* bug#16262: 24.3.50; Mac OSX emacs --daemon reports "server did not start correctly"
@ 2013-12-26 22:36 Phillip Dixon
2013-12-28 23:00 ` Paul Eggert
0 siblings, 1 reply; 3+ messages in thread
From: Phillip Dixon @ 2013-12-26 22:36 UTC (permalink / raw)
To: 16262
In GNU Emacs 24.3.50.1 (x86_64-apple-darwin13.0.0, NS apple-appkit-1265.00)
of 2013-12-25 on pdAir.local
Windowing system distributor `Apple', version 10.3.1265
Configured using:
`configure --with-ns'
Important settings:
locale-coding-system: utf-8-unix
When launch emacs using
emacs -Q --daemon
The daemon starts but reports
Error: server did not start correctly
Among other things this means that trying to auto launch the daemon
using
emacsclient -a ""
doesn't work.
emacs 24.3 correctly reports that the daemon launch.
The issue appears to have been introduced by changeset
rev. 113315, Make file descriptors close-on-exec when possible.
The NS port uses a pipe between the parent and child processes to signal
when the newly forked child is ready. rev 113315 makes the pipe used to
do this synchronisation unavailable to the child process.
The following patch reverts the portions of rev. 113315 that impact
daemon launch on NS. It seems to fix the problem for me.
diff --git a/src/emacs.c b/src/emacs.c
index 35e8ff3..53f65c0 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -1026,7 +1026,7 @@ main (int argc, char **argv)
use a pipe for synchronization. The parent waits for the child
to close its end of the pipe (using `daemon-initialized')
before exiting. */
- if (emacs_pipe (daemon_pipe) != 0)
+ if (pipe(daemon_pipe) == -1)
{
fprintf (stderr, "Cannot pipe!\n");
exit (1);
@@ -1122,7 +1122,9 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
daemon_name = xstrdup (dname_arg);
/* Close unused reading end of the pipe. */
emacs_close (daemon_pipe[0]);
-
+ /* Make sure that the used end of the pipe is closed on exec,
+ that it is not accessible to programs started from .emacs. */
+ fcntl (daemon_pipe[1], F_SETFD, FD_CLOEXEC);
setsid ();
#else /* DOS_NT */
fprintf (stderr, "This platform does not support the -daemon flag.\n");
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2013-12-26 22:36 bug#16262: 24.3.50; Mac OSX emacs --daemon reports "server did not start correctly" Phillip Dixon
2013-12-28 23:00 ` Paul Eggert
2014-01-02 22:02 ` Phillip Dixon
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