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75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/*
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* have_gettime - Determine if we clock_gettime()
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*
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* usage:
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* have_gettime
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*
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* Not all systems have the clock_gettime() function, so this may not
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* compile on your system.
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*
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* This prog outputs several defines:
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*
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* HAVE_GETTIME
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* defined ==> use clock_gettime() for either CLOCK_SGI_CYCLE
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* and/or CLOCK_REALTIME
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* undefined ==> clock_gettime() is not available for both
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* CLOCK_SGI_CYCLE and CLOCK_REALTIME
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*/
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/*
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* Copyright (c) 1999 by Landon Curt Noll. All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright, this permission notice and text
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* this comment, and the disclaimer below appear in all of the following:
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*
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* supporting documentation
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* source copies
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* source works derived from this source
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* binaries derived from this source or from derived source
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* chongo was here /\../\
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*/
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#include <time.h>
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int
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main(void)
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{
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#if defined(HAVE_NO_GETTIME)
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printf("#undef HAVE_GETTIME /* no */\n");
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#else /* HAVE_NO_GETTIME */
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# if defined(CLOCK_SGI_CYCLE)
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struct timespec sgi_cycle; /* SGI hardware clock */
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(void) clock_gettime(CLOCK_SGI_CYCLE, &sgi_cycle);
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printf("#define HAVE_GETTIME /* yes - w/CLOCK_SGI_CYCLE */\n");
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# elif defined(CLOCK_REALTIME)
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struct timespec realtime; /* POSIX realtime clock */
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(void) clock_gettime(CLOCK_REALTIME, &realtime);
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printf("#define HAVE_GETTIME /* yes - CLOCK_REALTIME only */\n");
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# else
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printf("#undef HAVE_GETTIME /* no - no SGI_CYCLE and no REALTIME */\n");
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# endif /* CLOCK_REALTIME */
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#endif /* HAVE_NO_GETTIME */
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/* exit(0); */
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return 0;
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}
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