sysdeps/mach/hurd/sigprocmask.c

   1 /* Copyright (C) 1991-2017 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    <http://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   __spin_lock (&ss->lock);
  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           __spin_unlock (&ss->lock);
  61           errno = EINVAL;
  62           return -1;
  63         }
  64
  65       ss->blocked &= ~_SIG_CANT_MASK;
  66     }
  67
  68   pending = ss->pending & ~ss->blocked;
  69
  70   __spin_unlock (&ss->lock);
  71
  72   if (oset != NULL)
  73     *oset = old;
  74
  75   if (pending)
  76     /* Send a message to the signal thread so it
  77        will wake up and check for pending signals.  */
  78     __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
  79
  80   return 0;
  81 }
  82
  83 weak_alias (__sigprocmask, sigprocmask)