.\"

.\" CDDL HEADER START

.\"

.\" The contents of this file are subject to the terms of the

.\" Common Development and Distribution License (the "License").

.\" You may not use this file except in compliance with the License.

.\"

.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

.\" or http://www.opensolaris.org/os/licensing.

.\" See the License for the specific language governing permissions

.\" and limitations under the License.

.\"

.\" When distributing Covered Code, include this CDDL HEADER in each

.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.

.\" If applicable, add the following below this CDDL HEADER, with the

.\" fields enclosed by brackets "[]" replaced with your own identifying

.\" information: Portions Copyright [yyyy] [name of copyright owner]

.\"

.\" CDDL HEADER END

.\"

.\" Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.

.\"

.\"

.TH SIGSEGV 3 "13 Jan 2009" "SunOS 5.11"

.SH NAME

sigsegv  \-  Handling page faults in user mode

.sp

.SH SYNOPSIS

.sp

#include <\fBsigsegv.h\fR>

.sp

.SH DESCRIPTION

.sp

.LP

Sigsegv is a set of functions for handling page faults in user mode. Multithreading is used to improve the performance of a program.A page fault occurs when a program tries to access to a region of memory that is currently not available. Catching and handling a page fault is a useful technique for implementing:

.RS +4

.TP

.ie t \(bu

.el o

pageable virtual memory

.RE

.RS +4

.TP

.ie t \(bu

.el o

memory-mapped access to persistent databases

.RE

.RS +4

.TP

.ie t \(bu

.el o

generational garbage collectors

.RE

.RS +4

.TP

.ie t \(bu

.el o

stack overflow handlers

.RE

.RS +4

.TP

.ie t \(bu

.el o

distributed shared memory

.RE

.RS +4

.TP

.ie t \(bu

.el o

 ...

.RE

.sp

.LP  

The sigsegv functions are summarized in this section in the following

groups:

.sp

.RS +4

.TP

.ie t \(bu

.el o  

Global SIGSEGV handlers

.RE

.RS +4

.TP

.ie t \(bu

.el o

Local SIGSEGV handlers (a handler per memory area)

.RE

.RS +4

.TP

.ie t \(bu

.el o

Stack overflow handlers

.RE

.sp

.LP

The <sigsegv.h> header defines the following symbols:

.sp

.RS +4

.TP

.ie t \(bu

.el o

HAVE_SIGSEGV_RECOVERY

.RE

.RS +4

.TP

.ie t \(bu

.el o

HAVE_STACK_OVERFLOW_RECOVERY

.RE

.RS +4

.TP

.ie t \(bu

.el o

LIBSIGSEGV_VERSION

.RE

.sp

.LP

The types listed below are defined as described in <sigsegv.h>:

.RS +4

.TP

.ie t \(bu

.el o

sigsegv_handler_t

.RE

.RS +4

.TP

.ie t \(bu

.el o

sigsegv_handler_t

.RE

.RS +4

.TP

.ie t \(bu

.el o

stackoverflow_context_t

.RE

.RS +4

.TP

.ie t \(bu

.el o

sigsegv_area_handler_t

.RE

.sp

.SH GLOBAL SIGSEGV HANDLERS

.sp

int \fBsigsegv_install_handler\fR (sigsegv_handler_t handler);

.sp

void \fBsigsegv_deinstall_handler\fR (void);

.sp

.SH LOCAL SIGSEGV HANDLERS

.sp

void \fBsigsegv_init\fR (sigsegv_dispatcher* dispatcher);

.sp

void* \fBsigsegv_register\fR (sigsegv_dispatcher* dispatcher,

.RS +24

void* address, unsigned long len, 

sigsegv_area_handler_t handler,

void* handler_arg);

.RE

.sp

void \fBsigsegv_unregister\fR (sigsegv_dispatcher* dispatcher, 

.RS +25

void* ticket);

.RE

.sp

int \fBsigsegv_dispatch\fR (sigsegv_dispatcher* dispatcher, 

.RS +22

void* fault_address);

.RE

.sp

.SH STACK OVERFLOW HANDLERS

.sp

int \fBstackoverflow_install_handler\fR (stackoverflow_handler_t

.RS +27

handler, void* extra_stack,

unsigned long extra_stack_size);

.RE

.sp

void \fBstackoverflow_deinstall_handler\fR (void);

.sp

.SH SEE ALSO

.sp

.LP

\fBattributes\fR(5), \fBsigsegv\fR(3), \fBstandards\fR(5), \fBsigsegv_install_handler, \fBsigsegv_deinstall_handler\fR(3), \fBsigsegv_init\fR(3), \fBsigsegv_register\fR(3), \fBsigsegv_unregister\fR(3), \fBsigsegv_dispatch\fR(3), \fBstackoverflow_install_handler\fR(3), \fBstackoverflow_deinstall_handler\fR(3)