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

   1 /* The proper definitions for Linux/Alpha sigaction.
   2    Copyright (C) 1996, 1997, 1999 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 #ifndef _SIGNAL_H
  21 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
  22 #endif
  23
  24 /* Structure describing the action to be taken when a signal arrives.  */
  25 struct sigaction
  26   {
  27     /* Signal handler.  */
  28 #ifdef __USE_POSIX199309
  29     union
  30       {
  31         /* Used if SA_SIGINFO is not set.  */
  32         __sighandler_t sa_handler;
  33         /* Used if SA_SIGINFO is set.  */
  34         void (*sa_sigaction) (int, siginfo_t *, void *);
  35       }
  36     __sigaction_handler;
  37 # define sa_handler     __sigaction_handler.sa_handler
  38 # define sa_sigaction   __sigaction_handler.sa_sigaction
  39 #else
  40     __sighandler_t sa_handler;
  41 #endif
  42
  43     /* Additional set of signals to be blocked.  */
  44     __sigset_t sa_mask;
  45
  46     /* Special flags.  */
  47     unsigned int sa_flags;
  48   };
  49
  50 /* Bits in `sa_flags'.  */
  51 #define SA_NOCLDSTOP  0x00000004 /* Don't send SIGCHLD when children stop.  */
  52 #define SA_SIGINFO    0x00000040 /* Invoke signal-catching function with three
  53                                     arguments instead of one. */
  54 #ifdef __USE_MISC
  55 # define SA_ONSTACK   0x00000001 /* Use signal stack by using `sa_restorer'. */
  56 # define SA_RESTART   0x00000002 /* Restart syscall on signal return.  */
  57 # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
  58 # define SA_NOMASK    0x00000008 /* Don't automatically block the signal
  59                                     when its handler is being executed.  */
  60 # define SA_ONESHOT   0x00000010 /* Reset to SIG_DFL on entry to handler.  */
  61
  62 /* Some aliases for the SA_ constants.  */
  63 # define SA_NODEFER   SA_NOMASK
  64 # define SA_RESETHAND SA_ONESHOT
  65 # define SA_STACK     SA_ONSTACK
  66 #endif
  67
  68 /* Values for the HOW argument to `sigprocmask'.  */
  69 #define SIG_BLOCK     1          /* Block signals.  */
  70 #define SIG_UNBLOCK   2          /* Unblock signals.  */
  71 #define SIG_SETMASK   3          /* Set the set of blocked signals.  */