1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <signal.h>
      20  #include <hurd.h>
      21  #include <hurd/signal.h>
      22  #include <hurd/msg.h>
      23  
      24  /* If SET is not NULL, modify the current set of blocked signals
      25     according to HOW, which may be SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK.
      26     If OSET is not NULL, store the old set of blocked signals in *OSET.  */
      27  int
      28  __sigprocmask (int how, const sigset_t *set, sigset_t *oset)
      29  {
      30    struct hurd_sigstate *ss;
      31    sigset_t old, new;
      32    sigset_t pending;
      33  
      34    if (set != NULL)
      35      new = *set;
      36  
      37    ss = _hurd_self_sigstate ();
      38  
      39    _hurd_sigstate_lock (ss);
      40  
      41    old = ss->blocked;
      42  
      43    if (set != NULL)
      44      {
      45        switch (how)
      46  	{
      47  	case SIG_BLOCK:
      48  	  __sigorset (&ss->blocked, &ss->blocked, &new);
      49  	  break;
      50  
      51  	case SIG_UNBLOCK:
      52  	  ss->blocked &= ~new;
      53  	  break;
      54  
      55  	case SIG_SETMASK:
      56  	  ss->blocked = new;
      57  	  break;
      58  
      59  	default:
      60  	  _hurd_sigstate_unlock (ss);
      61  	  return __hurd_fail (EINVAL);
      62  	}
      63  
      64        ss->blocked &= ~_SIG_CANT_MASK;
      65      }
      66  
      67    pending = _hurd_sigstate_pending (ss) & ~ss->blocked;
      68  
      69    _hurd_sigstate_unlock (ss);
      70  
      71    if (oset != NULL)
      72      *oset = old;
      73  
      74    if (pending)
      75      /* Send a message to the signal thread so it
      76         will wake up and check for pending signals.  */
      77      __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
      78  
      79    return 0;
      80  }
      81  
      82  libc_hidden_def (__sigprocmask)
      83  weak_alias (__sigprocmask, sigprocmask)