aboutsummaryrefslogtreecommitdiff
path: root/arch/all/core/include/signal.h
blob: 7849f30dcd992bd78f21bdb06094284604f63bca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
/* ****************************************************************************
 * 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