glibc/time/ftime.c

/* Copyright (C) 1994-2018 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <time.h>
#include <sys/timeb.h>

int
ftime (struct timeb *timebuf)
{
  int save = errno;
  struct tm tp;

  __set_errno (0);
  if (time (&timebuf->time) == (time_t) -1 && errno != 0)
    return -1;
  timebuf->millitm = 0;

  if (__localtime_r (&timebuf->time, &tp) == NULL)
    return -1;

  timebuf->timezone = tp.tm_gmtoff / 60;
  timebuf->dstflag = tp.tm_isdst;

  __set_errno (save);
  return 0;
}