tests: add basic build progress test

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

vendor/github.com/creack/pty/pty_netbsd.go

@@ -0,0 +1,69 @@
+//go:build netbsd
+// +build netbsd
+
+package pty
+
+import (
+	"errors"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+func open() (pty, tty *os.File, err error) {
+	p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
+	if err != nil {
+		return nil, nil, err
+	}
+	// In case of error after this point, make sure we close the ptmx fd.
+	defer func() {
+		if err != nil {
+			_ = p.Close() // Best effort.
+		}
+	}()
+
+	sname, err := ptsname(p)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if err := grantpt(p); err != nil {
+		return nil, nil, err
+	}
+
+	// In NetBSD unlockpt() does nothing, so it isn't called here.
+
+	t, err := os.OpenFile(sname, os.O_RDWR|syscall.O_NOCTTY, 0)
+	if err != nil {
+		return nil, nil, err
+	}
+	return p, t, nil
+}
+
+func ptsname(f *os.File) (string, error) {
+	/*
+	 * from ptsname(3): The ptsname() function is equivalent to:
+	 * struct ptmget pm;
+	 * ioctl(fd, TIOCPTSNAME, &pm) == -1 ? NULL : pm.sn;
+	 */
+	var ptm ptmget
+	if err := ioctl(f.Fd(), uintptr(ioctl_TIOCPTSNAME), uintptr(unsafe.Pointer(&ptm))); err != nil {
+		return "", err
+	}
+	name := make([]byte, len(ptm.Sn))
+	for i, c := range ptm.Sn {
+		name[i] = byte(c)
+		if c == 0 {
+			return string(name[:i]), nil
+		}
+	}
+	return "", errors.New("TIOCPTSNAME string not NUL-terminated")
+}
+
+func grantpt(f *os.File) error {
+	/*
+	 * from grantpt(3): Calling grantpt() is equivalent to:
+	 * ioctl(fd, TIOCGRANTPT, 0);
+	 */
+	return ioctl(f.Fd(), uintptr(ioctl_TIOCGRANTPT), 0)
+}