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
|
/* tty.cc
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "miscfuncs.h"
#include <unistd.h>
#include <utmp.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "pinfo.h"
#include "shared_info.h"
HANDLE NO_COPY tty_list::mutex = NULL;
extern "C" int
getpt (void)
{
return open ("/dev/ptmx", O_RDWR | O_NOCTTY);
}
extern "C" int
posix_openpt (int oflags)
{
return open ("/dev/ptmx", oflags);
}
extern "C" int
grantpt (int fd)
{
cygheap_fdget cfd (fd);
return cfd < 0 ? -1 : 0;
}
extern "C" int
unlockpt (int fd)
{
cygheap_fdget cfd (fd);
return cfd < 0 ? -1 : 0;
}
extern "C" int
revoke (char *ttyname)
{
set_errno (ENOSYS);
return -1;
}
extern "C" int
ttyslot (void)
{
if (myself->ctty <= 0 || iscons_dev (myself->ctty))
return -1;
return device::minor (myself->ctty);
}
void __stdcall
tty_list::init_session ()
{
char mutex_name[MAX_PATH];
char *name = shared_name (mutex_name, "tty_list::mutex", 0);
/* tty_list::mutex is used while searching for a tty slot */
if (!(mutex = CreateMutex (&sec_all_nih, FALSE, name)))
api_fatal ("can't create tty_list::mutex '%s', %E", name);
ProtectHandle (mutex);
}
void __stdcall
tty::init_session ()
{
if (!myself->cygstarted && NOTSTATE (myself, PID_CYGPARENT))
cygheap->fdtab.get_debugger_info ();
}
int __reg2
tty_list::attach (int n)
{
int res;
if (iscons_dev (n))
res = -1;
else if (n != -1)
res = connect (device::minor (n));
else
res = -1;
return res;
}
int
tty_list::connect (int ttynum)
{
if (ttynum < 0 || ttynum >= NTTYS)
{
termios_printf ("ttynum (%d) out of range", ttynum);
return -1;
}
if (!ttys[ttynum].exists ())
{
termios_printf ("pty %d was not allocated", ttynum);
set_errno (ENXIO);
return -1;
}
return ttynum;
}
void
tty_list::init ()
{
for (int i = 0; i < NTTYS; i++)
{
ttys[i].init ();
ttys[i].setntty (DEV_PTYS_MAJOR, i);
}
}
/* Search for a free tty and allocate it.
Return tty number or -1 if error.
*/
int
tty_list::allocate (HANDLE& r, HANDLE& w)
{
lock_ttys here;
int freetty = -1;
tty *t = NULL;
for (int i = 0; i < NTTYS; i++)
if (ttys[i].not_allocated (r, w))
{
t = ttys + i;
t->init ();
t->setsid (0);
freetty = i;
break;
}
if (freetty >= 0)
termios_printf ("pty%d allocated", freetty);
else
{
system_printf ("No pty allocated");
r = w = NULL;
}
return freetty;
}
bool
tty::not_allocated (HANDLE& r, HANDLE& w)
{
/* Attempt to open the from-master side of the tty. If it is accessible
then it exists although we may not have privileges to actually use it. */
char pipename[sizeof("ptyNNNN-from-master")];
__small_sprintf (pipename, "pty%d-from-master", get_minor ());
/* fhandler_pipe::create returns 0 when creation succeeds */
return fhandler_pipe::create (&sec_none, &r, &w,
fhandler_pty_common::pipesize, pipename,
0) == 0;
}
bool
tty::exists ()
{
HANDLE r, w;
bool res;
if (!not_allocated (r, w))
res = true;
else
{
/* Handles are left open when not_allocated finds a non-open "tty" */
CloseHandle (r);
CloseHandle (w);
res = false;
}
debug_printf ("exists %d", res);
return res;
}
bool
tty::slave_alive ()
{
HANDLE ev;
if ((ev = open_inuse (READ_CONTROL)))
CloseHandle (ev);
return ev != NULL;
}
HANDLE
tty::open_mutex (const char *mutex, ACCESS_MASK access)
{
char buf[MAX_PATH];
shared_name (buf, mutex, get_minor ());
return OpenMutex (access, TRUE, buf);
}
HANDLE
tty::open_inuse (ACCESS_MASK access)
{
char buf[MAX_PATH];
shared_name (buf, TTY_SLAVE_ALIVE, get_minor ());
return OpenEvent (access, FALSE, buf);
}
HANDLE
tty::create_inuse (PSECURITY_ATTRIBUTES sa)
{
HANDLE h;
char buf[MAX_PATH];
shared_name (buf, TTY_SLAVE_ALIVE, get_minor ());
h = CreateEvent (sa, TRUE, FALSE, buf);
termios_printf ("%s %p", buf, h);
if (!h)
termios_printf ("couldn't open inuse event %s, %E", buf);
return h;
}
void
tty::init ()
{
output_stopped = 0;
setsid (0);
pgid = 0;
was_opened = false;
master_pid = 0;
is_console = false;
attach_pcon_in_fork = false;
hPseudoConsole = NULL;
column = 0;
switch_to_pcon_in = false;
switch_to_pcon_out = false;
screen_alternated = false;
mask_switch_to_pcon_in = false;
pcon_pid = 0;
num_pcon_attached_slaves = 0;
TermCodePage = 20127; /* ASCII */
need_clear_screen = false;
}
HANDLE
tty::get_event (const char *fmt, PSECURITY_ATTRIBUTES sa, BOOL manual_reset)
{
HANDLE hev;
char buf[MAX_PATH];
shared_name (buf, fmt, get_minor ());
if (!sa)
sa = &sec_all;
if (!(hev = CreateEvent (sa, manual_reset, FALSE, buf)))
{
termios_printf ("couldn't create %s", buf);
set_errno (ENOENT); /* FIXME this can't be the right errno */
return NULL;
}
termios_printf ("created event %s", buf);
return hev;
}
lock_ttys::lock_ttys (DWORD howlong): release_me (true)
{
if (WaitForSingleObject (tty_list::mutex, howlong) == WAIT_FAILED)
{
termios_printf ("WFSO for mutex %p failed, %E", tty_list::mutex);
release_me = false;
}
}
void
lock_ttys::release ()
{
ReleaseMutex (tty_list::mutex);
}
const char *
tty_min::ttyname ()
{
device d;
d.parse (ntty);
return d.name ();
}
|