import winsup-2000-02-17 snapshot

winsup/mingw/include/signal.h

@@ -0,0 +1,111 @@
+/* 
+ * signal.h
+ *
+ * A way to set handlers for exceptional conditions (also known as signals).
+ *
+ * This file is part of the Mingw32 package.
+ *
+ * Contributors:
+ *  Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
+ *
+ *  THIS SOFTWARE IS NOT COPYRIGHTED
+ *
+ *  This source code is offered for use in the public domain. You may
+ *  use, modify or distribute it freely.
+ *
+ *  This code is distributed in the hope that it will be useful but
+ *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
+ *  DISCLAMED. This includes but is not limited to warranties of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * $Revision$
+ * $Author$
+ * $Date$
+ *
+ */
+
+#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), or indicate an error return (SIG_ERR).
+ */
+#define	SIG_DFL	((__p_sig_fn_t) 0)
+#define	SIG_IGN	((__p_sig_fn_t) 1)
+#define	SIG_ERR ((__p_sig_fn_t) -1)
+
+#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.
+ */
+__p_sig_fn_t	signal(int, __p_sig_fn_t);
+
+/*
+ * Raise the signal indicated by sig. Returns non-zero on success.
+ */
+int	raise (int);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* Not RC_INVOKED */
+
+#endif	/* Not _SIGNAL_H_ */
+