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73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* gloadavg.c - get load average for Linux
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* Copyright (C) 1993 Thomas Koenig
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the author(s) may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#ifndef __FreeBSD__
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#define _POSIX_SOURCE 1
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/* System Headers */
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#include <stdio.h>
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#else
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#include <stdlib.h>
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#endif
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/* Local headers */
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#include "gloadavg.h"
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/* Global functions */
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void perr(const char *a);
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double
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gloadavg(void)
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/* return the current load average as a floating point number, or <0 for
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* error
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*/
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{
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double result;
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#ifndef __FreeBSD__
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FILE *fp;
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if((fp=fopen(PROC_DIR "loadavg","r")) == NULL)
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result = -1.0;
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else
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{
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if(fscanf(fp,"%lf",&result) != 1)
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result = -1.0;
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fclose(fp);
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}
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#else
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if (getloadavg(&result, 1) != 1)
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perr("error in getloadavg");
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#endif
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return result;
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}
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