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.\" ========================================================================
.\"
.IX Title "POE::Driver::SysRW 3pm"
.TH POE::Driver::SysRW 3pm "2020-02-07" "perl v5.30.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
POE::Driver::SysRW \- buffered, non\-blocking I/O using sysread and syswrite
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\*(L"\s-1SYNOPSIS\*(R"\s0 in POE::Driver illustrates how the interface works.  This
module is merely one implementation.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This driver implements POE::Driver using sysread and syswrite.
.SH "PUBLIC METHODS"
.IX Header "PUBLIC METHODS"
POE::Driver::SysRW introduces some additional features not covered in
the base interface.
.SS "new [BlockSize => \s-1OCTETS\s0]"
.IX Subsection "new [BlockSize => OCTETS]"
\&\fBnew()\fR creates a new buffered I/O driver that uses \fBsysread()\fR to read
data from a handle and \fBsyswrite()\fR to flush data to that handle.  The
constructor accepts one optional named parameter, \f(CW\*(C`BlockSize\*(C'\fR, which
indicates the maximum number of \s-1OCTETS\s0 that will be read at one time.
.PP
\&\f(CW\*(C`BlockSize\*(C'\fR is 64 kilobytes (65536 octets) by default.  Higher values
may improve performance in streaming applications, but the trade-off
is a lower event granularity and increased resident memory usage.
.PP
Lower \f(CW\*(C`BlockSize\*(C'\fR values reduce memory consumption somewhat with
corresponding throughput penalties.
.PP
.Vb 1
\&  my $driver = POE::Driver::SysRW\->new;
\&
\&  my $driver = POE::Driver::SysRW\->new( BlockSize => $block_size );
.Ve
.PP
Drivers are commonly instantiated within POE::Wheel constructor calls:
.PP
.Vb 6
\&  $_[HEAP]{wheel} = POE::Wheel::ReadWrite\->new(
\&    InputHandle => \e*STDIN,
\&    OutputHandle => \e*STDOUT,
\&    Driver => POE::Driver::SysRW\->new(),
\&    Filter => POE::Filter::Line\->new(),
\&  );
.Ve
.PP
Applications almost always use POE::Driver::SysRW, so POE::Wheel
objects almost always will create their own if no Driver is specified.
.SS "All Other Methods"
.IX Subsection "All Other Methods"
POE::Driver::SysRW documents the abstract interface documented in
POE::Driver.  Please see POE::Driver for more details about the
following methods:
.IP "flush" 4
.IX Item "flush"
.PD 0
.IP "get" 4
.IX Item "get"
.IP "get_out_messages_buffered" 4
.IX Item "get_out_messages_buffered"
.IP "put" 4
.IX Item "put"
.PD
.SH "SEE ALSO"
.IX Header "SEE ALSO"
POE::Driver, POE::Wheel.
.PP
Also see the \s-1SEE ALSO\s0 section of \s-1POE\s0, which contains a brief
roadmap of \s-1POE\s0's documentation.
.SH "AUTHORS & COPYRIGHTS"
.IX Header "AUTHORS & COPYRIGHTS"
Please see \s-1POE\s0 for more information about authors and contributors.