@c -*-texinfo-*-
@c This is part of the GNU Emacs Lisp Reference Manual.
@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2001,
-@c 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+@c 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+@c Free Software Foundation, Inc.
@c See the file elisp.texi for copying conditions.
@setfilename ../../info/processes
@node Processes, Display, Abbrevs, Top
* Sentinels:: Sentinels run when process run-status changes.
* Query Before Exit:: Whether to query if exiting will kill a process.
* System Processes:: Accessing other processes running on your system.
-* Transaction Queues:: Transaction-based communication with subprocesses.
+* Transaction Queues:: Transaction-based communication with subprocesses.
* Network:: Opening network connections.
* Network Servers:: Network servers let Emacs accept net connections.
* Datagrams:: UDP network connections.
* Low-Level Network:: Lower-level but more general function
to create connections and servers.
-* Misc Network:: Additional relevant functions for network connections.
+* Misc Network:: Additional relevant functions for net connections.
* Serial Ports:: Communicating with serial ports.
* Byte Packing:: Using bindat to pack and unpack binary data.
@end menu
This function returns the terminal name that @var{process} is using for
its communication with Emacs---or @code{nil} if it is using pipes
instead of a terminal (see @code{process-connection-type} in
-@ref{Asynchronous Processes}).
+@ref{Asynchronous Processes}). If @var{process} represents a program
+running on a remote host, the terminal name used by that program on
+the remote host is provided as process property @code{remote-tty}.
@end defun
@defun process-coding-system process
filter. Such filter functions need to use @code{set-buffer} in order to
be sure to insert in that buffer. To avoid setting the current buffer
semipermanently, these filter functions must save and restore the
-current buffer. They should also update the process marker, and in some
-cases update the value of point. Here is how to do these things:
+current buffer. They should also check whether the buffer is still
+alive, update the process marker, and in some cases update the value
+of point. Here is how to do these things:
@smallexample
@group
(defun ordinary-insertion-filter (proc string)
- (with-current-buffer (process-buffer proc)
- (let ((moving (= (point) (process-mark proc))))
+ (when (buffer-live-p (process-buffer proc))
+ (with-current-buffer (process-buffer proc)
+ (let ((moving (= (point) (process-mark proc))))
@end group
@group
- (save-excursion
- ;; @r{Insert the text, advancing the process marker.}
- (goto-char (process-mark proc))
- (insert string)
- (set-marker (process-mark proc) (point)))
- (if moving (goto-char (process-mark proc))))))
+ (save-excursion
+ ;; @r{Insert the text, advancing the process marker.}
+ (goto-char (process-mark proc))
+ (insert string)
+ (set-marker (process-mark proc) (point)))
+ (if moving (goto-char (process-mark proc)))))))
@end group
@end smallexample
match data. Now Emacs does this automatically for filter functions;
they never need to do it explicitly. @xref{Match Data}.
- A filter function that writes the output into the buffer of the
-process should check whether the buffer is still alive. If it tries to
-insert into a dead buffer, it will get an error. The expression
-@code{(buffer-name (process-buffer @var{process}))} returns @code{nil}
-if the buffer is dead.
-
The output to the function may come in chunks of any size. A program
that produces the same output twice in a row may send it as one batch of
200 characters one time, and five batches of 40 characters the next. If
@item :type @var{type}
Specify the communication type. A value of @code{nil} specifies a
stream connection (the default); @code{datagram} specifies a datagram
-connection. Both connections and servers can be of either type.
+connection; @code{seqpacket} specifies a ``sequenced packet stream''
+connection. Both connections and servers can be of these types.
@item :server @var{server-flag}
If @var{server-flag} is non-@code{nil}, create a server. Otherwise,