sysdeps/unix/sysv/linux/sigaction.h

   1 /* The proper definitions for Linux's sigaction.
   2    Copyright (C) 1993, 1994, 1995, 1996 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     int sa_flags;
  31
  32     /* Restore handler.  */
  33     void (*sa_restorer) __P ((void));
  34   };
  35
  36 /* Bits in `sa_flags'.  */
  37 #define SA_NOCLDSTOP 1          /* Don't send SIGCHLD when children stop.  */
  38 #ifdef __USE_MISC
  39 #define SA_STACK     0x08000000 /* Use signal stack by using `sa_restorer'.  */
  40 #define SA_RESTART   0x10000000 /* Don't restart syscall on signal return.  */
  41 #define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
  42 #define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
  43                                    its handler is being executed.  */
  44 #define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
  45
  46 /* Some aliases for the SA_ constants.  */
  47 #define SA_NOMASK       SA_NODEFER
  48 #define SA_ONESHOT      SA_RESETHAND
  49 #endif
  50
  51 /* Values for the HOW argument to `sigprocmask'.  */
  52 #define SIG_BLOCK       0       /* Block signals.  */
  53 #define SIG_UNBLOCK     1       /* Unblock signals.  */
  54 #define SIG_SETMASK     2       /* Set the set of blocked signals.  */