Zombie windows, requested by Will Maier.

2025-01-12 19:39:04 +00:00 · 2008-06-29 07:04:31 +00:00 · 2008-06-29 07:04:31 +00:00 · d90d646ca8
commit d90d646ca8
parent 09a4f6a62d
17 changed files with 254 additions and 55 deletions
--- a/17
+++ b/17
@ -1,3 +1,18 @@
+29 June 2008
+
+* Zombie windows. These are not closed when the child process dies. May be
+  set for a window with the new "remain-on-exit" option; the default setting
+  of this flag for new windows may be set with the "remain-by-default" session
+  option.
+
+  A window may be restarted with the respawn-window command:
+
+  	respawn-window [-k] [command]
+	
+  If -k is given, any existing process running in the window is killed;
+  if command is omitted, the same command as when the window was first
+  created is used.
+
 27 June 2008

 * Handle nonexistent session or client to -t properly.
@ -577,4 +592,4 @@
  (including mutt, emacs). No status bar yet and no key remapping or other
  customisation.

-$Id: CHANGES,v 1.145 2008-06-27 17:10:01 nicm Exp $
+$Id: CHANGES,v 1.146 2008-06-29 07:04:28 nicm Exp $
--- a/3
+++ b/3
@ -1,4 +1,4 @@
-# $Id: GNUmakefile,v 1.35 2008-06-25 20:43:13 nicm Exp $
+# $Id: GNUmakefile,v 1.36 2008-06-29 07:04:29 nicm Exp $

 .PHONY: clean

@ -29,6 +29,7 @@ SRCS= tmux.c server.c server-msg.c server-fn.c buffer.c buffer-poll.c status.c \
      cmd-show-window-options.c cmd-command-prompt.c cmd-set-buffer.c \
      cmd-show-buffer.c cmd-list-buffers.c cmd-delete-buffer.c \
      cmd-list-commands.c cmd-move-window.c cmd-select-prompt.c \
+      cmd-respawn-window.c \
      window-scroll.c window-more.c window-copy.c options.c paste.c \
      tty.c tty-keys.c tty-write.c screen-write.c screen-redraw.c

--- a/3
+++ b/3
@ -1,4 +1,4 @@
-# $Id: Makefile,v 1.68 2008-06-25 20:43:13 nicm Exp $
+# $Id: Makefile,v 1.69 2008-06-29 07:04:29 nicm Exp $

 .SUFFIXES: .c .o .y .h
 .PHONY: clean update-index.html upload-index.html
@ -33,6 +33,7 @@ SRCS= tmux.c server.c server-msg.c server-fn.c buffer.c buffer-poll.c status.c \
      cmd-show-window-options.c cmd-command-prompt.c cmd-set-buffer.c \
      cmd-show-buffer.c cmd-list-buffers.c cmd-delete-buffer.c \
      cmd-list-commands.c cmd-move-window.c cmd-select-prompt.c \
+      cmd-respawn-window.c \
      window-scroll.c window-more.c window-copy.c options.c paste.c \
      tty.c tty-keys.c tty-write.c screen-write.c screen-redraw.c

--- a/4
+++ b/4
@ -49,12 +49,13 @@

 -- For 0.4 --------------------------------------------------------------------

+- document zombie windows
 - document buffer stuff
 - document next/prev word
 - commands:	save-buffer -b number filename
 		load-buffer -b number filename
  	      	copy-buffer -s src-session -t dst-session -a src-index -b dst-index
-	       		    (from other session)
+		      		    (from other session)

 -- For 0.5 --------------------------------------------------------------------

@ -73,3 +74,4 @@
  have a "edit-mode" option select which keymap
 - zombie windows: don't disappear when the command dies. new command
  	 respawn-window [command] to restart; ommitting commands uses previous
+- many more info displays for various things
--- a/cmd-generic.c
+++ b/cmd-generic.c
@ -1,4 +1,4 @@
-/* $Id: cmd-generic.c,v 1.11 2008-06-20 08:36:20 nicm Exp $ */
+/* $Id: cmd-generic.c,v 1.12 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
@ -73,6 +73,13 @@ cmd_target_parse(struct cmd *self, int argc, char **argv, char **cause)
 		if (argc != 1)
 			goto usage;
 		data->arg = xstrdup(argv[0]);
+	} else if (self->entry->flags & CMD_ZEROONEARG) {
+		if (argc == 0)
+			data->arg = NULL;
+		else if (argc == 1)
+			data->arg = xstrdup(argv[0]);
+		else
+			goto usage;
 	} else {
 		if (argc != 0)
 			goto usage;
@ -192,6 +199,13 @@ cmd_srcdst_parse(struct cmd *self, int argc, char **argv, char **cause)
 		if (argc != 1)
 			goto usage;
 		data->arg = xstrdup(argv[0]);
+	} else if (self->entry->flags & CMD_ZEROONEARG) {
+		if (argc == 0)
+			data->arg = NULL;
+		else if (argc == 1)
+			data->arg = xstrdup(argv[0]);
+		else
+			goto usage;
 	} else {
 		if (argc != 0)
 			goto usage;
@ -325,6 +339,13 @@ cmd_buffer_parse(struct cmd *self, int argc, char **argv, char **cause)
 		if (argc != 1)
 			goto usage;
 		data->arg = xstrdup(argv[0]);
+	} else if (self->entry->flags & CMD_ZEROONEARG) {
+		if (argc == 0)
+			data->arg = NULL;
+		else if (argc == 1)
+			data->arg = xstrdup(argv[0]);
+		else
+			goto usage;
 	} else {
 		if (argc != 0)
 			goto usage;
--- a/cmd-list-windows.c
+++ b/cmd-list-windows.c
@ -1,4 +1,4 @@
-/* $Id: cmd-list-windows.c,v 1.20 2008-06-05 21:25:00 nicm Exp $ */
+/* $Id: cmd-list-windows.c,v 1.21 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -50,6 +50,7 @@ cmd_list_windows_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct window		*w;
 	u_int			 i;
 	unsigned long long	 size;
+	const char		*name;

 	if ((s = cmd_find_session(ctx, data->target)) == NULL)
 		return;
@ -65,9 +66,13 @@ cmd_list_windows_exec(struct cmd *self, struct cmd_ctx *ctx)
 		size += w->base.hsize * (sizeof *w->base.grid_colr);
 		size += w->base.hsize * (sizeof *w->base.grid_size);

+		if (w->fd != -1)
+			name = ttyname(w->fd);
+		else
+			name = "";
 		ctx->print(ctx,
 		    "%d: %s \"%s\" (%s) [%ux%u] [history %u/%u, %llu bytes]",
-		    wl->idx, w->name, w->base.title, ttyname(w->fd),
+		    wl->idx, w->name, w->base.title, name,
 		    screen_size_x(&w->base), screen_size_y(&w->base),
 		    w->base.hsize, w->base.hlimit, size);
 	}
--- a/cmd-respawn-window.c
+++ b/cmd-respawn-window.c
@ -0,0 +1,74 @@
+/* $Id: cmd-respawn-window.c,v 1.1 2008-06-29 07:04:30 nicm Exp $ */
+
+/*
+ * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include "tmux.h"
+
+/*
+ * Respawn a window (restart the command). Kill existing if -k given.
+ */
+
+void	cmd_respawn_window_exec(struct cmd *, struct cmd_ctx *);
+
+const struct cmd_entry cmd_respawn_window_entry = {
+	"respawn-window", "respawnw",
+	"[-k] " CMD_TARGET_WINDOW_USAGE " [command]",
+	CMD_ZEROONEARG|CMD_KFLAG,
+	cmd_target_init,
+	cmd_target_parse,
+	cmd_respawn_window_exec,
+	cmd_target_send,
+	cmd_target_recv,
+	cmd_target_free,
+	cmd_target_print
+};
+
+void
+cmd_respawn_window_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct cmd_target_data	*data = self->data;
+	struct winlink		*wl;
+	struct session		*s;
+	const char		*env[] = { NULL, "TERM=screen", NULL };
+	char			*cmd;
+
+	if ((wl = cmd_find_window(ctx, data->target, &s)) == NULL)
+		return;
+
+	if (wl->window->fd != -1 && !(data->flags & CMD_KFLAG)) {
+		ctx->error(ctx, "window still active: %s:%d", s->name, wl->idx);
+		return;
+	}
+
+	cmd = data->arg;
+	if (cmd == NULL)
+		cmd = options_get_string(&s->options, "default-command");
+	
+	if (window_spawn(wl->window, cmd, env) != 0) {
+		ctx->error(ctx, "respawn failed: %s:%d", s->name, wl->idx);
+		return;
+	}
+	screen_reset(&wl->window->base);
+
+	recalculate_sizes();
+	server_redraw_window(wl->window);
+
+	if (ctx->cmdclient != NULL)
+		server_write_client(ctx->cmdclient, MSG_EXIT, NULL, 0);
+}
--- a/cmd-set-option.c
+++ b/cmd-set-option.c
@ -1,4 +1,4 @@
-/* $Id: cmd-set-option.c,v 1.36 2008-06-23 22:12:29 nicm Exp $ */
+/* $Id: cmd-set-option.c,v 1.37 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -64,6 +64,7 @@ const struct set_option_entry set_option_table[NSETOPTION] = {
 	{ "display-time", SET_OPTION_NUMBER, 1, INT_MAX, NULL },
 	{ "history-limit", SET_OPTION_NUMBER, 0, SHRT_MAX, NULL },
 	{ "prefix", SET_OPTION_KEY, 0, 0, NULL },
+	{ "remain-by-default", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "set-titles", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "status", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "status-bg", SET_OPTION_COLOUR, 0, 0, NULL },
--- a/cmd-set-window-option.c
+++ b/cmd-set-window-option.c
@ -1,4 +1,4 @@
-/* $Id: cmd-set-window-option.c,v 1.10 2008-06-18 22:21:51 nicm Exp $ */
+/* $Id: cmd-set-window-option.c,v 1.11 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -218,6 +218,20 @@ cmd_set_window_option_exec(struct cmd *self, struct cmd_ctx *ctx)
 		    s->name, wl->idx, number);

 		recalculate_sizes();
+	} else if (strcmp(data->option, "remain-on-exit") == 0) {
+		if (flag == -1) {
+			ctx->error(ctx, "bad value: %s", data->value);
+			return;
+		}
+
+		if (flag == -2)
+			wl->window->flags ^= WINDOW_ZOMBIFY;
+		else {
+			if (flag)
+				wl->window->flags |= WINDOW_ZOMBIFY;
+			else
+				wl->window->flags &= ~WINDOW_ZOMBIFY;
+		}
 	} else {
 		ctx->error(ctx, "unknown option: %s", data->option);
 		return;
--- a/cmd-show-window-options.c
+++ b/cmd-show-window-options.c
@ -1,4 +1,4 @@
-/* $Id: cmd-show-window-options.c,v 1.1 2008-06-16 06:10:02 nicm Exp $ */
+/* $Id: cmd-show-window-options.c,v 1.2 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -60,6 +60,8 @@ cmd_show_window_options_exec(struct cmd *self, struct cmd_ctx *ctx)
 		ctx->print(ctx, "force-height %u", wl->window->limity);
 	if (wl->window->flags & WINDOW_MONITOR)
 		ctx->print(ctx, "monitor-activity");
+	if (wl->window->flags & WINDOW_ZOMBIFY)
+		ctx->print(ctx, "remain-on-exit");

 	if (ctx->cmdclient != NULL)
 		server_write_client(ctx->cmdclient, MSG_EXIT, NULL, 0);
--- a/cmd.c
+++ b/cmd.c
@ -1,4 +1,4 @@
-/* $Id: cmd.c,v 1.59 2008-06-27 17:10:01 nicm Exp $ */
+/* $Id: cmd.c,v 1.60 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -54,6 +54,7 @@ const struct cmd_entry *cmd_table[] = {
 	&cmd_refresh_client_entry,
 	&cmd_rename_session_entry,
 	&cmd_rename_window_entry,
+	&cmd_respawn_window_entry,
 	&cmd_scroll_mode_entry,
 	&cmd_select_prompt_entry,
 	&cmd_select_window_entry,
--- a/screen.c
+++ b/screen.c
@ -1,4 +1,4 @@
-/* $Id: screen.c,v 1.62 2008-06-18 22:21:51 nicm Exp $ */
+/* $Id: screen.c,v 1.63 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -156,6 +156,27 @@ screen_create(struct screen *s, u_int dx, u_int dy, u_int hlimit)
 	screen_clear_selection(s);
 }

+/* Reinitialise screen. */
+void
+screen_reset(struct screen *s)
+{
+	s->cx = 0;
+	s->cy = 0;
+
+	s->rupper = 0;
+	s->rlower = s->dy - 1;
+
+	s->attr = SCREEN_DEFATTR;
+	s->colr = SCREEN_DEFCOLR;
+
+	s->mode = MODE_CURSOR|MODE_KCURSOR|MODE_KKEYPAD;
+
+	screen_display_fill_area(s, 0, 0, 
+	    screen_size_x(s), screen_size_y(s), ' ', 0, 0x88);
+	
+	screen_clear_selection(s);	
+}
+
 /* Resize screen. */
 void
 screen_resize(struct screen *s, u_int sx, u_int sy)
--- a/server.c
+++ b/server.c
@ -1,4 +1,4 @@
-/* $Id: server.c,v 1.76 2008-06-23 07:41:21 nicm Exp $ */
+/* $Id: server.c,v 1.77 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -263,7 +263,7 @@ server_fill_windows(struct pollfd **pfd)
 	u_int		 i;

 	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
-		if ((w = ARRAY_ITEM(&windows, i)) == NULL)
+		if ((w = ARRAY_ITEM(&windows, i)) == NULL || w->fd == -1)
 			(*pfd)->fd = -1;
 		else {
 			(*pfd)->fd = w->fd;
@ -284,7 +284,7 @@ server_handle_windows(struct pollfd **pfd)
 	u_int		 i;

 	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
-		if ((w = ARRAY_ITEM(&windows, i)) != NULL) {
+		if ((w = ARRAY_ITEM(&windows, i)) != NULL && w->fd != -1) {
 			log_debug("testing window %d (%d)", (*pfd)->fd, w->fd);
 			if (buffer_poll(*pfd, w->in, w->out) != 0)
 				server_lost_window(w);
@ -629,6 +629,11 @@ server_lost_window(struct window *w)

 	log_debug("lost window %d", w->fd);

+	if (w->flags & WINDOW_ZOMBIFY) {
+		w->fd = -1;
+		return;
+	}
+
 	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
 		s = ARRAY_ITEM(&sessions, i);
 		if (s == NULL)
--- a/session.c
+++ b/session.c
@ -1,4 +1,4 @@
-/* $Id: session.c,v 1.39 2008-06-20 08:36:20 nicm Exp $ */
+/* $Id: session.c,v 1.40 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -203,6 +203,10 @@ session_new(struct session *s, const char *name, const char *cmd, int idx)
 	hlimit = options_get_number(&s->options, "history-limit");
 	if ((w = window_create(name, cmd, env, s->sx, s->sy, hlimit)) == NULL)
 		return (NULL);
+
+	if (options_get_number(&s->options, "remain-by-default"))
+		w->flags |= WINDOW_ZOMBIFY;
+	
 	return (session_attach(s, w, idx));
 }

--- a/tmux.c
+++ b/tmux.c
@ -1,4 +1,4 @@
-/* $Id: tmux.c,v 1.69 2008-06-23 22:12:29 nicm Exp $ */
+/* $Id: tmux.c,v 1.70 2008-06-29 07:04:30 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -222,6 +222,7 @@ main(int argc, char **argv)
 	options_set_number(&global_options, "status-interval", 15);
 	options_set_number(&global_options, "set-titles", 1);
 	options_set_number(&global_options, "buffer-limit", 9);
+	options_set_number(&global_options, "remain-by-default", 0);

 	if (cfg_file == NULL) {
 		home = getenv("HOME");
--- a/tmux.h
+++ b/tmux.h
@ -1,4 +1,4 @@
-/* $Id: tmux.h,v 1.170 2008-06-25 20:43:14 nicm Exp $ */
+/* $Id: tmux.h,v 1.171 2008-06-29 07:04:31 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -549,6 +549,7 @@ struct window_mode {
 /* Window structure. */
 struct window {
 	char		*name;
+	char		*cmd;

 	int		 fd;
 	struct buffer	*in;
@ -562,6 +563,7 @@ struct window {
 #define WINDOW_ACTIVITY 0x4
 #define WINDOW_MONITOR 0x8
 #define WINDOW_AGGRESSIVE 0x10
+#define WINDOW_ZOMBIFY 0x20

 	u_int		 limitx;
 	u_int		 limity;
@ -764,6 +766,7 @@ struct cmd_entry {
 #define CMD_KFLAG 0x4
 #define CMD_DFLAG 0x8
 #define CMD_ONEARG 0x10
+#define CMD_ZEROONEARG 0x20
 	int		 flags;

 	void		 (*init)(struct cmd *, int);
@ -821,7 +824,7 @@ struct set_option_entry {
 	const char     **choices;
 };
 extern const struct set_option_entry set_option_table[];
-#define NSETOPTION 13
+#define NSETOPTION 14

 #ifdef NO_STRTONUM
 /* strtonum.c */
@ -967,6 +970,7 @@ extern const struct cmd_entry cmd_previous_window_entry;
 extern const struct cmd_entry cmd_refresh_client_entry;
 extern const struct cmd_entry cmd_rename_session_entry;
 extern const struct cmd_entry cmd_rename_window_entry;
+extern const struct cmd_entry cmd_respawn_window_entry;
 extern const struct cmd_entry cmd_scroll_mode_entry;
 extern const struct cmd_entry cmd_select_window_entry;
 extern const struct cmd_entry cmd_send_keys_entry;
@ -1171,6 +1175,7 @@ void	screen_redraw_columns(struct screen_redraw_ctx *, u_int, u_int);
 const char *screen_colourstring(u_char);
 u_char	 screen_stringcolour(const char *);
 void	 screen_create(struct screen *, u_int, u_int, u_int);
+void	 screen_reset(struct screen *);
 void	 screen_destroy(struct screen *);
 void	 screen_resize(struct screen *, u_int, u_int);
 void	 screen_expand_line(struct screen *, u_int, u_int);
@ -1201,7 +1206,8 @@ void		 winlink_remove(struct winlinks *, struct winlink *);
 struct winlink	*winlink_next(struct winlinks *, struct winlink *);
 struct winlink	*winlink_previous(struct winlinks *, struct winlink *);
 struct window	*window_create(const char *,
-		     const char *, const char **, u_int, u_int, u_int);
+    const char *, const char **, u_int, u_int, u_int);
+int		 window_spawn(struct window *, const char *, const char **);
 void		 window_destroy(struct window *);
 int		 window_resize(struct window *, u_int, u_int);
 int		 window_set_mode(struct window *, const struct window_mode *);
--- a/window.c
+++ b/window.c
@ -1,4 +1,4 @@
-/* $Id: window.c,v 1.45 2008-06-20 17:31:48 nicm Exp $ */
+/* $Id: window.c,v 1.46 2008-06-29 07:04:31 nicm Exp $ */

 /*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -166,50 +166,25 @@ winlink_previous(unused struct winlinks *wwl, struct winlink *wl)

 struct window *
 window_create(const char *name,
-    const char *cmd, const char **env, u_int sx, u_int sy, u_int hlimit)
+    const char *cmd, const char **envp, u_int sx, u_int sy, u_int hlimit)
 {
 	struct window	*w;
-	struct winsize	 ws;
-	int		 fd, mode;
 	char		*ptr, *copy;
-	const char     **entry;
-
-	memset(&ws, 0, sizeof ws);
-	ws.ws_col = sx;
-	ws.ws_row = sy;
-
- 	switch (forkpty(&fd, NULL, NULL, &ws)) {
-	case -1:
-		return (NULL);
-	case 0:
-		for (entry = env; *entry != NULL; entry++) {
-			if (putenv(*entry) != 0)
-				fatal("putenv failed");
-		}
-		sigreset();
-		log_debug("started child: cmd=%s; pid=%d", cmd, (int) getpid());
-		log_close();
-
-		execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
-		fatal("execl failed");
-	}
-
-	if ((mode = fcntl(fd, F_GETFL)) == -1)
-		fatal("fcntl failed");
-	if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
-		fatal("fcntl failed");
-	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
-		fatal("fcntl failed");

 	w = xmalloc(sizeof *w);
-	w->fd = fd;
+	w->cmd = NULL;
+
+	w->fd = -1;
 	w->in = buffer_create(BUFSIZ);
 	w->out = buffer_create(BUFSIZ);
+
 	w->mode = NULL;
 	w->flags = 0;
+
 	w->limitx = w->limity = UINT_MAX;
 	screen_create(&w->base, sx, sy, hlimit);
 	w->screen = &w->base;
+
 	input_init(w);

 	if (name == NULL) {
@ -238,9 +213,58 @@ window_create(const char *name,
 	ARRAY_ADD(&windows, w);
 	w->references = 0;

+	if (window_spawn(w, cmd, envp) != 0) {
+		window_destroy(w);
+		return (NULL);
+	}
 	return (w);
 }

+int
+window_spawn(struct window *w, const char *cmd, const char **envp)
+{
+	struct winsize	 ws;
+	int		 mode;
+	const char     **envq;
+
+	if (w->fd != -1)
+		close(w->fd);
+	if (cmd != NULL) {
+		if (w->cmd != NULL)
+			xfree(w->cmd);
+		w->cmd = xstrdup(cmd);
+	}
+
+	memset(&ws, 0, sizeof ws);
+	ws.ws_col = screen_size_x(&w->base);
+	ws.ws_row = screen_size_y(&w->base);
+
+ 	switch (forkpty(&w->fd, NULL, NULL, &ws)) {
+	case -1:
+		return (1);
+	case 0:
+		for (envq = envp; *envq != NULL; envq++) {
+			if (putenv(*envq) != 0)
+				fatal("putenv failed");
+		}
+		sigreset();
+		log_debug("new child: cmd=%s; pid=%d", w->cmd, (int) getpid());
+		log_close();
+
+		execl(_PATH_BSHELL, "sh", "-c", w->cmd, (char *) NULL);
+		fatal("execl failed");
+	}
+
+	if ((mode = fcntl(w->fd, F_GETFL)) == -1)
+		fatal("fcntl failed");
+	if (fcntl(w->fd, F_SETFL, mode|O_NONBLOCK) == -1)
+		fatal("fcntl failed");
+	if (fcntl(w->fd, F_SETFD, FD_CLOEXEC) == -1)
+		fatal("fcntl failed");
+	
+	return (0);
+}
+
 void
 window_destroy(struct window *w)
 {
@ -252,7 +276,8 @@ window_destroy(struct window *w)
 	}
 	ARRAY_REMOVE(&windows, i);

-	close(w->fd);
+	if (w->fd != -1)
+		close(w->fd);

 	input_free(w);

@ -282,7 +307,7 @@ window_resize(struct window *w, u_int sx, u_int sy)
 	if (w->mode != NULL)
 		w->mode->resize(w, sx, sy);

-	if (ioctl(w->fd, TIOCSWINSZ, &ws) == -1)
+	if (w->fd != -1 && ioctl(w->fd, TIOCSWINSZ, &ws) == -1)
 		fatal("ioctl failed");
 	return (0);
 }