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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 governed by the CeCILL-C license under French law and abiding
 * by the rules of distribution of free software. You can use, modify and or
 * redistribute it under the terms of the CeCILL-C license as circulated by
 * CEA, CNRS and INRIA at the following URL: http://www.cecill.info
 *
 * As a counterpart to the access to the source code and rights to copy, modify
 * and redistribute granted by the license, users are provided only with a
 * limited warranty and the software's author, the holder of the economic
 * rights, and the successive licensors have only limited liability.
 *
 * In this respect, the user's attention is drawn to the risks associated with
 * loading, using, modifying and/or developing and reproducing the software by
 * the user in light of its specific status of free software, that may mean
 * that it is complicated to manipulate, and that also therefore means that it
 * is reserved for developers and experienced professionals having in-depth
 * computer knowledge. Users are therefore encouraged to load and test the
 * software's suitability as regards their requirements in conditions enabling
 * the security of their systems and/or data to be ensured and, more generally,
 * to use and operate it in the same conditions as regards security.
 *
 * The fact that you are presently reading this means you have had knowledge of
 * the CeCILL-C license and that you accept its terms.
 * ************************************************************************* */
#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