1 /*- 2 * gloadavg.c - get load average for Linux 3 * Copyright (C) 1993 Thomas Koenig 4 * 5 * SPDX-License-Identifier: BSD-2-Clause 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. The name of the author(s) may not be used to endorse or promote 13 * products derived from this software without specific prior written 14 * permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef __FreeBSD__ 29 #define _POSIX_SOURCE 1 30 31 /* System Headers */ 32 33 #include <stdio.h> 34 #else 35 #include <stdlib.h> 36 #endif 37 38 /* Local headers */ 39 40 #include "gloadavg.h" 41 42 /* Global functions */ 43 44 void perr(const char *fmt, ...); 45 46 double 47 gloadavg(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