1
2
3
4
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <unistd.h>
9#include <errno.h>
10#include <fcntl.h>
11#include <string.h>
12#include <termios.h>
13#include <sys/stat.h>
14#include "chan_user.h"
15#include "kern_constants.h"
16#include "os.h"
17#include "um_malloc.h"
18#include "user.h"
19
20struct pty_chan {
21 void (*announce)(char *dev_name, int dev);
22 int dev;
23 int raw;
24 struct termios tt;
25 char dev_name[sizeof("/dev/pts/0123456\0")];
26};
27
28static void *pty_chan_init(char *str, int device, const struct chan_opts *opts)
29{
30 struct pty_chan *data;
31
32 data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
33 if (data == NULL)
34 return NULL;
35
36 *data = ((struct pty_chan) { .announce = opts->announce,
37 .dev = device,
38 .raw = opts->raw });
39 return data;
40}
41
42static int pts_open(int input, int output, int primary, void *d,
43 char **dev_out)
44{
45 struct pty_chan *data = d;
46 char *dev;
47 int fd, err;
48
49 fd = get_pty();
50 if (fd < 0) {
51 err = -errno;
52 printk(UM_KERN_ERR "open_pts : Failed to open pts\n");
53 return err;
54 }
55
56 if (data->raw) {
57 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
58 if (err)
59 goto out_close;
60
61 err = raw(fd);
62 if (err)
63 goto out_close;
64 }
65
66 dev = ptsname(fd);
67 sprintf(data->dev_name, "%s", dev);
68 *dev_out = data->dev_name;
69
70 if (data->announce)
71 (*data->announce)(dev, data->dev);
72
73 return fd;
74
75out_close:
76 close(fd);
77 return err;
78}
79
80static int getmaster(char *line)
81{
82 struct stat buf;
83 char *pty, *bank, *cp;
84 int master, err;
85
86 pty = &line[strlen("/dev/ptyp")];
87 for (bank = "pqrs"; *bank; bank++) {
88 line[strlen("/dev/pty")] = *bank;
89 *pty = '0';
90
91 if ((stat(line, &buf) < 0) && (errno == ENOENT))
92 break;
93
94 for (cp = "0123456789abcdef"; *cp; cp++) {
95 *pty = *cp;
96 master = open(line, O_RDWR);
97 if (master >= 0) {
98 char *tp = &line[strlen("/dev/")];
99
100
101 *tp = 't';
102 err = access(line, R_OK | W_OK);
103 *tp = 'p';
104 if (!err)
105 return master;
106 close(master);
107 }
108 }
109 }
110
111 printk(UM_KERN_ERR "getmaster - no usable host pty devices\n");
112 return -ENOENT;
113}
114
115static int pty_open(int input, int output, int primary, void *d,
116 char **dev_out)
117{
118 struct pty_chan *data = d;
119 int fd, err;
120 char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
121
122 fd = getmaster(dev);
123 if (fd < 0)
124 return fd;
125
126 if (data->raw) {
127 err = raw(fd);
128 if (err) {
129 close(fd);
130 return err;
131 }
132 }
133
134 if (data->announce)
135 (*data->announce)(dev, data->dev);
136
137 sprintf(data->dev_name, "%s", dev);
138 *dev_out = data->dev_name;
139
140 return fd;
141}
142
143const struct chan_ops pty_ops = {
144 .type = "pty",
145 .init = pty_chan_init,
146 .open = pty_open,
147 .close = generic_close,
148 .read = generic_read,
149 .write = generic_write,
150 .console_write = generic_console_write,
151 .window_size = generic_window_size,
152 .free = generic_free,
153 .winch = 0,
154};
155
156const struct chan_ops pts_ops = {
157 .type = "pts",
158 .init = pty_chan_init,
159 .open = pts_open,
160 .close = generic_close,
161 .read = generic_read,
162 .write = generic_write,
163 .console_write = generic_console_write,
164 .window_size = generic_window_size,
165 .free = generic_free,
166 .winch = 0,
167};
168
