summaryrefslogtreecommitdiffstats
path: root/arch/um/drivers/xterm.c
blob: b530f1a6540d506a556e38c90dc3afec63f2f7f6 (plain)
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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/* 
 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <termios.h>
#include <signal.h>
#include <sched.h>
#include <sys/socket.h>
#include "kern_util.h"
#include "chan_user.h"
#include "user_util.h"
#include "user.h"
#include "os.h"
#include "xterm.h"

struct xterm_chan {
	int pid;
	int helper_pid;
	char *title;
	int device;
	int raw;
	struct termios tt;
	unsigned long stack;
	int direct_rcv;
};

/* Not static because it's called directly by the tt mode gdb code */
void *xterm_init(char *str, int device, struct chan_opts *opts)
{
	struct xterm_chan *data;

	data = malloc(sizeof(*data));
	if(data == NULL) return(NULL);
	*data = ((struct xterm_chan) { .pid 		= -1, 
				       .helper_pid 	= -1,
				       .device 		= device, 
				       .title 		= opts->xterm_title,
				       .raw  		= opts->raw,
				       .stack 		= opts->tramp_stack,
				       .direct_rcv 	= !opts->in_kernel } );
	return(data);
}

/* Only changed by xterm_setup, which is a setup */
static char *terminal_emulator = "xterm";
static char *title_switch = "-T";
static char *exec_switch = "-e";

static int __init xterm_setup(char *line, int *add)
{
	*add = 0;
	terminal_emulator = line;

	line = strchr(line, ',');
	if(line == NULL) return(0);
	*line++ = '\0';
	if(*line) title_switch = line;

	line = strchr(line, ',');
	if(line == NULL) return(0);
	*line++ = '\0';
	if(*line) exec_switch = line;

	return(0);
}

__uml_setup("xterm=", xterm_setup,
"xterm=<terminal emulator>,<title switch>,<exec switch>\n"
"    Specifies an alternate terminal emulator to use for the debugger,\n"
"    consoles, and serial lines when they are attached to the xterm channel.\n"
"    The values are the terminal emulator binary, the switch it uses to set\n"
"    its title, and the switch it uses to execute a subprocess,\n"
"    respectively.  The title switch must have the form '<switch> title',\n"
"    not '<switch>=title'.  Similarly, the exec switch must have the form\n"
"    '<switch> command arg1 arg2 ...'.\n"
"    The default values are 'xterm=xterm,-T,-e'.  Values for gnome-terminal\n"
"    are 'xterm=gnome-terminal,-t,-x'.\n\n"
);

/* XXX This badly needs some cleaning up in the error paths
 * Not static because it's called directly by the tt mode gdb code
 */
int xterm_open(int input, int output, int primary, void *d,
		      char **dev_out)
{
	struct xterm_chan *data = d;
	unsigned long stack;
	int pid, fd, new, err;
	char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
	char *argv[] = { terminal_emulator, title_switch, title, exec_switch, 
			 "/usr/lib/uml/port-helper", "-uml-socket",
			 file, NULL };

	if(os_access(argv[4], OS_ACC_X_OK) < 0)
		argv[4] = "port-helper";

	/* Check that DISPLAY is set, this doesn't guarantee the xterm
	 * will work but w/o it we can be pretty sure it won't. */
	if (!getenv("DISPLAY")) {
		printk("xterm_open: $DISPLAY not set.\n");
		return -ENODEV;
	}

	fd = mkstemp(file);
	if(fd < 0){
		err = -errno;
		printk("xterm_open : mkstemp failed, errno = %d\n", errno);
		return err;
	}

	if(unlink(file)){
		err = -errno;
		printk("xterm_open : unlink failed, errno = %d\n", errno);
		return err;
	}
	os_close_file(fd);

	fd = os_create_unix_socket(file, sizeof(file), 1);
	if(fd < 0){
		printk("xterm_open : create_unix_socket failed, errno = %d\n", 
		       -fd);
		return(fd);
	}

	sprintf(title, data->title, data->device);
	stack = data->stack;
	pid = run_helper(NULL, NULL, argv, &stack);
	if(pid < 0){
		printk("xterm_open : run_helper failed, errno = %d\n", -pid);
		return(pid);
	}

	if(data->stack == 0) free_stack(stack, 0);

	if (data->direct_rcv) {
		new = os_rcv_fd(fd, &data->helper_pid);
	} else {
		err = os_set_fd_block(fd, 0);
		if(err < 0){
			printk("xterm_open : failed to set descriptor "
			       "non-blocking, err = %d\n", -err);
			return(err);
		}
		new = xterm_fd(fd, &data->helper_pid);
	}
	if(new < 0){
		printk("xterm_open : os_rcv_fd failed, err = %d\n", -new);
		goto out;
	}

	CATCH_EINTR(err = tcgetattr(new, &data->tt));
	if(err){
		new = err;
		goto out;
	}

	if(data->raw){
		err = raw(new);
		if(err){
			new = err;
			goto out;
		}
	}

	data->pid = pid;
	*dev_out = NULL;
 out:
	unlink(file);
	return(new);
}

/* Not static because it's called directly by the tt mode gdb code */
void xterm_close(int fd, void *d)
{
	struct xterm_chan *data = d;
	
	if(data->pid != -1) 
		os_kill_process(data->pid, 1);
	data->pid = -1;
	if(data->helper_pid != -1) 
		os_kill_process(data->helper_pid, 0);
	data->helper_pid = -1;
	os_close_file(fd);
}

static void xterm_free(void *d)
{
	free(d);
}

static int xterm_console_write(int fd, const char *buf, int n, void *d)
{
	struct xterm_chan *data = d;

	return(generic_console_write(fd, buf, n, &data->tt));
}

struct chan_ops xterm_ops = {
	.type		= "xterm",
	.init		= xterm_init,
	.open		= xterm_open,
	.close		= xterm_close,
	.read		= generic_read,
	.write		= generic_write,
	.console_write	= xterm_console_write,
	.window_size	= generic_window_size,
	.free		= xterm_free,
	.winch		= 1,
};

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */
OpenPOWER on IntegriCloud