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1 | /* The proper definitions for Linux/Alpha sigaction. |
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2 | Copyright (C) 1996-2022 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 | |
52 | /* Bits in `sa_flags'. */ |
53 | #define SA_NOCLDSTOP 0x00000004 /* Don't send SIGCHLD when children stop. */ |
54 | #define SA_NOCLDWAIT 0x00000020 /* Don't create zombie on child death. */ |
55 | #define SA_SIGINFO 0x00000040 /* Invoke signal-catching function with |
56 | three arguments instead of one. */ |
57 | #if defined __USE_XOPEN_EXTENDED || defined __USE_MISC |
58 | # define SA_ONSTACK 0x00000001 /* Use signal stack by using `sa_restorer'. */ |
59 | #endif |
60 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
61 | # define SA_RESTART 0x00000002 /* Restart syscall on signal return. */ |
62 | # define SA_NODEFER 0x00000008 /* Don't automatically block the signal |
63 | when its handler is being executed. */ |
64 | # define SA_RESETHAND 0x00000010 /* 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 1 /* Block signals. */ |
77 | #define SIG_UNBLOCK 2 /* Unblock signals. */ |
78 | #define SIG_SETMASK 3 /* Set the set of blocked signals. */ |
79 | |
80 | #endif |
81 |
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