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Editing File: /usr/include/bits/signum-generic.h

/* Signal number constants.  Generic template.
   Copyright (C) 1991-2018 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_SIGNUM_GENERIC_H
#define _BITS_SIGNUM_GENERIC_H 1

#ifndef _SIGNAL_H
#error "Never include <bits/signum-generic.h> directly; use <signal.h> instead."
#endif

/* Fake signal functions.  */

#define	SIG_ERR	 ((__sighandler_t) -1)	/* Error return.  */
#define	SIG_DFL	 ((__sighandler_t)  0)	/* Default action.  */
#define	SIG_IGN	 ((__sighandler_t)  1)	/* Ignore signal.  */

#ifdef __USE_XOPEN
# define SIG_HOLD ((__sighandler_t) 2)	/* Add signal to hold mask.  */
#endif

/* We define here all the signal names listed in POSIX (1003.1-2008);
   as of 1003.1-2013, no additional signals have been added by POSIX.
   We also define here signal names that historically exist in every
   real-world POSIX variant (e.g. SIGWINCH).

Signals in the 1-15 range are defined with their historical numbers.
   For other signals, we use the BSD numbers.
   There are two unallocated signal numbers in the 1-31 range: 7 and 29.
   Signal number 0 is reserved for use as kill(pid, 0), to test whether
   a process exists without sending it a signal.  */

/* ISO C99 signals.  */
#define	SIGINT		2	/* Interactive attention signal.  */
#define	SIGILL		4	/* Illegal instruction.  */
#define	SIGABRT		6	/* Abnormal termination.  */
#define	SIGFPE		8	/* Erroneous arithmetic operation.  */
#define	SIGSEGV		11	/* Invalid access to storage.  */
#define	SIGTERM		15	/* Termination request.  */

/* Historical signals specified by POSIX. */
#define	SIGHUP		1	/* Hangup.  */
#define	SIGQUIT		3	/* Quit.  */
#define	SIGTRAP		5	/* Trace/breakpoint trap.  */
#define	SIGKILL		9	/* Killed.  */
#define SIGBUS		10	/* Bus error.  */
#define	SIGSYS		12	/* Bad system call.  */
#define	SIGPIPE		13	/* Broken pipe.  */
#define	SIGALRM		14	/* Alarm clock.  */

/* New(er) POSIX signals (1003.1-2008, 1003.1-2013).  */
#define	SIGURG		16	/* Urgent data is available at a socket.  */
#define	SIGSTOP		17	/* Stop, unblockable.  */
#define	SIGTSTP		18	/* Keyboard stop.  */
#define	SIGCONT		19	/* Continue.  */
#define	SIGCHLD		20	/* Child terminated or stopped.  */
#define	SIGTTIN		21	/* Background read from control terminal.  */
#define	SIGTTOU		22	/* Background write to control terminal.  */
#define	SIGPOLL		23	/* Pollable event occurred (System V).  */
#define	SIGXCPU		24	/* CPU time limit exceeded.  */
#define	SIGXFSZ		25	/* File size limit exceeded.  */
#define	SIGVTALRM	26	/* Virtual timer expired.  */
#define	SIGPROF		27	/* Profiling timer expired.  */
#define	SIGUSR1		30	/* User-defined signal 1.  */
#define	SIGUSR2		31	/* User-defined signal 2.  */

/* Nonstandard signals found in all modern POSIX systems
   (including both BSD and Linux).  */
#define	SIGWINCH	28	/* Window size change (4.3 BSD, Sun).  */

/* Archaic names for compatibility.  */
#define	SIGIO		SIGPOLL	/* I/O now possible (4.2 BSD).  */
#define	SIGIOT		SIGABRT	/* IOT instruction, abort() on a PDP-11.  */
#define	SIGCLD		SIGCHLD	/* Old System V name */

/* Not all systems support real-time signals.  bits/signum.h indicates
   that they are supported by overriding __SIGRTMAX to a value greater
   than __SIGRTMIN.  These constants give the kernel-level hard limits,
   but some real-time signals may be used internally by glibc.  Do not
   use these constants in application code; use SIGRTMIN and SIGRTMAX
   (defined in signal.h) instead.  */
#define __SIGRTMIN	32
#define __SIGRTMAX	__SIGRTMIN

/* Biggest signal number + 1 (including real-time signals).  */
#define _NSIG		(__SIGRTMAX + 1)

#endif /* bits/signum-generic.h.  */

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