Golang Dup2 Examples

Example #1

File: init.go Project: hsg4ok/docker

// dupSlave dup2 the pty slave's fd into stdout and stdin and ensures that
// the slave's fd is 0, or stdin
func dupSlave(slave *os.File) error {
	if slave.Fd() != 0 {
		return fmt.Errorf("slave fd not 0 %d", slave.Fd())
	}
	if err := system.Dup2(slave.Fd(), 1); err != nil {
		return err
	}
	if err := system.Dup2(slave.Fd(), 2); err != nil {
		return err
	}
	return nil
}

Example #2

File: init.go Project: jpgbus/docker

// dupSlave dup2 the pty slave's fd into stdout and stdin and ensures that
// the slave's fd is 0, or stdin
func dupSlave(slave *os.File) error {
	if err := system.Dup2(slave.Fd(), 0); err != nil {
		return err
	}
	if err := system.Dup2(slave.Fd(), 1); err != nil {
		return err
	}
	if err := system.Dup2(slave.Fd(), 2); err != nil {
		return err
	}
	return nil
}

Example #3

File: console.go Project: newgoliath/docker

func OpenAndDup(consolePath string) error {
	slave, err := system.OpenTerminal(consolePath, syscall.O_RDWR)
	if err != nil {
		return fmt.Errorf("open terminal %s", err)
	}
	if err := system.Dup2(slave.Fd(), 0); err != nil {
		return err
	}
	if err := system.Dup2(slave.Fd(), 1); err != nil {
		return err
	}
	return system.Dup2(slave.Fd(), 2)
}