text: /**
   * @file signal.h
   * Copyright 2012, 2013 MinGW.org project
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   * 
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   * 
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  #ifndef	_SIGNAL_H
  #define	_SIGNAL_H
  #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 signal(int, __p_sig_fn_t);
  
  /*
   * Raise the signal indicated by sig. Returns non-zero on success.
   */
  _CRTIMP int __cdecl raise (int);
  
  #ifdef	__cplusplus
  }
  #endif
  
  #endif	/* Not RC_INVOKED */
  
  #endif	/* Not _SIGNAL_H */
  