Subject: bug#1058: 23.0.60; emacs --daemon should not return until socket is ready

From: Dan Nicolaescu <[email-masked]>
Date: Sun, 12 Oct 2008 19:03:40 -0700 (PDT)

Here's a patch that adds support for --daemon=SERVER_NAME
Using --daemon=SERVER_NAME for scripts is much nicer than: 
--daemon --eval '(setq server-name "SERVER_NAME")' 
So IMVHO something like this could go in now...

Index: lisp/server.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/server.el,v
retrieving revision 1.168
diff -u -3 -p -r1.168 server.el
--- lisp/server.el	24 Sep 2008 20:12:02 -0000	1.168
+++ lisp/server.el	13 Oct 2008 00:15:28 -0000
@@ -446,7 +446,7 @@ Creates the directory if necessary and m
       (error "The directory %s is unsafe" dir))))
 
 ;;;###autoload
-(defun server-start (&optional leave-dead)
+(defun server-start (&optional leave-dead server-arg)
   "Allow this Emacs process to be a server for client processes.
 This starts a server communications subprocess through which
 client \"editors\" can send your editing commands to this Emacs
@@ -463,6 +463,8 @@ kill any existing server communications 
     (when server-process
       ;; kill it dead!
       (ignore-errors (delete-process server-process)))
+    (when (stringp server-arg)
+      (setq server-name server-arg))
     ;; Delete the socket files made by previous server invocations.
     (condition-case ()
 	(delete-file (expand-file-name server-name server-socket-dir))
Index: lisp/startup.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/startup.el,v
retrieving revision 1.513
diff -u -3 -p -r1.513 startup.el
--- lisp/startup.el	12 Oct 2008 16:59:01 -0000	1.513
+++ lisp/startup.el	13 Oct 2008 00:15:28 -0000
@@ -1212,8 +1212,8 @@ the `--debug-init' option to view a comp
   ;; This is done after loading the user's init file and after
   ;; processing all command line arguments to allow e.g. `server-name'
   ;; to be changed before the server starts.
-  (when (daemonp)
-    (server-start))
+  (let ((dn (daemonp)))
+    (when dn (server-start nil dn)))
 
   ;; Run emacs-session-restore (session management) if started by
   ;; the session manager and we have a session manager connection.
Index: src/emacs.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/emacs.c,v
retrieving revision 1.448
diff -u -3 -p -r1.448 emacs.c
--- src/emacs.c	6 Oct 2008 16:16:56 -0000	1.448
+++ src/emacs.c	13 Oct 2008 00:15:28 -0000
@@ -237,6 +237,8 @@ int noninteractive1;
 
 /* Nonzero means Emacs was started as a daemon.  */
 int is_daemon = 0;
+/* Name for the server started by the daemon.*/
+static char *daemon_name;
 
 /* Save argv and argc.  */
 char **initial_argv;
@@ -792,6 +794,7 @@ main (int argc, char **argv)
 #endif
   int no_loadup = 0;
   char *junk = 0;
+  char *dname_arg = 0;
 
 #if GC_MARK_STACK
   extern Lisp_Object *stack_base;
@@ -1074,8 +1077,8 @@ main (int argc, char **argv)
       printf (USAGE4, bug_reporting_address ());
       exit (0);
     }
-
-  if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args))
+  if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
+      || argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
     {
 #ifndef DOS_NT
       pid_t f = fork ();
@@ -1088,6 +1091,8 @@ main (int argc, char **argv)
 	  exit (1);
 	}
 
+      if (dname_arg)
+      	daemon_name = xstrdup (dname_arg);
       nfd = open ("/dev/null", O_RDWR);
       dup2 (nfd, 0);
       dup2 (nfd, 1);
@@ -2387,10 +2392,17 @@ decode_env_path (evarname, defalt)
 }
 
 DEFUN ("daemonp", Fdaemonp, Sdaemonp, 0, 0, 0,
-       doc: /* Return t if the current emacs process is a daemon.  */)
+       doc: /* Return non-nil if the current emacs process is a daemon.
+If the daemon was give a name argument, return that name. */)
   ()
 {
-  return is_daemon ? Qt : Qnil;
+  if (is_daemon)
+    if (daemon_name)
+      return build_string (daemon_name);
+    else
+      return Qt;
+  else
+    return Qnil;
 }
 
 void