1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006 David Xu <davidxu@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29
30#include <sys/types.h>
31#include <sys/syscall.h>
32
33#include "namespace.h"
34#include <errno.h>
35#include <stddef.h>
36#include <signal.h>
37#include <stdlib.h>
38#include <time.h>
39#include "sigev_thread.h"
40#include "un-namespace.h"
41
42extern int __sys_ktimer_create(clockid_t, struct sigevent *__restrict,
43	int *__restrict);
44extern int __sys_ktimer_delete(int);
45extern int __sys_ktimer_gettime(int, struct itimerspec *);
46extern int __sys_ktimer_getoverrun(int);
47extern int __sys_ktimer_settime(int, int,
48	const struct itimerspec *__restrict, struct itimerspec *__restrict);
49
50struct __timer {
51	int oshandle;
52	struct sigev_node *node;
53};
54
55__weak_reference(__timer_create, timer_create);
56__weak_reference(__timer_create, _timer_create);
57__weak_reference(__timer_delete, timer_delete);
58__weak_reference(__timer_delete, _timer_delete);
59__weak_reference(__timer_gettime, timer_gettime);
60__weak_reference(__timer_gettime, _timer_gettime);
61__weak_reference(__timer_settime, timer_settime);
62__weak_reference(__timer_settime, _timer_settime);
63__weak_reference(__timer_getoverrun, timer_getoverrun);
64__weak_reference(__timer_getoverrun, _timer_getoverrun);
65
66typedef void (*timer_func)(union sigval val, int overrun);
67
68static void
69timer_dispatch(struct sigev_node *sn)
70{
71	timer_func f = sn->sn_func;
72
73	/* I want to avoid expired notification. */
74	if (sn->sn_info.si_value.sival_int == sn->sn_gen)
75		f(sn->sn_value, sn->sn_info.si_overrun);
76}
77
78int
79__timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
80{
81	struct __timer *timer;
82	struct sigevent ev;
83	struct sigev_node *sn;
84	int ret, err;
85
86	timer = malloc(sizeof(struct __timer));
87	if (timer == NULL)
88		return (-1);
89
90	if (evp == NULL || evp->sigev_notify != SIGEV_THREAD) {
91		ret = __sys_ktimer_create(clockid, evp, &timer->oshandle);
92		if (ret == -1) {
93			err = errno;
94			free(timer);
95			errno = err;
96			return (ret);
97		}
98		timer->node = NULL;
99		*timerid = timer;
100		return (0);
101	}
102
103	if (__sigev_check_init()) {
104		free(timer);
105		errno = EINVAL;
106		return (-1);
107	}
108
109	sn = __sigev_alloc(SI_TIMER, evp, NULL, 0);
110	if (sn == NULL) {
111		free(timer);
112		errno = EAGAIN;
113		return (-1);
114	}
115
116	__sigev_get_sigevent(sn, &ev, sn->sn_gen);
117	ret = __sys_ktimer_create(clockid, &ev, &timer->oshandle);
118	if (ret != 0) {
119		err = errno;
120		__sigev_free(sn);
121		free(timer);
122		errno = err;
123		return (-1);
124	}
125	sn->sn_flags |= SNF_SYNC;
126	sn->sn_dispatch = timer_dispatch;
127	sn->sn_id = timer->oshandle;
128	timer->node = sn;
129	__sigev_list_lock();
130	__sigev_register(sn);
131	__sigev_list_unlock();
132	*timerid = timer;
133	return (0);
134}
135
136int
137__timer_delete(timer_t timerid)
138{
139	int ret, err;
140
141	if (timerid->node != NULL) {
142		__sigev_list_lock();
143		__sigev_delete_node(timerid->node);
144		__sigev_list_unlock();
145	}
146	ret = __sys_ktimer_delete(timerid->oshandle);
147	err = errno;
148	free(timerid);
149	errno = err;
150	return (ret);
151}
152
153int
154__timer_gettime(timer_t timerid, struct itimerspec *value)
155{
156
157	return __sys_ktimer_gettime(timerid->oshandle, value);
158}
159
160int
161__timer_getoverrun(timer_t timerid)
162{
163
164	return __sys_ktimer_getoverrun(timerid->oshandle);
165}
166
167int
168__timer_settime(timer_t timerid, int flags,
169	const struct itimerspec *__restrict value,
170	struct itimerspec *__restrict ovalue)
171{
172
173	return __sys_ktimer_settime(timerid->oshandle,
174		flags, value, ovalue);
175}
176
177#pragma weak timer_oshandle_np
178int
179timer_oshandle_np(timer_t timerid)
180{
181
182	return (timerid->oshandle);
183}
184