From: Romain Francoise <romain@orebokech.com>
To: Dan Nicolaescu <dann@ics.uci.edu>
Cc: trentbuck@gmail.com, 1058@emacsbugs.donarmstrong.com
Subject: bug#1058: 23.0.60; emacs --daemon should not return until socket is ready
Date: Wed, 01 Oct 2008 21:39:40 +0200 [thread overview]
Message-ID: <87k5csds03.fsf@elegiac.orebokech.com> (raw)
In-Reply-To: <200810011651.m91GpAZQ010333@mothra.ics.uci.edu> (Dan Nicolaescu's message of "Wed, 1 Oct 2008 09:51:10 -0700 (PDT)")
Hi Dan, Trent,
Dan Nicolaescu <dann@ics.uci.edu> writes:
> Just curious, what do you get if you do:
> emacs -Q --daemon; while ! ls /tmp/emacs1187/; do sleep 1; done
Yes, the delay is caused by my change to load the init file before
starting the server.
> Unfortunately ATM I don't see an easy way to do that.
> Ideas/patches are certainly welcome.
It's easy to do, but not very clean. WDYT?
diff --git a/lisp/startup.el b/lisp/startup.el
index 5bd73f9..d9e37be 100644
--- a/lisp/startup.el
+++ b/lisp/startup.el
@@ -1224,7 +1224,8 @@ opening the first frame (e.g. open a connection to an X server).")
;; processing all command line arguments to allow e.g. `server-name'
;; to be changed before the server starts.
(when (daemonp)
- (server-start))
+ (server-start)
+ (daemon-detach-parent))
;; Run emacs-session-restore (session management) if started by
;; the session manager and we have a session manager connection.
diff --git a/src/emacs.c b/src/emacs.c
index f94d2d3..a2842d4 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -235,6 +235,10 @@ int noninteractive1;
/* Nonzero means Emacs was started as a daemon. */
int is_daemon = 0;
+/* Pipe used to send exit notification to the daemon parent at
+ startup. */
+int daemon_pipe[2];
+
/* Save argv and argc. */
char **initial_argv;
int initial_argc;
@@ -1074,16 +1078,31 @@ main (int argc, char **argv)
if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args))
{
#ifndef DOS_NT
+ if (pipe (daemon_pipe) == -1)
+ {
+ fprintf (stderr, "Cannot pipe!\n");
+ exit (1);
+ }
pid_t f = fork ();
int nfd;
if (f > 0)
- exit (0);
+ {
+ char buf[2];
+ close (daemon_pipe[1]);
+ /* Wait for the child to close its end of the pipe before
+ exiting. */
+ while (read (daemon_pipe[0], &buf, 1) < 0)
+ sleep (0.1);
+ close (daemon_pipe[0]);
+ exit (0);
+ }
if (f < 0)
{
fprintf (stderr, "Cannot fork!\n");
exit (1);
}
+ close (daemon_pipe[0]);
nfd = open ("/dev/null", O_RDWR);
dup2 (nfd, 0);
dup2 (nfd, 1);
@@ -2389,6 +2408,16 @@ DEFUN ("daemonp", Fdaemonp, Sdaemonp, 0, 0, 0,
return is_daemon ? Qt : Qnil;
}
+DEFUN ("daemon-detach-parent", Fdaemon_detach_parent, Sdaemon_detach_parent,
+ 0, 0, 0,
+ doc: /* Detach Emacs from its invocation parent if it was started as a daemon. */)
+ ()
+{
+ if (is_daemon)
+ close (daemon_pipe[1]);
+ return Qt;
+}
+
void
syms_of_emacs ()
{
@@ -2408,6 +2437,7 @@ syms_of_emacs ()
defsubr (&Sinvocation_name);
defsubr (&Sinvocation_directory);
defsubr (&Sdaemonp);
+ defsubr (&Sdaemon_detach_parent);
DEFVAR_LISP ("command-line-args", &Vcommand_line_args,
doc: /* Args passed by shell to Emacs, as a list of strings.
next prev parent reply other threads:[~2008-10-01 19:39 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-30 13:43 bug#1058: 23.0.60; emacs --daemon should not return until socket is ready SRS0+wOMF+22+gmail.com=trentbuck
2008-10-01 16:51 ` Dan Nicolaescu
2008-10-01 19:39 ` Romain Francoise [this message]
2008-10-01 20:19 ` Andreas Schwab
2008-10-02 6:05 ` Romain Francoise
2008-10-01 23:32 ` Dan Nicolaescu
2008-10-02 6:07 ` Romain Francoise
2008-10-02 8:14 ` Dan Nicolaescu
2008-10-02 12:38 ` Stefan Monnier
2008-10-02 17:26 ` Dan Nicolaescu
2008-10-02 21:32 ` Stefan Monnier
2008-10-02 22:34 ` Dan Nicolaescu
2008-10-02 22:46 ` Trent W. Buck
2008-10-03 1:12 ` Stefan Monnier
2008-10-03 4:52 ` Dan Nicolaescu
2008-10-03 13:00 ` Stefan Monnier
2008-10-03 17:44 ` Dan Nicolaescu
2008-10-13 2:03 ` Dan Nicolaescu
2008-10-13 15:16 ` Stefan Monnier
2008-10-13 17:01 ` Dan Nicolaescu
2008-10-13 19:07 ` Stefan Monnier
2008-10-14 7:26 ` Dan Nicolaescu
2008-10-27 7:04 ` Dan Nicolaescu
2008-10-02 22:42 ` Trent W. Buck
2008-10-02 17:54 ` Romain Francoise
2008-10-02 18:40 ` Dan Nicolaescu
2008-10-06 20:59 ` Dan Nicolaescu
2008-10-07 14:26 ` Stefan Monnier
2008-10-07 15:31 ` Dan Nicolaescu
2008-10-07 23:13 ` Trent W. Buck
2008-10-08 2:03 ` Stefan Monnier
2008-10-08 2:25 ` Stefan Monnier
2008-10-07 18:45 ` Romain Francoise
2008-10-07 19:01 ` Dan Nicolaescu
2008-10-26 19:24 ` Dan Nicolaescu
2008-10-02 0:50 ` Trent W. Buck
2008-10-02 0:43 ` Trent W. Buck
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