Import tmux

We have to use SOCK_SEQPACKET instead of SOCK_STREAM for client/server
communication, because UDS does things with control messages that tmux
does not expect.

Change-Id: I3edb1875d61fb976cf6485c650f4fd4b82fa354c

external/bsd/tmux/dist/cmd-attach-session.c

@@ -0,0 +1,112 @@
+/* $Id: cmd-attach-session.c,v 1.1.1.2 2011/08/17 18:40:04 jmmv Exp $ */
+
+/*
+ * Copyright (c) 2007 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"
+
+/*
+ * Attach existing session to the current terminal.
+ */
+
+int	cmd_attach_session_exec(struct cmd *, struct cmd_ctx *);
+
+const struct cmd_entry cmd_attach_session_entry = {
+	"attach-session", "attach",
+	"drt:", 0, 0,
+	"[-dr] " CMD_TARGET_SESSION_USAGE,
+	CMD_CANTNEST|CMD_STARTSERVER|CMD_SENDENVIRON,
+	NULL,
+	NULL,
+	cmd_attach_session_exec
+};
+
+int
+cmd_attach_session_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct args	*args = self->args;
+	struct session	*s;
+	struct client	*c;
+	const char	*update;
+	char		*overrides, *cause;
+	u_int		 i;
+
+	if (RB_EMPTY(&sessions)) {
+		ctx->error(ctx, "no sessions");
+		return (-1);
+	}
+
+	if ((s = cmd_find_session(ctx, args_get(args, 't'), 1)) == NULL)
+		return (-1);
+
+	if (ctx->cmdclient == NULL && ctx->curclient == NULL)
+		return (0);
+
+	if (ctx->cmdclient == NULL) {
+		if (args_has(self->args, 'd')) {
+			/*
+			 * Can't use server_write_session in case attaching to
+			 * the same session as currently attached to.
+			 */
+			for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
+				c = ARRAY_ITEM(&clients, i);
+				if (c == NULL || c->session != s)
+					continue;
+				if (c == ctx->curclient)
+					continue;
+				server_write_client(c, MSG_DETACH, NULL, 0);
+			}
+		}
+
+		ctx->curclient->session = s;
+		session_update_activity(s);
+		server_redraw_client(ctx->curclient);
+	} else {
+		if (!(ctx->cmdclient->flags & CLIENT_TERMINAL)) {
+			ctx->error(ctx, "not a terminal");
+			return (-1);
+		}
+
+		overrides =
+		    options_get_string(&s->options, "terminal-overrides");
+		if (tty_open(&ctx->cmdclient->tty, overrides, &cause) != 0) {
+			ctx->error(ctx, "terminal open failed: %s", cause);
+			xfree(cause);
+			return (-1);
+		}
+
+		if (args_has(self->args, 'r'))
+			ctx->cmdclient->flags |= CLIENT_READONLY;
+
+		if (args_has(self->args, 'd'))
+			server_write_session(s, MSG_DETACH, NULL, 0);
+
+		ctx->cmdclient->session = s;
+		session_update_activity(s);
+		server_write_client(ctx->cmdclient, MSG_READY, NULL, 0);
+
+		update = options_get_string(&s->options, "update-environment");
+		environ_update(update, &ctx->cmdclient->environ, &s->environ);
+
+		server_redraw_client(ctx->cmdclient);
+	}
+	recalculate_sizes();
+	server_update_socket();
+
+	return (1);	/* 1 means don't tell command client to exit */
+}