| 1 | /* The proper definitions for Linux's sigaction. |
|---|---|
| 2 | Copyright (C) 1993-2016 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 |