1/* Signal number constants.  Generic template.
 2   Copyright (C) 1991-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 5   The GNU C Library is free software; you can redistribute it and/or
 6   modify it under the terms of the GNU Lesser General Public
 7   License as published by the Free Software Foundation; either
 8   version 2.1 of the License, or (at your option) any later version.
 9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#ifndef	_BITS_SIGNUM_GENERIC_H
20#define _BITS_SIGNUM_GENERIC_H 1
21
22#ifndef _SIGNAL_H
23#error "Never include <bits/signum-generic.h> directly; use <signal.h> instead."
24#endif
25
26/* Fake signal functions.  */
27
28#define	SIG_ERR	 ((__sighandler_t) -1)	/* Error return.  */
29#define	SIG_DFL	 ((__sighandler_t)  0)	/* Default action.  */
30#define	SIG_IGN	 ((__sighandler_t)  1)	/* Ignore signal.  */
31
32#ifdef __USE_XOPEN
33# define SIG_HOLD ((__sighandler_t) 2)	/* Add signal to hold mask.  */
34#endif
35
36/* We define here all the signal names listed in POSIX (1003.1-2008);
37   as of 1003.1-2013, no additional signals have been added by POSIX.
38   We also define here signal names that historically exist in every
39   real-world POSIX variant (e.g. SIGWINCH).
40
41   Signals in the 1-15 range are defined with their historical numbers.
42   For other signals, we use the BSD numbers.
43   There are two unallocated signal numbers in the 1-31 range: 7 and 29.
44   Signal number 0 is reserved for use as kill(pid, 0), to test whether
45   a process exists without sending it a signal.  */
46
47/* ISO C99 signals.  */
48#define	SIGINT		2	/* Interactive attention signal.  */
49#define	SIGILL		4	/* Illegal instruction.  */
50#define	SIGABRT		6	/* Abnormal termination.  */
51#define	SIGFPE		8	/* Erroneous arithmetic operation.  */
52#define	SIGSEGV		11	/* Invalid access to storage.  */
53#define	SIGTERM		15	/* Termination request.  */
54
55/* Historical signals specified by POSIX. */
56#define	SIGHUP		1	/* Hangup.  */
57#define	SIGQUIT		3	/* Quit.  */
58#define	SIGTRAP		5	/* Trace/breakpoint trap.  */
59#define	SIGKILL		9	/* Killed.  */
60#define	SIGPIPE		13	/* Broken pipe.  */
61#define	SIGALRM		14	/* Alarm clock.  */
62
63/* Archaic names for compatibility.  */
64#define	SIGIO		SIGPOLL	/* I/O now possible (4.2 BSD).  */
65#define	SIGIOT		SIGABRT	/* IOT instruction, abort() on a PDP-11.  */
66#define	SIGCLD		SIGCHLD	/* Old System V name */
67
68/* Not all systems support real-time signals.  bits/signum.h indicates
69   that they are supported by overriding __SIGRTMAX to a value greater
70   than __SIGRTMIN.  These constants give the kernel-level hard limits,
71   but some real-time signals may be used internally by glibc.  Do not
72   use these constants in application code; use SIGRTMIN and SIGRTMAX
73   (defined in signal.h) instead.  */
74
75/* Include system specific bits.  */
76#include <bits/signum-arch.h>
77
78/* Biggest signal number + 1 (including real-time signals).  */
79#define _NSIG		(__SIGRTMAX + 1)
80
81#endif /* bits/signum-generic.h.  */