添加 github.com/pion/dtls 代码

dtls-2.0.9/errors_errno.go

@@ -0,0 +1,25 @@
+// +build aix darwin dragonfly freebsd linux nacl nacljs netbsd openbsd solaris windows
+
+// For systems having syscall.Errno.
+// Update build targets by following command:
+// $ grep -R ECONN $(go env GOROOT)/src/syscall/zerrors_*.go \
+//     | tr "." "_" | cut -d"_" -f"2" | sort | uniq
+
+package dtls
+
+import (
+	"os"
+	"syscall"
+)
+
+func isOpErrorTemporary(err *os.SyscallError) bool {
+	if ne, ok := err.Err.(syscall.Errno); ok {
+		switch ne {
+		case syscall.ECONNREFUSED:
+			return true
+		default:
+			return false
+		}
+	}
+	return false
+}