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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
|
/*
* 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles
* or rs-channels. It also implements echoing, cooked mode etc (well,
* not currently, but ...)
*/
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#define ALRMMASK (1<<(SIGALRM-1))
#include <linux/sched.h>
#include <linux/tty.h>
#include <asm/segment.h>
#include <asm/system.h>
#define _L_FLAG(tty,f) ((tty)->termios.c_lflag & f)
#define _I_FLAG(tty,f) ((tty)->termios.c_iflag & f)
#define _O_FLAG(tty,f) ((tty)->termios.c_oflag & f)
#define L_CANON(tty) _L_FLAG((tty),ICANON)
#define L_ISIG(tty) _L_FLAG((tty),ISIG)
#define L_ECHO(tty) _L_FLAG((tty),ECHO)
#define L_ECHOE(tty) _L_FLAG((tty),ECHOE)
#define L_ECHOK(tty) _L_FLAG((tty),ECHOK)
#define L_ECHOCTL(tty) _L_FLAG((tty),ECHOCTL)
#define L_ECHOKE(tty) _L_FLAG((tty),ECHOKE)
#define I_UCLC(tty) _I_FLAG((tty),IUCLC)
#define I_NLCR(tty) _I_FLAG((tty),INLCR)
#define I_CRNL(tty) _I_FLAG((tty),ICRNL)
#define I_NOCR(tty) _I_FLAG((tty),IGNCR)
#define O_POST(tty) _O_FLAG((tty),OPOST)
#define O_NLCR(tty) _O_FLAG((tty),ONLCR)
#define O_CRNL(tty) _O_FLAG((tty),OCRNL)
#define O_NLRET(tty) _O_FLAG((tty),ONLRET)
#define O_LCUC(tty) _O_FLAG((tty),OLCUC)
struct tty_struct tty_table[] = {
{
{0,
OPOST|ONLCR, /* change outgoing NL to CRNL */
0,
ICANON | ECHO | ECHOCTL | ECHOKE,
0, /* console termio */
INIT_C_CC},
0, /* initial pgrp */
0, /* initial stopped */
con_write,
{0,0,0,0,""}, /* console read-queue */
{0,0,0,0,""}, /* console write-queue */
{0,0,0,0,""} /* console secondary queue */
},{
{0, /*IGNCR*/
OPOST | ONLRET, /* change outgoing NL to CR */
B2400 | CS8,
0,
0,
INIT_C_CC},
0,
0,
rs_write,
{0x3f8,0,0,0,""}, /* rs 1 */
{0x3f8,0,0,0,""},
{0,0,0,0,""}
},{
{0, /*IGNCR*/
OPOST | ONLRET, /* change outgoing NL to CR */
B2400 | CS8,
0,
0,
INIT_C_CC},
0,
0,
rs_write,
{0x2f8,0,0,0,""}, /* rs 2 */
{0x2f8,0,0,0,""},
{0,0,0,0,""}
}
};
/*
* these are the tables used by the machine code handlers.
* you can implement pseudo-tty's or something by changing
* them. Currently not done.
*/
struct tty_queue * table_list[]={
&tty_table[0].read_q, &tty_table[0].write_q,
&tty_table[1].read_q, &tty_table[1].write_q,
&tty_table[2].read_q, &tty_table[2].write_q
};
void tty_init(void)
{
rs_init();
con_init();
}
void tty_intr(struct tty_struct * tty, int signal)
{
int i;
if (tty->pgrp <= 0)
return;
for (i=0;i<NR_TASKS;i++)
if (task[i] && task[i]->pgrp==tty->pgrp)
task[i]->signal |= 1<<(signal-1);
}
static void sleep_if_empty(struct tty_queue * queue)
{
cli();
while (!current->signal && EMPTY(*queue))
interruptible_sleep_on(&queue->proc_list);
sti();
}
static void sleep_if_full(struct tty_queue * queue)
{
if (!FULL(*queue))
return;
cli();
while (!current->signal && LEFT(*queue)<128)
interruptible_sleep_on(&queue->proc_list);
sti();
}
void copy_to_cooked(struct tty_struct * tty)
{
signed char c;
while (!EMPTY(tty->read_q) && !FULL(tty->secondary)) {
GETCH(tty->read_q,c);
if (c==13)
if (I_CRNL(tty))
c=10;
else if (I_NOCR(tty))
continue;
else ;
else if (c==10 && I_NLCR(tty))
c=13;
if (I_UCLC(tty))
c=tolower(c);
if (L_CANON(tty)) {
if (c==ERASE_CHAR(tty)) {
if (EMPTY(tty->secondary) ||
(c=LAST(tty->secondary))==10 ||
c==EOF_CHAR(tty))
continue;
if (L_ECHO(tty)) {
if (c<32)
PUTCH(127,tty->write_q);
PUTCH(127,tty->write_q);
tty->write(tty);
}
DEC(tty->secondary.head);
continue;
}
if (c==STOP_CHAR(tty)) {
tty->stopped=1;
continue;
}
if (c==START_CHAR(tty)) {
tty->stopped=0;
continue;
}
}
if (!L_ISIG(tty)) {
if (c==INTR_CHAR(tty)) {
tty_intr(tty,SIGINT);
continue;
}
}
if (c==10 || c==EOF_CHAR(tty))
tty->secondary.data++;
if (L_ECHO(tty)) {
if (c==10) {
PUTCH(10,tty->write_q);
PUTCH(13,tty->write_q);
} else if (c<32) {
if (L_ECHOCTL(tty)) {
PUTCH('^',tty->write_q);
PUTCH(c+64,tty->write_q);
}
} else
PUTCH(c,tty->write_q);
tty->write(tty);
}
PUTCH(c,tty->secondary);
}
wake_up(&tty->secondary.proc_list);
}
int tty_read(unsigned channel, char * buf, int nr)
{
struct tty_struct * tty;
char c, * b=buf;
int minimum,time,flag=0;
long oldalarm;
if (channel>2 || nr<0) return -1;
tty = &tty_table[channel];
oldalarm = current->alarm;
time = (unsigned) 10*tty->termios.c_cc[VTIME];
minimum = (unsigned) tty->termios.c_cc[VMIN];
if (time && !minimum) {
minimum=1;
if (flag=(!oldalarm || time+jiffies<oldalarm))
current->alarm = time+jiffies;
}
if (minimum>nr)
minimum=nr;
while (nr>0) {
if (flag && (current->signal & ALRMMASK)) {
current->signal &= ~ALRMMASK;
break;
}
if (current->signal)
break;
if (EMPTY(tty->secondary) || (L_CANON(tty) &&
!tty->secondary.data && LEFT(tty->secondary)>20)) {
sleep_if_empty(&tty->secondary);
continue;
}
do {
GETCH(tty->secondary,c);
if (c==EOF_CHAR(tty) || c==10)
tty->secondary.data--;
if (c==EOF_CHAR(tty) && L_CANON(tty))
return (b-buf);
else {
put_fs_byte(c,b++);
if (!--nr)
break;
}
} while (nr>0 && !EMPTY(tty->secondary));
if (time && !L_CANON(tty))
if (flag=(!oldalarm || time+jiffies<oldalarm))
current->alarm = time+jiffies;
else
current->alarm = oldalarm;
if (L_CANON(tty)) {
if (b-buf)
break;
} else if (b-buf >= minimum)
break;
}
current->alarm = oldalarm;
if (current->signal && !(b-buf))
return -EINTR;
return (b-buf);
}
int tty_write(unsigned channel, char * buf, int nr)
{
static cr_flag=0;
struct tty_struct * tty;
char c, *b=buf;
if (channel>2 || nr<0) return -1;
tty = channel + tty_table;
while (nr>0) {
sleep_if_full(&tty->write_q);
if (current->signal)
break;
while (nr>0 && !FULL(tty->write_q)) {
c=get_fs_byte(b);
if (O_POST(tty)) {
if (c=='\r' && O_CRNL(tty))
c='\n';
else if (c=='\n' && O_NLRET(tty))
c='\r';
if (c=='\n' && !cr_flag && O_NLCR(tty)) {
cr_flag = 1;
PUTCH(13,tty->write_q);
continue;
}
if (O_LCUC(tty))
c=toupper(c);
}
b++; nr--;
cr_flag = 0;
PUTCH(c,tty->write_q);
}
tty->write(tty);
if (nr>0)
schedule();
}
return (b-buf);
}
/*
* Jeh, sometimes I really like the 386.
* This routine is called from an interrupt,
* and there should be absolutely no problem
* with sleeping even in an interrupt (I hope).
* Of course, if somebody proves me wrong, I'll
* hate intel for all time :-). We'll have to
* be careful and see to reinstating the interrupt
* chips before calling this, though.
*/
void do_tty_interrupt(int tty)
{
copy_to_cooked(tty_table+tty);
}
|
