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/**
* @file
*
* @brief Replacing signal mask with *sigmask and suspending calling process
* @ingroup POSIXAPI
*/
/*
* 3.3.7 Wait for a Signal, P1003.1b-1993, p. 75
*
* COPYRIGHT (c) 1989-2004.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stddef.h>
#include <assert.h>
#include <signal.h>
#include <errno.h>
#include <rtems/seterr.h>
int sigsuspend(
const sigset_t *sigmask
)
{
sigset_t saved_signals_blocked;
sigset_t current_unblocked_signals;
#if defined(RTEMS_DEBUG)
int status;
#endif
/*
* We use SIG_BLOCK and not SIG_SETMASK because there may be
* signals which might be pending, which might get caught here.
* We want the signals to be caught inside sigtimedwait.
*
* We ignore the return status codes because sigsuspend() is
* defined to either terminate or return -1 with errno set to
* EINTR.
*/
#if defined(RTEMS_DEBUG)
status =
#else
(void)
#endif
sigprocmask( SIG_BLOCK, sigmask, &saved_signals_blocked );
current_unblocked_signals = ~(*sigmask);
#if defined(RTEMS_DEBUG)
status =
#else
(void)
#endif
sigtimedwait( ¤t_unblocked_signals, NULL, NULL );
(void) sigprocmask( SIG_SETMASK, &saved_signals_blocked, NULL );
/*
* sigtimedwait() returns the signal number while sigsuspend()
* is supposed to return -1 and EINTR when a signal is caught.
*/
#if defined(RTEMS_DEBUG)
assert( status != -1 );
#endif
rtems_set_errno_and_return_minus_one( EINTR );
}
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