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/* gettimeofday - set time. Linux version.
Copyright (C) 2020 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/>. */
/* Optimize the function call by setting the PLT directly to vDSO symbol. */
#ifdef USE_IFUNC_GETTIMEOFDAY
# include <time.h>
# include <string.h>
# include <sysdep.h>
# include <sysdep-vdso.h>
# ifdef SHARED
# include <dl-vdso.h>
static int
__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
{
if (__glibc_unlikely (tz != 0))
memset (tz, 0, sizeof *tz);
return INLINE_SYSCALL_CALL (gettimeofday, tv, tz);
}
# undef INIT_ARCH
# define INIT_ARCH() \
void *vdso_gettimeofday = get_vdso_symbol (HAVE_GETTIMEOFDAY_VSYSCALL)
libc_ifunc (__gettimeofday,
vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday)
: (void *) __gettimeofday_syscall)
# else
int
__gettimeofday (struct timeval *restrict tv, void *restrict tz)
{
if (__glibc_unlikely (tz != 0))
memset (tz, 0, sizeof *tz);
return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
}
# endif
weak_alias (__gettimeofday, gettimeofday)
#else /* USE_IFUNC_GETTIMEOFDAY */
# include <time/gettimeofday.c>
#endif
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