LINUX DVB API Version 3 - Linux TV.org

40 DVB VIDEO DEVICE
4.2.10 VIDEO GET STATUS
DESCRIPTION
This ioctl call asks the Video Device to return the current status of the device.
SYNOPSIS
int ioctl(fd, int request = VIDEO GET STATUS, struct
video status *status);
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO GET STATUS for this command.
struct
*status
video status Returns the current status of the Video Device.
ERRORS
EBADF fd is not a valid open file descriptor
EINTERNAL Internal error, possibly in the communication with the
DVB subsystem.
EFAULT status points to invalid address
4.2.11 VIDEO GET EVENT
DESCRIPTION
This ioctl call returns an event of type video event if available. If an event is not
available, the behavior depends on whether the device is in blocking or nonblocking
mode. In the latter case, the call fails immediately with errno set to
EWOULDBLOCK. In the former case, the call blocks until an event becomes
available. The standard Linux poll() and/or select() system calls can be used
with the device file descriptor to watch for new events. For select(), the file
descriptor should be included in the exceptfds argument, and for poll(), POLL-
PRI should be specified as the wake-up condition. Read-only permissions are
sufficient for this ioctl call.
SYNOPSIS
int ioctl(fd, int request = VIDEO GET EVENT, struct
video event *ev);
PARAMETERS
int fd File descriptor returned by a previous call to open().
int request Equals VIDEO GET EVENT for this command.
struct video event
*ev
Points to the location where the event, if any, is to be
stored.
ERRORS
EBADF fd is not a valid open file descriptor
EFAULT ev points to invalid address
EWOULDBLOCK There is no event pending, and the device is in nonblocking
mode.
EOVERFLOW
Overflow in event queue - one or more events were lost.
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