glibc (2.38)
1 /* The proper definitions for Linux's sigaction.
2 Copyright (C) 1993-2023 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. */
27 struct 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
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