Cygwin: console: Fix tcsetattr which was broken sinse cygwin 3.5.5

After the commit 84d77e5 ("Cygwin: console: Disable
cons_master_thread in win32-input-mode") tcsetattr() no longer takes
effect for the console. This occurs because set_input_mode() and
set_output_mode() are now called in bg_check() only when the current
mode is not tty::cygwin. Before this commit, these functions were
always invoked in bg_check(), regardless of whether the current mode
was already tty::cygwin. As a result, the console mode was updated
every time read() or write() was called.

With this patch, set_input_mode() and set_output_mode() are called
in tcsetattr() to make it take effect.

Fixes: 84d77e5 ("Cygwin: console: Disable cons_master_thread in win32-input-mode")
Signed-off-by: Takashi Yano <[email protected]>
(cherry picked from commit 4b5dcf2)

Author: tyan0

winsup/cygwin/fhandler/console.cc

@@ -2215,6 +2215,8 @@ int
 fhandler_console::tcsetattr (int a, struct termios const *t)
 {
   get_ttyp ()->ti = *t;
+  set_input_mode (tty::cygwin, t, &handle_set);
+  set_output_mode (tty::cygwin, t, &handle_set);
   return 0;
 }
 

winsup/cygwin/release/3.6.1

@@ -39,3 +39,5 @@ Fixes:
 
 - Don't increment DLL reference count in dladdr.
   Addresses: https://cygwin.com/pipermail/cygwin/2025-April/257862.html
+
+- Fix tcsetattr() for console which has been broken sinse cygwin 3.5.5.