read function always interrupted system call

[miniboom360]

Hello, I running on macOS sierra 10.12.6. I tried exactly as the example (except the port name, port name is cu.usbserial1 in my macBook). I sucessfully write string to the port but failed to read from it. it always return error. the error is called "read /dev/cu.usbserial1: interrupted system call", i've tried several times to send, but Disappointing results. any suggestions?

here is the code:

`import (
"fmt"
"github.com/tarm/serial"
"testing"
)

func TestTarmSerialDataRecvAndSend(t *testing.T) {
c := &serial.Config{
Name: "/dev/cu.usbserial1",
Baud: 9600,
}

s, err := serial.OpenPort(c)
if err != nil {
	fmt.Println(err)
	return
}

for i := 0; i < 10; i++ {
	n, err := s.Write([]byte("test"))
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Printf("send byte : %v",n)
}

fmt.Println("send over")

buf := make([]byte, 128)
n, err := s.Read(buf)
if err != nil{
	fmt.Println(err)
	return
}

fmt.Printf("%q", buf[:n])

}
`

[polomsky]

I have the same problem on linux arm with Go 1.14. Handling of syscall error EINTR should be ignored.

for {
	n, err := s.Read(buf)
	switch err := err.(type) {
		case syscall.Errno:
			if err == syscall.EINTR {
				// interruption by signal - ignore it (e.g. caused by Go)
				continue
			}
		}
	}
	break;
}