1/* time -- Get number of seconds since Epoch. Linux version.
2 Copyright (C) 2020-2021 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
29static time_t
30time_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);
38libc_ifunc (time,
39 vdso_time ? VDSO_IFUNC_RET (vdso_time)
40 : (void *) time_syscall);
41
42# else
43time_t
44time (time_t *t)
45{
46 return INLINE_VSYSCALL (time, 1, t);
47}
48# endif /* !SHARED */
49#else /* USE_IFUNC_TIME */
50# include <time.h>
51# include <time-clockid.h>
52# include <errno.h>
53
54/* Return the time now, and store it in *TIMER if not NULL. */
55
56__time64_t
57__time64 (__time64_t *timer)
58{
59 struct __timespec64 ts;
60 __clock_gettime64 (TIME_CLOCK_GETTIME_CLOCKID, &ts);
61
62 if (timer != NULL)
63 *timer = ts.tv_sec;
64 return ts.tv_sec;
65}
66
67# if __TIMESIZE != 64
68libc_hidden_def (__time64)
69
70time_t
71__time (time_t *timer)
72{
73 __time64_t t = __time64 (NULL);
74
75 if (! in_time_t_range (t))
76 {
77 __set_errno (EOVERFLOW);
78 return -1;
79 }
80
81 if (timer != NULL)
82 *timer = t;
83 return t;
84}
85# endif
86weak_alias (__time, time)
87#endif
88