posix_openpt: new module

* modules/posix_openpt: New module.
* m4/posix_openpt.m4: New file.
* lib/posix_openpt.c: Likewise.
* m4/stdlib_h.m4 (gl_STDLIB_H): Check for decl.
(gl_STDLIB_H_DEFAULTS): Set defaults.
* modules/stdlib (Makefile.am): Substitute macros.
* lib/stdlib.in.h (posix_openpt): Declare.
* MODULES.html.sh (systems lacking POSIX:2008): Document it.
* doc/posix-functions/posix_openpt.texi (posix_openpt): Likewise.
* modules/posix_openpt-tests: New test module.
* tests/test-posix_openpt.c: New test.

1 files changed, 50 insertions, 0 deletions

diff --git a/lib/posix_openpt.c b/lib/posix_openpt.c
new file mode 100644
index 0000000000..b2e4999c29
--- /dev/null
+++ b/lib/posix_openpt.c
@@ -0,0 +1,50 @@
+/* Open the master side of a pseudo-terminal.
+   Copyright (C) 2010-2011 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/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <stdlib.h>
+
+#include <fcntl.h>
+#include <errno.h>
+
+int
+posix_openpty (int flags)
+{
+  int master;
+
+#ifdef _AIX /* AIX */
+
+  master = open ("/dev/ptc", flags);
+
+#elif (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__ /* mingw */
+
+  /* Mingw lacks pseudo-terminals altogether.  */
+  master = -1;
+  errno = ENOSYS;
+
+#else /* MacOS, OpenBSD, HP-UX, IRIX, Solaris 9, Cygwin 1.5 */
+
+  /* Most systems that lack posix_openpt() have /dev/ptmx.  */
+  master = open ("/dev/ptmx", flags);
+
+#endif
+
+  return master;
+}
+
+#endif