gloadavg.c revision 31306
12490Sjkh/* 274528Sru * gloadavg.c - get load average for Linux 32490Sjkh * Copyright (C) 1993 Thomas Koenig 42490Sjkh * 52490Sjkh * Redistribution and use in source and binary forms, with or without 62490Sjkh * modification, are permitted provided that the following conditions 774814Sru * are met: 82490Sjkh * 1. Redistributions of source code must retain the above copyright 92490Sjkh * notice, this list of conditions and the following disclaimer. 1015929Sache * 2. The name of the author(s) may not be used to endorse or promote 1115929Sache * products derived from this software without specific prior written 122490Sjkh * permission. 139701Sbde * 1422449Swosch * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 152490Sjkh * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 162490Sjkh * 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 lint 27static const char rcsid[] = 28 "$Id$"; 29#endif /* not lint */ 30 31#ifndef __FreeBSD__ 32#define _POSIX_SOURCE 1 33 34/* System Headers */ 35 36#include <stdio.h> 37#else 38#include <stdlib.h> 39#endif 40 41/* Local headers */ 42 43#include "gloadavg.h" 44 45/* Global functions */ 46 47void perr(const char *a); 48 49double 50gloadavg(void) 51/* return the current load average as a floating point number, or <0 for 52 * error 53 */ 54{ 55 double result; 56#ifndef __FreeBSD__ 57 FILE *fp; 58 59 if((fp=fopen(PROC_DIR "loadavg","r")) == NULL) 60 result = -1.0; 61 else 62 { 63 if(fscanf(fp,"%lf",&result) != 1) 64 result = -1.0; 65 fclose(fp); 66 } 67#else 68 if (getloadavg(&result, 1) != 1) 69 perr("error in getloadavg"); 70#endif 71 return result; 72} 73