New module 'tcgetsid'.

* lib/tcgetsid.c: New file.
* m4/tcgetsid.m4: New file.
* modules/tcgetsid: New file.
* modules/termios (Depends-on): Add c++defs, warn-on-use.
(Makefile.am): Ensure c++defs.h, warn-on-use.h get included. Substitute
GNULIB_TCGETSID, HAVE_TCGETSID.
* lib/termios.in.h: Include <sys/types.h>.
(tcgetsid): New declaration.
* m4/termios_h.m4 (gl_TERMIOS_H): Check whether tcgetsid is declared.
(gl_TERMIOS_H_DEFAULTS): Initialize GNULIB_TCGETSID, HAVE_TCGETSID.
* doc/posix-functions/tcgetsid.texi: Mention the new module.
* tests/test-termios-c++.cc: Check GNULIB_NAMESPACE::tcgetsid.

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/tcgetsid.c b/lib/tcgetsid.c
new file mode 100644
index 0000000000..3bf91c84ec
--- /dev/null
+++ b/lib/tcgetsid.c
@@ -0,0 +1,42 @@
+/* Determine the session ID of the controlling terminal of the current process.
+   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 2, 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+#define USE_OLD_TTY /* needed on OpenBSD 4.5, so that TIOCGSID gets defined */
+
+/* Specification.  */
+#include <termios.h>
+
+#include <errno.h>
+#include <sys/ioctl.h>
+
+pid_t
+tcgetsid (int fd)
+{
+#ifdef TIOCGSID /* MacOS X, OpenBSD */
+  int sid;
+
+  if (ioctl (fd, TIOCGSID, &sid) < 0)
+    return -1; /* errno is set here */
+
+  return sid;
+#else /* FreeBSD, Cygwin, mingw */
+  errno = ENOSYS;
+  return -1;
+#endif
+}