Sync OpenBSD patchset 1114:

Instead of passing stdin/stdout/stderr file descriptors over imsg and
handling them in the server, handle them in the client and pass buffers
over imsg. This is much tidier for some upcoming changes and the
performance hit isn't critical.

The tty fd is still passed to the server as before.

This bumps the tmux protocol version so new clients and old servers are
incompatible.

1 files changed, 38 insertions, 121 deletions

diff --git a/server-client.c b/server-client.c
index 6e2484e0..449190fd 100644
--- a/server-client.c
+++ b/server-client.c
@@ -34,9 +34,6 @@ void	server_client_check_exit(struct client *);
 void	server_client_check_redraw(struct client *);
 void	server_client_set_title(struct client *);
 void	server_client_reset_state(struct client *);
-void	server_client_in_callback(struct bufferevent *, short, void *);
-void	server_client_out_callback(struct bufferevent *, short, void *);
-void	server_client_err_callback(struct bufferevent *, short, void *);
 
 int	server_client_msg_dispatch(struct client *);
 void	server_client_msg_command(struct client *, struct msg_command_data *);
@@ -66,9 +63,9 @@ server_client_create(int fd)
 		fatal("gettimeofday failed");
 	memcpy(&c->activity_time, &c->creation_time, sizeof c->activity_time);
 
-	c->stdin_event = NULL;
-	c->stdout_event = NULL;
-	c->stderr_event = NULL;
+	c->stdin_data = evbuffer_new ();
+	c->stdout_data = evbuffer_new ();
+	c->stderr_data = evbuffer_new ();
 
 	c->tty.fd = -1;
 	c->title = NULL;
@@ -143,24 +140,9 @@ server_client_lost(struct client *c)
 	if (c->flags & CLIENT_TERMINAL)
 		tty_free(&c->tty);
 
-	if (c->stdin_event != NULL)
-		bufferevent_free(c->stdin_event);
-	if (c->stdin_fd != -1) {
-		setblocking(c->stdin_fd, 1);
-		close(c->stdin_fd);
-	}
-	if (c->stdout_event != NULL)
-		bufferevent_free(c->stdout_event);
-	if (c->stdout_fd != -1) {
-		setblocking(c->stdout_fd, 1);
-		close(c->stdout_fd);
-	}
-	if (c->stderr_event != NULL)
-		bufferevent_free(c->stderr_event);
-	if (c->stderr_fd != -1) {
-		setblocking(c->stderr_fd, 1);
-		close(c->stderr_fd);
-	}
+	evbuffer_free (c->stdin_data);
+	evbuffer_free (c->stdout_data);
+	evbuffer_free (c->stderr_data);
 
 	status_free_jobs(&c->status_new);
 	status_free_jobs(&c->status_old);
@@ -239,6 +221,9 @@ server_client_callback(int fd, short events, void *data)
 			goto client_lost;
 	}
 
+	server_push_stdout(c);
+	server_push_stderr(c);
+
 	server_update_event(c);
 	return;
 
@@ -602,11 +587,11 @@ server_client_check_exit(struct client *c)
 	if (!(c->flags & CLIENT_EXIT))
 		return;
 
-	if (c->stdout_fd != -1 && c->stdout_event != NULL &&
-	    EVBUFFER_LENGTH(c->stdout_event->output) != 0)
+	if (EVBUFFER_LENGTH(c->stdin_data) != 0)
+		return;
+	if (EVBUFFER_LENGTH(c->stdout_data) != 0)
 		return;
-	if (c->stderr_fd != -1 && c->stderr_event != NULL &&
-	    EVBUFFER_LENGTH(c->stderr_event->output) != 0)
+	if (EVBUFFER_LENGTH(c->stderr_data) != 0)
 		return;
 
 	exitdata.retcode = c->retcode;
@@ -685,55 +670,6 @@ server_client_set_title(struct client *c)
 	xfree(title);
 }
 
-/*
- * Error callback for client stdin. Caller must increase reference count when
- * enabling event!
- */
-void
-server_client_in_callback(
-    unused struct bufferevent *bufev, unused short what, void *data)
-{
-	struct client	*c = data;
-
-	c->references--;
-	if (c->flags & CLIENT_DEAD)
-		return;
-
-	bufferevent_disable(c->stdin_event, EV_READ|EV_WRITE);
-	setblocking(c->stdin_fd, 1);
-	close(c->stdin_fd);
-	c->stdin_fd = -1;
-
-	if (c->stdin_callback != NULL)
-		c->stdin_callback(c, c->stdin_data);
-}
-
-/* Error callback for client stdout. */
-void
-server_client_out_callback(
-    unused struct bufferevent *bufev, unused short what, unused void *data)
-{
-	struct client	*c = data;
-
-	bufferevent_disable(c->stdout_event, EV_READ|EV_WRITE);
-	setblocking(c->stdout_fd, 1);
-	close(c->stdout_fd);
-	c->stdout_fd = -1;
-}
-
-/* Error callback for client stderr. */
-void
-server_client_err_callback(
-    unused struct bufferevent *bufev, unused short what, unused void *data)
-{
-	struct client	*c = data;
-
-	bufferevent_disable(c->stderr_event, EV_READ|EV_WRITE);
-	setblocking(c->stderr_fd, 1);
-	close(c->stderr_fd);
-	c->stderr_fd = -1;
-}
-
 /* Dispatch message from client. */
 int
 server_client_msg_dispatch(struct client *c)
@@ -742,6 +678,7 @@ server_client_msg_dispatch(struct client *c)
 	struct msg_command_data	 commanddata;
 	struct msg_identify_data identifydata;
 	struct msg_environ_data	 environdata;
+	struct msg_stdin_data	 stdindata;
 	ssize_t			 n, datalen;
 
 	if ((n = imsg_read(&c->ibuf)) == -1 || n == 0)
@@ -777,42 +714,23 @@ server_client_msg_dispatch(struct client *c)
 				fatalx("MSG_IDENTIFY missing fd");
 			memcpy(&identifydata, imsg.data, sizeof identifydata);
 
-			c->stdin_fd = imsg.fd;
-			c->stdin_event = bufferevent_new(c->stdin_fd,
-			    NULL, NULL, server_client_in_callback, c);
-			if (c->stdin_event == NULL)
-				fatalx("failed to create stdin event");
-			setblocking(c->stdin_fd, 0);
-
 			server_client_msg_identify(c, &identifydata, imsg.fd);
 			break;
-		case MSG_STDOUT:
-			if (datalen != 0)
-				fatalx("bad MSG_STDOUT size");
-			if (imsg.fd == -1)
-				fatalx("MSG_STDOUT missing fd");
-
-			c->stdout_fd = imsg.fd;
-			c->stdout_event = bufferevent_new(c->stdout_fd,
-			    NULL, NULL, server_client_out_callback, c);
-			if (c->stdout_event == NULL)
-				fatalx("failed to create stdout event");
-			setblocking(c->stdout_fd, 0);
-
-			break;
-		case MSG_STDERR:
-			if (datalen != 0)
-				fatalx("bad MSG_STDERR size");
-			if (imsg.fd == -1)
-				fatalx("MSG_STDERR missing fd");
-
-			c->stderr_fd = imsg.fd;
-			c->stderr_event = bufferevent_new(c->stderr_fd,
-			    NULL, NULL, server_client_err_callback, c);
-			if (c->stderr_event == NULL)
-				fatalx("failed to create stderr event");
-			setblocking(c->stderr_fd, 0);
+		case MSG_STDIN:
+			if (datalen != sizeof stdindata)
+				fatalx("bad MSG_STDIN size");
+			memcpy(&stdindata, imsg.data, sizeof stdindata);
 
+			if (c->stdin_callback == NULL)
+				break;
+			if (stdindata.size <= 0)
+				c->stdin_closed = 1;
+			else {
+				evbuffer_add(c->stdin_data, stdindata.data,
+				    stdindata.size);
+			}
+			c->stdin_callback(c, c->stdin_closed,
+			    c->stdin_callback_data);
 			break;
 		case MSG_RESIZE:
 			if (datalen != 0)
@@ -879,10 +797,11 @@ server_client_msg_error(struct cmd_ctx *ctx, const char *fmt, ...)
 	va_list	ap;
 
 	va_start(ap, fmt);
-	evbuffer_add_vprintf(ctx->cmdclient->stderr_event->output, fmt, ap);
+	evbuffer_add_vprintf(ctx->cmdclient->stderr_data, fmt, ap);
 	va_end(ap);
 
-	bufferevent_write(ctx->cmdclient->stderr_event, "\n", 1);
+	evbuffer_add(ctx->cmdclient->stderr_data, "\n", 1);
+	server_push_stderr(ctx->cmdclient);
 	ctx->cmdclient->retcode = 1;
 }
 
@@ -893,10 +812,11 @@ server_client_msg_print(struct cmd_ctx *ctx, const char *fmt, ...)
 	va_list	ap;
 
 	va_start(ap, fmt);
-	evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
+	evbuffer_add_vprintf(ctx->cmdclient->stdout_data, fmt, ap);
 	va_end(ap);
 
-	bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
+	evbuffer_add(ctx->cmdclient->stdout_data, "\n", 1);
+	server_push_stdout(ctx->cmdclient);
 }
 
 /* Callback to send print message to client, if not quiet. */
@@ -909,10 +829,11 @@ server_client_msg_info(struct cmd_ctx *ctx, const char *fmt, ...)
 		return;
 
 	va_start(ap, fmt);
-	evbuffer_add_vprintf(ctx->cmdclient->stdout_event->output, fmt, ap);
+	evbuffer_add_vprintf(ctx->cmdclient->stdout_data, fmt, ap);
 	va_end(ap);
 
-	bufferevent_write(ctx->cmdclient->stdout_event, "\n", 1);
+	evbuffer_add(ctx->cmdclient->stdout_data, "\n", 1);
+	server_push_stdout(ctx->cmdclient);
 }
 
 /* Handle command message. */
@@ -969,8 +890,6 @@ void
 server_client_msg_identify(
     struct client *c, struct msg_identify_data *data, int fd)
 {
-	int	tty_fd;
-
 	c->cwd = NULL;
 	data->cwd[(sizeof data->cwd) - 1] = '\0';
 	if (*data->cwd != '\0')
@@ -978,10 +897,8 @@ server_client_msg_identify(
 
 	if (!isatty(fd))
 	    return;
-	if ((tty_fd = dup(fd)) == -1)
-		fatal("dup failed");
 	data->term[(sizeof data->term) - 1] = '\0';
-	tty_init(&c->tty, tty_fd, data->term);
+	tty_init(&c->tty, fd, data->term);
 	if (data->flags & IDENTIFY_UTF8)
 		c->tty.flags |= TTY_UTF8;
 	if (data->flags & IDENTIFY_256COLOURS)