[newlib-cygwin] Cygwin: console: Fix tcsetattr which was broken sinse cygwin 3.5.5

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=4b5dcf27c7f0eb15e8092f9e7fdc901c370cdea8

commit 4b5dcf27c7f0eb15e8092f9e7fdc901c370cdea8
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Tue Apr 8 12:38:31 2025 +0900

    Cygwin: console: Fix tcsetattr which was broken sinse cygwin 3.5.5
    
    After the commit 84d77e5918e1 ("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: 84d77e5918e1 ("Cygwin: console: Disable cons_master_thread in win32-input-mode")
    Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>

Diff:
---
 winsup/cygwin/fhandler/console.cc | 2 ++
 winsup/cygwin/release/3.6.1       | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/winsup/cygwin/fhandler/console.cc b/winsup/cygwin/fhandler/console.cc
index f162698a8..a38487f9b 100644
--- a/winsup/cygwin/fhandler/console.cc
+++ b/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;
 }
 
diff --git a/winsup/cygwin/release/3.6.1 b/winsup/cygwin/release/3.6.1
index 280952c91..e1bdd1727 100644
--- a/winsup/cygwin/release/3.6.1
+++ b/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.