sd_event_source_get_pending() may be used to determine whether the
event source object specified as source has seen events but has not
been dispatched yet (and thus is marked "pending").
Event source objects initially are not marked pending, when they are
created with calls such as sd_event_add_io(3), sd_event_add_time(3),
with the exception of those created with sd_event_add_defer(3) which
are immediately marked pending, and sd_event_add_exit(3) for which
the "pending" concept is not defined. For details see the respective
In each event loop iteration one event source of those marked pending
is dispatched, in the order defined by the event source priority, as
set with sd_event_source_set_priority(3).
For I/O event sources, as created with sd_event_add_io(3), the call
sd_event_source_get_io_revents(3) may be used to query the type of
event pending in more detail.
On success, sd_event_source_get_pending() returns an integer greater
than zero when the event source is marked pending, and zero when the
event source is not marked pending. On failure, it returns a negative
errno-style error code.
Returned errors may indicate the following problems:
-EINVALsource is not a valid pointer to an sd_event_source object.
-EDOMsource refers to an event source object created with
Not enough memory.
The event loop is already terminated.
The event loop has been created in a different process.
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systemd 233 SD_EVENT_SOURCE_GET_PENDING(3)