1/* The proper definitions for Linux's sigaction.
2 Copyright (C) 1993-2018 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. */
27struct 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 /* Restore handler. */
52 void (*sa_restorer) (void);
53 };
54
55/* Bits in `sa_flags'. */
56#define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */
57#define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */
58#define SA_SIGINFO 4 /* Invoke signal-catching function with
59 three arguments instead of one. */
60#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
61# define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */
62#endif
63#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
64# define SA_RESTART 0x10000000 /* Restart syscall on signal return. */
65# define SA_NODEFER 0x40000000 /* Don't automatically block the signal when
66 its handler is being executed. */
67# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */
68#endif
69#ifdef __USE_MISC
70# define SA_INTERRUPT 0x20000000 /* Historical no-op. */
71
72/* Some aliases for the SA_ constants. */
73# define SA_NOMASK SA_NODEFER
74# define SA_ONESHOT SA_RESETHAND
75# define SA_STACK SA_ONSTACK
76#endif
77
78/* Values for the HOW argument to `sigprocmask'. */
79#define SIG_BLOCK 0 /* Block signals. */
80#define SIG_UNBLOCK 1 /* Unblock signals. */
81#define SIG_SETMASK 2 /* Set the set of blocked signals. */
82
83#endif
84