Implemented suspending of emacsclient frames.

lib-src/emacsclient.c (quote_file_name): Renamed to quote_argument.
(unquote_argument, handle_sigcont, handle_sigtstp): New functions.
(out, in): New global variables for communicating with the Emacs process.
(init_signals): Set up handlers for SIGCONT, SIGTSTP and SIGTTOU.
(main): Changed out and in to global variables.  Prepend `-eval' or
'-file' to each argument.  Use fsync to force sending the strings to Emacs.
Removed obsolete -bad-version code.  Support the -suspend command.
Cleaned up newline handling.

lisp/frame.el (suspend-frame): New function.
Substitute key definition of suspend-emacs with suspend-frame.

lisp/server.el (server-log): Cosmetic change in log format.
(server-handle-delete-tty, server-handle-delete-frame): Added logging.
(server-handle-suspend-tty, server-quote-arg): New functions.
(server-start): Install server-handle-suspend-tty.
(server-process-filter): Reorganized source code for clarity.
Implemented -resume, -suspend and -ignore commands.

lisp/term/x-win.el (x-initialize-window-system): Don't change the
binding of C-z.

src/cm.c: Replaced TTY_INPUT, TTY_OUTPUT, TTY_TERMSCRIPT calls with
their macro expansion.
src/dispnew.c: Ditto.
src/frame.c: Ditto.
src/keyboard.c: Ditto.
src/sysdep.c: Ditto.

src/keyboard.c (tty_read_avail_input): Don't read if the terminal is
suspended.
src/sysdep.c (discard_tty_input, init_sys_modes, reset_sys_modes): Ditto.
src/term.c (tty_set_terminal_modes, tty_reset_terminal_modes): Ditto.

src/term.c (Vsuspend_tty_functions, Vresume_tty_functions): New hooks.
(syms_of_term): Defvar them.
(term_init): Don't allow opening a new frame on a suspended tty device.
(Fsuspend_tty, Fresume_tty): New functions.
(syms_of_term): Defsubr them.

src/termchar.c (struct tty_display_info): Update documentation of
input and output.
(TTY_INPUT, TTY_OUTPUT, TTY_TERMSCRIPT): Removed.


git-archimport-id: lorentey@elte.hu--2004/emacs--multi-tty--0--patch-105

1 files changed, 48 insertions, 9 deletions

diff --git a/README.multi-tty b/README.multi-tty
index 68cae7a2060..43dfdcbc91f 100644
--- a/README.multi-tty
+++ b/README.multi-tty
@@ -200,22 +200,50 @@ THINGS TO DO
    argument-handling is done in Lisp, so this should be quite easy to
    implement.
 
-** Very strange bug: visible-bell does not work on secondary
-   terminals.  This might be something xterm (konsole) specific.
+** Make `struct display' accessible to Lisp programs.  Accessor functions:
 
-** Find out the best way to support suspending Emacs with multiple
-   ttys.  My guess: disable it on the controlling tty, but from other
-   ttys pass it on to emacsclient somehow.  (It is (I hope) trivial to
-   extend emacsclient to handle suspend/resume.  A `kill -STOP' almost
-   works right now.)
+        (displayp OBJECT):  Returns t if OBJECT is a display.
 
-** Clean up the frame-local variable system.  I think it's ugly and
-   error-prone.  But maybe I just haven't yet fully understood it.
+        (selected-display):  Returns the display object of the selected frame.
+
+        (frame-display FRAME):  Returns the display object of FRAME.
+
+        (display-frames DISPLAY):  Returns a list of frames on DISPLAY.
+
+        (display-type DISPLAY):  Returns the type of DISPLAY, as a
+                symbol.  (See `framep'.)
+
+        (display-device DISPLAY): Returns the name of the device that
+                DISPLAY uses, as a string.  (E.g: "/dev/pts/16", or
+                ":0.0")
+
+   See next issue why this is necessary.
+
+** The following needs to be supported:
+
+        $ emacsclient -t
+                C-z
+        $ bg
+        $ emacsclient -t
+                (This fails now.)
+
+   The cleanest way to solve this is to allow multiple displays on the
+   same terminal device; each new emacsclient process should create
+   its own display.  As displays are currently identified by their
+   device names, this is not possible until struct display becomes
+   accessible as a Lisp-level object.
 
 ** Add an elaborate mechanism for display-local variables.  (There are
    already a few of these; search for `terminal-local' in the Elisp
    manual.)
 
+** Very strange bug: visible-bell does not work on secondary
+   terminals in xterm and konsole.  The screen does flicker a bit,
+   but it's so quick it isn't noticable.
+
+** Clean up the frame-local variable system.  I think it's ugly and
+   error-prone.  But maybe I just haven't yet fully understood it.
+
 ** Move baud_rate to struct display.
 
 ** Implement support for starting an interactive Emacs session without
@@ -667,4 +695,15 @@ DIARY OF CHANGES
    complaints seem to be caused by bugs in term.el; they are not
    related to multi-tty.)
 
+-- Find out the best way to support suspending Emacs with multiple
+   ttys.  My guess: disable it on the controlling tty, but from other
+   ttys pass it on to emacsclient somehow.  (It is (I hope) trivial to
+   extend emacsclient to handle suspend/resume.  A `kill -STOP' almost
+   works right now.)
+
+   (Done.  I needed to play with signal handling and the server
+   protocol a bit to make emacsclient behave as a normal UNIX program
+   wrt foreground/background process groups.)
+
+
 ;;; arch-tag: 8da1619e-2e79-41a8-9ac9-a0485daad17d