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+/* Page fault handling library.
+   Copyright (C) 1998-1999, 2002, 2004-2008  Bruno Haible <bruno@clisp.org>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _SIGSEGV_H
+#define _SIGSEGV_H
+
+#include <windows.h>
+
+/* HAVE_SIGSEGV_RECOVERY
+   is defined if the system supports catching SIGSEGV.  */
+#if 1
+# define HAVE_SIGSEGV_RECOVERY 1
+#endif
+
+/* HAVE_STACK_OVERFLOW_RECOVERY
+   is defined if stack overflow can be caught.  */
+#if 1
+# define HAVE_STACK_OVERFLOW_RECOVERY 1
+#endif
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define LIBSIGSEGV_VERSION 0x0206    /* version number: (major<<8) + minor */
+extern int libsigsegv_version;       /* Likewise */
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * The type of a global SIGSEGV handler.
+ * The fault address is passed as argument.
+ * The access type (read access or write access) is not passed; your handler
+ * has to know itself how to distinguish these two cases.
+ * The second argument is 0, meaning it could also be a stack overflow, or 1,
+ * meaning the handler should seriously try to fix the fault.
+ * The return value should be nonzero if the handler has done its job
+ * and no other handler should be called, or 0 if the handler declines
+ * responsibility for the given address.
+ *
+ * The handler is run at a moment when nothing about the global state of the
+ * program is known. Therefore it cannot use facilities that manipulate global
+ * variables or locks. In particular, it cannot use malloc(); use mmap()
+ * instead. It cannot use fopen(); use open() instead. Etc. All global
+ * variables that are accessed by the handler should be marked 'volatile'.
+ */
+typedef int (*sigsegv_handler_t) (void* fault_address, int serious);
+
+/*
+ * Installs a global SIGSEGV handler.
+ * This should be called once only, and it ignores any previously installed
+ * SIGSEGV handler.
+ * Returns 0 on success, or -1 if the system doesn't support catching SIGSEGV.
+ */
+extern int sigsegv_install_handler (sigsegv_handler_t handler);
+
+/*
+ * Deinstalls the global SIGSEGV handler.
+ * This goes back to the state where no SIGSEGV handler is installed.
+ */
+extern void sigsegv_deinstall_handler (void);
+
+#if LIBSIGSEGV_VERSION >= 0x0206
+/*
+ * Prepares leaving a SIGSEGV handler (through longjmp or similar means).
+ * Control is transferred by calling CONTINUATION with CONT_ARG1, CONT_ARG2,
+ * CONT_ARG3 as arguments.
+ * CONTINUATION must not return.
+ * The sigsegv_leave_handler function may return if called from a SIGSEGV
+ * handler; its return value should be used as the handler's return value.
+ * The sigsegv_leave_handler function does not return if called from a
+ * stack overflow handler.
+ */
+extern int sigsegv_leave_handler (void (*continuation) (void*, void*, void*), void* cont_arg1, void* cont_arg2, void* cont_arg3);
+#else /* older versions of libsigsegv */
+/*
+ * Prepares leaving a SIGSEGV handler (through longjmp or similar means).
+ * Limitation: This function could only be called once on MacOS X.
+ */
+extern void sigsegv_leave_handler (void);
+#endif
+
+/*
+ * The type of a context passed to a stack overflow handler.
+ * This type is system dependent; on some platforms it is an 'ucontext_t *',
+ * on some platforms it is a 'struct sigcontext *', on others merely an
+ * opaque 'void *'.
+ */
+typedef CONTEXT *stackoverflow_context_t;
+
+/*
+ * The type of a stack overflow handler.
+ * Such a handler should perform a longjmp call in order to reduce the amount
+ * of stack needed. It must not return.
+ * The emergency argument is 0 when the stack could be repared, or 1 if the
+ * application should better save its state and exit now.
+ *
+ * The handler is run at a moment when nothing about the global state of the
+ * program is known. Therefore it cannot use facilities that manipulate global
+ * variables or locks. In particular, it cannot use malloc(); use mmap()
+ * instead. It cannot use fopen(); use open() instead. Etc. All global
+ * variables that are accessed by the handler should be marked 'volatile'.
+ */
+typedef void (*stackoverflow_handler_t) (int emergency, stackoverflow_context_t scp);
+
+/*
+ * Installs a stack overflow handler.
+ * The extra_stack argument is a pointer to a pre-allocated area used as a
+ * stack for executing the handler. It is typically allocated by use of
+ * `alloca' during `main'. Its size should be sufficiently large.
+ * The following code determines an appropriate size:
+ *   #include <signal.h>
+ *   #ifndef SIGSTKSZ         / * glibc defines SIGSTKSZ for this purpose * /
+ *   # define SIGSTKSZ 16384  / * on most platforms, 16 KB are sufficient * /
+ *   #endif
+ * Returns 0 on success, or -1 if the system doesn't support catching stack
+ * overflow.
+ */
+extern int stackoverflow_install_handler (stackoverflow_handler_t handler,
+                                          void* extra_stack, unsigned long extra_stack_size);
+
+/*
+ * Deinstalls the stack overflow handler.
+ */
+extern void stackoverflow_deinstall_handler (void);
+
+/* -------------------------------------------------------------------------- */
+
+/*
+ * The following structure and functions permit to define different SIGSEGV
+ * policies on different address ranges.
+ */
+
+/*
+ * The type of a local SIGSEGV handler.
+ * The fault address is passed as argument.
+ * The second argument is fixed arbitrary user data.
+ * The return value should be nonzero if the handler has done its job
+ * and no other handler should be called, or 0 if the handler declines
+ * responsibility for the given address.
+ */
+typedef int (*sigsegv_area_handler_t) (void* fault_address, void* user_arg);
+
+/*
+ * This structure represents a table of memory areas (address range intervals),
+ * with an local SIGSEGV handler for each.
+ */
+typedef
+struct sigsegv_dispatcher {
+  void* tree;
+}
+sigsegv_dispatcher;
+
+/*
+ * Initializes a sigsegv_dispatcher structure.
+ */
+extern void sigsegv_init (sigsegv_dispatcher* dispatcher);
+
+/*
+ * Adds a local SIGSEGV handler to a sigsegv_dispatcher structure.
+ * It will cover the interval [address..address+len-1].
+ * Returns a "ticket" that can be used to remove the handler later.
+ */
+extern void* sigsegv_register (sigsegv_dispatcher* dispatcher,
+                               void* address, unsigned long len,
+                               sigsegv_area_handler_t handler, void* handler_arg);
+
+/*
+ * Removes a local SIGSEGV handler.
+ */
+extern void sigsegv_unregister (sigsegv_dispatcher* dispatcher, void* ticket);
+
+/*
+ * Call the local SIGSEGV handler responsible for the given fault address.
+ * Return the handler's return value. 0 means that no handler has been found,
+ * or that a handler was found but declined responsibility.
+ */
+extern int sigsegv_dispatch (sigsegv_dispatcher* dispatcher, void* fault_address);
+
+/* -------------------------------------------------------------------------- */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SIGSEGV_H */