mingw/include/signal.h

   1 /*
   2  * signal.h
   3  * This file has no copyright assigned and is placed in the Public Domain.
   4  * This file is a part of the mingw-runtime package.
   5  * No warranty is given; refer to the file DISCLAIMER within the package.
   6  *
   7  * A way to set handlers for exceptional conditions (also known as signals).
   8  *
   9  */
  10
  11 #ifndef _SIGNAL_H_
  12 #define _SIGNAL_H_
  13
  14 /* All the headers include this file. */
  15 #include <_mingw.h>
  16
  17 /*
  18  * The actual signal values. Using other values with signal
  19  * produces a SIG_ERR return value.
  20  *
  21  * NOTE: SIGINT is produced when the user presses Ctrl-C.
  22  *       SIGILL has not been tested.
  23  *       SIGFPE doesn't seem to work?
  24  *       SIGSEGV does not catch writing to a NULL pointer (that shuts down
  25  *               your app; can you say "segmentation violation core dump"?).
  26  *       SIGTERM comes from what kind of termination request exactly?
  27  *       SIGBREAK is indeed produced by pressing Ctrl-Break.
  28  *       SIGABRT is produced by calling abort.
  29  * TODO: The above results may be related to not installing an appropriate
  30  *       structured exception handling frame. Results may be better if I ever
  31  *       manage to get the SEH stuff down.
  32  */
  33 #define SIGINT          2       /* Interactive attention */
  34 #define SIGILL          4       /* Illegal instruction */
  35 #define SIGFPE          8       /* Floating point error */
  36 #define SIGSEGV         11      /* Segmentation violation */
  37 #define SIGTERM         15      /* Termination request */
  38 #define SIGBREAK        21      /* Control-break */
  39 #define SIGABRT         22      /* Abnormal termination (abort) */
  40
  41 #define NSIG 23     /* maximum signal number + 1 */
  42
  43 #ifndef RC_INVOKED
  44
  45 #ifndef _SIG_ATOMIC_T_DEFINED
  46 typedef int sig_atomic_t;
  47 #define _SIG_ATOMIC_T_DEFINED
  48 #endif
  49
  50 /*
  51  * The prototypes (below) are the easy part. The hard part is figuring
  52  * out what signals are available and what numbers they are assigned
  53  * along with appropriate values of SIG_DFL and SIG_IGN.
  54  */
  55
  56 /*
  57  * A pointer to a signal handler function. A signal handler takes a
  58  * single int, which is the signal it handles.
  59  */
  60 typedef void (*__p_sig_fn_t)(int);
  61
  62 /*
  63  * These are special values of signal handler pointers which are
  64  * used to send a signal to the default handler (SIG_DFL), ignore
  65  * the signal (SIG_IGN), indicate an error return (SIG_ERR),
  66  * get an error (SIG_SGE), or acknowledge (SIG_ACK).
  67  */
  68 #define SIG_DFL ((__p_sig_fn_t) 0)
  69 #define SIG_IGN ((__p_sig_fn_t) 1)
  70 #define SIG_ERR ((__p_sig_fn_t) -1)
  71 #define SIG_SGE ((__p_sig_fn_t) 3)
  72 #define SIG_ACK ((__p_sig_fn_t) 4)
  73
  74 #ifdef  __cplusplus
  75 extern "C" {
  76 #endif
  77
  78 /*
  79  * Call signal to set the signal handler for signal sig to the
  80  * function pointed to by handler. Returns a pointer to the
  81  * previous handler, or SIG_ERR if an error occurs. Initially
  82  * unhandled signals defined above will return SIG_DFL.
  83  */
  84 _CRTIMP __p_sig_fn_t __cdecl    signal(int, __p_sig_fn_t);
  85
  86 /*
  87  * Raise the signal indicated by sig. Returns non-zero on success.
  88  */
  89 _CRTIMP int __cdecl     raise (int);
  90
  91 #ifdef  __cplusplus
  92 }
  93 #endif
  94
  95 #endif  /* Not RC_INVOKED */
  96
  97 #endif  /* Not _SIGNAL_H_ */
  98