1/* The proper definitions for Linux's sigaction. 
2 Copyright (C) 1993-2022 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 <https://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