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1/* Definitions for 31 & 64 bit S/390 sigaction.
2 Copyright (C) 2001-2025 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#include <bits/wordsize.h>
27
28#if __WORDSIZE == 64
29/* Structure describing the action to be taken when a signal arrives. */
30struct sigaction
31 {
32 /* Signal handler. */
33#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
34 union
35 {
36 /* Used if SA_SIGINFO is not set. */
37 __sighandler_t sa_handler;
38 /* Used if SA_SIGINFO is set. */
39 void (*sa_sigaction) (int, siginfo_t *, void *);
40 }
41 __sigaction_handler;
42# define sa_handler __sigaction_handler.sa_handler
43# define sa_sigaction __sigaction_handler.sa_sigaction
44#else
45 __sighandler_t sa_handler;
46#endif
47
48 /* Special flags. */
49 int __glibc_reserved0;
50 int sa_flags;
51
52 /* Restore handler. */
53 void (*sa_restorer) (void);
54
55 /* Additional set of signals to be blocked. */
56 __sigset_t sa_mask;
57 };
58#else
59/* Structure describing the action to be taken when a signal arrives. */
60struct sigaction
61 {
62 /* Signal handler. */
63#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
64 union
65 {
66 /* Used if SA_SIGINFO is not set. */
67 __sighandler_t sa_handler;
68 /* Used if SA_SIGINFO is set. */
69 void (*sa_sigaction) (int, siginfo_t *, void *);
70 }
71 __sigaction_handler;
72# define sa_handler __sigaction_handler.sa_handler
73# define sa_sigaction __sigaction_handler.sa_sigaction
74#else
75 __sighandler_t sa_handler;
76#endif
77
78 /* Additional set of signals to be blocked. */
79 __sigset_t sa_mask;
80
81 /* Special flags. */
82 int sa_flags;
83
84 /* Restore handler. */
85 void (*sa_restorer) (void);
86 };
87#endif
88
89/* Bits in `sa_flags'. */
90#define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */
91#define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */
92#define SA_SIGINFO 4 /* Invoke signal-catching function with
93 three arguments instead of one. */
94#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
95# define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */
96#endif
97#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
98# define SA_RESTART 0x10000000 /* Restart syscall on signal return. */
99# define SA_NODEFER 0x40000000 /* Don't automatically block the signal when
100 its handler is being executed. */
101# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */
102#endif
103#ifdef __USE_MISC
104# define SA_INTERRUPT 0x20000000 /* Historical no-op. */
105
106/* Some aliases for the SA_ constants. */
107# define SA_NOMASK SA_NODEFER
108# define SA_ONESHOT SA_RESETHAND
109# define SA_STACK SA_ONSTACK
110#endif
111
112/* Values for the HOW argument to `sigprocmask'. */
113#define SIG_BLOCK 0 /* Block signals. */
114#define SIG_UNBLOCK 1 /* Unblock signals. */
115#define SIG_SETMASK 2 /* Set the set of blocked signals. */
116
117#endif