1 files changed, 5 insertions, 16 deletions
diff --git a/sysdeps/unix/sysv/linux/unlockpt.c b/sysdeps/unix/sysv/linux/unlockpt.c
index 3a0ac7a96c..4d98abece0 100644
--- a/sysdeps/unix/sysv/linux/unlockpt.c
+++ b/sysdeps/unix/sysv/linux/unlockpt.c
@@ -27,22 +27,11 @@
 int
 unlockpt (int fd)
 {
-#ifdef TIOCSPTLCK
-  int save_errno = errno;
   int unlock = 0;
 
-  if (__ioctl (fd, TIOCSPTLCK, &unlock))
-    {
-      if (errno == EINVAL)
-	{
-	  __set_errno (save_errno);
-	  return 0;
-	}
-      else
-	return -1;
-    }
-#endif
-  /* If we have no TIOCSPTLCK ioctl, all slave pseudo terminals are
-     unlocked by default.  */
-  return 0;
+  int ret = __ioctl (fd, TIOCSPTLCK, &unlock);
+  if (ret != 0 && errno == ENOTTY)
+    /* POSIX mandates EINVAL for non-ptmx descriptors.  */
+    __set_errno (EINVAL);
+  return ret;
 }