/* 

 * signal.h

 * This file has no copyright assigned and is placed in the Public Domain.

 * This file is a part of the mingw-runtime package.

 * No warranty is given; refer to the file DISCLAIMER within the package.

 *

 * A way to set handlers for exceptional conditions (also known as signals).

 *

 */

#ifndef	_SIGNAL_H_

#define	_SIGNAL_H_

/* All the headers include this file. */

#include <_mingw.h>

/*

 * The actual signal values. Using other values with signal

 * produces a SIG_ERR return value.

 *

 * NOTE: SIGINT is produced when the user presses Ctrl-C.

 *       SIGILL has not been tested.

 *       SIGFPE doesn't seem to work?

 *       SIGSEGV does not catch writing to a NULL pointer (that shuts down

 *               your app; can you say "segmentation violation core dump"?).

 *       SIGTERM comes from what kind of termination request exactly?

 *       SIGBREAK is indeed produced by pressing Ctrl-Break.

 *       SIGABRT is produced by calling abort.

 * TODO: The above results may be related to not installing an appropriate

 *       structured exception handling frame. Results may be better if I ever

 *       manage to get the SEH stuff down.

 */

#define	SIGINT		2	/* Interactive attention */

#define	SIGILL		4	/* Illegal instruction */

#define	SIGFPE		8	/* Floating point error */

#define	SIGSEGV		11	/* Segmentation violation */

#define	SIGTERM		15	/* Termination request */

#define SIGBREAK	21	/* Control-break */

#define	SIGABRT		22	/* Abnormal termination (abort) */

#define NSIG 23     /* maximum signal number + 1 */

#ifndef	RC_INVOKED

#ifndef _SIG_ATOMIC_T_DEFINED

typedef int sig_atomic_t;

#define _SIG_ATOMIC_T_DEFINED

#endif

/*

 * The prototypes (below) are the easy part. The hard part is figuring

 * out what signals are available and what numbers they are assigned

 * along with appropriate values of SIG_DFL and SIG_IGN.

 */

/*

 * A pointer to a signal handler function. A signal handler takes a

 * single int, which is the signal it handles.

 */

typedef	void (*__p_sig_fn_t)(int);

/*

 * These are special values of signal handler pointers which are

 * used to send a signal to the default handler (SIG_DFL), ignore

 * the signal (SIG_IGN), indicate an error return (SIG_ERR),

 * get an error (SIG_SGE), or acknowledge (SIG_ACK).

 */

#define	SIG_DFL	((__p_sig_fn_t) 0)

#define	SIG_IGN	((__p_sig_fn_t) 1)

#define	SIG_ERR ((__p_sig_fn_t) -1)

#define SIG_SGE ((__p_sig_fn_t) 3)

#define SIG_ACK ((__p_sig_fn_t) 4)

#ifdef	__cplusplus

extern "C" {

#endif

/*

 * Call signal to set the signal handler for signal sig to the

 * function pointed to by handler. Returns a pointer to the

 * previous handler, or SIG_ERR if an error occurs. Initially

 * unhandled signals defined above will return SIG_DFL.

 */

_CRTIMP __p_sig_fn_t __cdecl __MINGW_NOTHROW	signal(int, __p_sig_fn_t);

/*

 * Raise the signal indicated by sig. Returns non-zero on success.

 */

_CRTIMP int __cdecl __MINGW_NOTHROW	raise (int);

#ifdef	__cplusplus

}

#endif

#endif	/* Not RC_INVOKED */

#endif	/* Not _SIGNAL_H_ */