sysdeps/mach/hurd/sigprocmask.c

   1 /* Copyright (C) 1991-2015 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 (how, set, oset)
  29      int how;
  30      const sigset_t *set;
  31      sigset_t *oset;
  32 {
  33   struct hurd_sigstate *ss;
  34   sigset_t old, new;
  35   sigset_t pending;
  36
  37   if (set != NULL)
  38     new = *set;
  39
  40   ss = _hurd_self_sigstate ();
  41
  42   __spin_lock (&ss->lock);
  43
  44   old = ss->blocked;
  45
  46   if (set != NULL)
  47     {
  48       switch (how)
  49         {
  50         case SIG_BLOCK:
  51           __sigorset (&ss->blocked, &ss->blocked, &new);
  52           break;
  53
  54         case SIG_UNBLOCK:
  55           ss->blocked &= ~new;
  56           break;
  57
  58         case SIG_SETMASK:
  59           ss->blocked = new;
  60           break;
  61
  62         default:
  63           __spin_unlock (&ss->lock);
  64           errno = EINVAL;
  65           return -1;
  66         }
  67
  68       ss->blocked &= ~_SIG_CANT_MASK;
  69     }
  70
  71   pending = ss->pending & ~ss->blocked;
  72
  73   __spin_unlock (&ss->lock);
  74
  75   if (oset != NULL)
  76     *oset = old;
  77
  78   if (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 0;
  84 }
  85
  86 weak_alias (__sigprocmask, sigprocmask)