poll

fun poll(fds: PollFD, nfds: <Error class: unknown class>, timeout: Int): Int

Polls @fds, as with the poll() system call, but portably. (On systems that don't have poll(), it is emulated using select().) This is used internally by #GMainContext, but it can be called directly if you need to block until a file descriptor is ready, but don't want to run the full main loop.

Each element of @fds is a #GPollFD describing a single file descriptor to poll. The @fd field indicates the file descriptor, and the @events field indicates the events to poll for. On return, the @revents fields will be filled with the events that actually occurred.

On POSIX systems, the file descriptors in @fds can be any sort of file descriptor, but the situation is much more complicated on Windows. If you need to use g_poll() in code that has to run on Windows, the easiest solution is to construct all of your #GPollFDs with g_io_channel_win32_make_pollfd().

Return

the number of entries in @fds whose @revents fields were filled in, or 0 if the operation timed out, or -1 on error or if the call was interrupted.

Since

2.20

Parameters

fds

file descriptors to poll

nfds

the number of file descriptors in @fds

timeout

amount of time to wait, in milliseconds, or -1 to wait forever