Sys::Sendfile - Zero-copy data transfer
use Sys::Sendfile; sendfile $sink, $source, $count;
Sys::Sendfile provides access to your operating system's
sendfile facility. It allows you to efficiently transfer data from one filehandle to another. Typically the source is a file on disk and the sink is a socket, and some operating systems may not even support other usage.
This function sends up to
$count bytes starting from
$out. If $count isn't given, it will try send all remaining bytes in $in, but on some operating systems sending only part of the bytes is a possible result. If
$offset isn't given, the function will get current offset of
$in (by calling lseek) and pass this information to underlying sendfile syscall.
$out can be a bareword, constant, scalar expression, typeglob, or a reference to a typeglob. It returns the number of bytes actually sent. On error,
$! is set appropriately and it returns undef. This function is exported by default.
Not all operating systems support sendfile(). Currently Linux, FreeBSD, Solaris, Mac OS X (version 10.5 and up) and Windows are supported.
sendfile(2) - Your manpage on sendfile
IO::Sendfile - A sendfile implementation for Linux
Sys::Syscall - Another sendfile implementation for Linux
Sys::Sendfile::FreeBSD - A module implementing the FreeBSD variant of sendfile
Leon Timmermans <firstname.lastname@example.org>
<email@example.com> wrote the Mac OS X code.
<firstname.lastname@example.org> wrote the Win32 code.
This software is copyright (c) 2008 by Leon Timmermans.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.