2.4.5. ioctl FE_SET_PROPERTY, FE_GET_PROPERTY¶
2.4.5.1. Name¶
FE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties.
2.4.5.2. Synopsis¶
-
int
ioctl
(int fd, FE_GET_PROPERTY, struct dtv_properties *argp)¶
-
int
ioctl
(int fd, FE_SET_PROPERTY, struct dtv_properties *argp)¶
2.4.5.3. Arguments¶
fd
- File descriptor returned by open().
argp
- Pointer to struct
dtv_properties
.
2.4.5.4. Description¶
All Digital TV frontend devices support the FE_SET_PROPERTY
and
FE_GET_PROPERTY
ioctls. The supported properties and statistics
depends on the delivery system and on the device:
FE_SET_PROPERTY:
- This ioctl is used to set one or more frontend properties.
- This is the basic command to request the frontend to tune into some frequency and to start decoding the digital TV signal.
- This call requires read/write access to the device.
- At return, the values are updated to reflect the actual parameters used.
FE_GET_PROPERTY:
- This ioctl is used to get properties and statistics from the frontend.
- No properties are changed, and statistics aren’t reset.
- This call only requires read-only access to the device.
2.4.5.5. Return Value¶
On success 0 is returned.
On error -1 is returned, and the errno
variable is set
appropriately.
Generic error codes are described at the Generic Error Codes chapter.