2 files changed, 66 insertions, 0 deletions

diff --git a/lib/ttyname_r.c b/lib/ttyname_r.c
new file mode 100644
index 0000000000..dc8b923f1b
--- /dev/null
+++ b/lib/ttyname_r.c
@@ -0,0 +1,47 @@
+/* Determine name of a terminal.
+
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2010.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include <errno.h>
+#include <string.h>
+
+int
+ttyname_r (int fd, char *buf, size_t buflen)
+{
+#if HAVE_TTYNAME
+  /* Note: This is not multithread-safe.  */
+  char *name;
+  size_t namelen;
+
+  name = ttyname (fd);
+  if (name == NULL)
+    return errno;
+  namelen = strlen (name) + 1;
+  if (namelen > buflen)
+    return ERANGE;
+  memcpy (buf, name, namelen);
+  return 0;
+#else
+  /* Platforms like mingw: no ttys exist at all.  */
+  return ENOTTY;
+#endif
+}
diff --git a/lib/unistd.in.h b/lib/unistd.in.h
index b74484a883..c1732b8426 100644
--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -1099,6 +1099,25 @@ _GL_WARN_ON_USE (symlinkat, "symlinkat is not portable - "
 #endif
 
 
+#if @GNULIB_TTYNAME_R@
+/* Store at most BUFLEN characters of the pathname of the terminal FD is
+   open on in BUF.  Return 0 on success, otherwise an error number.  */
+# if !@HAVE_TTYNAME_R@
+_GL_FUNCDECL_SYS (ttyname_r, int,
+                  (int fd, char *buf, size_t buflen) _GL_ARG_NONNULL ((2)));
+# endif
+_GL_CXXALIAS_SYS (ttyname_r, int,
+                  (int fd, char *buf, size_t buflen));
+_GL_CXXALIASWARN (ttyname_r);
+#elif defined GNULIB_POSIXCHECK
+# undef ttyname_r
+# if HAVE_RAW_DECL_TTYNAME_R
+_GL_WARN_ON_USE (ttyname_r, "ttyname_r is not portable - "
+                 "use gnulib module ttyname_r for portability");
+# endif
+#endif
+
+
 #if @GNULIB_UNLINK@
 # if @REPLACE_UNLINK@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)