tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <stdio.h>
7#include <unistd.h>
8#include <string.h>
9#include <errno.h>
10#include <termios.h>
11#include "chan_user.h"
12#include "user.h"
13#include "user_util.h"
14#include "kern_util.h"
15#include "os.h"
16
17struct pty_chan {
18 void (*announce)(char *dev_name, int dev);
19 int dev;
20 int raw;
21 struct termios tt;
22 char dev_name[sizeof("/dev/pts/0123456\0")];
23};
24
25static void *pty_chan_init(char *str, int device, struct chan_opts *opts)
26{
27 struct pty_chan *data;
28
29 data = um_kmalloc(sizeof(*data));
30 if(data == NULL) return(NULL);
31 *data = ((struct pty_chan) { .announce = opts->announce,
32 .dev = device,
33 .raw = opts->raw });
34 return(data);
35}
36
37static int pts_open(int input, int output, int primary, void *d,
38 char **dev_out)
39{
40 struct pty_chan *data = d;
41 char *dev;
42 int fd, err;
43
44 fd = get_pty();
45 if(fd < 0){
46 printk("open_pts : Failed to open pts\n");
47 return(-errno);
48 }
49 if(data->raw){
50 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
51 if(err)
52 return(err);
53
54 err = raw(fd);
55 if(err)
56 return(err);
57 }
58
59 dev = ptsname(fd);
60 sprintf(data->dev_name, "%s", dev);
61 *dev_out = data->dev_name;
62 if (data->announce)
63 (*data->announce)(dev, data->dev);
64 return(fd);
65}
66
67static int getmaster(char *line)
68{
69 char *pty, *bank, *cp;
70 int master, err;
71
72 pty = &line[strlen("/dev/ptyp")];
73 for (bank = "pqrs"; *bank; bank++) {
74 line[strlen("/dev/pty")] = *bank;
75 *pty = '0';
76 if (os_stat_file(line, NULL) < 0)
77 break;
78 for (cp = "0123456789abcdef"; *cp; cp++) {
79 *pty = *cp;
80 master = os_open_file(line, of_rdwr(OPENFLAGS()), 0);
81 if (master >= 0) {
82 char *tp = &line[strlen("/dev/")];
83
84 /* verify slave side is usable */
85 *tp = 't';
86 err = os_access(line, OS_ACC_RW_OK);
87 *tp = 'p';
88 if(err == 0) return(master);
89 (void) os_close_file(master);
90 }
91 }
92 }
93 return(-1);
94}
95
96static int pty_open(int input, int output, int primary, void *d,
97 char **dev_out)
98{
99 struct pty_chan *data = d;
100 int fd, err;
101 char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
102
103 fd = getmaster(dev);
104 if(fd < 0)
105 return(-errno);
106
107 if(data->raw){
108 err = raw(fd);
109 if(err)
110 return(err);
111 }
112
113 if(data->announce) (*data->announce)(dev, data->dev);
114
115 sprintf(data->dev_name, "%s", dev);
116 *dev_out = data->dev_name;
117 return(fd);
118}
119
120static int pty_console_write(int fd, const char *buf, int n, void *d)
121{
122 struct pty_chan *data = d;
123
124 return(generic_console_write(fd, buf, n, &data->tt));
125}
126
127struct chan_ops pty_ops = {
128 .type = "pty",
129 .init = pty_chan_init,
130 .open = pty_open,
131 .close = generic_close,
132 .read = generic_read,
133 .write = generic_write,
134 .console_write = pty_console_write,
135 .window_size = generic_window_size,
136 .free = generic_free,
137 .winch = 0,
138};
139
140struct chan_ops pts_ops = {
141 .type = "pts",
142 .init = pty_chan_init,
143 .open = pts_open,
144 .close = generic_close,
145 .read = generic_read,
146 .write = generic_write,
147 .console_write = pty_console_write,
148 .window_size = generic_window_size,
149 .free = generic_free,
150 .winch = 0,
151};
152
153/*
154 * Overrides for Emacs so that we follow Linus's tabbing style.
155 * Emacs will notice this stuff at the end of the file and automatically
156 * adjust the settings for this buffer only. This must remain at the end
157 * of the file.
158 * ---------------------------------------------------------------------------
159 * Local variables:
160 * c-file-style: "linux"
161 * End:
162 */