sysdeps/unix/sysv/linux/alpha/bits/sigaction.h

   1 /* The proper definitions for Linux/Alpha sigaction.
   2    Copyright (C) 1996, 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 /* Structure describing the action to be taken when a signal arrives.  */
  21 struct sigaction
  22   {
  23     /* Signal handler.  */
  24     __sighandler_t sa_handler;
  25
  26     /* Additional set of signals to be blocked.  */
  27     __sigset_t sa_mask;
  28
  29     /* Special flags.  */
  30     unsigned int sa_flags;
  31   };
  32
  33 /* Bits in `sa_flags'.  */
  34 #define SA_NOCLDSTOP  0x00000004 /* Don't send SIGCHLD when children stop.  */
  35 #ifdef __USE_MISC
  36 # define SA_STACK     0x00000001 /* Use signal stack by using `sa_restorer'. */
  37 # define SA_RESTART   0x00000002 /* Restart syscall on signal return.  */
  38 # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
  39 # define SA_NOMASK    0x00000008 /* Don't automatically block the signal
  40                                     when its handler is being executed.  */
  41 # define SA_ONESHOT   0x00000010 /* Reset to SIG_DFL on entry to handler.  */
  42
  43 /* Some aliases for the SA_ constants.  */
  44 # define SA_NODEFER   SA_NOMASK
  45 # define SA_RESETHAND SA_ONESHOT
  46 #endif
  47
  48 /* Values for the HOW argument to `sigprocmask'.  */
  49 #define SIG_BLOCK     1          /* Block signals.  */
  50 #define SIG_UNBLOCK   2          /* Unblock signals.  */
  51 #define SIG_SETMASK   3          /* Set the set of blocked signals.  */