bits/sigaction.h

   1 /* Copyright (C) 1991, 1992, 1996, 1997 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _SIGNAL_H
  20 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
  21 #endif
  22
  23 /* These definitions match those used by the 4.4 BSD kernel.
  24    If the operating system has a `sigaction' system call that correctly
  25    implements the POSIX.1 behavior, there should be a system-dependent
  26    version of this file that defines `struct sigaction' and the `SA_*'
  27    constants appropriately.  */
  28
  29 /* Structure describing the action to be taken when a signal arrives.  */
  30 struct sigaction
  31   {
  32     /* Signal handler.  */
  33     __sighandler_t sa_handler;
  34
  35     /* Additional set of signals to be blocked.  */
  36     __sigset_t sa_mask;
  37
  38     /* Special flags.  */
  39     int sa_flags;
  40   };
  41
  42 /* Bits in `sa_flags'.  */
  43 #ifdef  __USE_BSD
  44 # define SA_ONSTACK     0x1     /* Take signal on signal stack.  */
  45 # define SA_RESTART     0x2     /* Restart syscall on signal return.  */
  46 # define SA_DISABLE     0x4     /* Disable alternate signal stack.  */
  47 #endif
  48 #define SA_NOCLDSTOP    0x8     /* Don't send SIGCHLD when children stop.  */
  49
  50
  51 /* Values for the HOW argument to `sigprocmask'.  */
  52 #define SIG_BLOCK       1       /* Block signals.  */
  53 #define SIG_UNBLOCK     2       /* Unblock signals.  */
  54 #define SIG_SETMASK     3       /* Set the set of blocked signals.  */