'\" te

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.\"

.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 ATTRIBUTES

See

.BR attributes(5)

for descriptions of the  following  attributes:

.sp

.TS

tab() box;

cw(2.75i) |cw(2.75i) 

lw(2.75i) |lw(2.75i) 

.

ATTRIBUTE TYPEATTRIBUTE VALUE

_

_

Interface StabilityUncommitted

_

StandardSee \fBstandards\fR(5).

.TE

.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)

.SH NOTES

The libsigsegv project is located at http://libsigsegv.sourceforge.net.

.sp

Source for libsigsegv is available on http://opensolaris.org.