Jakub Kicinski kuba@kernel.org writes:
There's a common synchronization problem when a script (Python test) uses a C program to set up some state (usually start a receiving process for traffic). The script needs to know when the process has fully initialized. The inverse of the problem exists for shutting the process down - we need a reliable way to tell the process to exit.
We added helpers to do this safely in commit 71477137994f ("selftests: drv-net: add a way to wait for a local process") unfortunately the two operations (wait for init, and shutdown) are controlled by a single parameter (ksft_wait). Add support for using ksft_ready without using the second fd for exit.
This is useful for programs which wait for a specific number of packets to rx so exit_wait is a good match, but we still need to wait for init.
Signed-off-by: Jakub Kicinski kuba@kernel.org
Reviewed-by: Petr Machata petrm@nvidia.com