A few more bugfixes and new features.
(Sigh.) I obviously need to remember to separate individual changes to multiple commits. src/emacsclient.c: Improved error handling. (decode_options): Changed frame option (again) from -f to -t. (print_help_and_exit): Ditto. (copy_from_to): Check EINTR after write, not EAGAIN. Removed SIGIO hack. (pty_conversation): Handle errors transmitted through the socket. Handle pty errors by not reading from it anymore. (main): Restore correct errno after socket_status failed. Send -tty on -t, not -pty. lisp/server.el (server-process-filter): Watch -tty, not -pty. Use make-frame-on-tty instead of make-terminal-frame. Don't set newframe to t if make-frame-on-tty failed. Don't delete frames here. Print correct message when there are no files to edit, but a new frame was requested. (server-sentinel): Delete the frame after the process. (server-handle-delete-frame): New function for delete-frame-functions. (server-start): Add server-handle-delete-frame to delete-frame-functions. (server-buffer-done): Don't delete frames here. src/alloc.c (mark_ttys): Add prototype. (Fgarbage_collect): Call mark_ttys. src/emacs.c: (shut_down_emacs): Don't flush stdout before reset_sys_modes(). src/process.c (add_keyboard_wait_descriptor_called_flag): Removed. (add_keyboard_wait_descriptor): Removed stdin hack. src/sysdep.c: Unconditionally include sysselect.h. (old_fcntl_flags): Changed to an array. (init_sigio, reset_sigio): Use it. (narrow_foreground_group, widen_foreground_group): Use setpgid, not setpgrp. (old_fcntl_owner): Changed to an array. (init_sys_modes, reset_sys_modes): Use it. Fix fsync() and reset_sigio() calls. src/term.c (Qframe_tty_name, Qframe_tty_type): New variables. (syms_of_term): Initialize them. (Fframe_tty_name, Fframe_tty_type): New functions. (term_init): Call add_keyboard_wait_descriptor(). (Fdelete_tty): New function. (delete_tty): Call delete_keyboard_wait_descriptor(). (get_current_tty): Removed. (mark_ttys): New function. git-archimport-id: firstname.lastname@example.org/emacs--multi-tty--0--patch-28
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