| 1 | /* time -- Get number of seconds since Epoch. Linux version. |
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| 2 | Copyright (C) 2020-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* Optimize the function call by setting the PLT directly to vDSO symbol. */ |
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| 20 | #ifdef USE_IFUNC_TIME |
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| 21 | # include <time.h> |
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| 22 | # include <sysdep.h> |
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| 23 | # include <sysdep-vdso.h> |
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| 24 | |
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| 25 | #ifdef SHARED |
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| 26 | # include <dl-vdso.h> |
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| 27 | # include <libc-vdso.h> |
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| 28 | |
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| 29 | static time_t |
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| 30 | time_syscall (time_t *t) |
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| 31 | { |
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| 32 | return INLINE_SYSCALL_CALL (time, t); |
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| 33 | } |
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| 34 | |
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| 35 | # undef INIT_ARCH |
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| 36 | # define INIT_ARCH() \ |
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| 37 | void *vdso_time = dl_vdso_vsym (HAVE_TIME_VSYSCALL); |
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| 38 | libc_ifunc (time, |
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| 39 | vdso_time ? VDSO_IFUNC_RET (vdso_time) |
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| 40 | : (void *) time_syscall); |
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| 41 | |
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| 42 | # else |
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| 43 | time_t |
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| 44 | time (time_t *t) |
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| 45 | { |
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| 46 | return INLINE_VSYSCALL (time, 1, t); |
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| 47 | } |
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| 48 | # endif /* !SHARED */ |
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| 49 | #else /* USE_IFUNC_TIME */ |
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| 50 | # include <time.h> |
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| 51 | # include <time-clockid.h> |
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| 52 | # include <errno.h> |
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| 53 | |
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| 54 | /* Return the time now, and store it in *TIMER if not NULL. */ |
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| 55 | |
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| 56 | __time64_t |
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| 57 | __time64 (__time64_t *timer) |
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| 58 | { |
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| 59 | struct __timespec64 ts; |
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| 60 | __clock_gettime64 (TIME_CLOCK_GETTIME_CLOCKID, &ts); |
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| 61 | |
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| 62 | if (timer != NULL) |
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| 63 | *timer = ts.tv_sec; |
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| 64 | return ts.tv_sec; |
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| 65 | } |
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| 66 | |
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| 67 | # if __TIMESIZE != 64 |
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| 68 | libc_hidden_def (__time64) |
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| 69 | |
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| 70 | time_t |
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| 71 | __time (time_t *timer) |
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| 72 | { |
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| 73 | __time64_t t = __time64 (NULL); |
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| 74 | |
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| 75 | if (! in_time_t_range (t)) |
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| 76 | { |
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| 77 | __set_errno (EOVERFLOW); |
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| 78 | return -1; |
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| 79 | } |
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| 80 | |
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| 81 | if (timer != NULL) |
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| 82 | *timer = t; |
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| 83 | return t; |
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| 84 | } |
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| 85 | # endif |
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| 86 | weak_alias (__time, time) |
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| 87 | #endif |
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| 88 | |
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