sd_event_source_set_description() may be used to set an arbitrary
descriptive name for the event source object specified as source.
This name will be used in debugging messages generated by sd-event(3)
for this event source, and may be queried using
sd_event_source_get_description() for debugging purposes. The
description parameter shall point to a NUL-terminated string or be
NULL. In the latter case, the descriptive name will be unset. The
string is copied internally, hence the description argument is not
referenced after the function returns.
sd_event_source_get_description() may be used to query the current
descriptive name assigned to the event source object source. It
returns a pointer to the current name in description, stored in
memory internal to the event source. The memory is invalidated when
the event source is destroyed or the descriptive name is changed.
Event source objects generally have no description set when they are
created, except for UNIX signal event sources created with
sd_event_add_signal(3), whose descriptive name is initialized to the
signal's C constant name (e.g. "SIGINT" or "SIGTERM").
Returned errors may indicate the following problems:
-EINVALsource is not a valid pointer to an sd_event_source object or the
description argument for sd_event_source_get_description() is
Not enough memory to copy the name.
The event loop has been created in a different process.
No name was set for the event source.
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systemd 233 SD_EVENT_SOURCE_SET_DESCRIPTION(3)