1 /* The proper definitions for Linux's sigaction.
2 Copyright (C) 1993-1999, 2000, 2010 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
19
20 #ifndef _SIGNAL_H
21 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
22 #endif
23
24 /* Structure describing the action to be taken when a signal arrives. */
25 struct sigaction
26 {
27 /* Signal handler. */
28 #ifdef __USE_POSIX199309
29 union
30 {
31 /* Used if SA_SIGINFO is not set. */
32 __sighandler_t sa_handler;
33 /* Used if SA_SIGINFO is set. */
34 void (*sa_sigaction) (int, siginfo_t *, void *);
35 }
36 __sigaction_handler;
37 # define sa_handler __sigaction_handler.sa_handler
38 # define sa_sigaction __sigaction_handler.sa_sigaction
39 #else
40 __sighandler_t sa_handler;
41 #endif
42
43 /* Additional set of signals to be blocked. */
44 __sigset_t sa_mask;
45
46 /* Special flags. */
47 int sa_flags;
48
49 /* Restore handler. */
50 void (*sa_restorer) (void);
51 };
52
53 /* Bits in `sa_flags'. */
54 #define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */
55 #define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */
56 #define SA_SIGINFO 4 /* Invoke signal-catching function with
57 three arguments instead of one. */
58 #if defined __USE_UNIX98 || defined __USE_MISC
59 # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */
60 #endif
61 #if defined __USE_UNIX98 || defined __USE_MISC || defined __USE_XOPEN2K8
62 # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */
63 # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when
64 its handler is being executed. */
65 # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */
66 #endif
67 #ifdef __USE_MISC
68 # define SA_INTERRUPT 0x20000000 /* Historical no-op. */
69
70 /* Some aliases for the SA_ constants. */
71 # define SA_NOMASK SA_NODEFER
72 # define SA_ONESHOT SA_RESETHAND
73 # define SA_STACK SA_ONSTACK
74 #endif
75
76 /* Values for the HOW argument to `sigprocmask'. */
77 #define SIG_BLOCK 0 /* Block signals. */
78 #define SIG_UNBLOCK 1 /* Unblock signals. */
79 #define SIG_SETMASK 2 /* Set the set of blocked signals. */
80