tevent: fd events do not work correctly for UDP socket?

Pavel Březina pbrezina at redhat.com
Tue Aug 18 11:46:09 UTC 2020

When I connect to a port over UDP and nobody listens on the port tevent 
fires immediately read fd event even though there is no data available.

Simple reproducer is attached. Just run 'make && ./client' and see that 
read_handler is executed immediately. When there is a process listening 
(nc -ul 3333) the handler is fired only when data is available.

This probably boils down to epoll_wait but not being an epoll export, 
I'd like to ask if there is something that can be done about it or if it 
is an expected behavior.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: main.c
Type: text/x-csrc
Size: 1692 bytes
Desc: not available
URL: <http://lists.samba.org/pipermail/samba-technical/attachments/20200818/877bc202/main.c>
-------------- next part --------------
all: client

client: ./main.c
	gcc -ggdb3 -o client ./main.c -ltalloc -ltevent

	rm -f client

More information about the samba-technical mailing list