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c701bcc6 AZ |
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> | |
1bdda52f | 28 | # include <libc-vdso.h> |
c701bcc6 AZ |
29 | |
30 | static 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() \ | |
1bdda52f | 40 | void *vdso_gettimeofday = dl_vdso_vsym (HAVE_GETTIMEOFDAY_VSYSCALL) |
c701bcc6 AZ |
41 | libc_ifunc (__gettimeofday, |
42 | vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday) | |
43 | : (void *) __gettimeofday_syscall) | |
44 | ||
45 | # else | |
46 | int | |
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 | |
55 | weak_alias (__gettimeofday, gettimeofday) | |
56 | #else /* USE_IFUNC_GETTIMEOFDAY */ | |
57 | # include <time/gettimeofday.c> | |
58 | #endif |