// List the serial ports available on the system.
func ListPorts() ([]*Info, error) {
var p **C.struct_sp_port
if err := C.sp_list_ports(&p); err != C.SP_OK {
return nil, errmsg(err)
}
defer C.sp_free_port_list(p)
// Convert the C array into a Go slice
// See: https://code.google.com/p/go-wiki/wiki/cgo
pp := (*[1 << 15]*C.struct_sp_port)(unsafe.Pointer(p))
// count number of ports
c := 0
for ; uintptr(unsafe.Pointer(pp[c])) != 0; c++ {
}
// populate
ports := make([]*Info, c)
for j := 0; j < c; j++ {
var pc *C.struct_sp_port
if err := errmsg(C.sp_copy_port(pp[j], &pc)); err != nil {
return nil, err
}
if sp, err := newInfo(pc); err != nil {
return nil, err
} else {
ports[j] = sp
}
}
return ports, nil
}
// Wrap a sp_port struct in a go Port struct and set finalizer for
// garbage collection.
func newPort(info *Info) (*Port, error) {
port := &Port{}
// copy info
if info != nil {
if err := errmsg(C.sp_copy_port(info.p, &port.p)); err != nil {
return nil, err
}
}
// set finalizers
runtime.SetFinalizer(port, (*Port).free)
return port, nil
}