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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include "lint.h"
     30 #include <time.h>
     31 #include <sys/types.h>
     32 #include <stdlib.h>
     33 #include <string.h>
     34 #include <errno.h>
     35 #include "sigev_thread.h"
     36 
     37 /*
     38  * System call wrappers found elsewhere in libc (common/sys/__clock_timer.s).
     39  */
     40 extern int __clock_getres(clockid_t, timespec_t *);
     41 extern int __clock_gettime(clockid_t, timespec_t *);
     42 extern int __clock_settime(clockid_t, const timespec_t *);
     43 extern int __timer_create(clockid_t, struct sigevent *, timer_t *);
     44 extern int __timer_delete(timer_t);
     45 extern int __timer_getoverrun(timer_t);
     46 extern int __timer_gettime(timer_t, itimerspec_t *);
     47 extern int __timer_settime(timer_t, int, const itimerspec_t *, itimerspec_t *);
     48 
     49 /*
     50  * Array of pointers to tcd's, indexed by timer id.
     51  * No more than 'timer_max' timers can be created by any process.
     52  */
     53 int timer_max = 0;
     54 thread_communication_data_t **timer_tcd;
     55 static pthread_once_t timer_once = PTHREAD_ONCE_INIT;
     56 
     57 static void
     58 timer_init(void)
     59 {
     60 	timer_max = (int)_sysconf(_SC_TIMER_MAX);
     61 	timer_tcd = malloc(timer_max * sizeof (*timer_tcd));
     62 	(void) memset(timer_tcd, 0, timer_max * sizeof (*timer_tcd));
     63 }
     64 
     65 int
     66 clock_getres(clockid_t clock_id, timespec_t *res)
     67 {
     68 	return (__clock_getres(clock_id, res));
     69 }
     70 
     71 int
     72 clock_gettime(clockid_t clock_id, timespec_t *tp)
     73 {
     74 	return (__clock_gettime(clock_id, tp));
     75 }
     76 
     77 int
     78 clock_settime(clockid_t clock_id, const timespec_t *tp)
     79 {
     80 	return (__clock_settime(clock_id, tp));
     81 }
     82 
     83 int
     84 timer_create(clockid_t clock_id, struct sigevent *sigevp, timer_t *timerid)
     85 {
     86 	struct sigevent sigevent;
     87 	port_notify_t port_notify;
     88 	thread_communication_data_t *tcdp;
     89 	int sigev_thread = 0;
     90 	int rc;
     91 
     92 	(void) pthread_once(&timer_once, timer_init);
     93 
     94 	if (sigevp != NULL &&
     95 	    sigevp->sigev_notify == SIGEV_THREAD &&
     96 	    sigevp->sigev_notify_function != NULL) {
     97 		sigev_thread = 1;
     98 		tcdp = setup_sigev_handler(sigevp, TIMER);
     99 		if (tcdp == NULL)
    100 			return (-1);
    101 		/* copy the sigevent structure so we can modify it */
    102 		sigevent = *sigevp;
    103 		sigevp = &sigevent;
    104 		port_notify.portnfy_port = tcdp->tcd_port;
    105 		port_notify.portnfy_user = NULL;
    106 		sigevp->sigev_value.sival_ptr = &port_notify;
    107 	}
    108 
    109 	rc = __timer_create(clock_id, sigevp, timerid);
    110 
    111 	if (sigev_thread) {
    112 		if (rc == 0) {
    113 			if ((rc = launch_spawner(tcdp)) != 0)
    114 				__timer_delete(*timerid);
    115 			else
    116 				timer_tcd[*timerid] = tcdp;
    117 		}
    118 		if (rc != 0)
    119 			free_sigev_handler(tcdp);
    120 	}
    121 
    122 	return (rc);
    123 }
    124 
    125 int
    126 timer_delete(timer_t timerid)
    127 {
    128 	int rc;
    129 
    130 	if ((rc = del_sigev_timer(timerid)) == 0)
    131 		return (__timer_delete(timerid));
    132 	else
    133 		return (rc);
    134 }
    135 
    136 int
    137 timer_getoverrun(timer_t timerid)
    138 {
    139 	return (__timer_getoverrun(timerid) + sigev_timer_getoverrun(timerid));
    140 }
    141 
    142 int
    143 timer_gettime(timer_t timerid, itimerspec_t *value)
    144 {
    145 	return (__timer_gettime(timerid, value));
    146 }
    147 
    148 int
    149 timer_settime(timer_t timerid, int flags, const itimerspec_t *value,
    150 	itimerspec_t *ovalue)
    151 {
    152 	return (__timer_settime(timerid, flags, value, ovalue));
    153 }
    154 
    155 /*
    156  * Cleanup after fork1() in the child process.
    157  */
    158 void
    159 postfork1_child_sigev_timer(void)
    160 {
    161 	thread_communication_data_t *tcdp;
    162 	int timer;
    163 
    164 	for (timer = 0; timer < timer_max; timer++) {
    165 		if ((tcdp = timer_tcd[timer]) != NULL) {
    166 			timer_tcd[timer] = NULL;
    167 			tcd_teardown(tcdp);
    168 		}
    169 	}
    170 }
    171