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/* Copyright (C) 2005-2019 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
<http://www.gnu.org/licenses/>. */
#if defined SHARED && !defined __powerpc64__
# define __gettimeofday __redirect___gettimeofday
#else
# define __redirect___gettimeofday __gettimeofday
#endif
#include <sys/time.h>
#ifdef SHARED
# include <dl-vdso.h>
# include <libc-vdso.h>
# include <dl-machine.h>
# ifndef __powerpc64__
# undef __gettimeofday
int
__gettimeofday_vsyscall (struct timeval *tv, struct timezone *tz)
{
return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
}
/* __GI___gettimeofday is defined as hidden and for ppc32 it enables the
compiler make a local call (symbol@local) for internal GLIBC usage. It
means the PLT won't be used and the ifunc resolver will be called directly.
For ppc64 a call to a function in another translation unit might use a
different toc pointer thus disallowing direct branchess and making internal
ifuncs calls safe. */
# undef libc_hidden_def
# define libc_hidden_def(name) \
__hidden_ver1 (__gettimeofday_vsyscall, __GI___gettimeofday, \
__gettimeofday_vsyscall);
# endif /* !__powerpc64__ */
static int
__gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
{
return INLINE_SYSCALL (gettimeofday, 2, tv, tz);
}
# define INIT_ARCH() \
PREPARE_VERSION_KNOWN (linux2615, LINUX_2_6_15); \
void *vdso_gettimeofday = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2615);
/* If the vDSO is not available we fall back syscall. */
libc_ifunc_hidden (__redirect___gettimeofday, __gettimeofday,
vdso_gettimeofday
? VDSO_IFUNC_RET (vdso_gettimeofday)
: (void *) __gettimeofday_syscall);
libc_hidden_def (__gettimeofday)
#else
# include <sysdep.h>
# include <errno.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)
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