gloadavg.c revision 10154
1/* 2 * gloadavg.c - get load average for Linux 3 * Copyright (C) 1993 Thomas Koenig 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. The name of the author(s) may not be used to endorse or promote 11 * products derived from this software without specific prior written 12 * permission. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef __FreeBSD__ 27#define _POSIX_SOURCE 1 28 29/* System Headers */ 30 31#include <stdio.h> 32#else 33#include <stdlib.h> 34#endif 35 36/* Local headers */ 37 38#include "gloadavg.h" 39 40/* File scope variables */ 41 42static char rcsid[] = "$Id: gloadavg.c,v 1.2 1995/08/10 04:06:54 ache Exp $"; 43 44/* Global functions */ 45 46double 47gloadavg(void) 48/* return the current load average as a floating point number, or <0 for 49 * error 50 */ 51{ 52 double result; 53#ifndef __FreeBSD__ 54 FILE *fp; 55 56 if((fp=fopen(PROC_DIR "loadavg","r")) == NULL) 57 result = -1.0; 58 else 59 { 60 if(fscanf(fp,"%lf",&result) != 1) 61 result = -1.0; 62 fclose(fp); 63 } 64#else 65 if (getloadavg(&result, 1) != 1) 66 perr("Error in getloadavg"); 67#endif 68 return result; 69} 70