1/* The proper definitions for Linux's sigaction.
2   Copyright (C) 1993-1999, 2000 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.  */
25struct 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    int sa_flags;
48
49    /* Restore handler.  */
50    void (*sa_restorer) (void);
51  };
52
53/* Bits in `sa_flags'.  */
54#define	SA_NOCLDSTOP  1		 /* Don't send SIGCHLD when children stop.  */
55#define SA_NOCLDWAIT  2		 /* Don't create zombie on child death.  */
56#define SA_SIGINFO    4		 /* Invoke signal-catching function with
57				    three arguments instead of one.  */
58#if defined __USE_UNIX98 || defined __USE_MISC
59# define SA_ONSTACK   0x08000000 /* Use signal stack by using `sa_restorer'. */
60# define SA_RESTART   0x10000000 /* Restart syscall on signal return.  */
61# define SA_NODEFER   0x40000000 /* Don't automatically block the signal when
62				    its handler is being executed.  */
63# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler.  */
64#endif
65#ifdef __USE_MISC
66# define SA_INTERRUPT 0x20000000 /* Historical no-op.  */
67
68/* Some aliases for the SA_ constants.  */
69# define SA_NOMASK    SA_NODEFER
70# define SA_ONESHOT   SA_RESETHAND
71# define SA_STACK     SA_ONSTACK
72#endif
73
74/* Values for the HOW argument to `sigprocmask'.  */
75#define	SIG_BLOCK     0		 /* Block signals.  */
76#define	SIG_UNBLOCK   1		 /* Unblock signals.  */
77#define	SIG_SETMASK   2		 /* Set the set of blocked signals.  */
78