On failure, these functions return a negative errno-style error code.
sd_event_run() returns a positive, non-zero integer if an event
source was dispatched, and zero when the specified timeout hit before
an event source has seen any event, and hence no event source was
dispatched. sd_event_loop() returns the exit code specified when
Returned errors may indicate the following problems:
The event parameter is invalid or NULL.
The event loop object is not in the right state (see
sd_event_prepare(3) for an explanation of possible states).
The event loop is already terminated.
The event loop has been created in a different process.
Other errors are possible, too.
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⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
page was obtained from the project's upstream Git repository
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COLOPHON (which is not part of the original manual page), send a mail
systemd 233 SD_EVENT_RUN(3)