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/* ****************************************************************************
* signal.h -- Signals.
*
* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
*
* This file is part of the 'all/core' module in libcarrot, an experimental
* modular libc project.
*
* This file 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 3 of the License, or (at your option)
* any later version.
*
* This file 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 Lesser Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this file. If not, see <http://www.gnu.org/licenses/>.
* ************************************************************************* */
#include <cdefs.h>
__BEGIN_NAMESPACE_STD
/* ************************************************************************* */
/* Types and macros */
/* ************************************************************************* */
/* `sig_atomic_t` is the standard type describing an integer that can be
* accessed as an atomic entity, even in the presence of asynchronous
* interrupts. */
typedef volatile int sig_atomic_t;
/* `__sighandler_t` is the type of a signal callback.
* To the functions taking a pointer, instead of sending a real function,
* you can send one of the `SIG_*` macros to make special actions. */
typedef void __sighandler_t _OF((int __sig));
/* `SIG_ERR`: produce an error;
* `SIG_DFL`: do the default action for the signal;
* `SIG_IGN`: ignore the signal. */
#define SIG_ERR ((__sighandler_t*)-1)
#define SIG_DFL ((__sighandler_t*) 0)
#define SIG_IGN ((__sighandler_t*) 1)
/* Here are the different signals you can interact with:
* `SIGABRT`: abnormal termination (e.g. caused by `abort`);
* `SIGFPE`: erroneous arithmetic operation (e.g. zero divide);
* `SIGILL`: illegal instruction;
* `SIGINT`: interrupt;
* `SIGSEGV`: invalid access to storage;
* `SIGTERM`: program termination request. */
#define SIGABRT 1
#define SIGFPE 2
#define SIGILL 3
#define SIGINT 4
#define SIGSEGV 5
#define SIGTERM 6
/* ************************************************************************* */
/* Main functions */
/* ************************************************************************* */
__BEGIN_DECLS
/* Register a signal handler. */
extern __sighandler_t signal _OF((int __sig,
__sighandler_t *__handler)) __THROW;
/* Raise a signal. */
extern int raise _OF((int __sig)) __THROW;
__END_DECLS
__END_NAMESPACE_STD
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