#include <libexplain/string_buffer.h>

Enumerations
enum	explain_v4l2_queryctrl_check_id_t { explain_v4l2_queryctrl_check_id_no_idea, explain_v4l2_queryctrl_check_id_nosuch, explain_v4l2_queryctrl_check_id_notsup, explain_v4l2_queryctrl_check_id_ok }
Functions
void	explain_buffer_v4l2_queryctrl (explain_string_buffer_t sb, const struct v4l2_queryctrl data, int extra, int fildes)
enum explain_v4l2_queryctrl_check_id_t	explain_v4l2_queryctrl_check_id (int fildes, const struct v4l2_queryctrl *data)

Enumeration Type Documentation

Enumerator:

explain_v4l2_queryctrl_check_id_no_idea
explain_v4l2_queryctrl_check_id_nosuch
explain_v4l2_queryctrl_check_id_notsup
explain_v4l2_queryctrl_check_id_ok

Definition at line 42 of file v4l2_queryctrl.h.

Function Documentation

void explain_buffer_v4l2_queryctrl	(	explain_string_buffer_t *	sb,
		const struct v4l2_queryctrl *	data,
		int	extra,
		int	fildes
	)

The explain_buffer_v4l2_queryctrl function may be used to print a representation of a v4l2_queryctrl structure.

Parameters:

sb	The string buffer to print into.
data	The v4l2_queryctrl structure to be printed.
extra	print the return values if true.
fildes	Thes associated file descriptor (for additional details, if necessary)

enum explain_v4l2_queryctrl_check_id_t explain_v4l2_queryctrl_check_id	(	int	fildes,
		const struct v4l2_queryctrl *	data
	)

The explain_v4l2_queryctrl_check_id function is used to check the id member of a v4l2_queryctrl struct.

Parameters:

fildes	The associated file descriptor
data	The control struct to have its id member checked.

Returns:: no_idea if the file descriptor is unhelpful or the pointer is efault, nosuch if there is no such control id, notsup if the control id exists, but is not supported by the device, ok if nothing wrong could be found.