GPollFD corresponding to
cancellable; this can be passed
g_poll() and used to poll for cancellation. This is useful both
for unix systems without a native poll and for portability to windows.
When this function returns
TRUE, you should use
g_cancellable_release_fd() to free up resources allocated for the
pollfd. After a
FALSE return, do not call g_cancellable_release_fd().
If this function returns
FALSE, either no
cancellable was given or
resource limits prevent this function from allocating the necessary
structures for polling. (On Linux, you will likely have reached
the maximum number of file descriptors.) The suggested way to handle
these cases is to ignore the
You are not supposed to read from the fd yourself, just check for readable status. Reading to unset the readable status is done with g_cancellable_reset().
Available since: 2.22
A pointer to a
The data is owned by the caller of the method.