1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6 #include <stddef.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <unistd.h>
10 #include <errno.h>
11 #include <string.h>
12 #include <termios.h>
13 #include "chan_user.h"
14 #include <os.h>
15 #include <um_malloc.h>
16 #include "xterm.h"
17
18 struct xterm_chan {
19 int pid;
20 int helper_pid;
21 char *title;
22 int device;
23 int raw;
24 struct termios tt;
25 };
26
xterm_init(char * str,int device,const struct chan_opts * opts)27 static void *xterm_init(char *str, int device, const struct chan_opts *opts)
28 {
29 struct xterm_chan *data;
30
31 data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
32 if (data == NULL)
33 return NULL;
34 *data = ((struct xterm_chan) { .pid = -1,
35 .helper_pid = -1,
36 .device = device,
37 .title = opts->xterm_title,
38 .raw = opts->raw } );
39 return data;
40 }
41
42 /* Only changed by xterm_setup, which is a setup */
43 static char *terminal_emulator = "xterm";
44 static char *title_switch = "-T";
45 static char *exec_switch = "-e";
46
xterm_setup(char * line,int * add)47 static int __init xterm_setup(char *line, int *add)
48 {
49 *add = 0;
50 terminal_emulator = line;
51
52 line = strchr(line, ',');
53 if (line == NULL)
54 return 0;
55
56 *line++ = '\0';
57 if (*line)
58 title_switch = line;
59
60 line = strchr(line, ',');
61 if (line == NULL)
62 return 0;
63
64 *line++ = '\0';
65 if (*line)
66 exec_switch = line;
67
68 return 0;
69 }
70
71 __uml_setup("xterm=", xterm_setup,
72 "xterm=<terminal emulator>,<title switch>,<exec switch>\n"
73 " Specifies an alternate terminal emulator to use for the debugger,\n"
74 " consoles, and serial lines when they are attached to the xterm channel.\n"
75 " The values are the terminal emulator binary, the switch it uses to set\n"
76 " its title, and the switch it uses to execute a subprocess,\n"
77 " respectively. The title switch must have the form '<switch> title',\n"
78 " not '<switch>=title'. Similarly, the exec switch must have the form\n"
79 " '<switch> command arg1 arg2 ...'.\n"
80 " The default values are 'xterm=xterm,-T,-e'. Values for gnome-terminal\n"
81 " are 'xterm=gnome-terminal,-t,-x'.\n\n"
82 );
83
xterm_open(int input,int output,int primary,void * d,char ** dev_out)84 static int xterm_open(int input, int output, int primary, void *d,
85 char **dev_out)
86 {
87 struct xterm_chan *data = d;
88 int pid, fd, new, err;
89 char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
90 char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
91 OS_LIB_PATH "/uml/port-helper", "-uml-socket",
92 file, NULL };
93
94 if (access(argv[4], X_OK) < 0)
95 argv[4] = "port-helper";
96
97 /*
98 * Check that DISPLAY is set, this doesn't guarantee the xterm
99 * will work but w/o it we can be pretty sure it won't.
100 */
101 if (getenv("DISPLAY") == NULL) {
102 printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
103 return -ENODEV;
104 }
105
106 /*
107 * This business of getting a descriptor to a temp file,
108 * deleting the file and closing the descriptor is just to get
109 * a known-unused name for the Unix socket that we really
110 * want.
111 */
112 fd = mkstemp(file);
113 if (fd < 0) {
114 err = -errno;
115 printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
116 errno);
117 return err;
118 }
119
120 if (unlink(file)) {
121 err = -errno;
122 printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
123 errno);
124 close(fd);
125 return err;
126 }
127 close(fd);
128
129 fd = os_create_unix_socket(file, sizeof(file), 1);
130 if (fd < 0) {
131 printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
132 "errno = %d\n", -fd);
133 return fd;
134 }
135
136 sprintf(title, data->title, data->device);
137 pid = run_helper(NULL, NULL, argv);
138 if (pid < 0) {
139 err = pid;
140 printk(UM_KERN_ERR "xterm_open : run_helper failed, "
141 "errno = %d\n", -err);
142 goto out_close1;
143 }
144
145 err = os_set_fd_block(fd, 0);
146 if (err < 0) {
147 printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
148 "non-blocking, err = %d\n", -err);
149 goto out_kill;
150 }
151
152 new = xterm_fd(fd, &data->helper_pid);
153 if (new < 0) {
154 err = new;
155 printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
156 -err);
157 goto out_kill;
158 }
159
160 err = os_set_fd_block(new, 0);
161 if (err) {
162 printk(UM_KERN_ERR "xterm_open : failed to set xterm "
163 "descriptor non-blocking, err = %d\n", -err);
164 goto out_close2;
165 }
166
167 CATCH_EINTR(err = tcgetattr(new, &data->tt));
168 if (err) {
169 new = err;
170 goto out_close2;
171 }
172
173 if (data->raw) {
174 err = raw(new);
175 if (err) {
176 new = err;
177 goto out_close2;
178 }
179 }
180
181 unlink(file);
182 data->pid = pid;
183 *dev_out = NULL;
184
185 return new;
186
187 out_close2:
188 close(new);
189 out_kill:
190 os_kill_process(pid, 1);
191 out_close1:
192 close(fd);
193
194 return err;
195 }
196
xterm_close(int fd,void * d)197 static void xterm_close(int fd, void *d)
198 {
199 struct xterm_chan *data = d;
200
201 if (data->pid != -1)
202 os_kill_process(data->pid, 1);
203 data->pid = -1;
204
205 if (data->helper_pid != -1)
206 os_kill_process(data->helper_pid, 0);
207 data->helper_pid = -1;
208
209 os_close_file(fd);
210 }
211
212 const struct chan_ops xterm_ops = {
213 .type = "xterm",
214 .init = xterm_init,
215 .open = xterm_open,
216 .close = xterm_close,
217 .read = generic_read,
218 .write = generic_write,
219 .console_write = generic_console_write,
220 .window_size = generic_window_size,
221 .free = generic_free,
222 .winch = 1,
223 };
224
