6.1.2.3. FE_READ_SIGNAL_STRENGTH

6.1.2.3.1. Name

FE_READ_SIGNAL_STRENGTH

注意

This ioctl is deprecated.

6.1.2.3.2. Synopsis

int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)

6.1.2.3.3. Arguments

fd

File descriptor returned by open().

strength

The signal strength value is stored into *strength.

6.1.2.3.4. Description

This ioctl call returns the signal strength value for the signal currently received by the front-end. For this command, read-only access to the device is sufficient.

6.1.2.3.5. 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.