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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2018 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Implement timeout(9f), untimeout(9f) on top of
* libc timer_create, timer_settime, etc.
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <time.h>
typedef void (*sigev_notify_func_t)(union sigval);
/*
* We never actually reference anything in this array, using it
* just as a collection of addresses mapped from/to int values.
* It would be fine to take addresses even beyond the end, but
* to avoid confusion it's sized larger than _TIMER_MAX (32).
*/
static char timeout_base[100];
timeout_id_t
timeout(void (*func)(void *), void *arg, clock_t delta)
{
struct sigevent sev;
struct itimerspec its;
timer_t tid;
int err;
if (delta <= 0)
return (NULL);
bzero(&sev, sizeof (sev));
sev.sigev_notify = SIGEV_THREAD;
sev.sigev_value.sival_ptr = arg;
sev.sigev_notify_function = (sigev_notify_func_t)(uintptr_t)func;
err = timer_create(CLOCK_REALTIME, &sev, &tid);
if (err != 0)
return (NULL);
bzero(&its, sizeof (its));
TICK_TO_TIMESTRUC(delta, &its.it_value);
err = timer_settime(tid, 0, &its, NULL);
if (err != 0) {
(void) timer_delete(tid);
return (NULL);
}
/* Convert return to a (sort of) pointer */
return (timeout_base + tid);
}
clock_t
untimeout(timeout_id_t id_arg)
{
struct itimerspec its, oits;
char *id_cp = id_arg;
clock_t delta;
timer_t tid;
int rc;
if (id_arg == NULL)
return (-1);
/* Convert id_arg back to small integer. */
tid = (int)(id_cp - timeout_base);
bzero(&its, sizeof (its));
bzero(&oits, sizeof (oits));
rc = timer_settime(tid, 0, &its, &oits);
if (rc != 0) {
delta = 0;
} else {
delta = TIMESTRUC_TO_TICK(&oits.it_value);
if (delta < 0)
delta = 0;
}
rc = timer_delete(tid);
if (rc != 0)
delta = -1;
return (delta);
}
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