This source file includes following definitions.
- wait_until_sent
- unset_locked_termios
- set_termios
- get_termio
- inq_canon
- n_tty_ioctl
1
2
3
4
5
6
7
8
9
10
11 #include <linux/types.h>
12 #include <linux/termios.h>
13 #include <linux/errno.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/major.h>
17 #include <linux/tty.h>
18 #include <linux/fcntl.h>
19 #include <linux/string.h>
20
21 #include <asm/io.h>
22 #include <asm/bitops.h>
23 #include <asm/segment.h>
24 #include <asm/system.h>
25
26 #undef TTY_DEBUG_WAIT_UNTIL_SENT
27
28 #undef DEBUG
29 #ifdef DEBUG
30 # define PRINTK(x) printk (x)
31 #else
32 # define PRINTK(x)
33 #endif
34
35
36
37
38 #define TERMIOS_FLUSH 1
39 #define TERMIOS_WAIT 2
40 #define TERMIOS_TERMIO 4
41
42 void wait_until_sent(struct tty_struct * tty, int timeout)
43 {
44 struct wait_queue wait = { current, NULL };
45
46 #ifdef TTY_DEBUG_WAIT_UNTIL_SENT
47 printk("%s wait until sent...\n", tty_name(tty));
48 #endif
49 if (!tty->driver.chars_in_buffer ||
50 !tty->driver.chars_in_buffer(tty))
51 return;
52 add_wait_queue(&tty->write_wait, &wait);
53 current->counter = 0;
54 if (timeout)
55 current->timeout = timeout + jiffies;
56 else
57 current->timeout = (unsigned) -1;
58 do {
59 #ifdef TTY_DEBUG_WAIT_UNTIL_SENT
60 printk("waiting %s...(%d)\n", tty_name(tty), tty->driver.chars_in_buffer(tty));
61 #endif
62 current->state = TASK_INTERRUPTIBLE;
63 if (current->signal & ~current->blocked)
64 break;
65 if (!tty->driver.chars_in_buffer(tty))
66 break;
67 schedule();
68 } while (current->timeout);
69 current->state = TASK_RUNNING;
70 remove_wait_queue(&tty->write_wait, &wait);
71 }
72
73 static void unset_locked_termios(struct termios *termios,
74 struct termios *old,
75 struct termios *locked)
76 {
77 int i;
78
79 #define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z)))
80
81 if (!locked) {
82 printk("Warning?!? termios_locked is NULL.\n");
83 return;
84 }
85
86 NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
87 NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
88 NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
89 NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
90 termios->c_line = locked->c_line ? old->c_line : termios->c_line;
91 for (i=0; i < NCCS; i++)
92 termios->c_cc[i] = locked->c_cc[i] ?
93 old->c_cc[i] : termios->c_cc[i];
94 }
95
96 static int set_termios(struct tty_struct * tty, unsigned long arg, int opt)
97 {
98 struct termio tmp_termio;
99 struct termios tmp_termios;
100 struct termios old_termios = *tty->termios;
101 int retval, canon_change;
102
103 retval = tty_check_change(tty);
104 if (retval)
105 return retval;
106
107 if (opt & TERMIOS_TERMIO) {
108 retval = verify_area(VERIFY_READ, (void *) arg, sizeof(struct termio));
109 if (retval)
110 return retval;
111 tmp_termios = *tty->termios;
112 memcpy_fromfs(&tmp_termio, (struct termio *) arg,
113 sizeof (struct termio));
114
115 #define SET_LOW_BITS(x,y) ((x) = (0xffff0000 & (x)) | (y))
116 SET_LOW_BITS(tmp_termios.c_iflag, tmp_termio.c_iflag);
117 SET_LOW_BITS(tmp_termios.c_oflag, tmp_termio.c_oflag);
118 SET_LOW_BITS(tmp_termios.c_cflag, tmp_termio.c_cflag);
119 SET_LOW_BITS(tmp_termios.c_lflag, tmp_termio.c_lflag);
120 memcpy(&tmp_termios.c_cc, &tmp_termio.c_cc, NCC);
121 #undef SET_LOW_BITS
122 } else {
123 retval = verify_area(VERIFY_READ, (void *) arg, sizeof(struct termios));
124 if (retval)
125 return retval;
126 memcpy_fromfs(&tmp_termios, (struct termios *) arg,
127 sizeof (struct termios));
128 }
129
130 if ((opt & TERMIOS_FLUSH) && tty->ldisc.flush_buffer)
131 tty->ldisc.flush_buffer(tty);
132
133 if (opt & TERMIOS_WAIT)
134 wait_until_sent(tty, 0);
135
136 cli();
137 *tty->termios = tmp_termios;
138 unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
139 canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON;
140 if (canon_change) {
141 memset(&tty->read_flags, 0, sizeof tty->read_flags);
142 tty->canon_head = tty->read_tail;
143 tty->canon_data = 0;
144 tty->erasing = 0;
145 }
146 sti();
147 if (canon_change && !L_ICANON(tty) && tty->read_cnt)
148
149 wake_up_interruptible(&tty->read_wait);
150
151
152
153 if (tty->link && tty->link->packet) {
154 int old_flow = ((old_termios.c_iflag & IXON) &&
155 (old_termios.c_cc[VSTOP] == '\023') &&
156 (old_termios.c_cc[VSTART] == '\021'));
157 int new_flow = (I_IXON(tty) &&
158 STOP_CHAR(tty) == '\023' &&
159 START_CHAR(tty) == '\021');
160 if (old_flow != new_flow) {
161 tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
162 if (new_flow)
163 tty->ctrl_status |= TIOCPKT_DOSTOP;
164 else
165 tty->ctrl_status |= TIOCPKT_NOSTOP;
166 wake_up_interruptible(&tty->link->read_wait);
167 }
168 }
169
170 if (tty->driver.set_termios)
171 (*tty->driver.set_termios)(tty, &old_termios);
172
173 if (tty->ldisc.set_termios)
174 (*tty->ldisc.set_termios)(tty, &old_termios);
175
176 return 0;
177 }
178
179 static int get_termio(struct tty_struct * tty, struct termio * termio)
180 {
181 int i;
182 struct termio tmp_termio;
183
184 i = verify_area(VERIFY_WRITE, termio, sizeof (struct termio));
185 if (i)
186 return i;
187 tmp_termio.c_iflag = tty->termios->c_iflag;
188 tmp_termio.c_oflag = tty->termios->c_oflag;
189 tmp_termio.c_cflag = tty->termios->c_cflag;
190 tmp_termio.c_lflag = tty->termios->c_lflag;
191 tmp_termio.c_line = tty->termios->c_line;
192 for(i=0 ; i < NCC ; i++)
193 tmp_termio.c_cc[i] = tty->termios->c_cc[i];
194 memcpy_tofs(termio, &tmp_termio, sizeof (struct termio));
195 return 0;
196 }
197
198 static unsigned long inq_canon(struct tty_struct * tty)
199 {
200 int nr, head, tail;
201
202 if (!tty->canon_data || !tty->read_buf)
203 return 0;
204 head = tty->canon_head;
205 tail = tty->read_tail;
206 nr = (head - tail) & (N_TTY_BUF_SIZE-1);
207
208 while (head != tail) {
209 if (test_bit(tail, &tty->read_flags) &&
210 tty->read_buf[tail] == __DISABLED_CHAR)
211 nr--;
212 tail = (tail+1) & (N_TTY_BUF_SIZE-1);
213 }
214 return nr;
215 }
216
217 int n_tty_ioctl(struct tty_struct * tty, struct file * file,
218 unsigned int cmd, unsigned long arg)
219 {
220 struct tty_struct * real_tty;
221 int retval;
222 int opt = 0;
223
224 if (tty->driver.type == TTY_DRIVER_TYPE_PTY &&
225 tty->driver.subtype == PTY_TYPE_MASTER)
226 real_tty = tty->link;
227 else
228 real_tty = tty;
229
230 switch (cmd) {
231 case TCGETS:
232 retval = verify_area(VERIFY_WRITE, (void *) arg,
233 sizeof (struct termios));
234 if (retval)
235 return retval;
236 memcpy_tofs((struct termios *) arg,
237 real_tty->termios,
238 sizeof (struct termios));
239 return 0;
240 case TCSETSF:
241 opt |= TERMIOS_FLUSH;
242 case TCSETSW:
243 opt |= TERMIOS_WAIT;
244 case TCSETS:
245 return set_termios(real_tty, arg, opt);
246 case TCGETA:
247 return get_termio(real_tty,(struct termio *) arg);
248 case TCSETAF:
249 opt |= TERMIOS_FLUSH;
250 case TCSETAW:
251 opt |= TERMIOS_WAIT;
252 case TCSETA:
253 return set_termios(real_tty, arg, opt|TERMIOS_TERMIO);
254 case TCXONC:
255 retval = tty_check_change(tty);
256 if (retval)
257 return retval;
258 switch (arg) {
259 case TCOOFF:
260 stop_tty(tty);
261 break;
262 case TCOON:
263 start_tty(tty);
264 break;
265 case TCIOFF:
266 if (STOP_CHAR(tty) != __DISABLED_CHAR)
267 tty->driver.write(tty, 0,
268 &STOP_CHAR(tty), 1);
269 break;
270 case TCION:
271 if (START_CHAR(tty) != __DISABLED_CHAR)
272 tty->driver.write(tty, 0,
273 &START_CHAR(tty), 1);
274 break;
275 default:
276 return -EINVAL;
277 }
278 return 0;
279 case TCFLSH:
280 retval = tty_check_change(tty);
281 if (retval)
282 return retval;
283 switch (arg) {
284 case TCIFLUSH:
285 if (tty->ldisc.flush_buffer)
286 tty->ldisc.flush_buffer(tty);
287 break;
288 case TCIOFLUSH:
289 if (tty->ldisc.flush_buffer)
290 tty->ldisc.flush_buffer(tty);
291
292 case TCOFLUSH:
293 if (tty->driver.flush_buffer)
294 tty->driver.flush_buffer(tty);
295 break;
296 default:
297 return -EINVAL;
298 }
299 return 0;
300 case TIOCOUTQ:
301 retval = verify_area(VERIFY_WRITE, (void *) arg,
302 sizeof (unsigned long));
303 if (retval)
304 return retval;
305 if (tty->driver.chars_in_buffer)
306 put_fs_long(tty->driver.chars_in_buffer(tty),
307 (unsigned long *) arg);
308 else
309 put_fs_long(0, (unsigned long *) arg);
310 return 0;
311 case TIOCINQ:
312 retval = verify_area(VERIFY_WRITE, (void *) arg,
313 sizeof (unsigned long));
314 if (retval)
315 return retval;
316 if (L_ICANON(tty))
317 put_fs_long(inq_canon(tty),
318 (unsigned long *) arg);
319 else
320 put_fs_long(tty->read_cnt,
321 (unsigned long *) arg);
322 return 0;
323 case TIOCGLCKTRMIOS:
324 retval = verify_area(VERIFY_WRITE, (void *) arg,
325 sizeof (struct termios));
326 if (retval)
327 return retval;
328 memcpy_tofs((struct termios *) arg,
329 real_tty->termios_locked,
330 sizeof (struct termios));
331 return 0;
332 case TIOCSLCKTRMIOS:
333 if (!suser())
334 return -EPERM;
335 retval = verify_area(VERIFY_READ, (void *) arg,
336 sizeof (struct termios));
337 if (retval)
338 return retval;
339 memcpy_fromfs(real_tty->termios_locked,
340 (struct termios *) arg,
341 sizeof (struct termios));
342 return 0;
343 case TIOCPKT:
344 if (tty->driver.type != TTY_DRIVER_TYPE_PTY ||
345 tty->driver.subtype != PTY_TYPE_MASTER)
346 return -ENOTTY;
347 retval = verify_area(VERIFY_READ, (void *) arg,
348 sizeof (unsigned long));
349 if (retval)
350 return retval;
351 if (get_fs_long(arg)) {
352 if (!tty->packet) {
353 tty->packet = 1;
354 tty->link->ctrl_status = 0;
355 }
356 } else
357 tty->packet = 0;
358 return 0;
359
360
361 case TCSBRK: case TCSBRKP:
362 retval = tty_check_change(tty);
363 if (retval)
364 return retval;
365 wait_until_sent(tty, 0);
366 if (!tty->driver.ioctl)
367 return 0;
368 tty->driver.ioctl(tty, file, cmd, arg);
369 return 0;
370 default:
371 return -ENOIOCTLCMD;
372 }
373 }
![[first]](../icons/first.png){kind=icon}
![[previous]](../icons/n_left.png){kind=icon}
![[next]](../icons/n_right.png){kind=icon}
![[last]](../icons/last.png){kind=icon}
![[top]](../icons/n_top.png){kind=icon}
![[bottom]](../icons/bottom.png){kind=icon}
![[index]](../icons/index.png){kind=icon}
![[help]](../icons/help.png){kind=icon}
*/
![[next]](../icons/right.png)
![[first]](../icons/n_first.png)
![[top]](../icons/top.png)
![[previous]](../icons/left.png)
![[last]](../icons/n_last.png)
![[bottom]](../icons/n_bottom.png){kind=icon}