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

   1 /* The proper definitions for Linux/Alpha sigaction.
   2    Copyright (C) 1996-2019 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _BITS_SIGACTION_H
  20 #define _BITS_SIGACTION_H 1
  21
  22 #ifndef _SIGNAL_H
  23 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
  24 #endif
  25
  26 /* Structure describing the action to be taken when a signal arrives.  */
  27 struct sigaction
  28   {
  29     /* Signal handler.  */
  30 #if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
  31     union
  32       {
  33         /* Used if SA_SIGINFO is not set.  */
  34         __sighandler_t sa_handler;
  35         /* Used if SA_SIGINFO is set.  */
  36         void (*sa_sigaction) (int, siginfo_t *, void *);
  37       }
  38     __sigaction_handler;
  39 # define sa_handler     __sigaction_handler.sa_handler
  40 # define sa_sigaction   __sigaction_handler.sa_sigaction
  41 #else
  42     __sighandler_t sa_handler;
  43 #endif
  44
  45     /* Additional set of signals to be blocked.  */
  46     __sigset_t sa_mask;
  47
  48     /* Special flags.  */
  49     int sa_flags;
  50   };
  51
  52 /* Bits in `sa_flags'.  */
  53 #define SA_NOCLDSTOP  0x00000004 /* Don't send SIGCHLD when children stop.  */
  54 #define SA_NOCLDWAIT  0x00000020 /* Don't create zombie on child death.  */
  55 #define SA_SIGINFO    0x00000040 /* Invoke signal-catching function with
  56                                     three arguments instead of one.  */
  57 #if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
  58 # define SA_ONSTACK   0x00000001 /* Use signal stack by using `sa_restorer'. */
  59 #endif
  60 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
  61 # define SA_RESTART   0x00000002 /* Restart syscall on signal return.  */
  62 # define SA_NODEFER   0x00000008 /* Don't automatically block the signal
  63                                     when its handler is being executed.  */
  64 # define SA_RESETHAND 0x00000010 /* Reset to SIG_DFL on entry to handler.  */
  65 #endif
  66 #ifdef __USE_MISC
  67 # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
  68
  69 /* Some aliases for the SA_ constants.  */
  70 # define SA_NOMASK    SA_NODEFER
  71 # define SA_ONESHOT   SA_RESETHAND
  72 # define SA_STACK     SA_ONSTACK
  73 #endif
  74
  75 /* Values for the HOW argument to `sigprocmask'.  */
  76 #define SIG_BLOCK     1          /* Block signals.  */
  77 #define SIG_UNBLOCK   2          /* Unblock signals.  */
  78 #define SIG_SETMASK   3          /* Set the set of blocked signals.  */
  79
  80 #endif