1 files changed, 38 insertions, 0 deletions
diff --git a/sysdeps/nacl/isatty.c b/sysdeps/nacl/isatty.c
new file mode 100644
index 0000000000..fc1a686bae
--- /dev/null
+++ b/sysdeps/nacl/isatty.c
@@ -0,0 +1,38 @@
+/* Determine if a file descriptor refers to a terminal.  NaCl version.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <nacl-interfaces.h>
+
+/* Return 1 if FD is a terminal, 0 if not.  */
+int
+__isatty (int fd)
+{
+  int result;
+  int error = __nacl_irt_dev_fdio.isatty (fd, &result);
+  if (error == 0)
+    {
+      if (result)
+	return 1;
+      error = ENOTTY;
+    }
+  errno = error;
+  return 0;
+}
+weak_alias (__isatty, isatty)