summaryrefslogtreecommitdiff
path: root/term/term.h
blob: c89e44255127d7f867e22f164dff0c0b96c2d968 (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
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
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
/*
   Copyright (C) 1995,96,98,99, 2002 Free Software Foundation, Inc.
   Written by Michael I. Bushnell, p/BSG.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */

#include <cthreads.h>
#include <assert.h>
#include <errno.h>
#include <hurd/trivfs.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <hurd/hurd_types.h>

#undef MDMBUF
#undef ECHO
#undef TOSTOP
#undef FLUSHO
#undef PENDIN
#undef NOFLSH
#include <termios.h>

#define CHAR_EOT '\004'		/* C-d */
#define CHAR_DC1 '\021'		/* C-q */
#define CHAR_DC2 '\022'		/* C-r */
#define CHAR_DC3 '\023'		/* C-s */
#define CHAR_USER_QUOTE '\377'	/* break quoting, etc. */

/* This bit specifies control */
#define CTRL_BIT 0x40

/* XXX These belong in <termios.h> */
#ifdef	IUCLC
#define ILCASE	IUCLC
#else
#define ILCASE (1 << 14)
#endif
#ifdef	OLCUC
#define OLCASE	OLCUC
#else
#define OLCASE (1 << 9)
#endif
#define OTILDE (1 << 10)

/* used in mdmctl device call */
#define MDMCTL_BIS 0
#define MDMCTL_BIC 1
#define MDMCTL_SET 2

/* Directly user-visible state */
struct termios termstate;

/* Other state with the following bits: */
long termflags;

#define USER_OUTPUT_SUSP  0x00000001 /* user has suspended output */
#define TTY_OPEN	  0x00000002 /* someone has us open */
#define LAST_SLASH	  0x00000004 /* last input char was \ */
#define LAST_LNEXT        0x00000008 /* last input char was VLNEXT */
#define INSIDE_HDERASE    0x00000010 /* inside \.../ hardcopy erase pair */
#define SENT_VSTOP        0x00000020 /* we've sent VSTOP to IXOFF peer */
#define FLUSH_OUTPUT      0x00000040 /* user wants output flushed */
#define NO_CARRIER        0x00000080 /* carrier is absent */
#define EXCL_USE          0x00000100 /* user accessible exclusive use */
#define NO_OWNER          0x00000200 /* there is no foreground_id */
#define ICKY_ASYNC	  0x00000400 /* some user has set O_ASYNC */

#define QUEUE_LOWAT 100
#define QUEUE_HIWAT 300

/* Global lock */
struct mutex global_lock;

/* Wakeup when NO_CARRIER turns off */
struct condition carrier_alert;

/* Wakeup for select */
struct condition select_alert;

/* Bucket for all our ports. */
struct port_bucket *term_bucket;

/* Port class for tty control ports */
struct port_class *tty_cntl_class;

/* Port class for tty I/O ports */
struct port_class *tty_class;

/* Port class for ctty ID ports */
struct port_class *cttyid_class;

/* Port class for pty master ports */
struct port_class *pty_class;

/* Port class for pty control ports */
struct port_class *pty_cntl_class;

/* Trivfs control structure for the tty */
struct trivfs_control *termctl;

/* Trivfs control structure for the pty */
struct trivfs_control *ptyctl;

/* The queues we use */
struct queue *inputq, *rawq, *outputq;

/* Plain pass-through input */
int remote_input_mode;

/* External processing mode */
int external_processing;

/* Terminal owner */
uid_t term_owner;

/* Terminal group */
uid_t term_group;

/* Terminal mode */
mode_t term_mode;


/* Functions a bottom half defines */
struct bottomhalf
{
  enum term_bottom_type type;
  error_t (*init) (void);
  error_t (*start_output) (void);
  error_t (*set_break) (void);
  error_t (*clear_break) (void);
  error_t (*abandon_physical_output) (void);
  error_t (*suspend_physical_output) (void);
  int (*pending_output_size) (void);
  error_t (*notice_input_flushed) (void);
  error_t (*assert_dtr) (void);
  error_t (*desert_dtr) (void);
  error_t (*set_bits) (struct termios *state);
  error_t (*mdmctl) (int how, int bits);
  error_t (*mdmstate) (int *state);
};

const struct bottomhalf *bottom;
extern const struct bottomhalf devio_bottom, hurdio_bottom, ptyio_bottom;


/* Character queues */
#define QUEUE_QUOTE_MARK 0xf000
typedef short quoted_char;
struct queue
{
  int susp;
  int lowat;
  int hiwat;
  short *cs, *ce;
  int arraylen;
  struct condition *wait;
  quoted_char array[0];
};

struct queue *create_queue (int size, int lowat, int hiwat);

/* Return the number of characters in Q. */
extern inline int
qsize (struct queue *q)
{
  return q->ce - q->cs;
}

/* Return nonzero if characters can be added to Q. */
extern inline int
qavail (struct queue *q)
{
  return !q->susp;
}

/* Flush all the characters from Q. */
extern inline void
clear_queue (struct queue *q)
{
  q->susp = 0;
  q->cs = q->ce = q->array;
  condition_broadcast (q->wait);
}

/* Should be below, but inlines need it. */
void call_asyncs (int dir);

/* Return the next character off Q; leave the quoting bit on. */
extern inline quoted_char
dequeue_quote (struct queue *q)
{
  int beep = 0;

  assert (qsize (q));
  if (q->susp && (qsize (q) < q->lowat))
    {
      q->susp = 0;
      beep = 1;
    }
  if (qsize (q) == 1)
    beep = 1;
  if (beep)
    {
      condition_broadcast (q->wait);
      if (q == outputq)
	call_asyncs (O_WRITE);
    }
  return *q->cs++;
}

/* Return the next character off Q. */
extern inline char
dequeue (struct queue *q)
{
  return dequeue_quote (q) & ~QUEUE_QUOTE_MARK;
}

struct queue *reallocate_queue (struct queue *);

/* Add C to *QP. */
extern inline void
enqueue_internal (struct queue **qp, quoted_char c)
{
  struct queue *q = *qp;

  if (q->ce - q->array == q->arraylen)
    q = *qp = reallocate_queue (q);

  *q->ce++ = c;

  if (qsize (q) == 1)
    {
      condition_broadcast (q->wait);
      if (q == inputq)
	call_asyncs (O_READ);
    }

  if (!q->susp && (qsize (q) > q->hiwat))
    q->susp = 1;
}

/* Add C to *QP. */
extern inline void
enqueue (struct queue **qp, char c)
{
  enqueue_internal (qp, c);
}

/* Add C to *QP, marking it with a quote. */
extern inline void
enqueue_quote (struct queue **qp, char c)
{
  enqueue_internal (qp, c | QUEUE_QUOTE_MARK);
}

/* Return the unquoted version of a quoted_char. */
extern inline char
unquote_char (quoted_char c)
{
  return c & ~QUEUE_QUOTE_MARK;
}

/* Tell if a quoted_char is actually quoted. */
extern inline int
char_quoted_p (quoted_char c)
{
  return c & QUEUE_QUOTE_MARK;
}

/* Remove the most recently enqueue character from Q; leaving
   the quote mark on. */
extern inline short
queue_erase (struct queue *q)
{
  short answer;
  int beep = 0;

  assert (qsize (q));
  answer = *--q->ce;
  if (q->susp && (qsize (q) < q->lowat))
    {
      q->susp = 0;
      beep = 1;
    }
  if (qsize (q) == 0)
    beep = 1;
  if (beep)
    condition_broadcast (q->wait);
  return answer;
}


/* Functions devio is supposed to call */
int input_character (int);
void report_carrier_on (void);
void report_carrier_off (void);
void report_carrier_error (error_t);


/* Other decls */
error_t drop_output (void);
void send_signal (int);
error_t drain_output ();
void output_character (int);
void copy_rawq (void);
void rescan_inputq (void);
void write_character (int);
void init_users (void);

extern char *tty_arg;
extern int rdev;

/* kludge--these are pty versions of trivfs_S_io_* functions called by
   the real functions in users.c to do work for ptys.  */
error_t pty_io_write (struct trivfs_protid *, char *,
		      mach_msg_type_number_t, mach_msg_type_number_t *);
error_t pty_io_read (struct trivfs_protid *, char **,
		     mach_msg_type_number_t *, mach_msg_type_number_t);
error_t pty_io_readable (size_t *);
error_t pty_io_select (struct trivfs_protid *, mach_port_t, int *);
error_t pty_open_hook (struct trivfs_control *, struct iouser *, int);
error_t pty_po_create_hook (struct trivfs_peropen *);
error_t pty_po_destroy_hook (struct trivfs_peropen *);