1 /* $Id: cmd-attach-session.c,v 1.1.1.2 2011/08/17 18:40:04 jmmv Exp $ */
2 
3 /*
4  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include <sys/types.h>
20 
21 #include "tmux.h"
22 
23 /*
24  * Attach existing session to the current terminal.
25  */
26 
27 int	cmd_attach_session_exec(struct cmd *, struct cmd_ctx *);
28 
29 const struct cmd_entry cmd_attach_session_entry = {
30 	"attach-session", "attach",
31 	"drt:", 0, 0,
32 	"[-dr] " CMD_TARGET_SESSION_USAGE,
33 	CMD_CANTNEST|CMD_STARTSERVER|CMD_SENDENVIRON,
34 	NULL,
35 	NULL,
36 	cmd_attach_session_exec
37 };
38 
39 int
40 cmd_attach_session_exec(struct cmd *self, struct cmd_ctx *ctx)
41 {
42 	struct args	*args = self->args;
43 	struct session	*s;
44 	struct client	*c;
45 	const char	*update;
46 	char		*overrides, *cause;
47 	u_int		 i;
48 
49 	if (RB_EMPTY(&sessions)) {
50 		ctx->error(ctx, "no sessions");
51 		return (-1);
52 	}
53 
54 	if ((s = cmd_find_session(ctx, args_get(args, 't'), 1)) == NULL)
55 		return (-1);
56 
57 	if (ctx->cmdclient == NULL && ctx->curclient == NULL)
58 		return (0);
59 
60 	if (ctx->cmdclient == NULL) {
61 		if (args_has(self->args, 'd')) {
62 			/*
63 			 * Can't use server_write_session in case attaching to
64 			 * the same session as currently attached to.
65 			 */
66 			for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
67 				c = ARRAY_ITEM(&clients, i);
68 				if (c == NULL || c->session != s)
69 					continue;
70 				if (c == ctx->curclient)
71 					continue;
72 				server_write_client(c, MSG_DETACH, NULL, 0);
73 			}
74 		}
75 
76 		ctx->curclient->session = s;
77 		session_update_activity(s);
78 		server_redraw_client(ctx->curclient);
79 	} else {
80 		if (!(ctx->cmdclient->flags & CLIENT_TERMINAL)) {
81 			ctx->error(ctx, "not a terminal");
82 			return (-1);
83 		}
84 
85 		overrides =
86 		    options_get_string(&s->options, "terminal-overrides");
87 		if (tty_open(&ctx->cmdclient->tty, overrides, &cause) != 0) {
88 			ctx->error(ctx, "terminal open failed: %s", cause);
89 			xfree(cause);
90 			return (-1);
91 		}
92 
93 		if (args_has(self->args, 'r'))
94 			ctx->cmdclient->flags |= CLIENT_READONLY;
95 
96 		if (args_has(self->args, 'd'))
97 			server_write_session(s, MSG_DETACH, NULL, 0);
98 
99 		ctx->cmdclient->session = s;
100 		session_update_activity(s);
101 		server_write_client(ctx->cmdclient, MSG_READY, NULL, 0);
102 
103 		update = options_get_string(&s->options, "update-environment");
104 		environ_update(update, &ctx->cmdclient->environ, &s->environ);
105 
106 		server_redraw_client(ctx->cmdclient);
107 	}
108 	recalculate_sizes();
109 	server_update_socket();
110 
111 	return (1);	/* 1 means don't tell command client to exit */
112 }
113