fix(readline): check stdin error properly

readline/readline.go

@@ -2,6 +2,7 @@ package readline
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"os"
 	"regexp"
@@ -78,9 +79,7 @@ func (rl *Instance) Readline() (string, error) {
 			var err error
 			i, err = os.Stdin.Read(b)
 			if err != nil {
-				// i shouldnt really check the error like this but i dont know what
-				// the actual thing is so
-				if err.Error() == "read /dev/stdin: resource temporarily unavailable" {
+				if errors.Is(err, syscall.EAGAIN) {
 					err = syscall.SetNonblock(syscall.Stdin, false)
 					if err == nil {
 						continue