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- /* The proper definitions for Linux's sigaction.
- Copyright (C) 1993-2016 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #ifndef _SIGNAL_H
- # error "Never include <bits/sigaction.h> directly; use <signal.h> instead."
- #endif
- /* Structure describing the action to be taken when a signal arrives. */
- struct sigaction
- {
- /* Signal handler. */
- #ifdef __USE_POSIX199309
- union
- {
- /* Used if SA_SIGINFO is not set. */
- __sighandler_t sa_handler;
- /* Used if SA_SIGINFO is set. */
- void (*sa_sigaction) (int, siginfo_t *, void *);
- }
- __sigaction_handler;
- # define sa_handler __sigaction_handler.sa_handler
- # define sa_sigaction __sigaction_handler.sa_sigaction
- #else
- __sighandler_t sa_handler;
- #endif
- /* Additional set of signals to be blocked. */
- __sigset_t sa_mask;
- /* Special flags. */
- int sa_flags;
- /* Restore handler. */
- void (*sa_restorer) (void);
- };
- /* Bits in `sa_flags'. */
- #define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */
- #define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */
- #define SA_SIGINFO 4 /* Invoke signal-catching function with
- three arguments instead of one. */
- #if defined __USE_UNIX98 || defined __USE_MISC
- # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */
- #endif
- #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
- # define SA_RESTART 0x10000000 /* Restart syscall on signal return. */
- # define SA_NODEFER 0x40000000 /* Don't automatically block the signal when
- its handler is being executed. */
- # define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */
- #endif
- #ifdef __USE_MISC
- # define SA_INTERRUPT 0x20000000 /* Historical no-op. */
- /* Some aliases for the SA_ constants. */
- # define SA_NOMASK SA_NODEFER
- # define SA_ONESHOT SA_RESETHAND
- # define SA_STACK SA_ONSTACK
- #endif
- /* Values for the HOW argument to `sigprocmask'. */
- #define SIG_BLOCK 0 /* Block signals. */
- #define SIG_UNBLOCK 1 /* Unblock signals. */
- #define SIG_SETMASK 2 /* Set the set of blocked signals. */
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