.
[glibc/history.git] / bits / sigaction.h
blobadcc276cc883e57942934311667a498b062b575e
1 /* Copyright (C) 1991,92,96,97,98,2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #ifndef _SIGNAL_H
20 # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
21 #endif
23 /* These definitions match those used by the 4.4 BSD kernel.
24 If the operating system has a `sigaction' system call that correctly
25 implements the POSIX.1 behavior, there should be a system-dependent
26 version of this file that defines `struct sigaction' and the `SA_*'
27 constants appropriately. */
29 /* Structure describing the action to be taken when a signal arrives. */
30 struct sigaction
32 /* Signal handler. */
33 #ifdef __USE_POSIX199309
34 union
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 *);
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
48 /* Additional set of signals to be blocked. */
49 __sigset_t sa_mask;
51 /* Special flags. */
52 int sa_flags;
55 /* Bits in `sa_flags'. */
56 #if defined __USE_UNIX98 || defined __USE_MISC
57 # define SA_ONSTACK 0x0001 /* Take signal on signal stack. */
58 # define SA_RESTART 0x0002 /* Restart syscall on signal return. */
59 # define SA_NODEFER 0x0010 /* Don't automatically block the signal when
60 its handler is being executed. */
61 # define SA_RESETHAND 0x0004 /* Reset to SIG_DFL on entry to handler. */
62 #endif
63 #define SA_NOCLDSTOP 0x0008 /* Don't send SIGCHLD when children stop. */
65 #ifdef __USE_MISC
66 # define SA_INTERRUPT 0 /* Historical no-op ("not SA_RESTART"). */
68 /* Some aliases for the SA_ constants. */
69 # define SA_NOMASK SA_NODEFER
70 # define SA_ONESHOT SA_RESETHAND
71 # define SA_STACK SA_ONSTACK
72 #endif
75 /* Values for the HOW argument to `sigprocmask'. */
76 #define SIG_BLOCK 1 /* Block signals. */
77 #define SIG_UNBLOCK 2 /* Unblock signals. */
78 #define SIG_SETMASK 3 /* Set the set of blocked signals. */