sysdeps/generic/sigaction.h

   1 /* Copyright (C) 1991, 1992 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, 1992 Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /* These definitions match those used by the 4.4 BSD kernel.
  20    If the operating system has a `sigaction' system call that correctly
  21    implements the POSIX.1 behavior, there should be a system-dependent
  22    version of this file that defines `struct sigaction' and the `SA_*'
  23    constants appropriately.  */
  24
  25 /* Structure describing the action to be taken when a signal arrives.  */
  26 struct sigaction
  27   {
  28     /* Signal handler.  */
  29     __sighandler_t sa_handler;
  30
  31     /* Additional set of signals to be blocked.  */
  32     __sigset_t sa_mask;
  33
  34     /* Special flags.  */
  35     int sa_flags;
  36   };
  37
  38 /* Bits in `sa_flags'.  */
  39 #ifdef  __USE_BSD
  40 #define SA_ONSTACK      0x1     /* Take signal on signal stack.  */
  41 #define SA_RESTART      0x2     /* Don't restart syscall on signal return.  */
  42 #define SA_DISABLE      0x4     /* Disable alternate signal stack.  */
  43 #endif
  44 #define SA_NOCLDSTOP    0x8     /* Don't send SIGCHLD when children stop.  */
  45
  46
  47 /* Values for the HOW argument to `sigprocmask'.  */
  48 #define SIG_BLOCK       1       /* Block signals.  */
  49 #define SIG_UNBLOCK     2       /* Unblock signals.  */
  50 #define SIG_SETMASK     3       /* Set the set of blocked signals.  */