sysdeps/unix/sysv/sysv4/bits/sigaction.h

   1 /* The proper definitions for SVR4's sigaction.
   2    Copyright (C) 1993, 1994, 1996, 1997 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    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     /* Special flags.  */
  28     int sa_flags;
  29
  30     /* Signal handler.  */
  31     __sighandler_t sa_handler;
  32
  33     /* Additional set of signals to be blocked.  */
  34     __sigset_t sa_mask;
  35
  36     /* Padding.  */
  37     int sa_resv[2];
  38   };
  39
  40 /* Bits in `sa_flags'.  */
  41 #ifdef __USE_MISC
  42 # define SA_ONSTACK     0x1     /* Take signal on signal stack.  */
  43 # define SA_RESETHAND   0x2     /* Reset to SIG_DFL on entry to handler.  */
  44 # define SA_RESTART     0x4     /* Restart syscall on signal return.  */
  45 # define SA_SIGINFO     0x8     /* Provide additional info to the handler.  */
  46 # define SA_NODEFER     0x10    /* Don't automatically block the signal when
  47                                    its handler is being executed.  */
  48 # define SA_NOCLDWAIT   0x10000 /* Don't save zombie processes.  */
  49 #endif
  50 #define SA_NOCLDSTOP    0x20000 /* Don't send SIGCHLD when children stop.  */
  51
  52 /* Values for the HOW argument to `sigprocmask'.  */
  53 #define SIG_BLOCK       1       /* Block signals.  */
  54 #define SIG_UNBLOCK     2       /* Unblock signals.  */
  55 #define SIG_SETMASK     3       /* Set the set of blocked signals.  */