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AIX gettimeofday implementation.

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This commit is contained in:
Ulrich Drepper 2001-04-04 01:32:14 +00:00
parent 42f86baa0d
commit 7fac016cfa
1 changed files with 94 additions and 0 deletions
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sysdeps/unix/sysv/aix/gettimeofday.c Normal file
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/* Copyright (C) 1991, 92, 94, 95, 96, 97 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 <sys/time.h>
#ifndef HAVE_GNU_LD
#define __daylight daylight
#define __timezone timezone
#define __tzname tzname
#endif
/* Assembler Routines to access the timer registers */
asm("
.rtc_upper: mfspr 3,4 # copy RTCU to return register
blr
.rtc_lower: mfspr 3,5 # copy RTCL to return register
blr
");
/* Get the current time of day and timezone information,
putting it into *TV and *TZ. If TZ is NULL, *TZ is not filled.
Returns 0 on success, -1 on errors. */
int
__gettimeofday (tv, tz)
struct timeval *tv;
struct timezone *tz;
{
int ts, tl, tu;
if (tv == NULL)
{
__set_errno (EINVAL);
return -1;
}
ts = rtc_upper(); /* seconds */
tl = rtc_lower(); /* nanoseconds */
tu = rtc_upper(); /* Check for a carry from */
if (ts != tu) /* the lower reg to the upper */
tl = rtc_lower(); /* Recover from the race condition */
tv->tv_sec = (long int) (tu + (double)tl/1000000000);
tv->tv_usec = (long int) ((double)tl/1000);
#if 0
if (tz != NULL)
{
const time_t timer = tv->tv_sec;
struct tm tm;
const struct tm *tmp;
const long int save_timezone = __timezone;
const long int save_daylight = __daylight;
char *save_tzname[2];
save_tzname[0] = __tzname[0];
save_tzname[1] = __tzname[1];
tmp = localtime_r (&timer, &tm);
tz->tz_minuteswest = __timezone / 60;
tz->tz_dsttime = __daylight;
__timezone = save_timezone;
__daylight = save_daylight;
__tzname[0] = save_tzname[0];
__tzname[1] = save_tzname[1];
if (tmp == NULL)
return -1;
}
#endif
return 0;
}
weak_alias (__gettimeofday, gettimeofday)