| 1 | /* The proper definitions for Linux's sigaction. |
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| 2 | Copyright (C) 1993-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _BITS_SIGACTION_H |
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| 20 | #define _BITS_SIGACTION_H 1 |
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| 21 | |
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| 22 | #ifndef _SIGNAL_H |
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| 23 | # error "Never include <bits/sigaction.h> directly; use <signal.h> instead." |
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| 24 | #endif |
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| 25 | |
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| 26 | /* Structure describing the action to be taken when a signal arrives. */ |
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| 27 | struct sigaction |
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| 28 | { |
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| 29 | /* Signal handler. */ |
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| 30 | #if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED |
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| 31 | union |
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| 32 | { |
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| 33 | /* Used if SA_SIGINFO is not set. */ |
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| 34 | __sighandler_t sa_handler; |
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| 35 | /* Used if SA_SIGINFO is set. */ |
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| 36 | void (*sa_sigaction) (int, siginfo_t *, void *); |
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| 37 | } |
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| 38 | __sigaction_handler; |
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| 39 | # define sa_handler __sigaction_handler.sa_handler |
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| 40 | # define sa_sigaction __sigaction_handler.sa_sigaction |
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| 41 | #else |
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| 42 | __sighandler_t sa_handler; |
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| 43 | #endif |
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| 44 | |
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| 45 | /* Additional set of signals to be blocked. */ |
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| 46 | __sigset_t sa_mask; |
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| 47 | |
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| 48 | /* Special flags. */ |
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| 49 | int sa_flags; |
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| 50 | |
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| 51 | /* Restore handler. */ |
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| 52 | void (*sa_restorer) (void); |
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| 53 | }; |
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| 54 | |
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| 55 | /* Bits in `sa_flags'. */ |
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| 56 | #define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */ |
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| 57 | #define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */ |
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| 58 | #define SA_SIGINFO 4 /* Invoke signal-catching function with |
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| 59 | three arguments instead of one. */ |
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| 60 | #if defined __USE_XOPEN_EXTENDED || defined __USE_MISC |
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| 61 | # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */ |
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| 62 | #endif |
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| 63 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
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| 64 | # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */ |
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| 65 | # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when |
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| 66 | its handler is being executed. */ |
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| 67 | # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */ |
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| 68 | #endif |
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| 69 | #ifdef __USE_MISC |
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| 70 | # define SA_INTERRUPT 0x20000000 /* Historical no-op. */ |
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| 71 | |
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| 72 | /* Some aliases for the SA_ constants. */ |
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| 73 | # define SA_NOMASK SA_NODEFER |
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| 74 | # define SA_ONESHOT SA_RESETHAND |
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| 75 | # define SA_STACK SA_ONSTACK |
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| 76 | #endif |
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| 77 | |
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| 78 | /* Values for the HOW argument to `sigprocmask'. */ |
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| 79 | #define SIG_BLOCK 0 /* Block signals. */ |
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| 80 | #define SIG_UNBLOCK 1 /* Unblock signals. */ |
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| 81 | #define SIG_SETMASK 2 /* Set the set of blocked signals. */ |
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| 82 | |
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| 83 | #endif |
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| 84 | |
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