posix/src/psignalclearsignals.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIX_SIGNALS POSIX Signals Support
0007  *
0008  * @brief POSIX Signals Clear Signals
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2007.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <errno.h>
0042 #include <pthread.h>
0043 #include <signal.h>
0044
0045 #include <rtems/score/isr.h>
0046 #include <rtems/score/thread.h>
0047 #include <rtems/posix/threadsup.h>
0048 #include <rtems/posix/psignalimpl.h>
0049 #include <rtems/posix/pthreadimpl.h>
0050 #include <stdio.h>
0051
0052 /*
0053  *  _POSIX_signals_Clear_signals
0054  */
0055
0056 bool _POSIX_signals_Clear_signals(
0057   POSIX_API_Control  *api,
0058   int                 signo,
0059   siginfo_t          *info,
0060   bool                is_global,
0061   bool                check_blocked,
0062   bool                do_signals_acquire_release
0063 )
0064 {
0065   sigset_t                    mask;
0066   sigset_t                    signals_unblocked;
0067   Thread_queue_Context        queue_context;
0068   bool                        do_callout;
0069   POSIX_signals_Siginfo_node *psiginfo;
0070
0071   mask = signo_to_mask( signo );
0072
0073   do_callout = false;
0074
0075   /* set blocked signals based on if checking for them, SIGNAL_ALL_MASK
0076    * insures that no signals are blocked and all are checked.
0077    */
0078
0079   if ( check_blocked )
0080     signals_unblocked = api->signals_unblocked;
0081   else
0082     signals_unblocked = SIGNAL_ALL_MASK;
0083
0084   /* XXX is this right for siginfo type signals? */
0085   /* XXX are we sure they can be cleared the same way? */
0086
0087   if ( do_signals_acquire_release ) {
0088     _Thread_queue_Context_initialize( &queue_context );
0089     _POSIX_signals_Acquire( &queue_context );
0090   }
0091
0092     if ( is_global ) {
0093        if ( mask & (_POSIX_signals_Pending & signals_unblocked) ) {
0094          if ( _POSIX_signals_Vectors[ signo ].sa_flags == SA_SIGINFO ) {
0095            psiginfo = (POSIX_signals_Siginfo_node *)
0096              _Chain_Get_unprotected( &_POSIX_signals_Siginfo[ signo ] );
0097            _POSIX_signals_Clear_process_signals( signo );
0098            /*
0099             *  It may be impossible to get here with an empty chain
0100             *  BUT until that is proven we need to be defensive and
0101             *  protect against it.
0102             */
0103            if ( psiginfo ) {
0104              *info = psiginfo->Info;
0105              _Chain_Append_unprotected(
0106                &_POSIX_signals_Inactive_siginfo,
0107                &psiginfo->Node
0108              );
0109            } else
0110              do_callout = false;
0111          }
0112          _POSIX_signals_Clear_process_signals( signo );
0113          do_callout = true;
0114        }
0115     } else {
0116       if ( mask & (api->signals_pending & signals_unblocked) ) {
0117         api->signals_pending &= ~mask;
0118         do_callout = true;
0119       }
0120     }
0121
0122   if ( do_signals_acquire_release ) {
0123     _POSIX_signals_Release( &queue_context );
0124   }
0125
0126   return do_callout;
0127 }