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Adaptive Overlays for Shared Stream Processing Environments
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Sys::Virt::Stream(3pm) User Contributed Perl Documentation Sys::Virt::Stream(3pm) NAME
Sys::Virt::Stream - Represent & manage a libvirt stream DESCRIPTION
The "Sys::Virt::Stream" module represents a stream managed by the virtual machine monitor. METHODS
my $st Sys::Virt::Stream->new($conn, $flags); Creates a new data stream, ready for use with a stream based API. The optional $flags parameter can be used to configure the stream as non-blocking $st->abort() Abort I/O on the stream. Either this function or "finish" must be called on any stream which has been activated $st->finish() Complete I/O on the stream. Either this function or "abort" must be called on any stream which has been activated $rv = $st->recv($data, $nbytes) Receive upto $nbytes worth of data, copying into $data. Returns the number of bytes read, or -2 if I/O would block, or -1 on error. $rv = $st->send($data, $nbytes) Send upto $nbytes worth of data, copying from $data. Returns the number of bytes sent, or -2 if I/O would block, or -1 on error. $st->recv_all($handler) Receive all data available from the stream, invoking $handler to process the data. The $handler parameter must be a function which expects three arguments, the $st stream object, a scalar containing the data received and a data byte count. The function should return the number of bytes processed, or -1 upon error. $st->send_all($handler) Send all data produced by $handler to the stream. The $handler parameter must be a function which expects three arguments, the $st stream object, a scalar which must be filled with data and a maximum data byte count desired. The function should return the number of bytes filled, 0 on end of file, or -1 upon error $st->add_callback($events, $coderef) Register a callback to be invoked whenever the stream has one or more events from $events mask set. The $coderef must be a subroutine that expects 2 parameters, the original $st object and the new $events mask $st->update_callback($events) Change the event mask for a previously registered callback to $events $st->remove_callback(); Remove a previously registered callback CONSTANTS
Sys::Virt::Stream::NONBLOCK Create a stream which will not block when performing I/O Sys::Virt::Stream::EVENT_READABLE The stream has data available for read without blocking Sys::Virt::Stream::EVENT_WRITABLE The stream has ability to write data without blocking Sys::Virt::Stream::EVENT_ERROR An error occurred on the stream Sys::Virt::Stream::EVENT_HANGUP The remote end of the stream closed AUTHORS
Daniel P. Berrange <berrange@redhat.com> COPYRIGHT
Copyright (C) 2006-2009 Red Hat Copyright (C) 2006-2007 Daniel P. Berrange LICENSE
This program is free software; you can redistribute it and/or modify it under the terms of either the GNU General Public License as published by the Free Software Foundation (either version 2 of the License, or at your option any later version), or, the Artistic License, as specified in the Perl README file. SEE ALSO
Sys::Virt, Sys::Virt::Error, "http://libvirt.org" perl v5.14.2 2012-05-21 Sys::Virt::Stream(3pm)
