mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-19 09:20:07 +00:00
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* Copyright (C) 2005-2017 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 (linux2615, "LINUX_2.6.15", 123718565); \
|
|
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)
|