v2: remove unnecessary elif and else after return in
wait_server_addr()
v3: use IOError instead of FileNotFoundError for python2
compatibility
Signed-off-by: Zeyad Yasser <zeyady98@gmail.com>
When criu dumps a process with --tcp-established opt it locks
the open tcp connections so that no packets from peer enters
the stack, otherwise RST will be sent by a kernel causing the
connection to fail.
Post-start hook creates a connection with the test server and
creates a background thread that stays alive for the duration
of the test. This background thread sends data to the test
server at three stages:
- Pre-dump: Should send normally
- Pre-restore:
If connection is locked properly, packets will be dropped
and TCP will just retry, which will eventually be sent when
the process is restored and the network is unlocked.
- Post-restore: Should send normally
Data sent at the three stages is then checked at the server's side.
v2:
- remove unused imports and constants
- delete sync file in wait_sync_file() instead of --clean
v3:
- add comments
Co-developed-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>
Signed-off-by: Zeyad Yasser <zeyady98@gmail.com>
