Query live connections?

Wayne Davison wayned at samba.org
Wed Jan 6 23:02:54 MST 2010

On Wed, Jan 6, 2010 at 2:06 PM, Erich Weiler <weiler at soe.ucsc.edu> wrote:

> 2: Or better yet, how does rsync itself check for the number of
> connections?

See the connection.c file in the rsync source for the file locking used
(which calls a routine in util.c).  Rsync tries to lock a 4-byte range in
the file, starting from the start and incrementing by 4 bytes for each slot.
 So, one way to check for the number of lockers is to use fcntl() with
F_GETLK to query the presence of existing locks on the lockfile.

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