tst_checkpoint_signal_child: implemented timeout
If a child exits before opening TST_CHECKPOINT_FIFO
for reading, tst_checkpoint_signal_child() issued from the parent
will block forever.
To handle such situations added timeout logic to tst_checkpoint_signal_child();
Signed-off-by: Stanislav Kholmanskikh <firstname.lastname@example.org>
Reviewed-by: Jan Stancek <email@example.com>
Acked-by: Cyril Hrubis <firstname.lastname@example.org>
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