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