1  /* Set a thread's signal state.  Hurd on Mach version.
       2     Copyright (C) 2002-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library;  if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <pthread.h>
      20  #include <assert.h>
      21  #include <signal.h>
      22  #include <hurd/signal.h>
      23  #include <hurd/msg.h>
      24  
      25  #include <pt-internal.h>
      26  
      27  error_t
      28  __pthread_sigstate (struct __pthread *thread, int how,
      29  		    const sigset_t *set, sigset_t *oset, int clear_pending)
      30  {
      31    error_t err = 0;
      32    struct hurd_sigstate *ss;
      33    sigset_t old, new;
      34    sigset_t pending;
      35  
      36    if (set != NULL)
      37      new = *set;
      38  
      39    ss = _hurd_thread_sigstate (thread->kernel_thread);
      40    assert (ss);
      41  
      42    _hurd_sigstate_lock (ss);
      43  
      44    old = ss->blocked;
      45  
      46    if (set != NULL)
      47      {
      48        switch (how)
      49  	{
      50  	case SIG_BLOCK:
      51  	  ss->blocked |= new;
      52  	  break;
      53  
      54  	case SIG_SETMASK:
      55  	  ss->blocked = new;
      56  	  break;
      57  
      58  	case SIG_UNBLOCK:
      59  	  ss->blocked &= ~new;
      60  	  break;
      61  
      62  	default:
      63  	  err = EINVAL;
      64  	  break;
      65  	}
      66        ss->blocked &= ~_SIG_CANT_MASK;
      67      }
      68  
      69    if (!err && clear_pending)
      70      __sigemptyset (&ss->pending);
      71  
      72    pending = _hurd_sigstate_pending (ss) & ~ss->blocked;
      73    _hurd_sigstate_unlock (ss);
      74  
      75    if (!err && oset != NULL)
      76      *oset = old;
      77  
      78    if (!err && pending)
      79      /* Send a message to the signal thread so it
      80         will wake up and check for pending signals.  */
      81      __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
      82  
      83    return err;
      84  }