NAME

Sys::Sendfile - Zero-copy data transfer

VERSION

version 0.16

SYNOPSIS

 use Sys::Sendfile;
 sendfile $sink, $source, $count;

DESCRIPTION

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.

FUNCTIONS

sendfile $out, $in, $count, $offset

This function sends up to $count bytes starting from $offset from $in to $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. $in and $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.

BUGS AND LIMITATIONS

Not all operating systems support sendfile(). Currently Linux, FreeBSD, Solaris, Mac OS X (version 10.5 and up) and Windows are supported.

AUTHOR

Leon Timmermans <leont@cpan.org>

CONTRIBUTORS

Kazuho Oku "<kazuhooku@gmail.com>" wrote the Mac OS X code.

Yasuhiro Matsumoto "<mattn.jp@gmail.com>" wrote the Win32 code.

COPYRIGHT AND LICENSE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.