PollableReturn

Return value for various IO operations that signal errors via the return value and not necessarily via a Error .

This enum exists to be able to return errors to callers without having to allocate a Error. Allocating Errors can be quite expensive for regularly happening errors like g_io_error_would_block.

In case of g_pollable_return_failed a Error should be set for the operation to give details about the error that happened.