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 | |
29 | static time_t |
30 | time_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); |
38 | libc_ifunc (time, |
39 | vdso_time ? VDSO_IFUNC_RET (vdso_time) |
40 | : (void *) time_syscall); |
41 | |
42 | # else |
43 | time_t |
44 | time (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 | |