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> |
28 | # include <libc-vdso.h> |
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() \ |
40 | void *vdso_gettimeofday = dl_vdso_vsym (HAVE_GETTIMEOFDAY_VSYSCALL) |
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 |
59 | |