cdev_input_num_available()

Check how much space is available in a character device's input buffer

Synopsis:

#include <qvm/cdev.h>
static unsigned cdev_input_num_available(const struct cdev_state *const cds)

Arguments:

cds
A pointer to a structure with the character device state (see cdev_state).

Description:

This function reports the amount of space that is available in the input buffer for the specified host device. Calling this function makes sense only if you are using the internal buffers (i.e., you specified a non-zero buffer size when calling cdev_setup()).

Returns:

If successful, the number of characters that may still be placed in the device's input buffer; otherwise, a negative errno value.

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