glibc/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c

/* Copyright (C) 2018-2019 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
   <https://www.gnu.org/licenses/>.  */

/* 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.  */

#include <sys/time.h>

#ifdef SHARED

# include <dl-vdso.h>
# include <sysdep-vdso.h>

/* Used as a fallback in the ifunc resolver if VDSO is not available
   and for libc.so internal __gettimeofday calls.  */

static int
__gettimeofday_vsyscall (struct timeval *tv, struct timezone *tz)
{
  return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
}

# define INIT_ARCH()
libc_ifunc_hidden (__gettimeofday, __gettimeofday,
		   (get_vdso_symbol ("__kernel_gettimeofday")
		    ?: __gettimeofday_vsyscall))
libc_hidden_def (__gettimeofday)

#else

# include <sysdep.h>
int
__gettimeofday (struct timeval *tv, struct timezone *tz)
{
  return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
}
libc_hidden_def (__gettimeofday)

#endif

weak_alias (__gettimeofday, gettimeofday)
libc_hidden_weak (gettimeofday)