Function iio_create_scan_context 

pub unsafe extern "C" fn iio_create_scan_context(
    backend: *const c_char,
    flags: c_uint,
) -> *mut iio_scan_context

@brief Create a scan context @param backend A NULL-terminated string containing a comma-separated list of the backend(s) to use for scanning. @param flags Unused for now. Set to 0. @return on success, a pointer to a iio_scan_context structure @return On failure, NULL is returned and errno is set appropriately

NOTE: Libiio version 0.20 and above can handle multiple strings, for instance “local:usb:”, “ip:usb:”, “local:usb:ip:”, and require a colon as the delimiter. Libiio version 0.24 and above prefer a comma instead of colon as the delimiter, and handle specifying backend-specific information. For instance, “local,usb=0456:*” will scan the local backend and limit scans on USB to vendor ID 0x0456, and accept all product IDs. The “usb=0456:b673” string would limit the scan to the device with this particular VID/PID. Both IDs are expected in hexadecimal, no 0x prefix needed.