1/*-
2 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: stable/11/sys/compat/cloudabi/cloudabi_clock.c 316327 2017-03-31 08:43:07Z ed $");
28
29#include <sys/param.h>
30#include <sys/proc.h>
31#include <sys/stdint.h>
32#include <sys/systm.h>
33#include <sys/syscallsubr.h>
34
35#include <contrib/cloudabi/cloudabi_types_common.h>
36
37#include <compat/cloudabi/cloudabi_proto.h>
38#include <compat/cloudabi/cloudabi_util.h>
39
40/* Converts a CloudABI clock ID to a FreeBSD clock ID. */
41static int
42cloudabi_convert_clockid(cloudabi_clockid_t in, clockid_t *out)
43{
44	switch (in) {
45	case CLOUDABI_CLOCK_MONOTONIC:
46		*out = CLOCK_MONOTONIC;
47		return (0);
48	case CLOUDABI_CLOCK_PROCESS_CPUTIME_ID:
49		*out = CLOCK_PROCESS_CPUTIME_ID;
50		return (0);
51	case CLOUDABI_CLOCK_REALTIME:
52		*out = CLOCK_REALTIME;
53		return (0);
54	case CLOUDABI_CLOCK_THREAD_CPUTIME_ID:
55		*out = CLOCK_THREAD_CPUTIME_ID;
56		return (0);
57	default:
58		return (EINVAL);
59	}
60}
61
62/* Converts a struct timespec to a CloudABI timestamp. */
63int
64cloudabi_convert_timespec(const struct timespec *in, cloudabi_timestamp_t *out)
65{
66	cloudabi_timestamp_t s, ns;
67
68	if (in->tv_sec < 0) {
69		/* Timestamps from before the Epoch cannot be expressed. */
70		*out = 0;
71		return (EOVERFLOW);
72	}
73	s = in->tv_sec;
74	ns = in->tv_nsec;
75	if (s > UINT64_MAX / 1000000000 ||
76	    (s == UINT64_MAX / 1000000000 && ns > UINT64_MAX % 1000000000)) {
77		/* Addition of seconds and nanoseconds would overflow. */
78		*out = UINT64_MAX;
79		return (EOVERFLOW);
80	}
81	*out = s * 1000000000 + ns;
82	return (0);
83}
84
85/* Fetches the time value of a clock. */
86int
87cloudabi_clock_time_get(struct thread *td, cloudabi_clockid_t clock_id,
88    cloudabi_timestamp_t *ret)
89{
90	struct timespec ts;
91	int error;
92	clockid_t clockid;
93
94	error = cloudabi_convert_clockid(clock_id, &clockid);
95	if (error != 0)
96		return (error);
97	error = kern_clock_gettime(td, clockid, &ts);
98	if (error != 0)
99		return (error);
100	return (cloudabi_convert_timespec(&ts, ret));
101}
102
103int
104cloudabi_sys_clock_res_get(struct thread *td,
105    struct cloudabi_sys_clock_res_get_args *uap)
106{
107	struct timespec ts;
108	cloudabi_timestamp_t cts;
109	int error;
110	clockid_t clockid;
111
112	error = cloudabi_convert_clockid(uap->clock_id, &clockid);
113	if (error != 0)
114		return (error);
115	error = kern_clock_getres(td, clockid, &ts);
116	if (error != 0)
117		return (error);
118	error = cloudabi_convert_timespec(&ts, &cts);
119	if (error != 0)
120		return (error);
121	memcpy(td->td_retval, &cts, sizeof(cts));
122	return (0);
123}
124
125int
126cloudabi_sys_clock_time_get(struct thread *td,
127    struct cloudabi_sys_clock_time_get_args *uap)
128{
129	cloudabi_timestamp_t ts;
130	int error;
131
132	error = cloudabi_clock_time_get(td, uap->clock_id, &ts);
133	memcpy(td->td_retval, &ts, sizeof(ts));
134	return (error);
135}
136