sysdeps/mach/hurd/sigprocmask.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <signal.h>
  22 #include <hurd.h>
  23 #include <hurd/signal.h>
  24 #include <hurd/msg.h>
  25
  26
  27 /* If SET is not NULL, modify the current set of blocked signals
  28    according to HOW, which may be SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK.
  29    If OSET is not NULL, store the old set of blocked signals in *OSET.  */
  30 int
  31 DEFUN(__sigprocmask, (how, set, oset),
  32       int how AND CONST sigset_t *set AND sigset_t *oset)
  33 {
  34   struct hurd_sigstate *ss;
  35   sigset_t old, new;
  36   sigset_t pending;
  37
  38   if (set != NULL)
  39     new = *set;
  40
  41   ss = _hurd_self_sigstate ();
  42
  43   __spin_lock (&ss->lock);
  44
  45   old = ss->blocked;
  46
  47   if (set != NULL)
  48     {
  49       switch (how)
  50         {
  51         case SIG_BLOCK:
  52           ss->blocked |= new;
  53           break;
  54
  55         case SIG_UNBLOCK:
  56           ss->blocked &= ~new;
  57           break;
  58
  59         case SIG_SETMASK:
  60           ss->blocked = new;
  61           break;
  62
  63         default:
  64           __spin_unlock (&ss->lock);
  65           errno = EINVAL;
  66           return -1;
  67         }
  68
  69       ss->blocked &= ~_SIG_CANT_MASK;
  70     }
  71
  72   pending = ss->pending & ~ss->blocked;
  73
  74   __spin_unlock (&ss->lock);
  75
  76   if (oset != NULL)
  77     *oset = old;
  78
  79   if (pending)
  80     /* Send a message to the signal thread so it
  81        will wake up and check for pending signals.  */
  82     __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
  83
  84   return 0;
  85 }
  86
  87 weak_alias (__sigprocmask, sigprocmask)