1 /* The proper definitions for Linux's sigaction.
2 Copyright (C) 1993-2015 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 _SIGNAL_H
20 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
21 #endif
22
23 /* Structure describing the action to be taken when a signal arrives. */
24 struct sigaction
25 {
26 /* Signal handler. */
27 #ifdef __USE_POSIX199309
28 union
29 {
30 /* Used if SA_SIGINFO is not set. */
31 __sighandler_t sa_handler;
32 /* Used if SA_SIGINFO is set. */
33 void (*sa_sigaction) (int, siginfo_t *, void *);
34 }
35 __sigaction_handler;
36 # define sa_handler __sigaction_handler.sa_handler
37 # define sa_sigaction __sigaction_handler.sa_sigaction
38 #else
39 __sighandler_t sa_handler;
40 #endif
41
42 /* Additional set of signals to be blocked. */
43 __sigset_t sa_mask;
44
45 /* Special flags. */
46 int sa_flags;
47
48 /* Restore handler. */
49 void (*sa_restorer) (void);
50 };
51
52 /* Bits in `sa_flags'. */
53 #define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */
54 #define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */
55 #define SA_SIGINFO 4 /* Invoke signal-catching function with
56 three arguments instead of one. */
57 #if defined __USE_UNIX98 || defined __USE_MISC
58 # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */
59 #endif
60 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
61 # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */
62 # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when
63 its handler is being executed. */
64 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */
65 #endif
66 #ifdef __USE_MISC
67 # define SA_INTERRUPT 0x20000000 /* Historical no-op. */
68
69 /* Some aliases for the SA_ constants. */
70 # define SA_NOMASK SA_NODEFER
71 # define SA_ONESHOT SA_RESETHAND
72 # define SA_STACK SA_ONSTACK
73 #endif
74
75 /* Values for the HOW argument to `sigprocmask'. */
76 #define SIG_BLOCK 0 /* Block signals. */
77 #define SIG_UNBLOCK 1 /* Unblock signals. */
78 #define SIG_SETMASK 2 /* Set the set of blocked signals. */
79