1/* time -- Get number of seconds since Epoch. 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
7 License as published by the Free Software Foundation; either
8 version 2.1 of the 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_TIME
21# include <time.h>
22# include <sysdep.h>
23# include <sysdep-vdso.h>
24
25#ifdef SHARED
26# include <dl-vdso.h>
27# include <libc-vdso.h>
28
29static time_t
30time_syscall (time_t *t)
31{
32 return INLINE_SYSCALL_CALL (time, t);
33}
34
35# undef INIT_ARCH
36# define INIT_ARCH() \
37 void *vdso_time = dl_vdso_vsym (HAVE_TIME_VSYSCALL);
38libc_ifunc (time,
39 vdso_time ? VDSO_IFUNC_RET (vdso_time)
40 : (void *) time_syscall);
41
42# else
43time_t
44time (time_t *t)
45{
46 return INLINE_VSYSCALL (time, 1, t);
47}
48# endif /* !SHARED */
49#else /* USE_IFUNC_TIME */
50# include <time/time.c>
51#endif
52