sysdeps/mach/hurd/htl/pt-sigstate.c

   1 /* Set a thread's signal state.  Hurd on Mach version.
   2    Copyright (C) 2002-2020 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 pending;
  34
  35   ss = _hurd_thread_sigstate (thread->kernel_thread);
  36   assert (ss);
  37
  38   _hurd_sigstate_lock (ss);
  39
  40   if (oset != NULL)
  41     *oset = ss->blocked;
  42
  43   if (set != NULL)
  44     {
  45       switch (how)
  46         {
  47         case SIG_BLOCK:
  48           ss->blocked |= *set;
  49           break;
  50
  51         case SIG_SETMASK:
  52           ss->blocked = *set;
  53           break;
  54
  55         case SIG_UNBLOCK:
  56           ss->blocked &= ~*set;
  57           break;
  58
  59         default:
  60           err = EINVAL;
  61           break;
  62         }
  63       ss->blocked &= ~_SIG_CANT_MASK;
  64     }
  65
  66   if (!err && clear_pending)
  67     __sigemptyset (&ss->pending);
  68
  69   pending = _hurd_sigstate_pending (ss) & ~ss->blocked;
  70   _hurd_sigstate_unlock (ss);
  71
  72   if (!err && pending)
  73     /* Send a message to the signal thread so it
  74        will wake up and check for pending signals.  */
  75     __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
  76
  77   return err;
  78 }