a bitwise combination from GIOCondition, specifying which events should be polled for. Typically for reading from a file descriptor you would use G_IO_IN | G_IO_HUP | G_IO_ERR, and for writing you would use G_IO_OUT | G_IO_ERR.
the file descriptor to poll (or a HANDLE on Win32)
a bitwise combination of flags from GIOCondition, returned from the poll() function to indicate which events occurred.
Represents a file descriptor, which events to poll for, and which events occurred.