1/* gettimeofday - set time. Linux version.
2 Copyright (C) 2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19/* Optimize the function call by setting the PLT directly to vDSO symbol. */
20#ifdef USE_IFUNC_GETTIMEOFDAY
21# include <time.h>
22# include <string.h>
23# include <sysdep.h>
24# include <sysdep-vdso.h>
25
26# ifdef SHARED
27# include <dl-vdso.h>
28# include <libc-vdso.h>
29
30static int
31__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
32{
33 if (__glibc_unlikely (tz != 0))
34 memset (tz, 0, sizeof *tz);
35 return INLINE_SYSCALL_CALL (gettimeofday, tv, tz);
36}
37
38# undef INIT_ARCH
39# define INIT_ARCH() \
40 void *vdso_gettimeofday = dl_vdso_vsym (HAVE_GETTIMEOFDAY_VSYSCALL)
41libc_ifunc (__gettimeofday,
42 vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday)
43 : (void *) __gettimeofday_syscall)
44
45# else
46int
47__gettimeofday (struct timeval *restrict tv, void *restrict tz)
48{
49 if (__glibc_unlikely (tz != 0))
50 memset (tz, 0, sizeof *tz);
51
52 return INLINE_VSYSCALL (gettimeofday, 2, tv, tz);
53}
54# endif
55weak_alias (__gettimeofday, gettimeofday)
56#else /* USE_IFUNC_GETTIMEOFDAY */
57# include <time/gettimeofday.c>
58#endif
59