2 * Dummy stubs used when CONFIG_POSIX_TIMERS=n
4 * Created by: Nicolas Pitre, July 2016
5 * Copyright: (C) 2016 Linaro Limited
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/linkage.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/errno.h>
16 #include <linux/syscalls.h>
17 #include <linux/ktime.h>
18 #include <linux/timekeeping.h>
19 #include <linux/posix-timers.h>
21 asmlinkage
long sys_ni_posix_timers(void)
23 pr_err_once("process %d (%s) attempted a POSIX timer syscall "
24 "while CONFIG_POSIX_TIMERS is not set\n",
25 current
->pid
, current
->comm
);
29 #define SYS_NI(name) SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)
32 SYS_NI(timer_gettime
);
33 SYS_NI(timer_getoverrun
);
34 SYS_NI(timer_settime
);
36 SYS_NI(clock_adjtime
);
39 #ifdef __ARCH_WANT_SYS_ALARM
44 * We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC
45 * as it is easy to remain compatible with little code. CLOCK_BOOTTIME
46 * is also included for convenience as at least systemd uses it.
49 SYSCALL_DEFINE2(clock_settime
, const clockid_t
, which_clock
,
50 const struct timespec __user
*, tp
)
52 struct timespec64 new_tp64
;
53 struct timespec new_tp
;
55 if (which_clock
!= CLOCK_REALTIME
)
57 if (copy_from_user(&new_tp
, tp
, sizeof (*tp
)))
60 new_tp64
= timespec_to_timespec64(new_tp
);
61 return do_sys_settimeofday64(&new_tp64
, NULL
);
64 SYSCALL_DEFINE2(clock_gettime
, const clockid_t
, which_clock
,
65 struct timespec __user
*,tp
)
67 struct timespec64 kernel_tp64
;
68 struct timespec kernel_tp
;
70 switch (which_clock
) {
71 case CLOCK_REALTIME
: ktime_get_real_ts64(&kernel_tp64
); break;
72 case CLOCK_MONOTONIC
: ktime_get_ts64(&kernel_tp64
); break;
73 case CLOCK_BOOTTIME
: get_monotonic_boottime64(&kernel_tp64
); break;
74 default: return -EINVAL
;
77 kernel_tp
= timespec64_to_timespec(kernel_tp64
);
78 if (copy_to_user(tp
, &kernel_tp
, sizeof (kernel_tp
)))
83 SYSCALL_DEFINE2(clock_getres
, const clockid_t
, which_clock
, struct timespec __user
*, tp
)
85 struct timespec rtn_tp
= {
87 .tv_nsec
= hrtimer_resolution
,
90 switch (which_clock
) {
94 if (copy_to_user(tp
, &rtn_tp
, sizeof(rtn_tp
)))
102 SYSCALL_DEFINE4(clock_nanosleep
, const clockid_t
, which_clock
, int, flags
,
103 const struct timespec __user
*, rqtp
,
104 struct timespec __user
*, rmtp
)
106 struct timespec64 t64
;
109 switch (which_clock
) {
111 case CLOCK_MONOTONIC
:
113 if (copy_from_user(&t
, rqtp
, sizeof (struct timespec
)))
115 t64
= timespec_to_timespec64(t
);
116 if (!timespec64_valid(&t64
))
118 return hrtimer_nanosleep(&t64
, rmtp
, flags
& TIMER_ABSTIME
?
119 HRTIMER_MODE_ABS
: HRTIMER_MODE_REL
,
127 long clock_nanosleep_restart(struct restart_block
*restart_block
)
129 return hrtimer_nanosleep_restart(restart_block
);