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 * $FreeBSD: src/libexec/atrun/gloadavg.c,v 1.5 1999/08/28 00:09:12 peter Exp $ 26 * $DragonFly: src/libexec/atrun/gloadavg.c,v 1.3 2004/02/03 23:24:50 rob Exp $ 27 */ 28 29 #ifndef __DragonFly__ 30 #define _POSIX_SOURCE 1 31 32 /* System Headers */ 33 34 #include <stdio.h> 35 #else 36 #include <stdlib.h> 37 #endif 38 39 /* Local headers */ 40 41 #include "gloadavg.h" 42 43 /* Global functions */ 44 45 void perr(const char *a); 46 47 double 48 gloadavg(void) 49 /* return the current load average as a floating point number, or <0 for 50 * error 51 */ 52 { 53 double result; 54 #ifndef __DragonFly__ 55 FILE *fp; 56 57 if((fp=fopen(PROC_DIR "loadavg","r")) == NULL) 58 result = -1.0; 59 else 60 { 61 if(fscanf(fp,"%lf",&result) != 1) 62 result = -1.0; 63 fclose(fp); 64 } 65 #else 66 if (getloadavg(&result, 1) != 1) 67 perr("error in getloadavg"); 68 #endif 69 return result; 70 } 71