1 | /* time -- Get number of seconds since Epoch. Linux/x86 version. |
2 | Copyright (C) 2015-2019 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 | |
26 | static time_t |
27 | __time_syscall (time_t *t) |
28 | { |
29 | INTERNAL_SYSCALL_DECL (err); |
30 | return INTERNAL_SYSCALL (time, err, 1, t); |
31 | } |
32 | |
33 | # ifndef time_type |
34 | /* The i386 time.c includes this file with a defined time_type macro. |
35 | For x86_64 we have to define it to time as the internal symbol is the |
36 | ifunc'ed one. */ |
37 | # define time_type time |
38 | # endif |
39 | |
40 | #undef INIT_ARCH |
41 | #define INIT_ARCH() PREPARE_VERSION_KNOWN (linux26, LINUX_2_6); |
42 | /* If the vDSO is not available we fall back on the syscall. */ |
43 | libc_ifunc_hidden (time_type, time, |
44 | (_dl_vdso_vsym ("__vdso_time" , &linux26) |
45 | ?: &__time_syscall)) |
46 | libc_hidden_def (time) |
47 | |
48 | #else |
49 | |
50 | # include <sysdep.h> |
51 | |
52 | time_t |
53 | time (time_t *t) |
54 | { |
55 | INTERNAL_SYSCALL_DECL (err); |
56 | return INTERNAL_SYSCALL (time, err, 1, t); |
57 | } |
58 | |
59 | #endif |
60 | |