X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Funlockpt.c;h=d5ca61dd5f13d6f01da135926a17ff46862576aa;hb=0874a5828bbb4784e9c9d54243b3c978e8e54ece;hp=f2becab23753394f520b7e2e9a3d442c2c4cb6a5;hpb=e6c527d59af1fd07e33830f72c8c93e31cfd3738;p=gnulib.git

diff --git a/lib/unlockpt.c b/lib/unlockpt.c
index f2becab23..d5ca61dd5 100644
--- a/lib/unlockpt.c
+++ b/lib/unlockpt.c
@@ -1,5 +1,5 @@
 /* Unlock the slave side of a pseudo-terminal from its master side.
-   Copyright (C) 1998, 2010 Free Software Foundation, Inc.
+   Copyright (C) 1998, 2010-2012 Free Software Foundation, Inc.
    Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
 
    This program is free software: you can redistribute it and/or modify
@@ -19,6 +19,7 @@
 
 #include <stdlib.h>
 
+#include <fcntl.h>
 #include <unistd.h>
 
 int
@@ -36,6 +37,8 @@ unlockpt (int fd)
 #else
   /* Assume that the slave side of a pseudo-terminal is already unlocked
      by default.  */
+  if (fcntl (fd, F_GETFD) < 0)
+    return -1;
   return 0;
 #endif
 }