/* Fully extensible Emacs, running on Unix, intended for GNU.
Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1997, 1998, 1999,
- 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GNU Emacs.
int display_arg;
#endif
+#ifdef HAVE_NS
+extern char ns_no_defaults;
+#endif
+
/* An address near the bottom of the stack.
Tells GC how to save a copy of the stack. */
char *stack_bottom;
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;
+
+/* Pipe used to send exit notification to the daemon parent at
+ startup. */
+int daemon_pipe[2];
/* Save argv and argc. */
char **initial_argv;
Action options:\n\
\n\
FILE visit FILE using find-file\n\
-+LINE go to line LINE in next FILE\n\
-+LINE:COLUMN go to line LINE, column COLUMN, in next FILE\n\
++LINE go to line LINE in next FILE\n\
++LINE:COLUMN go to line LINE, column COLUMN, in next FILE\n\
--directory, -L DIR add DIR to variable load-path\n\
--eval EXPR evaluate Emacs Lisp expression EXPR\n\
--execute EXPR evaluate Emacs Lisp expression EXPR\n\
#endif
int no_loadup = 0;
char *junk = 0;
+ char *dname_arg = 0;
+#ifdef NS_IMPL_COCOA
+ char dname_arg2[80];
+#endif
#if GC_MARK_STACK
extern Lisp_Object *stack_base;
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 ();
- int nfd;
+ pid_t f;
+
+ /* Start as a daemon: fork a new child process which will run the
+ rest of the initialization code, then exit.
+
+ Detaching a daemon requires the following steps:
+ - fork
+ - setsid
+ - exit the parent
+ - close the tty file-descriptors
+
+ We only want to do the last 2 steps once the daemon is ready to
+ serve requests, i.e. after loading .emacs (initialization).
+ OTOH initialization may start subprocesses (e.g. ispell) and these
+ should be run from the proper process (the one that will end up
+ running as daemon) and with the proper "session id" in order for
+ them to keep working after detaching, so fork and setsid need to be
+ performed before initialization.
+
+ We want to avoid exiting before the server socket is ready, so
+ use a pipe for synchronization. The parent waits for the child
+ to close its end of the pipe (using `daemon-initialized')
+ before exiting. */
+ if (pipe (daemon_pipe) == -1)
+ {
+ fprintf (stderr, "Cannot pipe!\n");
+ exit (1);
+ }
+
+#ifndef NS_IMPL_COCOA
+ f = fork ();
+#else /* NS_IMPL_COCOA */
+ /* Under Cocoa we must do fork+exec as CoreFoundation lib fails in
+ forked process: http://developer.apple.com/ReleaseNotes/
+ CoreFoundation/CoreFoundation.html)
+ We mark being in the exec'd process by a daemon name argument of
+ form "--daemon=\nFD0,FD1\nNAME" where FD are the pipe file descriptors,
+ NAME is the original daemon name, if any. */
+ if (!dname_arg || !strchr (dname_arg, '\n'))
+ f = fork (); /* in orig */
+ else
+ f = 0; /* in exec'd */
+#endif /* NS_IMPL_COCOA */
if (f > 0)
- exit (0);
+ {
+ int retval;
+ char buf[1];
+
+ /* Close unused writing end of the pipe. */
+ close (daemon_pipe[1]);
+
+ /* Just wait for the child to close its end of the pipe. */
+ do
+ {
+ retval = read (daemon_pipe[0], &buf, 1);
+ }
+ while (retval == -1 && errno == EINTR);
+
+ if (retval < 0)
+ {
+ fprintf (stderr, "Error reading status from child\n");
+ exit (1);
+ }
+ else if (retval == 0)
+ {
+ fprintf (stderr, "Error: server did not start correctly\n");
+ exit (1);
+ }
+
+ close (daemon_pipe[0]);
+ exit (0);
+ }
if (f < 0)
{
fprintf (stderr, "Cannot fork!\n");
exit (1);
}
- nfd = open ("/dev/null", O_RDWR);
- dup2 (nfd, 0);
- dup2 (nfd, 1);
- dup2 (nfd, 2);
- close (nfd);
- is_daemon = 1;
+#ifdef NS_IMPL_COCOA
+ {
+ /* In orig process, forked as child, OR in exec'd. */
+ if (!dname_arg || !strchr (dname_arg, '\n'))
+ { /* In orig, child: now exec w/special daemon name. */
+ char fdStr[80];
+
+ if (dname_arg && strlen (dname_arg) > 70)
+ {
+ fprintf (stderr, "daemon: child name too long\n");
+ exit (1);
+ }
+
+ sprintf (fdStr, "--daemon=\n%d,%d\n%s", daemon_pipe[0],
+ daemon_pipe[1], dname_arg ? dname_arg : "");
+ argv[skip_args] = fdStr;
+
+ execv (argv[0], argv);
+ fprintf (stderr, "emacs daemon: exec failed: %d\t%d\n", errno);
+ exit (1);
+ }
+
+ /* In exec'd: parse special dname into pipe and name info. */
+ if (!dname_arg || !strchr (dname_arg, '\n')
+ || strlen (dname_arg) < 1 || strlen (dname_arg) > 70)
+ {
+ fprintf (stderr, "emacs daemon: daemon name absent or too long\n");
+ exit(1);
+ }
+ dname_arg2[0] = '\0';
+ sscanf (dname_arg, "\n%d,%d\n%s", &(daemon_pipe[0]), &(daemon_pipe[1]),
+ dname_arg2);
+ dname_arg = strlen (dname_arg2) ? dname_arg2 : NULL;
+ }
+#endif /* NS_IMPL_COCOA */
+
+ if (dname_arg)
+ daemon_name = xstrdup (dname_arg);
+ /* Close unused reading end of the pipe. */
+ close (daemon_pipe[0]);
+ /* Make sure that the used end of the pipe is closed on exec, so
+ that it is not accessible to programs started from .emacs. */
+ fcntl (daemon_pipe[1], F_SETFD, FD_CLOEXEC);
+
#ifdef HAVE_SETSID
setsid();
#endif
{
char *tmp;
display_arg = 4;
+ if (argmatch (argv, argc, "-q", "--no-init-file", 6, NULL, &skip_args))
+ {
+ ns_no_defaults = 1;
+ skip_args--;
+ }
+ if (argmatch (argv, argc, "-Q", "--quick", 5, NULL, &skip_args))
+ {
+ ns_no_defaults = 1;
+ skip_args--;
+ }
#ifdef NS_IMPL_COCOA
if (skip_args < argc)
{
}
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 given a name argument, return that name. */)
+ ()
+{
+ if (IS_DAEMON)
+ if (daemon_name)
+ return build_string (daemon_name);
+ else
+ return Qt;
+ else
+ return Qnil;
+}
+
+DEFUN ("daemon-initialized", Fdaemon_initialized, Sdaemon_initialized, 0, 0, 0,
+ doc: /* Mark the Emacs daemon as being initialized.
+This finishes the daemonization process by doing the other half of detaching
+from the parent process and its tty file descriptors. */)
()
{
- return is_daemon ? Qt : Qnil;
+ int nfd;
+
+ if (!IS_DAEMON)
+ error ("This function can only be called if emacs is run as a daemon");
+
+ if (daemon_pipe[1] < 0)
+ error ("The daemon has already been initialized");
+
+ if (NILP (Vafter_init_time))
+ error ("This function can only be called after loading the init files");
+
+ /* Get rid of stdin, stdout and stderr. */
+ nfd = open ("/dev/null", O_RDWR);
+ dup2 (nfd, 0);
+ dup2 (nfd, 1);
+ dup2 (nfd, 2);
+ close (nfd);
+
+ /* Closing the pipe will notify the parent that it can exit.
+ FIXME: In case some other process inherited the pipe, closing it here
+ won't notify the parent because it's still open elsewhere, so we
+ additionally send a byte, just to make sure the parent really exits.
+ Instead, we should probably close the pipe in start-process and
+ call-process to make sure the pipe is never inherited by
+ subprocesses. */
+ write (daemon_pipe[1], "\n", 1);
+ close (daemon_pipe[1]);
+ /* Set it to an invalid value so we know we've already run this function. */
+ daemon_pipe[1] = -1;
+ return Qt;
}
void
defsubr (&Sinvocation_name);
defsubr (&Sinvocation_directory);
defsubr (&Sdaemonp);
+ defsubr (&Sdaemon_initialized);
DEFVAR_LISP ("command-line-args", &Vcommand_line_args,
doc: /* Args passed by shell to Emacs, as a list of strings.
doc: /* Value of `current-time' after loading the init files.
This is nil during initialization. */);
Vafter_init_time = Qnil;
+
+ /* Make sure IS_DAEMON starts up as false. */
+ daemon_pipe[1] = 0;
}
/* arch-tag: 7bfd356a-c720-4612-8ab6-aa4222931c2e
HCoop / bpt / emacs.git / blobdiff