Package: emacs;
Reported by: Dan Nicolaescu <dann <at> ics.uci.edu>
Date: Sun, 2 Nov 2008 18:25:04 UTC
Severity: wishlist
Done: Dan Nicolaescu <dann <at> ics.uci.edu>
Bug is archived. No further changes may be made.
Message #55 received at 1298 <at> emacsbugs.donarmstrong.com (full text, mbox):
From: Dan Nicolaescu <dann <at> ics.uci.edu> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 1298 <at> debbugs.gnu.org Subject: Re: bug#1298: allow 'emacsclient -a "emacs --daemon && emacsclient -c"' Date: Sun, 7 Dec 2008 23:54:33 -0800 (PST)
Stefan Monnier <monnier <at> iro.umontreal.ca> writes:
> > How about something like:
> > emacsclient --start-daemon
>
> You mean "emacsclient --start-daemon-if-needed FILENAME" ?
> Yes, probably something like that. It could potentially be folded into
> the alternate-editor (e.g. if alternate-editor has some special value
> such as the empty string).
How does the patch below look like?
There's one refinement possible: make --start-daemon-if-needed take an
argument --start-daemon-if-needed=ARG and use it like this: emacs --daemon=ARG
Index: emacsclient.c
===================================================================
RCS file: /cvsroot/emacs/emacs/lib-src/emacsclient.c,v
retrieving revision 1.142
diff -u -3 -p -c -r1.142 emacsclient.c
cvs diff: conflicting specifications of output style
--- emacsclient.c 3 Dec 2008 04:33:44 -0000 1.142
+++ emacsclient.c 8 Dec 2008 07:52:45 -0000
@@ -150,6 +150,10 @@
/* PID of the Emacs server process. */
int emacs_pid = 0;
+/* In case connecting to the server fails, try connecting again after
+ starting the emacs daemon. */
+int start_daemon_if_needed = 0;
+
void print_help_and_exit () NO_RETURN;
struct option longopts[] =
@@ -162,6 +166,7 @@
{ "nw", no_argument, NULL, 't' },
{ "create-frame", no_argument, NULL, 'c' },
{ "alternate-editor", required_argument, NULL, 'a' },
+ { "start-daemon-if-needed", no_argument, NULL, 'D' },
#ifndef NO_SOCKETS_IN_FILE_SYSTEM
{ "socket-name", required_argument, NULL, 's' },
#endif
@@ -492,7 +497,7 @@
{
int opt = getopt_long_only (argc, argv,
#ifndef NO_SOCKETS_IN_FILE_SYSTEM
- "VHnea:s:f:d:tc",
+ "VHneDa:s:f:d:tc",
#else
"VHnea:f:d:tc",
#endif
@@ -552,6 +557,10 @@
current_frame = 0;
break;
+ case 'D':
+ start_daemon_if_needed = 1;
+ break;
+
case 'H':
print_help_and_exit ();
break;
@@ -563,6 +572,12 @@
}
}
+ if (start_daemon_if_needed && alternate_editor != NULL)
+ {
+ message (TRUE, "--alternate-editor cannot be used when using --start_daemon_if_needed\n");
+ exit (EXIT_FAILURE);
+ }
+
/* If the -c option is used (without -t) and no --display argument
is provided, try $DISPLAY.
Without the -c option, we used to set `display' to $DISPLAY by
@@ -1294,7 +1309,7 @@
#endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */
HSOCKET
-set_socket ()
+set_socket (int no_exit_if_error)
{
HSOCKET s;
@@ -1305,7 +1320,7 @@
if (socket_name)
{
s = set_local_socket ();
- if ((s != INVALID_SOCKET) || alternate_editor)
+ if ((s != INVALID_SOCKET) || no_exit_if_error)
return s;
message (TRUE, "%s: error accessing socket \"%s\"\n",
progname, socket_name);
@@ -1320,7 +1335,7 @@
if (server_file)
{
s = set_tcp_socket ();
- if ((s != INVALID_SOCKET) || alternate_editor)
+ if ((s != INVALID_SOCKET) || no_exit_if_error)
return s;
message (TRUE, "%s: error accessing server file \"%s\"\n",
@@ -1338,7 +1353,7 @@
/* Implicit server file. */
server_file = "server";
s = set_tcp_socket ();
- if ((s != INVALID_SOCKET) || alternate_editor)
+ if ((s != INVALID_SOCKET) || no_exit_if_error)
return s;
/* No implicit or explicit socket, and no alternate editor. */
@@ -1353,7 +1368,7 @@
}
#ifdef WINDOWSNT
-FARPROC set_fg; /* Pointer to AllowSetForegroundWindow. */
+FARPROC se t_fg; /* Pointer to AllowSetForegroundWindow. */
FARPROC get_wc; /* Pointer to RealGetWindowClassA. */
BOOL CALLBACK
@@ -1416,6 +1431,8 @@
int i, rl, needlf = 0;
char *cwd, *str;
char string[BUFSIZ+1];
+ int null_socket_name;
+ int null_server_file;
main_argv = argv;
progname = argv[0];
@@ -1431,9 +1448,57 @@
exit (EXIT_FAILURE);
}
- if ((emacs_socket = set_socket ()) == INVALID_SOCKET)
- fail ();
+ if (start_daemon_if_needed)
+ {
+ /* set_socket changes the values for socket_name and
+ server_file, we need to reset them, if they were NULL before
+ for the second call to set_socket. */
+ null_socket_name = (socket_name == NULL);
+ null_server_file = (server_file == NULL);
+ }
+
+ if ((emacs_socket = set_socket (alternate_editor || start_daemon_if_needed)) == INVALID_SOCKET)
+ if (start_daemon_if_needed)
+ {
+ pid_t dpid;
+ int status;
+ pid_t p;
+
+ dpid = fork ();
+ if (dpid > 0)
+ {
+ p = waitpid (dpid, &status, WUNTRACED | WCONTINUED);
+
+ /* Reset socket_name and server_file if they were NULL
+ before the set_socket call. */
+ if (null_socket_name)
+ socket_name = NULL;
+ if (null_server_file)
+ server_file = NULL;
+
+ /* Try connecting again, the daemon should have started by
+ now. */
+ message (TRUE, "daemon should have started, trying to connect again\n", dpid);
+ if ((emacs_socket = set_socket (1)) == INVALID_SOCKET)
+ message (TRUE, "Cannot connect even after starting the daemon\n");
+ }
+ else if (dpid < 0)
+ {
+ fprintf (stderr, "Cannot fork!\n");
+ exit (1);
+ }
+ else
+ {
+ char *const d_argv[] = {"emacs", "--daemon", 0 };
+
+ /* Start the daemon. */
+ execvp ("emacs", d_argv);
+ message (TRUE, "%s: error starting emacs daemon\n", progname);
+ }
+ }
+ else
+ fail ();
cwd = get_current_dir_name ();
if (cwd == 0)
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