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mention that libtorrent listens on port 0 sometimes in the docs

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Arvid Norberg 2010-01-05 13:05:29 +00:00
parent 08444d0c2f
commit 7b1b241dec
1 changed files with 9 additions and 1 deletions
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10
docs/manual.rst
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@ -897,7 +897,10 @@ the range and so on. The interface parameter can be left as 0, in that case the
os will decide which interface to listen on, otherwise it should be the ip-address os will decide which interface to listen on, otherwise it should be the ip-address
of the interface you want the listener socket bound to. ``listen_on()`` returns true of the interface you want the listener socket bound to. ``listen_on()`` returns true
if it managed to open the socket, and false if it failed. If it fails, it will also if it managed to open the socket, and false if it failed. If it fails, it will also
generate an appropriate alert (listen_failed_alert_). generate an appropriate alert (listen_failed_alert_). If all ports in the specified
range fails to be opened for listening, libtorrent will try to use port 0 (which
tells the operating system to pick a port that's free). If that still fails you
may see a listen_failed_alert_ with port 0 even if you didn't ask to listen on it.
The interface parameter can also be a hostname that will resolve to the device you The interface parameter can also be a hostname that will resolve to the device you
want to listen on. If you don't specify an interface, libtorrent may attempt to want to listen on. If you don't specify an interface, libtorrent may attempt to
@ -4907,6 +4910,11 @@ session_ can be opened for listening. The ``endpoint`` member is the
interface and port that failed, ``error`` is the error code describing interface and port that failed, ``error`` is the error code describing
the failure. the failure.
libtorrent may sometimes try to listen on port 0, if all other ports failed.
Port 0 asks the operating system to pick a port that's free). If that fails
you may see a listen_failed_alert_ with port 0 even if you didn't ask to
listen on it.
:: ::
struct listen_failed_alert: alert struct listen_failed_alert: alert