glibc/sysdeps/posix/clock_getres.c
Ulrich Drepper 8be918b7bb Update.
* conform/data/sys/time.h-data: Allow sys/select.h.
	* conform/data/sys/un.h-data: Fix typo.
	* time/sys/time.h: Don't include all of <time.h>, just struct timeval.
	* sysdeps/posix/clock_getres.c: Include <time.h> instead of
	<sys/time.h>.
	* sysdeps/unix/clock_nanosleep.c: Likewise.
	* sysdeps/unix/i386/clock_getcpuclockid.c: Likewise.
	* sysdeps/unix/i386/i586/clock_getres.c: Likewise.
	* sysdeps/unix/clock_gettime.c: Also include <time.h>.
	* sysdeps/unix/clock_settime.c: Likewise.

	* sysdeps/generic/pselect.c: Include <stddef.h> for NULL.
	* login/getutent.c: Likewise.
	* login/getutid.c: Likewise.
	* login/getutline.c: Likewise.

	* socket/sys/un.h: Define SUN_LEN only if __USE_MISC.
2001-01-28 00:00:08 +00:00

62 lines
1.6 KiB
C

/* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <time.h>
#include <unistd.h>
#ifndef EXTRA_CLOCK_CASES
# define EXTRA_CLOCK_CASES
#endif
/* Get resolution of clock. */
int
clock_getres (clockid_t clock_id, struct timespec *res)
{
int retval = -1;
switch (clock_id)
{
case CLOCK_REALTIME:
{
long int clk_tck = sysconf (_SC_CLK_TCK);
if (__builtin_expect (clk_tck != -1, 1))
{
/* This implementation assumes that the realtime clock has a
resolution higher than 1 second. This is the case for any
reasonable implementation. */
res->tv_sec = 0;
res->tv_nsec = 1000000000 / clk_tck;
retval = 0;
}
}
break;
EXTRA_CLOCK_CASES
default:
__set_errno (EINVAL);
break;
}
return retval;
}