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/* Fully extensible Emacs, running on Unix, intended for GNU.
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Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1997, 1998, 1999,
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2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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#ifdef HAVE_PERSONALITY_LINUX32
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/* See if there is a gap between the end of BSS and the heap.
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In that case, set personality and exec ourself again. */
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&& (strcmp (argv[argc-1], "dump") == 0
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|| strcmp (argv[argc-1], "bootstrap") == 0)
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&& heap_bss_diff > MAX_HEAP_BSS_DIFF)
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&& ! getenv ("EMACS_HEAP_EXEC"))
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if (! getenv ("EMACS_HEAP_EXEC"))
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/* Set this so we only do this once. */
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putenv("EMACS_HEAP_EXEC=true");
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/* Set this so we only do this once. */
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putenv("EMACS_HEAP_EXEC=true");
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/* A flag to turn off address randomization which is introduced
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in linux kernel shipped with fedora core 4 */
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/* A flag to turn off address randomization which is introduced
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in linux kernel shipped with fedora core 4 */
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#define ADD_NO_RANDOMIZE 0x0040000
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personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
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personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
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#undef ADD_NO_RANDOMIZE
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execvp (argv[0], argv);
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execvp (argv[0], argv);
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/* If the exec fails, try to dump anyway. */
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/* If the exec fails, try to dump anyway. */
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#endif /* HAVE_PERSONALITY_LINUX32 */
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if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args))
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if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
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|| argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
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/* Start as a daemon: fork a new child process which will run the
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rest of the initialization code, then exit.
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Detaching a daemon requires the following steps:
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- close the tty file-descriptors
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We only want to do the last 2 steps once the daemon is ready to
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serve requests, i.e. after loading .emacs (initialization).
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OTOH initialization may start subprocesses (e.g. ispell) and these
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should be run from the proper process (the one that will end up
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running as daemon) and with the proper "session id" in order for
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them to keep working after detaching, so fork and setsid need to be
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performed before initialization.
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We want to avoid exiting before the server socket is ready, so
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use a pipe for synchronization. The parent waits for the child
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to close its end of the pipe (using `daemon-initialized')
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if (pipe (daemon_pipe) == -1)
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fprintf (stderr, "Cannot pipe!\n");
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#ifndef NS_IMPL_COCOA
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#else /* NS_IMPL_COCOA */
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/* Under Cocoa we must do fork+exec as CoreFoundation lib fails in
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forked process: http://developer.apple.com/ReleaseNotes/
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CoreFoundation/CoreFoundation.html)
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We mark being in the exec'd process by a daemon name argument of
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form "--daemon=\nFD0,FD1\nNAME" where FD are the pipe file descriptors,
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NAME is the original daemon name, if any. */
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if (!dname_arg || !strchr (dname_arg, '\n'))
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f = fork (); /* in orig */
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f = 0; /* in exec'd */
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#endif /* NS_IMPL_COCOA */
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/* Close unused writing end of the pipe. */
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close (daemon_pipe[1]);
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/* Just wait for the child to close its end of the pipe. */
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retval = read (daemon_pipe[0], &buf, 1);
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while (retval == -1 && errno == EINTR);
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fprintf (stderr, "Error reading status from child\n");
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else if (retval == 0)
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fprintf (stderr, "Error: server did not start correctly\n");
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close (daemon_pipe[0]);
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fprintf (stderr, "Cannot fork!\n");
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nfd = open ("/dev/null", O_RDWR);
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#ifdef NS_IMPL_COCOA
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/* In orig process, forked as child, OR in exec'd. */
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if (!dname_arg || !strchr (dname_arg, '\n'))
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{ /* In orig, child: now exec w/special daemon name. */
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if (dname_arg && strlen (dname_arg) > 70)
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fprintf (stderr, "daemon: child name too long\n");
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sprintf (fdStr, "--daemon=\n%d,%d\n%s", daemon_pipe[0],
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daemon_pipe[1], dname_arg ? dname_arg : "");
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argv[skip_args] = fdStr;
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execv (argv[0], argv);
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fprintf (stderr, "emacs daemon: exec failed: %d\t%d\n", errno);
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/* In exec'd: parse special dname into pipe and name info. */
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if (!dname_arg || !strchr (dname_arg, '\n')
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|| strlen (dname_arg) < 1 || strlen (dname_arg) > 70)
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fprintf (stderr, "emacs daemon: daemon name absent or too long\n");
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dname_arg2[0] = '\0';
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sscanf (dname_arg, "\n%d,%d\n%s", &(daemon_pipe[0]), &(daemon_pipe[1]),
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dname_arg = strlen (dname_arg2) ? dname_arg2 : NULL;
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#endif /* NS_IMPL_COCOA */
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daemon_name = xstrdup (dname_arg);
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/* Close unused reading end of the pipe. */
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close (daemon_pipe[0]);
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/* Make sure that the used end of the pipe is closed on exec, so
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that it is not accessible to programs started from .emacs. */
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fcntl (daemon_pipe[1], F_SETFD, FD_CLOEXEC);
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#ifdef HAVE_SETSID
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DEFUN ("daemonp", Fdaemonp, Sdaemonp, 0, 0, 0,
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doc: /* Return t if the current emacs process is a daemon. */)
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return is_daemon ? Qt : Qnil;
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doc: /* Return non-nil if the current emacs process is a daemon.
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If the daemon was given a name argument, return that name. */)
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return build_string (daemon_name);
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DEFUN ("daemon-initialized", Fdaemon_initialized, Sdaemon_initialized, 0, 0, 0,
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doc: /* Mark the Emacs daemon as being initialized.
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This finishes the daemonization process by doing the other half of detaching
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from the parent process and its tty file descriptors. */)
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error ("This function can only be called if emacs is run as a daemon");
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if (daemon_pipe[1] < 0)
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error ("The daemon has already been initialized");
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if (NILP (Vafter_init_time))
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error ("This function can only be called after loading the init files");
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/* Get rid of stdin, stdout and stderr. */
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nfd = open ("/dev/null", O_RDWR);
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/* Closing the pipe will notify the parent that it can exit.
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FIXME: In case some other process inherited the pipe, closing it here
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won't notify the parent because it's still open elsewhere, so we
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additionally send a byte, just to make sure the parent really exits.
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Instead, we should probably close the pipe in start-process and
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call-process to make sure the pipe is never inherited by
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write (daemon_pipe[1], "\n", 1);
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close (daemon_pipe[1]);
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/* Set it to an invalid value so we know we've already run this function. */
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daemon_pipe[1] = -1;
added
removed
src/emacs.c
