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/*
* have_gettime - determine if we have clock_gettime()
*
* Copyright (C) 1999 Landon Curt Noll
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Under source code control: 1999/10/20 23:43:42
* File existed as early as: 1999
*
* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
/*
* usage:
* have_gettime
*
* Not all systems have the clock_gettime() function, so this may not
* compile on your system.
*
* This prog outputs several defines:
*
* HAVE_GETTIME
* defined ==> use clock_gettime() for either CLOCK_SGI_CYCLE
* and/or CLOCK_REALTIME
* undefined ==> clock_gettime() is not available for both
* CLOCK_SGI_CYCLE and CLOCK_REALTIME
*/
#include <time.h>
int
main(void)
{
#if defined(HAVE_NO_GETTIME)
printf("#undef HAVE_GETTIME /* no */\n");
#else /* HAVE_NO_GETTIME */
# if defined(CLOCK_SGI_CYCLE)
struct timespec sgi_cycle; /* SGI hardware clock */
(void) clock_gettime(CLOCK_SGI_CYCLE, &sgi_cycle);
printf("#define HAVE_GETTIME /* yes - w/CLOCK_SGI_CYCLE */\n");
# elif defined(CLOCK_REALTIME)
struct timespec realtime; /* POSIX realtime clock */
(void) clock_gettime(CLOCK_REALTIME, &realtime);
printf("#define HAVE_GETTIME /* yes - CLOCK_REALTIME only */\n");
# else
printf("#undef HAVE_GETTIME /* no - no SGI_CYCLE and no REALTIME */\n");
# endif /* CLOCK_REALTIME */
#endif /* HAVE_NO_GETTIME */
/* exit(0); */
return 0;
}
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