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/* $Id: plugin_uptime.c 728 2007-01-14 11:14:38Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/branches/0.10.1/plugin_uptime.c $
*
* plugin for uptime
*
* 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.
*
*/
/*
* exported functions:
*
* int plugin_init_uptime (void)
* adds functions for uptime
*
*/
#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"
static int fd = -2;
static char *itoa(char *buffer, const size_t size, unsigned int value)
{
char *p;
/* sanity checks */
if (buffer == NULL || size < 2)
return (NULL);
/* p points to last char */
p = buffer + size - 1;
/* set terminating zero */
*p = '\0';
do {
*--p = value % 10 + '0';
value = value / 10;
} while (value != 0 && p > buffer);
return p;
}
char *struptime(const unsigned int uptime, const char *format)
{
static char string[256];
const char *src;
char *dst;
int len, size;
src = format;
dst = string;
len = 0;
/* leave room for terminating zero */
size = sizeof(string) - 1;
while (len < size) {
if (*src == '%') {
src++;
if (strchr("sSmMhHd", *src) != NULL) {
char buffer[12], *s;
unsigned int value = 0;
int leading_zero = 0;
switch (*src++) {
case 's':
value = uptime;
break;
case 'S':
value = uptime % 60;
leading_zero = 1;
break;
case 'm':
value = uptime / 60;
break;
case 'M':
value = (uptime / 60) % 60;
leading_zero = 1;
break;
case 'h':
value = uptime / 60 / 60;
break;
case 'H':
value = (uptime / 60 / 60) % 24;
leading_zero = 1;
break;
case 'd':
value = uptime / 60 / 60 / 24;
break;
}
if (leading_zero && value < 10) {
len++;
*dst++ = '0';
}
s = itoa(buffer, sizeof(buffer), value);
while (len < size && *s != '\0') {
len++;
*dst++ = *s++;
}
} else if (*src == '%') {
len++;
*dst++ = '%';
} else {
len += 2;
*dst++ = '%';
*dst++ = *src++;
}
} else {
len++;
*dst++ = *src;
if (*src++ == '\0')
break;
}
}
/* enforce terminating zero */
if (len >= size && *(dst - 1) != '\0') {
len++;
*dst = '\0';
}
return string;
}
double getuptime(void)
{
char buffer[36];
int i;
if (fd == -2)
fd = open("/proc/uptime", O_RDONLY);
if (fd < 0)
return -1;
lseek(fd, 0, SEEK_SET);
i = read(fd, buffer, sizeof(buffer) - 1);
if (i < 0)
return -1;
buffer[i - 1] = '\0';
/* ignore the 2nd value from /proc/uptime */
return strtod(buffer, NULL);
}
static void my_uptime(RESULT * result, const int argc, RESULT * argv[])
{
int age;
static double uptime = 0.0;
static struct timeval last_value;
struct timeval now;
if (argc > 1) {
error("uptime(): wrong number of parameters");
SetResult(&result, R_STRING, "");
return;
}
gettimeofday(&now, NULL);
age = (now.tv_sec - last_value.tv_sec) * 1000 + (now.tv_usec - last_value.tv_usec) / 1000;
/* reread every 100 msec only */
if (fd == -2 || age == 0 || age > 100) {
uptime = getuptime();
if (uptime < 0.0) {
error("parse(/proc/uptime) failed!");
SetResult(&result, R_STRING, "");
return;
}
last_value = now;
}
if (argc == 0) {
SetResult(&result, R_NUMBER, &uptime);
} else {
SetResult(&result, R_STRING, struptime(uptime, R2S(argv[0])));
}
return;
}
int plugin_init_uptime(void)
{
AddFunction("uptime", -1, my_uptime);
return 0;
}
void plugin_exit_uptime(void)
{
if (fd > 0)
close(fd);
fd = -2;
}
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