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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/posix/gettimeofday.c
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initial import
Diffstat (limited to 'sysdeps/posix/gettimeofday.c')
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diff --git a/sysdeps/posix/gettimeofday.c b/sysdeps/posix/gettimeofday.c
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+/* Copyright (C) 1991, 1992, 1994, 1995 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+
+#ifndef HAVE_GNU_LD
+#define __daylight	daylight
+#define __timezone	timezone
+#define __tzname	tzname
+#endif
+
+
+/* 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
+DEFUN(__gettimeofday, (tv, tz),
+      struct timeval *tv AND struct timezone *tz)
+{
+  if (tv == NULL)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  tv->tv_sec = (long int) time ((time_t *) NULL);
+  tv->tv_usec = 0L;
+
+  if (tz != NULL)
+    {
+      CONST time_t timer = tv->tv_sec;
+      CONST struct tm *tm;
+
+      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];
+
+      tm = localtime (&timer);
+
+      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 (tm == NULL)
+	return -1;
+    }
+
+  return 0;
+}
+
+weak_alias (__gettimeofday, gettimeofday)