TTY/Serial Baudrate changer for Go

tc.go

package tc

// Package contains one function to set TTY speed.

/*#include <stddef.h>
#include <stdlib.h>
#include <termios.h>*/
import "C"

import (
	"os"
	"unsafe"
)

/* Pass an open TTY/CU. Error handling is probably a bit borked. 
Works on Mac OS X 10.5, compiles on Linux, though I never tried 
to run it there. */
func Setspeed(f *os.File, speed int) (os.Error) {
	serfd := f.Fd()
	var tio C.struct_termios;

	res, err := C.tcgetattr(C.int(serfd), (*C.struct_termios)(unsafe.Pointer(&tio)))
	if res != 0 || err != nil {
		return err
	}

	C.cfmakeraw((*C.struct_termios)(unsafe.Pointer(&tio)))

	res, err = C.cfsetspeed((*C.struct_termios)(unsafe.Pointer(&tio)), C.speed_t(speed))
	if res != 0 || err != nil {
		return err
	}

	res, err = C.tcsetattr(C.int(serfd), C.TCSANOW, (*C.struct_termios)(unsafe.Pointer(&tio)))
	if res != 0 || err != nil {
		return err
	}

	return nil
}