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: releng/11.2/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. */
41 static int
42 cloudabi_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. */
63 int
64 cloudabi_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. */
86 int
87 cloudabi_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
103 int
104 cloudabi_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
125 int
126 cloudabi_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 }
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