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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup POSIX_PRIV_TIMERS Timers
*
* @brief Create a Per-Process Timer
*/
/*
* 14.2.2 Create a Per-Process Timer, P1003.1b-1993, p. 264
*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <rtems/posix/sigset.h>
#include <rtems/posix/timerimpl.h>
#include <rtems/score/thread.h>
#include <rtems/score/watchdogimpl.h>
#include <rtems/seterr.h>
#include <rtems/sysinit.h>
RTEMS_WEAK int _POSIX_Timer_Is_allowed(
clockid_t clock_id
)
{
int rc = 0;
/*
* Allow timer_create(CLOCK_REALTIME. ...) per POSIX by default
* on CLOCK_REALTIME or CLOCK_MONOTONIC.
*
* But per the FACE Technical Standard, POSIX timers should not be
* allowed on CLOCK_REALTIME for safety reasons. If the application
* configures that it wants the FACE behavior, then this method
* is overridden by <rtems/confdefs/timer.h>.
*/
if ( clock_id != CLOCK_REALTIME ) {
if ( clock_id != CLOCK_MONOTONIC ) {
rc = EINVAL;
}
}
return rc;
}
int timer_create(
clockid_t clock_id,
struct sigevent *__restrict evp,
timer_t *__restrict timerid
)
{
POSIX_Timer_Control *ptimer;
int rc;
rc = _POSIX_Timer_Is_allowed( clock_id );
if ( rc != 0 )
rtems_set_errno_and_return_minus_one( rc );
if ( !timerid )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* The data of the structure evp are checked in order to verify if they
* are coherent.
*/
if (evp != NULL) {
/* The structure has data */
if ( ( evp->sigev_notify != SIGEV_NONE ) &&
( evp->sigev_notify != SIGEV_SIGNAL ) ) {
/* The value of the field sigev_notify is not valid */
rtems_set_errno_and_return_minus_one( EINVAL );
}
if ( !evp->sigev_signo )
rtems_set_errno_and_return_minus_one( EINVAL );
if ( !is_valid_signo(evp->sigev_signo) )
rtems_set_errno_and_return_minus_one( EINVAL );
}
/*
* Allocate a timer
*/
ptimer = _POSIX_Timer_Allocate();
if ( !ptimer ) {
_Objects_Allocator_unlock();
rtems_set_errno_and_return_minus_one( EAGAIN );
}
/* The data of the created timer are stored to use them later */
ptimer->state = POSIX_TIMER_STATE_CREATE_NEW;
ptimer->thread_id = _Thread_Get_executing()->Object.id;
if ( evp != NULL ) {
ptimer->inf.sigev_notify = evp->sigev_notify;
ptimer->inf.sigev_signo = evp->sigev_signo;
ptimer->inf.sigev_value = evp->sigev_value;
}
ptimer->overrun = 0;
ptimer->timer_data.it_value.tv_sec = 0;
ptimer->timer_data.it_value.tv_nsec = 0;
ptimer->timer_data.it_interval.tv_sec = 0;
ptimer->timer_data.it_interval.tv_nsec = 0;
ptimer->clock_type = clock_id;
_Watchdog_Preinitialize( &ptimer->Timer, _Per_CPU_Get_snapshot() );
_Watchdog_Initialize( &ptimer->Timer, _POSIX_Timer_TSR );
_Objects_Open_u32(&_POSIX_Timer_Information, &ptimer->Object, 0);
*timerid = ptimer->Object.id;
_Objects_Allocator_unlock();
return 0;
}
static void _POSIX_Timer_Manager_initialization( void )
{
_Objects_Initialize_information( &_POSIX_Timer_Information );
}
RTEMS_SYSINIT_ITEM(
_POSIX_Timer_Manager_initialization,
RTEMS_SYSINIT_POSIX_TIMER,
RTEMS_SYSINIT_ORDER_MIDDLE
);
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