(ITS#5133) Synchronous replication on slave doesn't notice lost network connection

[audrius.valunas@teo.lt]

Full_Name: Audrius Valunas
Version: openldap2-2.3.27-25
OS: SUSE LINUX 10.0 (i586) OSS 
URL: 
Submission from: (NULL) (212.59.0.201)


There is synchronous replication between mastyer and slave. When network
connectivity problems occur master closes tcp connection but slave doesn't
notice those problems, it still has tcp connection open, but in real it is not
receiving updates any more.
I think that can be solved adding some ack from slave because sending on such a
socket would fail and force slave to retry connection.