Sync OpenBSD patchset 353:

New lock-client and lock-session commands to lock an individual client or all
clients attached to a session respectively.

cmd-lock-session.c

@@ -0,0 +1,53 @@
+/* $Id: cmd-lock-session.c,v 1.1 2009-09-25 17:51:39 tcunha Exp $ */
+
+/*
+ * Copyright (c) 2009 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"
+
+/*
+ * Lock all clients attached to a session.
+ */
+
+int	cmd_lock_session_exec(struct cmd *, struct cmd_ctx *);
+
+const struct cmd_entry cmd_lock_session_entry = {
+	"lock-session", "locks",
+	CMD_TARGET_SESSION_USAGE,
+	0, 0,
+	cmd_target_init,
+	cmd_target_parse,
+	cmd_lock_session_exec,
+	cmd_target_free,
+	cmd_target_print
+};
+
+int
+cmd_lock_session_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct cmd_target_data	*data = self->data;
+	struct session		*s;
+
+	if ((s = cmd_find_session(ctx, data->target)) == NULL)
+		return (-1);
+
+	server_lock_session(s);
+	recalculate_sizes();
+
+	return (0);
+}