1/* time -- Get number of seconds since Epoch. Linux/x86 version.
2 Copyright (C) 2015-2016 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 <http://www.gnu.org/licenses/>. */
18
19#include <time.h>
20
21#ifdef SHARED
22
23#include <dl-vdso.h>
24#include <errno.h>
25
26static time_t
27__time_syscall (time_t *t)
28{
29 INTERNAL_SYSCALL_DECL (err);
30 return INTERNAL_SYSCALL (time, err, 1, t);
31}
32
33void *time_ifunc (void) __asm__ ("time");
34
35void *
36time_ifunc (void)
37{
38 PREPARE_VERSION_KNOWN (linux26, LINUX_2_6);
39
40/* If the vDSO is not available we fall back on the syscall. */
41 return _dl_vdso_vsym ("__vdso_time", &linux26)
42 ?: (void*) &__time_syscall;
43}
44asm (".type time, %gnu_indirect_function");
45
46libc_ifunc_hidden_def(time)
47
48#else
49
50# include <sysdep.h>
51
52time_t
53time (time_t *t)
54{
55 INTERNAL_SYSCALL_DECL (err);
56 return INTERNAL_SYSCALL (time, err, 1, t);
57}
58
59#endif
60