librelp 1.5.0 [download]
This new release of librelp is mostly for bugfixing. Most importantly, in this version a severe shutdown issue was fixed that introduced a long delay in the shutdown procedure.
For more details, please take a look at the changelog below.
– bugfix: too late termination of relp Engine on shutdown
When librelp is instructed to shutdown, it processes messages
still present inside its receive buffers. It only terminates
when it needs to wait for new data to arrive.
Depending on RELP and TCP window size and message length,
this may cause many messages to be processed while in shutdown.
Even with default settings, up to 128 messages may be taken off
the wire and be processed.
This is a problem regarding the shutdown timing of a librelp
user (e.g. rsyslog). It may take unexpectedly long to shutdown
the RELP component and as such timeout may occur in the caller
code. This is especially the case if the caller does lengthy
processing when a RELP message is received. Note: It is
perfectly fine for a caller to do this. The problem is that
librelp continues to provide new data for a relatively long
and unexpected period.
This fix ensure that the relp engine shuts down much quicker
when shutdown is requested. It now also checks the shutdown
request while processing already received buffer data.
This problem was detected when working on
see also https://github.com/rsyslog/rsyslog/issues/3941
– build system fix: invalid default in configure help text
– error message on invalid TLS library request added
This way an invalid TLS library (name) can be detected and the
error presented to the user. So far, invalid library names were
hard to find.