Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 67df65f887ac872130b4038f1e4be8d799f097e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
// SPDX-License-Identifier: GPL-2.0
/*
 * Dummy stubs used when CONFIG_POSIX_TIMERS=n
 *
 * Created by:  Nicolas Pitre, July 2016
 * Copyright:   (C) 2016 Linaro Limited
 */

#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>
#include <linux/compat.h>

#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
/* Architectures may override SYS_NI and COMPAT_SYS_NI */
#include <asm/syscall_wrapper.h>
#endif

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;
}

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

#ifndef COMPAT_SYS_NI
#define COMPAT_SYS_NI(name)  SYSCALL_ALIAS(compat_sys_##name, sys_ni_posix_timers)
#endif

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);
SYS_NI(clock_adjtime32);
#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 __kernel_timespec __user *, tp)
{
	struct timespec64 new_tp;

	if (which_clock != CLOCK_REALTIME)
		return -EINVAL;
	if (get_timespec64(&new_tp, tp))
		return -EFAULT;

	return do_sys_settimeofday64(&new_tp, NULL);
}

int do_clock_gettime(clockid_t which_clock, struct timespec64 *tp)
{
	switch (which_clock) {
	case CLOCK_REALTIME:
		ktime_get_real_ts64(tp);
		break;
	case CLOCK_MONOTONIC:
		ktime_get_ts64(tp);
		break;
	case CLOCK_BOOTTIME:
		ktime_get_boottime_ts64(tp);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
		struct __kernel_timespec __user *, tp)
{
	int ret;
	struct timespec64 kernel_tp;

	ret = do_clock_gettime(which_clock, &kernel_tp);
	if (ret)
		return ret;

	if (put_timespec64(&kernel_tp, tp))
		return -EFAULT;
	return 0;
}

SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct __kernel_timespec __user *, tp)
{
	struct timespec64 rtn_tp = {
		.tv_sec = 0,
		.tv_nsec = hrtimer_resolution,
	};

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		if (put_timespec64(&rtn_tp, tp))
			return -EFAULT;
		return 0;
	default:
		return -EINVAL;
	}
}

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

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		break;
	default:
		return -EINVAL;
	}

	if (get_timespec64(&t, rqtp))
		return -EFAULT;
	if (!timespec64_valid(&t))
		return -EINVAL;
	if (flags & TIMER_ABSTIME)
		rmtp = NULL;
	current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
	current->restart_block.nanosleep.rmtp = rmtp;
	return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
				 which_clock);
}

#ifdef CONFIG_COMPAT
COMPAT_SYS_NI(timer_create);
COMPAT_SYS_NI(getitimer);
COMPAT_SYS_NI(setitimer);
#endif

#ifdef CONFIG_COMPAT_32BIT_TIME
SYS_NI(timer_settime32);
SYS_NI(timer_gettime32);

SYSCALL_DEFINE2(clock_settime32, const clockid_t, which_clock,
		struct old_timespec32 __user *, tp)
{
	struct timespec64 new_tp;

	if (which_clock != CLOCK_REALTIME)
		return -EINVAL;
	if (get_old_timespec32(&new_tp, tp))
		return -EFAULT;

	return do_sys_settimeofday64(&new_tp, NULL);
}

SYSCALL_DEFINE2(clock_gettime32, clockid_t, which_clock,
		struct old_timespec32 __user *, tp)
{
	int ret;
	struct timespec64 kernel_tp;

	ret = do_clock_gettime(which_clock, &kernel_tp);
	if (ret)
		return ret;

	if (put_old_timespec32(&kernel_tp, tp))
		return -EFAULT;
	return 0;
}

SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock,
		struct old_timespec32 __user *, tp)
{
	struct timespec64 rtn_tp = {
		.tv_sec = 0,
		.tv_nsec = hrtimer_resolution,
	};

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		if (put_old_timespec32(&rtn_tp, tp))
			return -EFAULT;
		return 0;
	default:
		return -EINVAL;
	}
}

SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags,
		struct old_timespec32 __user *, rqtp,
		struct old_timespec32 __user *, rmtp)
{
	struct timespec64 t;

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		break;
	default:
		return -EINVAL;
	}

	if (get_old_timespec32(&t, rqtp))
		return -EFAULT;
	if (!timespec64_valid(&t))
		return -EINVAL;
	if (flags & TIMER_ABSTIME)
		rmtp = NULL;
	current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
	current->restart_block.nanosleep.compat_rmtp = rmtp;
	return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
				 which_clock);
}
#endif