bits/sigaction.h

   1 /* Copyright (C) 1991,92,96,97,98,2001 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    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     union {
  34       __sighandler_t sa_handler;
  35       void (*sa_sigaction) (int, siginfo_t *, void *);
  36     } __sigaction_handler;
  37 # define sa_handler    __sigaction_handler.sa_handler
  38 # define sa_sigaction  __sigaction_handler.sa_sigaction
  39
  40     /* Additional set of signals to be blocked.  */
  41     __sigset_t sa_mask;
  42
  43     /* Special flags.  */
  44     int sa_flags;
  45   };
  46
  47 /* Bits in `sa_flags'.  */
  48 #if defined __USE_UNIX98 || defined __USE_MISC
  49 # define SA_ONSTACK     0x0001  /* Take signal on signal stack.  */
  50 # define SA_RESTART     0x0002  /* Restart syscall on signal return.  */
  51 # define SA_NODEFER     0x0010  /* Don't automatically block the signal when
  52                                     its handler is being executed.  */
  53 # define SA_RESETHAND   0x0004  /* Reset to SIG_DFL on entry to handler.  */
  54 #endif
  55 #define SA_NOCLDSTOP    0x0008  /* Don't send SIGCHLD when children stop.  */
  56
  57 #ifdef __USE_MISC
  58 # define SA_INTERRUPT   0       /* Historical no-op ("not SA_RESTART").  */
  59
  60 /* Some aliases for the SA_ constants.  */
  61 # define SA_NOMASK    SA_NODEFER
  62 # define SA_ONESHOT   SA_RESETHAND
  63 # define SA_STACK     SA_ONSTACK
  64 #endif
  65
  66
  67 /* Values for the HOW argument to `sigprocmask'.  */
  68 #define SIG_BLOCK       1       /* Block signals.  */
  69 #define SIG_UNBLOCK     2       /* Unblock signals.  */
  70 #define SIG_SETMASK     3       /* Set the set of blocked signals.  */