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plugin_uptime.c

/* $Id: plugin_uptime.c,v 1.6 2005/05/08 04:32:45 reinelt Exp $
 *
 * 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.
 *
 *
 * $Log: plugin_uptime.c,v $
 * Revision 1.6  2005/05/08 04:32:45  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.5  2005/01/18 06:30:23  reinelt
 * added (C) to all copyright statements
 *
 * Revision 1.4  2004/06/26 12:05:00  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.3  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 1.2  2004/06/20 10:09:56  reinelt
 *
 * 'const'ified the whole source
 *
 * Revision 1.1  2004/05/22 18:30:02  reinelt
 *
 * added plugin 'uptime'
 *
 */

/* 
 * 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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