2014-05-05  Aurelien Jarno  <aurelien@aurel32.net>

	* sysdeps/unix/sysv/linux/ptsname.c (__ptsname_internal): return
	errno if the TIOCGPTN ioctl fails with an error different than
	EINVAL.

diff --git a/sysdeps/unix/sysv/linux/ptsname.c b/sysdeps/unix/sysv/linux/ptsname.c
--- a/sysdeps/unix/sysv/linux/ptsname.c
+++ b/sysdeps/unix/sysv/linux/ptsname.c
@@ -105,7 +105,9 @@ __ptsname_internal (int fd, char *buf, size_t buflen, struct stat64 *stp)
 
       memcpy (__stpcpy (buf, devpts), p, &numbuf[sizeof (numbuf)] - p);
     }
-  else if (errno == EINVAL)
+  else if (errno != EINVAL)
+    return errno;
+  else
 #endif
     {
       char *p;