Don't hang when window closes early; also add lots more debugging.

CHANGES

@@ -1,3 +1,10 @@
+31 May 2008
+
+* Fix so tmux doesn't hang if the initial window fails for some reason. This
+  was highlighted by problems on Darwin, thanks to Elias Pipping for the report
+  and access to a test account. (tmux still won't work on Darwin since its
+  poll(2) is broken.)
+
 02 January 2008
 
 * Don't attempt to reset the tty on exit if it has been closed externally.
@@ -303,4 +310,4 @@
   (including mutt, emacs). No status bar yet and no key remapping or other
   customisation.
 
-$Id: CHANGES,v 1.93 2008-05-10 12:50:25 nicm Exp $
+$Id: CHANGES,v 1.94 2008-05-31 20:04:15 nicm Exp $

NOTES

@@ -47,7 +47,7 @@ TERM=screen (tmux in screen), xterm, xterm-color and rxvt. Note that tmux
 (and screen) relies on an AX term capability to detect if the terminal
 supports "default" (transparent) foreground and background colours. On OpenBSD,
 TERM=xterm and TERM=xterm-color lack this; TERM=rxvt does have it and works fine
-at least with the aterm and (naturally) rxvt terminal emulators.
+at least with the aterm and rxvt terminal emulators.
 
 For debugging, running tmux with -v or -vv will generate server and client log
 files in the current directory.
@@ -57,9 +57,6 @@ welcome. Please email:
 
 	nicm@users.sf.net
 
-Or contact me during UK daytime hours (0900 to 2300 UTC or so) as "NicM" on
-freenode or efnet IRC. I sometimes ignore private msgs from people I don't
-know, so please mention tmux initially (rather than just saying "hi" ;-).
-
 -- Nicholas Marriott <nicm@users.sf.net>
-$Id: NOTES,v 1.31 2007-11-26 20:50:31 nicm Exp $
+
+$Id: NOTES,v 1.32 2008-05-31 20:04:15 nicm Exp $

TODO

@@ -71,8 +71,10 @@
 	-- it's not kkeypad/kcursor
 - fix kkeypad/kcursor
 - c/p is still borken in some ways
+- tobiasu says it is borken on Linux with aterm + TERM=rxvt
 
--- For 0.2 --------------------------------------------------------------------
+-- For 0.3 --------------------------------------------------------------------
 - anything which uses cmd_{send,recv}_string will break if the string is
   split. string length should be part of the command size
 - chmod +x socket when any client is attached (upd in lost/accept)
+

buffer-poll.c

@@ -1,4 +1,4 @@
-/* $Id: buffer-poll.c,v 1.4 2007-11-30 11:08:34 nicm Exp $ */
+/* $Id: buffer-poll.c,v 1.5 2008-05-31 20:04:15 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -41,11 +41,15 @@ buffer_poll(struct pollfd *pfd, struct buffer *in, struct buffer *out)
 {
 	ssize_t	n;
 
+	log_debug("buffer_poll (%d): fd=%d, revents=%d; out=%zu in=%zu",
+	    getpid(), pfd->fd, pfd->revents, BUFFER_USED(out), BUFFER_USED(in));
+
 	if (pfd->revents & (POLLERR|POLLNVAL|POLLHUP))
 		return (-1);
 	if (pfd->revents & POLLIN) {
 		buffer_ensure(in, BUFSIZ);
 		n = read(pfd->fd, BUFFER_IN(in), BUFFER_FREE(in));
+		log_debug("buffer_poll: fd=%d, read=%zd", pfd->fd, n);
 		if (n == 0)
 			return (-1);
 		if (n == -1) {
@@ -56,6 +60,7 @@ buffer_poll(struct pollfd *pfd, struct buffer *in, struct buffer *out)
 	}
 	if (BUFFER_USED(out) > 0 && pfd->revents & POLLOUT) {
 		n = write(pfd->fd, BUFFER_OUT(out), BUFFER_USED(out));	
+		log_debug("buffer_poll: fd=%d, write=%zd", pfd->fd, n);
 		if (n == -1) {
 			if (errno != EINTR && errno != EAGAIN)
 				return (-1);

client.c

@@ -1,4 +1,4 @@
-/* $Id: client.c,v 1.25 2007-12-06 09:46:21 nicm Exp $ */
+/* $Id: client.c,v 1.26 2008-05-31 20:04:15 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -130,6 +130,19 @@ client_main(struct client_ctx *cctx)
 		if (sigwinch)
 			client_handle_winch(cctx);
 
+		switch (client_msg_dispatch(cctx, &error)) {
+		case -1:
+			goto out;
+		case 0:
+			/* May be more in buffer, don't let poll block. */
+			timeout = 0;
+			break;
+		default:
+			/* Out of data, poll may block. */
+			timeout = INFTIM;
+			break;
+		}
+
 		pfd.fd = cctx->srv_fd;
 		pfd.events = POLLIN;
 		if (BUFFER_USED(cctx->srv_out) > 0)
@@ -143,19 +156,6 @@ client_main(struct client_ctx *cctx)
 
 		if (buffer_poll(&pfd, cctx->srv_in, cctx->srv_out) != 0)
 			goto server_dead;
-
-		switch (client_msg_dispatch(cctx, &error)) {
-		case -1:
-			goto out;
-		case 0:
-			/* May be more in buffer, don't let poll block. */
-			timeout = 0;
-			break;
-		default:
-			/* Out of data, poll may block. */
-			timeout = INFTIM;
-			break;
-		}
 	}
 
 out:

server.c

@@ -1,4 +1,4 @@
-/* $Id: server.c,v 1.44 2007-12-06 09:46:23 nicm Exp $ */
+/* $Id: server.c,v 1.45 2008-05-31 20:04:15 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -153,12 +153,14 @@ server_main(const char *srv_path, int srv_fd)
 		server_fill_clients(&pfd);
 
 		/* Do the poll. */
-		if (poll(pfds, nfds, INFTIM) == -1) {
+		log_debug("polling %d fds", nfds);
+		if ((nfds = poll(pfds, nfds, INFTIM)) == -1) {
 			if (errno == EAGAIN || errno == EINTR)
 				continue;
 			fatal("poll failed");
 		}
 		pfd = pfds;
+		log_debug("poll returned %d", nfds);
 
 		/* Handle server socket. */
 		if (pfd->revents & (POLLERR|POLLNVAL|POLLHUP))
@@ -215,6 +217,7 @@ server_fill_windows(struct pollfd **pfd)
 			(*pfd)->events = POLLIN;
 			if (BUFFER_USED(w->out) > 0)
 				(*pfd)->events |= POLLOUT;
+			log_debug("adding window %d (%d)", (*pfd)->fd, w->fd);
 		}
 		(*pfd)++;
 	}
@@ -229,6 +232,7 @@ server_handle_windows(struct pollfd **pfd)
 
 	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
 		if ((w = ARRAY_ITEM(&windows, i)) != NULL) {
+			log_debug("testing window %d (%d)", (*pfd)->fd, w->fd);
 			if (buffer_poll(*pfd, w->in, w->out) != 0)
 				server_lost_window(w);
 			else
@@ -255,16 +259,18 @@ server_fill_clients(struct pollfd **pfd)
 			(*pfd)->events = POLLIN;
 			if (BUFFER_USED(c->out) > 0)
 				(*pfd)->events |= POLLOUT;
+			log_debug("adding client %d (%d)", (*pfd)->fd, c->fd);
 		}
 		(*pfd)++;
 
-		if (c == NULL || c->tty.fd == -1)
+		if (c == NULL || c->tty.fd == -1 || c->session == NULL)
 			(*pfd)->fd = -1;
 		else {
 			(*pfd)->fd = c->tty.fd;
 			(*pfd)->events = POLLIN;
 			if (BUFFER_USED(c->tty.out) > 0)
 				(*pfd)->events |= POLLOUT;
+			log_debug("adding tty %d (%d)", (*pfd)->fd, c->tty.fd);
 		}
 		(*pfd)++;
 	}
@@ -281,6 +287,7 @@ server_handle_clients(struct pollfd **pfd)
 		c = ARRAY_ITEM(&clients, i);
 
 		if (c != NULL) {
+			log_debug("testing client %d (%d)", (*pfd)->fd, c->fd);
 			if (buffer_poll(*pfd, c->in, c->out) != 0) {
 				server_lost_client(c);
 				(*pfd) += 2;
@@ -291,6 +298,7 @@ server_handle_clients(struct pollfd **pfd)
 		(*pfd)++;
 
 		if (c != NULL && c->tty.fd != -1 && c->session != NULL) {
+			log_debug("testing tty %d (%d)", (*pfd)->fd, c->tty.fd);
 			if (buffer_poll(*pfd, c->tty.in, c->tty.out) != 0)
 				server_lost_client(c);
 			else

window.c

@@ -1,4 +1,4 @@
-/* $Id: window.c,v 1.35 2008-01-02 19:22:21 nicm Exp $ */
+/* $Id: window.c,v 1.36 2008-05-31 20:04:15 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -178,6 +178,7 @@ window_create(
 				fatal("putenv failed");
 		}
 		sigreset();
+		log_debug("started child: cmd=%s; pid=%d", cmd, getpid());
 		log_close();
 		
 		execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);