aboutsummaryrefslogtreecommitdiffstats
path: root/config.sub
diff options
context:
space:
mode:
Diffstat (limited to 'config.sub')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-07 08:59:55 +0000
' href='#n54'>54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 
/* $Id: plugin_loadavg.c,v 1.10 2005/05/08 04:32:44 reinelt Exp $
 *
 * plugin for load average
 *
 * 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_loadavg.c,v $
 * Revision 1.10  2005/05/08 04:32:44  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.9  2005/01/18 06:30:23  reinelt
 * added (C) to all copyright statements
 *
 * Revision 1.8  2004/06/26 12:05:00  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.7  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 1.6  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
}