win32/include/signal.h

   1 /*
   2  * signal.h
   3  *
   4  * A way to set handlers for exceptional conditions (also known as signals).
   5  *
   6  * This file is part of the Mingw32 package.
   7  *
   8  * Contributors:
   9  *  Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
  10  *
  11  *  THIS SOFTWARE IS NOT COPYRIGHTED
  12  *
  13  *  This source code is offered for use in the public domain. You may
  14  *  use, modify or distribute it freely.
  15  *
  16  *  This code is distributed in the hope that it will be useful but
  17  *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  18  *  DISCLAIMED. This includes but is not limited to warranties of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * $Revision: 1.2 $
  22  * $Author: bellard $
  23  * $Date: 2005/04/17 13:14:29 $
  24  *
  25  */
  26
  27 #ifndef _SIGNAL_H_
  28 #define _SIGNAL_H_
  29
  30 /* All the headers include this file. */
  31 #include <_mingw.h>
  32
  33 /*
  34  * The actual signal values. Using other values with signal
  35  * produces a SIG_ERR return value.
  36  *
  37  * NOTE: SIGINT is produced when the user presses Ctrl-C.
  38  *       SIGILL has not been tested.
  39  *       SIGFPE doesn't seem to work?
  40  *       SIGSEGV does not catch writing to a NULL pointer (that shuts down
  41  *               your app; can you say "segmentation violation core dump"?).
  42  *       SIGTERM comes from what kind of termination request exactly?
  43  *       SIGBREAK is indeed produced by pressing Ctrl-Break.
  44  *       SIGABRT is produced by calling abort.
  45  * TODO: The above results may be related to not installing an appropriate
  46  *       structured exception handling frame. Results may be better if I ever
  47  *       manage to get the SEH stuff down.
  48  */
  49 #define SIGINT          2       /* Interactive attention */
  50 #define SIGILL          4       /* Illegal instruction */
  51 #define SIGFPE          8       /* Floating point error */
  52 #define SIGSEGV         11      /* Segmentation violation */
  53 #define SIGTERM         15      /* Termination request */
  54 #define SIGBREAK        21      /* Control-break */
  55 #define SIGABRT         22      /* Abnormal termination (abort) */
  56
  57 #define NSIG 23     /* maximum signal number + 1 */
  58
  59 #ifndef RC_INVOKED
  60
  61 #ifndef _SIG_ATOMIC_T_DEFINED
  62 typedef int sig_atomic_t;
  63 #define _SIG_ATOMIC_T_DEFINED
  64 #endif
  65
  66 /*
  67  * The prototypes (below) are the easy part. The hard part is figuring
  68  * out what signals are available and what numbers they are assigned
  69  * along with appropriate values of SIG_DFL and SIG_IGN.
  70  */
  71
  72 /*
  73  * A pointer to a signal handler function. A signal handler takes a
  74  * single int, which is the signal it handles.
  75  */
  76 typedef void (*__p_sig_fn_t)(int);
  77
  78 /*
  79  * These are special values of signal handler pointers which are
  80  * used to send a signal to the default handler (SIG_DFL), ignore
  81  * the signal (SIG_IGN), or indicate an error return (SIG_ERR).
  82  */
  83 #define SIG_DFL ((__p_sig_fn_t) 0)
  84 #define SIG_IGN ((__p_sig_fn_t) 1)
  85 #define SIG_ERR ((__p_sig_fn_t) -1)
  86
  87 #ifdef  __cplusplus
  88 extern "C" {
  89 #endif
  90
  91 /*
  92  * Call signal to set the signal handler for signal sig to the
  93  * function pointed to by handler. Returns a pointer to the
  94  * previous handler, or SIG_ERR if an error occurs. Initially
  95  * unhandled signals defined above will return SIG_DFL.
  96  */
  97 __p_sig_fn_t    signal(int, __p_sig_fn_t);
  98
  99 /*
 100  * Raise the signal indicated by sig. Returns non-zero on success.
 101  */
 102 int     raise (int);
 103
 104 #ifdef  __cplusplus
 105 }
 106 #endif
 107
 108 #endif  /* Not RC_INVOKED */
 109
 110 #endif  /* Not _SIGNAL_H_ */
 111