1/*	$NetBSD: linux_time.c,v 1.34 2010/07/12 12:01:53 njoly Exp $ */
2
3/*-
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Emmanuel Dreyfus.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: linux_time.c,v 1.34 2010/07/12 12:01:53 njoly Exp $");
34
35#include <sys/param.h>
36#include <sys/ucred.h>
37#include <sys/kauth.h>
38#include <sys/mount.h>
39#include <sys/signal.h>
40#include <sys/stdint.h>
41#include <sys/time.h>
42#include <sys/systm.h>
43#include <sys/sched.h>
44#include <sys/syscallargs.h>
45#include <sys/lwp.h>
46#include <sys/proc.h>
47
48#include <compat/linux/common/linux_types.h>
49#include <compat/linux/common/linux_signal.h>
50#include <compat/linux/common/linux_machdep.h>
51#include <compat/linux/common/linux_sched.h>
52#include <compat/linux/common/linux_ipc.h>
53#include <compat/linux/common/linux_sem.h>
54
55#include <compat/linux/linux_syscallargs.h>
56
57#include <compat/common/compat_util.h>
58
59/*
60 * This is not implemented for alpha yet
61 */
62#if defined (__i386__) || defined (__m68k__) || \
63    defined (__powerpc__) || defined (__mips__) || \
64    defined(__arm__) || defined(__amd64__)
65
66/*
67 * Linux keeps track of a system timezone in the kernel. It is readen
68 * by gettimeofday and set by settimeofday. This emulates this behavior
69 * See linux/kernel/time.c
70 */
71struct timezone linux_sys_tz;
72
73int
74linux_sys_gettimeofday(struct lwp *l, const struct linux_sys_gettimeofday_args *uap, register_t *retval)
75{
76	/* {
77		syscallarg(struct timeval50 *) tz;
78		syscallarg(struct timezone *) tzp;
79	} */
80	int error = 0;
81
82	if (SCARG(uap, tp)) {
83		error = compat_50_sys_gettimeofday(l, (const void *)uap, retval);
84		if (error)
85			return (error);
86	}
87
88	if (SCARG(uap, tzp)) {
89		error = copyout(&linux_sys_tz, SCARG(uap, tzp), sizeof(linux_sys_tz));
90		if (error)
91			return (error);
92   }
93
94	return (0);
95}
96
97int
98linux_sys_settimeofday(struct lwp *l, const struct linux_sys_settimeofday_args *uap, register_t *retval)
99{
100	/* {
101		syscallarg(struct timeval50 *) tp;
102		syscallarg(struct timezone *) tzp;
103	} */
104	int error = 0;
105
106	if (SCARG(uap, tp)) {
107		error = compat_50_sys_settimeofday(l, (const void *)uap, retval);
108		if (error)
109			return (error);
110	}
111
112	/*
113	 * If user is not the superuser, we returned
114	 * after the sys_settimeofday() call.
115	 */
116	if (SCARG(uap, tzp)) {
117		error = copyin(SCARG(uap, tzp), &linux_sys_tz, sizeof(linux_sys_tz));
118		if (error)
119			return (error);
120	}
121
122	return (0);
123}
124
125#endif /* __i386__ || __m68k__ || __powerpc__ || __mips__ || __arm__ */
126
127void
128native_to_linux_timespec(struct linux_timespec *ltp, struct timespec *ntp)
129{
130	ltp->tv_sec = ntp->tv_sec;
131	ltp->tv_nsec = ntp->tv_nsec;
132}
133
134void
135linux_to_native_timespec(struct timespec *ntp, struct linux_timespec *ltp)
136{
137	ntp->tv_sec = ltp->tv_sec;
138	ntp->tv_nsec = ltp->tv_nsec;
139}
140
141int
142linux_sys_nanosleep(struct lwp *l, const struct linux_sys_nanosleep_args *uap,
143    register_t *retval)
144{
145	/* {
146		syscallarg(struct linux_timespec *) rqtp;
147		syscallarg(struct linux_timespec *) rmtp;
148	} */
149	struct timespec rqts, rmts;
150	struct linux_timespec lrqts, lrmts;
151	int error, error1;
152
153	error = copyin(SCARG(uap, rqtp), &lrqts, sizeof(lrqts));
154	if (error != 0)
155		return error;
156	linux_to_native_timespec(&rqts, &lrqts);
157
158	error = nanosleep1(l, &rqts, SCARG(uap, rmtp) ? &rmts : NULL);
159	if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR))
160		return error;
161
162	native_to_linux_timespec(&lrmts, &rmts);
163	error1 = copyout(&lrmts, SCARG(uap, rmtp), sizeof(lrmts));
164	return error1 ? error1 : error;
165}
166
167int
168linux_to_native_clockid(clockid_t *n, clockid_t l)
169{
170	switch (l) {
171	case LINUX_CLOCK_REALTIME:
172		*n = CLOCK_REALTIME;
173		break;
174	case LINUX_CLOCK_MONOTONIC:
175		*n = CLOCK_MONOTONIC;
176		break;
177	case LINUX_CLOCK_PROCESS_CPUTIME_ID:
178	case LINUX_CLOCK_THREAD_CPUTIME_ID:
179	case LINUX_CLOCK_REALTIME_HR:
180	case LINUX_CLOCK_MONOTONIC_HR:
181	default:
182		return EINVAL;
183	}
184
185	return 0;
186}
187
188int
189linux_sys_clock_gettime(struct lwp *l, const struct linux_sys_clock_gettime_args *uap, register_t *retval)
190{
191	/* {
192		syscallarg(clockid_t) which;
193		syscallarg(struct linux_timespec *)tp;
194	} */
195	int error;
196	clockid_t id;
197	struct timespec ts;
198	struct linux_timespec lts;
199
200	error = linux_to_native_clockid(&id, SCARG(uap, which));
201	if (error != 0)
202		return error;
203
204	error = clock_gettime1(id, &ts);
205	if (error != 0)
206		return error;
207
208	native_to_linux_timespec(&lts, &ts);
209	return copyout(&lts, SCARG(uap, tp), sizeof lts);
210}
211
212int
213linux_sys_clock_settime(struct lwp *l, const struct linux_sys_clock_settime_args *uap, register_t *retval)
214{
215	/* {
216		syscallarg(clockid_t) which;
217		syscallarg(struct linux_timespec *)tp;
218	} */
219	struct timespec ts;
220	struct linux_timespec lts;
221	clockid_t id;
222	int error;
223
224	error = linux_to_native_clockid(&id, SCARG(uap, which));
225	if (error != 0)
226		return error;
227
228	error = copyin(SCARG(uap, tp), &lts, sizeof lts);
229	if (error != 0)
230		return error;
231
232	linux_to_native_timespec(&ts, &lts);
233
234	return clock_settime1(l->l_proc, id, &ts, true);
235}
236
237int
238linux_sys_clock_getres(struct lwp *l, const struct linux_sys_clock_getres_args *uap, register_t *retval)
239{
240	/* {
241		syscallarg(clockid_t) which;
242		syscallarg(struct linux_timespec *)tp;
243	} */
244	struct timespec ts;
245	struct linux_timespec lts;
246	int error;
247	clockid_t nwhich = 0;	/* XXX: GCC */
248
249	error = linux_to_native_clockid(&nwhich, SCARG(uap, which));
250	if (error != 0 || SCARG(uap, tp) == NULL)
251		return error;
252
253	error = clock_getres1(nwhich, &ts);
254	if (error != 0)
255		return error;
256
257	native_to_linux_timespec(&lts, &ts);
258	return copyout(&lts, SCARG(uap, tp), sizeof lts);
259}
260
261int
262linux_sys_clock_nanosleep(struct lwp *l, const struct linux_sys_clock_nanosleep_args *uap, register_t *retval)
263{
264	/* {
265		syscallarg(clockid_t) which;
266		syscallarg(int) flags;
267		syscallarg(struct linux_timespec) *rqtp;
268		syscallarg(struct linux_timespec) *rmtp;
269	} */
270	struct linux_timespec lrqts, lrmts;
271	struct timespec rqts, rmts;
272	int error, error1;
273	clockid_t nwhich;
274
275	if (SCARG(uap, flags) != 0)
276		return EINVAL;		/* XXX deal with TIMER_ABSTIME */
277
278	error = linux_to_native_clockid(&nwhich, SCARG(uap, which));
279	if (error != 0)
280		return error;
281
282	error = copyin(SCARG(uap, rqtp), &lrqts, sizeof lrqts);
283	if (error != 0)
284		return error;
285
286	linux_to_native_timespec(&rqts, &lrqts);
287
288	error = nanosleep1(l, &rqts, SCARG(uap, rmtp) ? &rmts : NULL);
289	if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR))
290		return error;
291
292	native_to_linux_timespec(&lrmts, &rmts);
293	error1 = copyout(&lrmts, SCARG(uap, rmtp), sizeof lrmts);
294	return error1 ? error1 : error;
295}
296