1 files changed, 48 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ttyname.h b/sysdeps/unix/sysv/linux/ttyname.h
new file mode 100644
index 0000000000..8ef0a16101
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ttyname.h
@@ -0,0 +1,48 @@
+/* Copyright (C) 2016-2018 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; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <stdbool.h>
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+/* Return true if this is a UNIX98 pty device, as defined in
+   linux/Documentation/devices.txt (on linux < 4.10) or
+   linux/Documentation/admin-guide/devices.txt (on linux >= 4.10).  */
+static inline bool
+is_pty (struct stat64 *sb)
+{
+#ifdef _STATBUF_ST_RDEV
+  int m = __gnu_dev_major (sb->st_rdev);
+  return (136 <= m && m <= 143);
+#else
+  return false;
+#endif
+}
+
+static inline bool
+is_mytty (const struct stat64 *mytty, const struct stat64 *maybe)
+{
+  return (maybe->st_ino == mytty->st_ino
+	  && maybe->st_dev == mytty->st_dev
+#ifdef _STATBUF_ST_RDEV
+	  && S_ISCHR (maybe->st_mode)
+	  && maybe->st_rdev == mytty->st_rdev
+#endif
+	  );
+}