1/* clock_adjtime -- tune kernel clock.
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 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; see the file COPYING.LIB. If
17 not, see <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <stdlib.h>
21#include <time.h>
22#include <sysdep.h>
23#include <sys/timex.h>
24#include <kernel-features.h>
25
26int
27__clock_adjtime64 (const clockid_t clock_id, struct __timex64 *tx64)
28{
29#ifndef __NR_clock_adjtime64
30# define __NR_clock_adjtime64 __NR_clock_adjtime
31#endif
32 int r = INLINE_SYSCALL_CALL (clock_adjtime64, clock_id, tx64);
33#ifndef __ASSUME_TIME64_SYSCALLS
34 if (r >= 0 || errno != ENOSYS)
35 return r;
36
37 if (tx64->modes & ADJ_SETOFFSET
38 && ! in_time_t_range (tx64->time.tv_sec))
39 {
40 __set_errno (EOVERFLOW);
41 return -1;
42 }
43
44 struct timex tx32 = valid_timex64_to_timex (*tx64);
45 r = INLINE_SYSCALL_CALL (clock_adjtime, clock_id, &tx32);
46 if (r >= 0)
47 *tx64 = valid_timex_to_timex64 (tx32);
48#endif
49 return r;
50}
51
52#if __TIMESIZE != 64
53libc_hidden_def (__clock_adjtime64)
54
55int
56__clock_adjtime (const clockid_t clock_id, struct timex *tx)
57{
58 struct __timex64 tx64;
59 int retval;
60
61 tx64 = valid_timex_to_timex64 (*tx);
62 retval = __clock_adjtime64 (clock_id, &tx64);
63 if (retval >= 0)
64 *tx = valid_timex64_to_timex (tx64);
65
66 return retval;
67}
68#endif
69libc_hidden_def (__clock_adjtime);
70strong_alias (__clock_adjtime, clock_adjtime)
71