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
30static 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)
41libc_ifunc (__gettimeofday,
42 vdso_gettimeofday ? VDSO_IFUNC_RET (vdso_gettimeofday)
43 : (void *) __gettimeofday_syscall)
44
45# else
46int
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
55weak_alias (__gettimeofday, gettimeofday)
56#else /* USE_IFUNC_GETTIMEOFDAY */
57/* Conversion of gettimeofday function to support 64 bit time on archs
58 with __WORDSIZE == 32 and __TIMESIZE == 32/64 */
59#include <errno.h>
60
61int
62__gettimeofday64 (struct __timeval64 *restrict tv, void *restrict tz)
63{
64 if (__glibc_unlikely (tz != 0))
65 memset (tz, 0, sizeof (struct timezone));
66
67 struct __timespec64 ts64;
68 if (__clock_gettime64 (CLOCK_REALTIME, &ts64))
69 return -1;
70
71 *tv = timespec64_to_timeval64 (ts64);
72 return 0;
73}
74
75# if __TIMESIZE != 64
76libc_hidden_def (__gettimeofday64)
77
78int
79__gettimeofday (struct timeval *restrict tv, void *restrict tz)
80{
81 struct __timeval64 tv64;
82 if (__gettimeofday64 (&tv64, tz))
83 return -1;
84
85 if (! in_time_t_range (tv64.tv_sec))
86 {
87 __set_errno (EOVERFLOW);
88 return -1;
89 }
90
91 *tv = valid_timeval64_to_timeval (tv64);
92 return 0;
93}
94# endif
95weak_alias (__gettimeofday, gettimeofday)
96#endif
97