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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 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)