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If we take a long time to process log messages, and during that time journal file rotation occurs, the journald client library will keep those rotated files open until sd_journal_process() is called. By periodically calling sd_journal_process() during the processing loop we shrink the window of time a client instance has open file descriptors for rotated (deleted) journal files. This code is modelled after that of journalctl [1]; the above explanation as well as the value of 1024 is taken from there. [v2: fix CErr() argument] [1] https://github.com/systemd/systemd/blob/dc16327c48d/src/journal/journalctl.c#L2676 Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> (cherry picked from commit b73fb8fd5d521081c92b5c2cce334c21b2e0ff5f) Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> Upstream-commit: 48160719f2c5734b513aec7cedbbca0c72f4a085 Component: engine