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 lint 27 static const char rcsid[] = 28 "$FreeBSD$"; 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 47 void perr(const char *a); 48 49 double 50 gloadavg(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