1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/* $Id: client-msg.c,v 1.20 2009-07-22 17:38:11 tcunha 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 <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
int client_msg_fn_detach(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_error(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_shutdown(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_exit(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_exited(struct hdr *, struct client_ctx *, char **);
int client_msg_fn_suspend(struct hdr *, struct client_ctx *, char **);
struct client_msg {
enum hdrtype type;
int (*fn)(struct hdr *, struct client_ctx *, char **);
};
struct client_msg client_msg_table[] = {
{ MSG_DETACH, client_msg_fn_detach },
{ MSG_ERROR, client_msg_fn_error },
{ MSG_EXIT, client_msg_fn_exit },
{ MSG_EXITED, client_msg_fn_exited },
{ MSG_SHUTDOWN, client_msg_fn_shutdown },
{ MSG_SUSPEND, client_msg_fn_suspend },
};
int
client_msg_dispatch(struct client_ctx *cctx, char **error)
{
struct hdr hdr;
struct client_msg *msg;
u_int i;
if (BUFFER_USED(cctx->srv_in) < sizeof hdr)
return (1);
memcpy(&hdr, BUFFER_OUT(cctx->srv_in), sizeof hdr);
if (BUFFER_USED(cctx->srv_in) < (sizeof hdr) + hdr.size)
return (1);
buffer_remove(cctx->srv_in, sizeof hdr);
for (i = 0; i < nitems(client_msg_table); i++) {
msg = client_msg_table + i;
if (msg->type == hdr.type) {
if (msg->fn(&hdr, cctx, error) != 0)
return (-1);
return (0);
}
}
fatalx("unexpected message");
}
int
client_msg_fn_error(struct hdr *hdr, struct client_ctx *cctx, char **error)
{
if (hdr->size == SIZE_MAX)
fatalx("bad MSG_ERROR size");
*error = xmalloc(hdr->size + 1);
buffer_read(cctx->srv_in, *error, hdr->size);
(*error)[hdr->size] = '\0';
return (-1);
}
int
client_msg_fn_detach(
struct hdr *hdr, struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_DETACH size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->flags |= CCTX_DETACH;
return (0);
}
int
client_msg_fn_shutdown(
struct hdr *hdr, struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_SHUTDOWN size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->flags |= CCTX_SHUTDOWN;
return (0);
}
int
client_msg_fn_exit(
struct hdr *hdr, struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_EXIT size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->flags |= CCTX_EXIT;
return (0);
}
int
client_msg_fn_exited(
struct hdr *hdr, unused struct client_ctx *cctx, unused char **error)
{
if (hdr->size != 0)
fatalx("bad MSG_EXITED size");
return (-1);
}
int
client_msg_fn_suspend(
struct hdr *hdr, unused struct client_ctx *cctx, unused char **error)
{
struct sigaction act;
if (hdr->size != 0)
fatalx("bad MSG_SUSPEND size");
memset(&act, 0, sizeof act);
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
act.sa_handler = SIG_DFL;
if (sigaction(SIGTSTP, &act, NULL) != 0)
fatal("sigaction failed");
act.sa_handler = sighandler;
if (sigaction(SIGCONT, &act, NULL) != 0)
fatal("sigaction failed");
kill(getpid(), SIGTSTP);
return (0);
}
|