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Improved seed() generation

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Drop support for CLOCK_SGI_CYCLE.

Improved seed() generation.  Improved some comments in seed.c.
Added have_environ.c to build have_environ.h in order to
determine if:

    extern char **environ;	/* user environment */

is an valid external symbol.
This commit is contained in:
Landon Curt Noll
2021-12-06 21:16:08 -08:00
parent 7417f2e776
commit b30c5c1855
7 changed files with 213 additions and 74 deletions
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17
have_gettime.c
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@@ -34,10 +34,9 @@
* 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
* defined ==> use clock_gettime() from CLOCK_REALTIME
* undefined ==> clock_gettime() is not available from
* CLOCK_REALTIME
*/
#include <stdio.h>
@@ -56,13 +55,7 @@ main(void)
#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)
# if defined(CLOCK_REALTIME)
struct timespec realtime; /* POSIX realtime clock */
(void) clock_gettime(CLOCK_REALTIME, &realtime);
@@ -70,7 +63,7 @@ main(void)
# else
printf("#undef HAVE_GETTIME /* no - no SGI_CYCLE and no REALTIME */\n");
printf("#undef HAVE_GETTIME /* no - no CLOCK_REALTIME */\n");
# endif /* CLOCK_REALTIME */