/****************************************************************************
* sched/exit.c
*
* Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include <unistd.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/fs.h>
#include "os_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Global Variables
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Functionss
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: exit
*
* Description:
* The exit() function causes normal process termination
* and the value of status & 0377 is returned to the parent.
*
* All functions registered with atexit() and on_exit() are
* called, in the reverse order of their registration.
*
* All open streams are flushed and closed. Files created
* by tmpfile() are removed.
*
****************************************************************************/
void exit(int status)
{
#if CONFIG_NFILE_STREAMS > 0 || defined(CONFIG_SCHED_WAITPID) || defined(CONFIG_SCHED_ATEXIT)
_TCB *tcb = (_TCB*)g_readytorun.head;
#endif
/* Only the lower 8 bits of the exit status are used */
status &= 0xff;
/* Flush all streams (File descriptors will be closed when
* the TCB is deallocated.
*/
#if CONFIG_NFILE_STREAMS > 0
(void)lib_flushall(tcb->streams);
#endif
/* Wakeup any tasks waiting for this task to exit */
#ifdef CONFIG_SCHED_WAITPID /* Experimental */
while (tcb->exitsem.semcount < 0)
{
/* "If more than one thread is suspended in waitpid() awaiting
* termination of the same process, exactly one thread will return
* the process status at the time of the target process termination."
* Hmmm.. what do we return to the others?
*/
if (tcb->stat_loc)
{
*tcb->stat_loc = status << 8;
tcb->stat_loc = NULL;
}
/* Wake up the thread */
sem_post(&tcb->exitsem);
}
#endif
/* If an exit function was registered, call it now. */
#ifdef CONFIG_SCHED_ATEXIT
if (tcb->exitfunc)
{
(*tcb->exitfunc)();
}
#endif
/* Then "really" exit */
_exit(status);
}
