Fix implementation of the --terminal command-line switch

It sounds like this has been broken ever since multi-tty was
added to Emacs.
* src/keyboard.c (dev_tty): New global variable.
* src/keyboard.h: Declare 'dev_tty'.
* src/emacs.c (main): Initialize 'dev_tty'.
* src/term.c (Fcontrolling_tty_p, Fresume_tty, init_tty):
* src/process.c (dissociate_controlling_tty):
* src/keyboard.c (handle_interrupt_signal, handle_interrupt)
(Fset_quit_char): Use 'dev_tty' instead of 'DEV_TTY'.  (Bug#70519)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index 6b8b483cdf7..50d1968200d 100644
--- a/src/process.c
+++ b/src/process.c
@@ -2114,7 +2114,7 @@ dissociate_controlling_tty (void)
          child that has not execed.
          I wonder: would just ioctl (fd, TIOCNOTTY, 0) work here, for
          some fd that the caller already has?  */
-      int ttyfd = emacs_open (DEV_TTY, O_RDWR, 0);
+      int ttyfd = emacs_open (dev_tty, O_RDWR, 0);
       if (0 <= ttyfd)
         {
           ioctl (ttyfd, TIOCNOTTY, 0);