text: /* The proper definitions for Linux/Alpha sigaction.
     Copyright (C) 1996, 1997, 1999, 2000, 2010 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, write to the Free
     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     02111-1307 USA.  */
  
  #ifndef _SIGNAL_H
  # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
  #endif
  
  /* Structure describing the action to be taken when a signal arrives.  */
  struct sigaction
    {
      /* Signal handler.  */
  #ifdef __USE_POSIX199309
      union
        {
  	/* Used if SA_SIGINFO is not set.  */
  	__sighandler_t sa_handler;
  	/* Used if SA_SIGINFO is set.  */
  	void (*sa_sigaction) (int, siginfo_t *, void *);
        }
      __sigaction_handler;
  # define sa_handler	__sigaction_handler.sa_handler
  # define sa_sigaction	__sigaction_handler.sa_sigaction
  #else
      __sighandler_t sa_handler;
  #endif
  
      /* Additional set of signals to be blocked.  */
      __sigset_t sa_mask;
  
      /* Special flags.  */
      unsigned int sa_flags;
    };
  
  /* Bits in `sa_flags'.  */
  #define	SA_NOCLDSTOP  0x00000004 /* Don't send SIGCHLD when children stop.  */
  #define SA_NOCLDWAIT  0x00000020 /* Don't create zombie on child death.  */
  #define SA_SIGINFO    0x00000040 /* Invoke signal-catching function with
  				    three arguments instead of one.  */
  #if defined __USE_UNIX98 || defined __USE_MISC
  # define SA_ONSTACK   0x00000001 /* Use signal stack by using `sa_restorer'. */
  #endif
  #if defined __USE_UNIX98 || defined __USE_MISC || defined __USE_XOPEN2K8
  # define SA_RESTART   0x00000002 /* Restart syscall on signal return.  */
  # define SA_NODEFER   0x00000008 /* Don't automatically block the signal
  				    when its handler is being executed.  */
  # define SA_RESETHAND 0x00000010 /* Reset to SIG_DFL on entry to handler.  */
  #endif
  #ifdef __USE_MISC
  # define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
  
  /* Some aliases for the SA_ constants.  */
  # define SA_NOMASK    SA_NODEFER
  # define SA_ONESHOT   SA_RESETHAND
  # define SA_STACK     SA_ONSTACK
  #endif
  
  /* Values for the HOW argument to `sigprocmask'.  */
  #define	SIG_BLOCK     1		 /* Block signals.  */
  #define	SIG_UNBLOCK   2		 /* Unblock signals.  */
  #define	SIG_SETMASK   3		 /* Set the set of blocked signals.  */
  