SD_EVENT_SOURCE_GET_PENDINsd_event_source_get_peSD_EVENT_SOURCE_GET_PENDING(3)

NAME
       sd_event_source_get_pending - Determine pending state of event sources

SYNOPSIS
       #include <systemd/sd-event.h>

       int sd_event_source_get_pending(sd_event_source *source);

DESCRIPTION
       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 manual
       pages.

       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.

RETURN VALUE
       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.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           source is not a valid pointer to an sd_event_source object.

       -EDOM
           source refers to an event source object created with
           sd_event_add_exit(3).

       -ENOMEM
           Not enough memory.

       -ESTALE
           The event loop is already terminated.

       -ECHILD
           The event loop has been created in a different process.

NOTES
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

SEE ALSO
       sd-event(3), sd_event_add_io(3), sd_event_add_time(3),
       sd_event_add_signal(3), sd_event_add_child(3), sd_event_add_inotify(3),
       sd_event_add_defer(3), sd_event_source_unref(3)

systemd 252                                     SD_EVENT_SOURCE_GET_PENDING(3)

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