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sigaction.h
/* The proper definitions for Linux's sigaction. Copyright (C) 1993-2018 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 _BITS_SIGACTION_H #define _BITS_SIGACTION_H 1 #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. */ #if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED 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_XOPEN_EXTENDED || defined __USE_MISC # define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */ #endif #if defined __USE_XOPEN_EXTENDED || 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. */ #endif
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