1 files changed, 39 insertions, 0 deletions
diff --git a/sysdeps/unix/bsd/isatty.c b/sysdeps/unix/bsd/isatty.c
new file mode 100644
index 0000000000..c3e80eb1c3
--- /dev/null
+++ b/sysdeps/unix/bsd/isatty.c
@@ -0,0 +1,39 @@
+/* Copyright (C) 1991, 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+/* Return 1 if FD is a terminal, 0 if not.  */
+int
+DEFUN(__isatty, (fd), int fd)
+{
+  int save;
+  int is_tty;
+  struct sgttyb term;
+
+  save = errno;
+  is_tty = __ioctl (fd, TIOCGETP, &term) == 0;
+  errno = save;
+
+  return is_tty;
+}
+
+weak_alias (__isatty, isatty)