13 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/plugin_pop3.c?id=10ff23f9cdef25d4140e6c802c373aaf48270fee&amp;follow=1'>[lcd4linux @ 2004-05-31 21:05:13 by reinelt]</a></td><td>reinelt</td><td>5</td><td><span class='deletions'>-77</span>/<span class='insertions'>+111</span></td></tr>
<tr><td><span title='2004-05-31 16:39:06 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/hash.c?id=4e1eaa7205d8b7fbc64dc685d864b385a25602be&amp;follow=1'>[lcd4linux @ 2004-05-31 16:39:05 by reinelt]</a></td><td>reinelt</td><td>11</td><td><span class='deletions'>-180</span>/<span class='insertions'>+535</span></td></tr>
<tr><td><span title='2004-05-31 06:27:34 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/ChangeLog?id=61bd7f7bf2cef22b8d867ad7b168e4422ffd94f6&amp;follow=1'>[lcd4linux @ 2004-05-31 06:27:34 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+40</span></td></tr>
<tr><td><span title='2004-05-31 06:24:42 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=a53d8337c13f485875cad24edf74b0287b37600b&amp;follow=1'>[lcd4linux @ 2004-05-31 06:24:42 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-7</span>/<span class='insertions'>+29</span></td></tr>
<tr><td><span title='2004-05-31 05:38:02 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/drv_USBLCD.c?id=ea5453f570c5186379745a10054280f47a809299&amp;follow=1'>[lcd4linux @ 2004-05-31 05:38:02 by reinelt]</a></td><td>reinelt</td><td>8</td><td><span class='deletions'>-42</span>/<span class='insertions'>+94</span></td></tr>
<tr><td><span title='2004-05-31 01:31:01 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/drv_MilfordInstruments.c?id=0bda5dcd7faa2198fe972aa85b8c72cb0b666554&amp;follow=1'>[lcd4linux @ 2004-05-31 01:31:01 by andy-b]</a></td><td>andy-b</td><td>1</td><td><span class='deletions'>-10</span>/<span class='insertions'>+12</span></td></tr>
<tr><td><span title='2004-05-30 08:25:50 +0000'>2004-05-30</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=f40bd8007746a5a012f01cd58b4f0f94a36709b3&amp;follow=1'>[lcd4linux @ 2004-05-30 08:25:50 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-30</span>/<span class='insertions'>+92</span></td></tr>
<tr><td><span title='2004-05-29 23:30:20 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/drv_Image.c?id=f6aa208883850f97d72813b281b106ca184d94f7&amp;follow=1'>[lcd4linux @ 2004-05-29 23:30:20 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+9</span></td></tr>
<tr><td><span title='2004-05-29 15:53:28 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/plugin_ppp.c?id=c17304852de34a6be81d931923dd9e21c637ba95&amp;follow=1'>[lcd4linux @ 2004-05-29 15:53:28 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-9</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2004-05-29 01:07:56 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/plugin_diskstats.c?id=927530dfa14e1d35abd5a564a730f4fcf598a416&amp;follow=1'>[lcd4linux @ 2004-05-29 01:07:56 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-21</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2004-05-29 00:27:23 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/plugins.m4?id=4749def80d9a775c8d0791fe322322f5d1425c95&amp;follow=1'>[lcd4linux @ 2004-05-29 00:27:14 by reinelt]</a></td><td>reinelt</td><td>8</td><td><span class='deletions'>-11</span>/<span class='insertions'>+214</span></td></tr>
<tr><td><span title='2004-05-28 14:38:10 +0000'>2004-05-28</span></td><td><a href='/lcd4linux.git/commit/Status?id=ba5326cf8e6dd8051efadde4528e3aeb6e654fb2&amp;follow=1'>[lcd4linux @ 2004-05-28 14:38:10 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-1</span>/<span class='insertions'>+41</span></td></tr>