posix/src/pthreadsigmask.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Examine and/or change the calling thread's signal mask
0009  */
0010
0011 /*
0012  *  3.3.5 Examine and Change Blocked Signals, P1003.1b-1993, p. 73
0013  *
0014  *  NOTE: P1003.1c/D10, p. 37 adds pthread_sigmask().
0015  *
0016  *  COPYRIGHT (c) 1989-1999.
0017  *  On-Line Applications Research Corporation (OAR).
0018  *
0019  * Redistribution and use in source and binary forms, with or without
0020  * modification, are permitted provided that the following conditions
0021  * are met:
0022  * 1. Redistributions of source code must retain the above copyright
0023  *    notice, this list of conditions and the following disclaimer.
0024  * 2. Redistributions in binary form must reproduce the above copyright
0025  *    notice, this list of conditions and the following disclaimer in the
0026  *    documentation and/or other materials provided with the distribution.
0027  *
0028  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0029  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0030  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0031  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0032  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0033  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0034  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0035  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0036  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0037  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0038  * POSSIBILITY OF SUCH DAMAGE.
0039  */
0040
0041 #ifdef HAVE_CONFIG_H
0042 #include "config.h"
0043 #endif
0044
0045 #include <pthread.h>
0046 #include <signal.h>
0047 #include <errno.h>
0048
0049 #include <rtems/posix/pthreadimpl.h>
0050 #include <rtems/posix/psignalimpl.h>
0051 #include <rtems/seterr.h>
0052
0053 int pthread_sigmask(
0054   int               how,
0055   const sigset_t   *__restrict set,
0056   sigset_t         *__restrict oset
0057 )
0058 {
0059   POSIX_API_Control  *api;
0060
0061   if ( !set && !oset )
0062     rtems_set_errno_and_return_minus_one( EINVAL );
0063
0064   api = _Thread_Get_executing()->API_Extensions[ THREAD_API_POSIX ];
0065
0066   if ( oset )
0067     *oset = ~api->signals_unblocked;
0068
0069   if ( !set )
0070     return 0;
0071
0072   switch ( how ) {
0073     case SIG_BLOCK:
0074       api->signals_unblocked &= ~*set;
0075       break;
0076     case SIG_UNBLOCK:
0077       api->signals_unblocked |= *set;
0078       break;
0079     case SIG_SETMASK:
0080       api->signals_unblocked = ~*set;
0081       break;
0082     default:
0083       rtems_set_errno_and_return_minus_one( EINVAL );
0084   }
0085
0086   /* XXX are there critical section problems here? */
0087
0088   /* XXX evaluate the new set */
0089
0090   if ( api->signals_unblocked &
0091        (api->signals_pending | _POSIX_signals_Pending) ) {
0092     _Thread_Dispatch();
0093   }
0094
0095   return 0;
0096 }