[mirror_ubuntu-bionic-kernel.git] / kernel / time / posix-stubs.c

/*
 * Dummy stubs used when CONFIG_POSIX_TIMERS=n
 *
 * Created by:  Nicolas Pitre, July 2016
 * Copyright:   (C) 2016 Linaro Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/syscalls.h>
#include <linux/ktime.h>
#include <linux/timekeeping.h>
#include <linux/posix-timers.h>

asmlinkage long sys_ni_posix_timers(void)
{
	pr_err_once("process %d (%s) attempted a POSIX timer syscall "
		    "while CONFIG_POSIX_TIMERS is not set\n",
		    current->pid, current->comm);
	return -ENOSYS;
}

#define SYS_NI(name)  SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)

SYS_NI(timer_create);
SYS_NI(timer_gettime);
SYS_NI(timer_getoverrun);
SYS_NI(timer_settime);
SYS_NI(timer_delete);
SYS_NI(clock_adjtime);
SYS_NI(getitimer);
SYS_NI(setitimer);
#ifdef __ARCH_WANT_SYS_ALARM
SYS_NI(alarm);
#endif

/*
 * We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC
 * as it is easy to remain compatible with little code. CLOCK_BOOTTIME
 * is also included for convenience as at least systemd uses it.
 */

SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
		const struct timespec __user *, tp)
{
	struct timespec64 new_tp64;
	struct timespec new_tp;

	if (which_clock != CLOCK_REALTIME)
		return -EINVAL;
	if (copy_from_user(&new_tp, tp, sizeof (*tp)))
		return -EFAULT;

	new_tp64 = timespec_to_timespec64(new_tp);
	return do_sys_settimeofday64(&new_tp64, NULL);
}

SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
		struct timespec __user *,tp)
{
	struct timespec64 kernel_tp64;
	struct timespec kernel_tp;

	switch (which_clock) {
	case CLOCK_REALTIME: ktime_get_real_ts64(&kernel_tp64); break;
	case CLOCK_MONOTONIC: ktime_get_ts64(&kernel_tp64); break;
	case CLOCK_BOOTTIME: get_monotonic_boottime64(&kernel_tp64); break;
	default: return -EINVAL;
	}

	kernel_tp = timespec64_to_timespec(kernel_tp64);
	if (copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
		return -EFAULT;
	return 0;
}

SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp)
{
	struct timespec rtn_tp = {
		.tv_sec = 0,
		.tv_nsec = hrtimer_resolution,
	};

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		if (copy_to_user(tp, &rtn_tp, sizeof(rtn_tp)))
			return -EFAULT;
		return 0;
	default:
		return -EINVAL;
	}
}

SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
		const struct timespec __user *, rqtp,
		struct timespec __user *, rmtp)
{
	struct timespec64 t64;
	struct timespec t;

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
			return -EFAULT;
		t64 = timespec_to_timespec64(t);
		if (!timespec64_valid(&t64))
			return -EINVAL;
		return hrtimer_nanosleep(&t64, rmtp, flags & TIMER_ABSTIME ?
					 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
					 which_clock);
	default:
		return -EINVAL;
	}
}

#ifdef CONFIG_COMPAT
long clock_nanosleep_restart(struct restart_block *restart_block)
{
	return hrtimer_nanosleep_restart(restart_block);
}
#endif
Commit	Line	Data
baa73d9e NP	1	/*
	2	* Dummy stubs used when CONFIG_POSIX_TIMERS=n
	3	*
	4	* Created by: Nicolas Pitre, July 2016
	5	* Copyright: (C) 2016 Linaro Limited
	6	*
	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.
	10	*/
	11
	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>
	20
	21	asmlinkage long sys_ni_posix_timers(void)
	22	{
	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);
	26	return -ENOSYS;
	27	}
	28
	29	#define SYS_NI(name) SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)
	30
	31	SYS_NI(timer_create);
	32	SYS_NI(timer_gettime);
	33	SYS_NI(timer_getoverrun);
	34	SYS_NI(timer_settime);
	35	SYS_NI(timer_delete);
	36	SYS_NI(clock_adjtime);
	37	SYS_NI(getitimer);
	38	SYS_NI(setitimer);
	39	#ifdef __ARCH_WANT_SYS_ALARM
	40	SYS_NI(alarm);
	41	#endif
	42
	43	/*
	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.
	47	*/
	48
	49	SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
	50	const struct timespec __user *, tp)
	51	{
2ac00f17	52	struct timespec64 new_tp64;
baa73d9e NP	53	struct timespec new_tp;
	54
	55	if (which_clock != CLOCK_REALTIME)
	56	return -EINVAL;
	57	if (copy_from_user(&new_tp, tp, sizeof (*tp)))
	58	return -EFAULT;
2ac00f17 DD	59
	60	new_tp64 = timespec_to_timespec64(new_tp);
	61	return do_sys_settimeofday64(&new_tp64, NULL);
baa73d9e NP	62	}
	63
	64	SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
	65	struct timespec __user *,tp)
	66	{
3c9c12f4	67	struct timespec64 kernel_tp64;
baa73d9e NP	68	struct timespec kernel_tp;
	69
	70	switch (which_clock) {
3c9c12f4 DD	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;
baa73d9e NP	74	default: return -EINVAL;
baa73d9e NP	75	}
3c9c12f4 DD	76
3c9c12f4 DD	77	kernel_tp = timespec64_to_timespec(kernel_tp64);
baa73d9e NP	78	if (copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
	79	return -EFAULT;
	80	return 0;
	81	}
	82
	83	SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp)
	84	{
	85	struct timespec rtn_tp = {
	86	.tv_sec = 0,
	87	.tv_nsec = hrtimer_resolution,
	88	};
	89
	90	switch (which_clock) {
	91	case CLOCK_REALTIME:
	92	case CLOCK_MONOTONIC:
	93	case CLOCK_BOOTTIME:
	94	if (copy_to_user(tp, &rtn_tp, sizeof(rtn_tp)))
	95	return -EFAULT;
	96	return 0;
	97	default:
	98	return -EINVAL;
	99	}
	100	}
	101
	102	SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
	103	const struct timespec __user *, rqtp,
	104	struct timespec __user *, rmtp)
	105	{
ad196384	106	struct timespec64 t64;
baa73d9e NP	107	struct timespec t;
	108
	109	switch (which_clock) {
	110	case CLOCK_REALTIME:
	111	case CLOCK_MONOTONIC:
	112	case CLOCK_BOOTTIME:
	113	if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
	114	return -EFAULT;
ad196384 DD	115	t64 = timespec_to_timespec64(t);
ad196384 DD	116	if (!timespec64_valid(&t64))
baa73d9e	117	return -EINVAL;
ad196384	118	return hrtimer_nanosleep(&t64, rmtp, flags & TIMER_ABSTIME ?
baa73d9e NP	119	HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
	120	which_clock);
	121	default:
	122	return -EINVAL;
	123	}
	124	}
	125
	126	#ifdef CONFIG_COMPAT
	127	long clock_nanosleep_restart(struct restart_block *restart_block)
	128	{
	129	return hrtimer_nanosleep_restart(restart_block);
	130	}
	131	#endif