* cygwin.din: Remove some _tc* exports. Add tcgetsid().

* dtable.cc (fh_alloc): Revert ill-advised setting of major/minor.  Use new
is_dev_tty to remember that this device was opened as /dev/tty.
* fhandler.cc (fhandler_base::fstat): Remove leftover debugging statement.
(fhandler_base::tcgetsid): New function.
* fhandler.h ((fhandler_base::tcgetsid): Declare new function.
(fhandler_base::is_dev_tty): Ditto.
(fhandler_termios::opened_as_dev_tty): Declare new field.
(fhandler_termios::is_dev_tty): Declare new function.
(fhandler_termios::tcgetsid): Ditto.
(fhandler_pty_common::use_archetype): Move here from subclass.
(fhandler_pty_slave::use_archetype): Move up.
(fhandler_pty_master::use_archetype): Ditto.
* fhandler_console.cc (fhandler_console::ioctl): Rename second argument from
`buf' to `arg' for consistency.  Call ioctl_termios for common fhandler_termios
ioctl handling.
* fhandler_tty.cc (fhandler_pty_slave::ioctl): Call ioctl_termios for common
fhandler_termios ioctl handling.
(fhandler_pty_master::ioctl): Ditto.
* fhandler_termios.cc (fhandler_termios::tcgetsid): Implement new function.
(fhandler_termios::ioctl_termios): Ditto.  Implements TIOCSCTTY handling.
* syscalls.cc (stat_worker): Set /dev/tty device info when appropriate.
* termios.cc (tcgetpgrp): Avoid extraneous "isatty" check.
(tcgetsid): Implement new function.
* include/cygwin/version.h: Bump CYGWIN_VERSION_API_MINOR to 253.
* include/sys/termios.h (TIOCSCTTY): Define.

1 files changed, 34 insertions, 0 deletions

diff --git a/winsup/cygwin/fhandler_termios.cc b/winsup/cygwin/fhandler_termios.cc
index 9ea6ae9d8..4575ede94 100644
--- a/winsup/cygwin/fhandler_termios.cc
+++ b/winsup/cygwin/fhandler_termios.cc
@@ -400,3 +400,37 @@ fhandler_termios::sigflush ()
   if (get_ttyp () && !(get_ttyp ()->ti.c_lflag & NOFLSH))
     tcflush (TCIFLUSH);
 }
+
+int
+fhandler_termios::tcgetsid ()
+{
+  if (myself->ctty != -1 && myself->ctty == tc ()->ntty)
+    return tc ()->getsid ();
+  set_errno (ENOTTY);
+  return -1;
+}
+
+int
+fhandler_termios::ioctl_termios (int cmd, int arg)
+{
+  if (cmd != TIOCSCTTY)
+    return 1;		/* Not handled by this function */
+
+  if (arg != 0 && arg != 1)
+    {
+      set_errno (EINVAL);
+      return -1;
+    }
+
+  termios_printf ("myself->ctty %d, myself->sid %d, myself->pid %d, arg %d, tc()->getsid () %d\n",
+		  myself->ctty, myself->sid, myself->pid, arg, tc ()->getsid ());
+  if (myself->ctty > 0 || myself->sid != myself->pid || (!arg && tc ()->getsid () > 0))
+    {
+      set_errno (EPERM);
+      return -1;
+    }
+
+  myself->ctty = -1;
+  myself->set_ctty (tc (), 0, this);
+  return 0;
+}