systemd More text Zbigniew Jędrzejewski-Szmek zbyszek@in.waw.pl sd_event_get_fd 3 sd_event_get_fd Obtain a file descriptor to poll for event loop events #include <systemd/sd-bus.h> int sd_event_get_fd sd_bus *event sd_event_get_fd() returns the file descriptor that the event loop object returned by the sd_event_new3 function uses to wait for events. This file descriptor can be polled for events. This makes it possible to embed the sd-event3 event loop inside of another event loop. On success, sd_event_get_fd() returns a non-negative integer. On failure, it returns a negative errno-style error code. Returned errors may indicate the following problems: -EINVAL event is not a valid pointer to an sd_event structure. -ECHILD The event loop has been created in a different process. sd_event_get_fd() is available as a shared library, which can be compiled and linked to with the libsystemd pkg-config1 file. sd-event3, sd_event_new3, sd_event_ref3