Cancellable.makePollfd

Creates a #GPollFD corresponding to @cancellable; this can be passed to 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 @cancellable.

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().

class Cancellable
bool
makePollfd

Parameters

pollfd GPollFD*

a pointer to a #GPollFD

Return: %TRUE if @pollfd was successfully initialized, %FALSE on failure to prepare the cancellable.

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Since

2.22