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Revision 1.4 by root, Sat Jan 21 22:08:20 2006 UTC vs.
Revision 1.41 by sf-exg, Fri Nov 11 15:11:18 2011 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
1/*--------------------------------*-C-*---------------------------------* 4/*----------------------------------------------------------------------*
2 * File: ptytty.C 5 * File: ptytty.C
3 *----------------------------------------------------------------------* 6 *----------------------------------------------------------------------*
4 * 7 *
5 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> 10 * Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
8 * 12 *
9 * This program is free software; you can redistribute it and/or modify 13 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by 14 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or 15 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 16 * (at your option) any later version.
… …
19 * You should have received a copy of the GNU General Public License 23 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software 24 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 26 *---------------------------------------------------------------------*/
23 27
24#include "../config.h" /* NECESSARY */ 28#include "config.h"
25 29
26#include "fdpass.h"
27#include "ptytty.h" 30#include "ptytty.h"
28 31
29#include <cstdlib> 32#include <cstdlib>
30#include <cstring> 33#include <cstring>
34#include <csignal>
31 35
32#include <sys/types.h> 36#include <sys/types.h>
33#include <sys/socket.h> 37#include <sys/stat.h>
34#include <unistd.h> 38#include <unistd.h>
35#include <fcntl.h> 39#include <fcntl.h>
36 40
37#ifdef HAVE_SYS_IOCTL_H 41#ifdef HAVE_SYS_IOCTL_H
38# include <sys/ioctl.h> 42# include <sys/ioctl.h>
39#endif 43#endif
40#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 44#if defined(HAVE_SYS_STROPTS_H)
41# include <sys/stropts.h> /* for I_PUSH */ 45# include <sys/stropts.h> /* for I_PUSH */
42#endif 46#endif
43#ifdef HAVE_ISASTREAM 47#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
44# include <stropts.h> 48# include <stropts.h>
45#endif 49#endif
46#if defined(HAVE_PTY_H) 50#if defined(HAVE_PTY_H)
47# include <pty.h> 51# include <pty.h>
48#elif defined(HAVE_LIBUTIL_H) 52#elif defined(HAVE_LIBUTIL_H)
… …
60 64
61/* ------------------------------------------------------------------------- * 65/* ------------------------------------------------------------------------- *
62 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 66 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
63 * ------------------------------------------------------------------------- */ 67 * ------------------------------------------------------------------------- */
64/* 68/*
65 * Returns pty file descriptor, or -1 on failure 69 * Returns pty file descriptor, or -1 on failure
66 * If successful, ttydev is set to the name of the slave device. 70 * If successful, ttydev is set to the name of the slave device.
67 * fd_tty _may_ also be set to an open fd to the slave device 71 * fd_tty _may_ also be set to an open fd to the slave device
68 */ 72 */
69#if defined(UNIX98_PTY) 73#if defined(UNIX98_PTY)
74
70static int 75 static int
71get_pty (int *fd_tty, char **ttydev) 76 get_pty (int *fd_tty, char **ttydev)
72{ 77 {
73 int pfd; 78 int pfd;
74 79
75# if defined(HAVE_GETPT) 80# if defined(HAVE_GETPT)
76 pfd = getpt(); 81 pfd = getpt();
77# elif defined(HAVE_POSIX_OPENPT) 82# elif defined(HAVE_POSIX_OPENPT)
78 pfd = posix_openpt (O_RDWR); 83 pfd = posix_openpt (O_RDWR | O_NOCTTY);
79# else 84# else
85# ifdef _AIX
80 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 86 pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
87# else
88 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
89# endif
81# endif 90# endif
91
82 if (pfd >= 0) 92 if (pfd >= 0)
83 { 93 {
84 if (grantpt (pfd) == 0 /* change slave permissions */ 94 if (grantpt (pfd) == 0 /* change slave permissions */
85 && unlockpt (pfd) == 0) 95 && unlockpt (pfd) == 0)
96 {
86 { /* slave now unlocked */ 97 /* slave now unlocked */
87 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 98 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
88 return pfd; 99 return pfd;
89 } 100 }
90 101
91 close (pfd); 102 close (pfd);
92 } 103 }
93 104
94 return -1; 105 return -1;
95} 106 }
107
96#elif defined(HAVE_OPENPTY) 108#elif defined(HAVE_OPENPTY)
109
97static int 110 static int
98get_pty (int *fd_tty, char **ttydev) 111 get_pty (int *fd_tty, char **ttydev)
99{ 112 {
100 int pfd; 113 int pfd;
101 int res; 114 int res;
102 char tty_name[32]; 115
103
104 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 116 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
117
105 if (res != -1) 118 if (res != -1)
106 { 119 {
107 *ttydev = strdup (tty_name); 120 *ttydev = strdup (ttyname (*fd_tty));
108 return pfd; 121 return pfd;
109 } 122 }
110 123
111 return -1; 124 return -1;
112} 125 }
126
113#elif defined(HAVE__GETPTY) 127#elif defined(HAVE__GETPTY)
128
114static int 129 static int
115get_pty (int *fd_tty, char **ttydev) 130 get_pty (int *fd_tty, char **ttydev)
116{ 131 {
117 int pfd; 132 int pfd;
133 char *slave;
118 134
119 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 135 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
120 if (*ttydev != NULL)
121 return pfd;
122 136
123 return -1; 137 if (slave != NULL)
124}
125#elif defined(HAVE_DEV_PTC)
126static int
127get_pty (int *fd_tty, char **ttydev)
128{
129 int pfd;
130
131 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
132 { 138 {
133 *ttydev = strdup (ttyname (pfd)); 139 *ttydev = strdup (slave);
134 return pfd; 140 return pfd;
135 } 141 }
136 142
137 return -1; 143 return -1;
138}
139#elif defined(HAVE_DEV_CLONE)
140static int
141get_pty (int *fd_tty, char **ttydev)
142{
143 int pfd;
144
145 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
146 {
147 *ttydev = strdup (ptsname (pfd));
148 return pfd;
149 } 144 }
150 145
151 return -1;
152}
153#else 146#else
147
154/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 148 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
155static int 149 static int
156get_pty (int *fd_tty, char **ttydev) 150 get_pty (int *fd_tty, char **ttydev)
157{ 151 {
158 int pfd; 152 int pfd;
159 int i; 153 int i;
160 char pty_name[32]; 154 char pty_name[32];
161 char tty_name[32]; 155 char tty_name[32];
162 const char *majors = "pqrstuvwxyzabcde"; 156 const char *majors = "pqrstuvwxyzabcde";
163 const char *minors = "0123456789abcdef"; 157 const char *minors = "0123456789abcdef";
158
164 for (i = 0; i < 256; i++) 159 for (i = 0; i < 256; i++)
165 { 160 {
166 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 161 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
167 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); 162 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
163
168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
169 { 165 {
170 snprintf(pty_name, 32, "/dev/ptyp%d", i); 166 snprintf(pty_name, 32, "/dev/ptyp%d", i);
171 snprintf(tty_name, 32, "/dev/ttyp%d", i); 167 snprintf(tty_name, 32, "/dev/ttyp%d", i);
172 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
173 continue; 169 continue;
174 } 170 }
171
175 if (access (tty_name, R_OK | W_OK) == 0) 172 if (access (tty_name, R_OK | W_OK) == 0)
176 { 173 {
177 *ttydev = strdup (tty_name); 174 *ttydev = strdup (tty_name);
178 return pfd; 175 return pfd;
179 } 176 }
180 177
181 close (pfd); 178 close (pfd);
182 } 179 }
183} 180
181 return -1;
182 }
183
184#endif 184#endif
185 185
186/*----------------------------------------------------------------------*/ 186/*----------------------------------------------------------------------*/
187/* 187/*
188 * Returns tty file descriptor, or -1 on failure 188 * Returns tty file descriptor, or -1 on failure
189 */ 189 */
190static int 190static int
191get_tty (char *ttydev) 191get_tty (char *ttydev)
192{ 192{
193 return open (ttydev, O_RDWR | O_NOCTTY, 0); 193 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
198 * Make our tty a controlling tty so that /dev/tty points to us 198 * Make our tty a controlling tty so that /dev/tty points to us
199 */ 199 */
200static int 200static int
201control_tty (int fd_tty) 201control_tty (int fd_tty)
202{ 202{
203 int fd;
204
203 setsid (); 205 setsid ();
204 206
205#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 207#ifdef TIOCSCTTY
208 ioctl (fd_tty, TIOCSCTTY, NULL);
209#else
210 fd = open (ttyname (fd_tty), O_RDWR);
211 if (fd >= 0)
212 close (fd);
213#endif
214
215 fd = open ("/dev/tty", O_WRONLY);
216 if (fd < 0)
217 return -1; /* fatal */
218
219 close (fd);
220
221 return 0;
222}
223
224void
225ptytty::close_tty ()
226{
227 if (tty < 0)
228 return;
229
230 close (tty);
231 tty = -1;
232}
233
234bool
235ptytty::make_controlling_tty ()
236{
237 return control_tty (tty) >= 0;
238}
239
240void
241ptytty::set_utf8_mode (bool on)
242{
243#ifdef IUTF8
244 if (pty < 0)
245 return;
246
247 struct termios tio;
248
249 if (tcgetattr (pty, &tio) != -1)
250 {
251 tcflag_t new_cflag = tio.c_iflag;
252
253 if (on)
254 new_cflag |= IUTF8;
255 else
256 new_cflag &= ~IUTF8;
257
258 if (new_cflag != tio.c_iflag)
259 {
260 tio.c_iflag = new_cflag;
261 tcsetattr (pty, TCSANOW, &tio);
262 }
263 }
264#endif
265}
266
267static struct ttyconf {
268 gid_t gid;
269 mode_t mode;
270
271 ttyconf ()
272 {
273#ifdef TTY_GID_SUPPORT
274 struct group *gr = getgrnam ("tty");
275
276 if (gr)
277 {
278 /* change group ownership of tty to "tty" */
279 mode = S_IRUSR | S_IWUSR | S_IWGRP;
280 gid = gr->gr_gid;
281 }
282 else
283#endif /* TTY_GID_SUPPORT */
284 {
285 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
286 gid = 0;
287 }
288 }
289} ttyconf;
290
291ptytty_unix::ptytty_unix ()
292{
293 name = 0;
294#if UTMP_SUPPORT
295 cmd_pid = 0;
296#endif
297}
298
299ptytty_unix::~ptytty_unix ()
300{
301#if UTMP_SUPPORT
302 logout ();
303#endif
304 put ();
305}
306
307void
308ptytty_unix::put ()
309{
310 if (name)
311 {
312 chmod (name, RESTORE_TTY_MODE);
313 chown (name, 0, ttyconf.gid);
314 }
315
316 close_tty ();
317
318 if (pty >= 0)
319 close (pty);
320
321 free (name);
322
323 pty = tty = -1;
324 name = 0;
325}
326
327bool
328ptytty_unix::get ()
329{
330 /* get master (pty) */
331 if ((pty = get_pty (&tty, &name)) < 0)
332 return false;
333
334 fcntl (pty, F_SETFL, O_NONBLOCK);
335
336 /* get slave (tty) */
337 if (tty < 0)
338 {
339#ifndef NO_SETOWNER_TTYDEV
340 chown (name, getuid (), ttyconf.gid); /* fail silently */
341 chmod (name, ttyconf.mode);
342# ifdef HAVE_REVOKE
343 revoke (name);
344# endif
345#endif
346
347 if ((tty = get_tty (name)) < 0)
348 {
349 put ();
350 return false;
351 }
352 }
353
354#if defined(I_PUSH)
206 /* 355 /*
207 * Push STREAMS modules: 356 * Push STREAMS modules:
208 * ptem: pseudo-terminal hardware emulation module. 357 * ptem: pseudo-terminal hardware emulation module.
209 * ldterm: standard terminal line discipline. 358 * ldterm: standard terminal line discipline.
210 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 359 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
211 * 360 *
212 * After we push the STREAMS modules, the first open () on the slave side 361 * After we push the STREAMS modules, the first open () on the slave side
213 * (i.e. the next section between the dashes giving us "tty opened OK")
214 * should make the "ptem" (or "ldterm" depending upon either which OS 362 * should make the "ptem" (or "ldterm" depending upon either which OS
215 * version or which set of manual pages you have) module give us a 363 * version or which set of manual pages you have) module give us a
216 * controlling terminal. We must already have close ()d the master side 364 * controlling terminal. We must already have close ()d the master side
217 * fd in this child process before we push STREAMS modules on because the 365 * fd in this child process before we push STREAMS modules on because the
218 * documentation is really unclear about whether it is any close () on 366 * documentation is really unclear about whether it is any close () on
219 * the master side or the last close () - i.e. a proper STREAMS dismantling 367 * the master side or the last close () - i.e. a proper STREAMS dismantling
220 * close () - on the master side which causes a hang up to be sent 368 * close () - on the master side which causes a hang up to be sent
221 * through - Geoff Wing 369 * through - Geoff Wing
222 */ 370 */
223# ifdef HAVE_ISASTREAM 371#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
224 if (isastream (fd_tty) == 1) 372 if (isastream (tty) == 1)
225# endif 373# endif
226 { 374 {
227 ioctl (fd_tty, I_PUSH, "ptem"); 375 ioctl (tty, I_PUSH, "ptem");
228 ioctl (fd_tty, I_PUSH, "ldterm"); 376 ioctl (tty, I_PUSH, "ldterm");
229 ioctl (fd_tty, I_PUSH, "ttcompat"); 377 ioctl (tty, I_PUSH, "ttcompat");
230 }
231#endif
232
233 ioctl (fd_tty, TIOCSCTTY, NULL);
234
235 int fd = open ("/dev/tty", O_WRONLY);
236 if (fd < 0)
237 return -1; /* fatal */
238
239 close (fd);
240
241 return 0;
242}
243
244void
245ptytty::close_tty ()
246{
247 if (tty < 0)
248 return;
249
250 close (tty);
251 tty = -1;
252}
253
254bool
255ptytty::make_controlling_tty ()
256{
257 return control_tty (tty) >= 0;
258}
259
260void
261ptytty::set_utf8_mode (bool on)
262{
263#ifdef IUTF8
264 if (pty < 0)
265 return;
266
267 struct termios tio;
268
269 if (tcgetattr (pty, &tio) != -1)
270 { 378 }
271 tcflag_t new_cflag = tio.c_iflag;
272
273 if (on)
274 new_cflag |= IUTF8;
275 else
276 new_cflag &= ~IUTF8;
277
278 if (new_cflag != tio.c_iflag)
279 {
280 tio.c_iflag = new_cflag;
281 tcsetattr (pty, TCSANOW, &tio);
282 }
283 }
284#endif
285}
286
287static struct ttyconf {
288 gid_t gid;
289 mode_t mode;
290
291 ttyconf ()
292 {
293#ifdef TTY_GID_SUPPORT
294 struct group *gr = getgrnam ("tty");
295
296 if (gr)
297 { /* change group ownership of tty to "tty" */
298 mode = S_IRUSR | S_IWUSR | S_IWGRP;
299 gid = gr->gr_gid;
300 }
301 else
302#endif /* TTY_GID_SUPPORT */
303 {
304 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
305 gid = 0;
306 }
307 }
308} ttyconf;
309
310ptytty_unix::ptytty_unix ()
311{
312 name = 0;
313#if UTMP_SUPPORT
314 cmd_pid = 0;
315#endif
316}
317
318ptytty_unix::~ptytty_unix ()
319{
320#if UTMP_SUPPORT
321 logout ();
322#endif
323 put ();
324}
325
326void
327ptytty_unix::put ()
328{
329 chmod (name, RESTORE_TTY_MODE);
330 chown (name, 0, ttyconf.gid);
331
332 close_tty ();
333
334 if (pty >= 0)
335 close (pty);
336
337 free (name);
338
339 pty = tty = -1;
340 name = 0;
341}
342
343bool
344ptytty_unix::get ()
345{
346 /* get master (pty) */
347 if ((pty = get_pty (&tty, &name)) < 0)
348 return false;
349
350 fcntl (pty, F_SETFL, O_NONBLOCK);
351
352 /* get slave (tty) */
353 if (tty < 0)
354 {
355#ifndef NO_SETOWNER_TTYDEV
356 chown (name, getuid (), ttyconf.gid); /* fail silently */
357 chmod (name, ttyconf.mode);
358# ifdef HAVE_REVOKE
359 revoke (name);
360# endif 379#endif
361#endif
362
363 if ((tty = get_tty (name)) < 0)
364 {
365 put ();
366 return false;
367 }
368 }
369 380
370 return true; 381 return true;
371} 382}
372 383
373#if PTYTTY_HELPER
374
375static int sock_fd;
376static int pid;
377
378struct command
379{
380 enum { get, login, destroy } type;
381
382 ptytty *id;
383
384 bool login_shell;
385 int cmd_pid;
386 char hostname[512]; // arbitrary, but should be plenty
387};
388
389struct ptytty_proxy : zero_initialized, ptytty
390{
391 ptytty *id;
392
393 ~ptytty_proxy ();
394
395 bool get ();
396 void login (int cmd_pid, bool login_shell, const char *hostname);
397};
398
399bool
400ptytty_proxy::get ()
401{
402 command cmd;
403
404 cmd.type = command::get;
405
406 write (sock_fd, &cmd, sizeof (cmd));
407
408 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
409 fatal ("protocol error while creating pty using helper process, aborting.\n");
410
411 if (!id)
412 return false;
413
414 if ((pty = ptytty_recv_fd (sock_fd)) < 0
415 || (tty = ptytty_recv_fd (sock_fd)) < 0)
416 fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
417
418 return true;
419}
420
421void
422ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
423{
424 command cmd;
425
426 cmd.type = command::login;
427 cmd.id = id;
428 cmd.cmd_pid = cmd_pid;
429 cmd.login_shell = login_shell;
430 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
431
432 write (sock_fd, &cmd, sizeof (cmd));
433}
434
435ptytty_proxy::~ptytty_proxy ()
436{
437 command cmd;
438
439 cmd.type = command::destroy;
440 cmd.id = id;
441
442 write (sock_fd, &cmd, sizeof (cmd));
443}
444
445static
446void serve ()
447{
448 command cmd;
449 vector<ptytty *> ptys;
450
451 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
452 {
453 if (cmd.type == command::get)
454 {
455 // -> id ptyfd ttyfd
456 cmd.id = new ptytty_unix;
457
458 if (cmd.id->get ())
459 {
460 write (sock_fd, &cmd.id, sizeof (cmd.id));
461 ptys.push_back (cmd.id);
462
463 ptytty_send_fd (sock_fd, cmd.id->pty);
464 ptytty_send_fd (sock_fd, cmd.id->tty);
465 }
466 else
467 {
468 delete cmd.id;
469 cmd.id = 0;
470 write (sock_fd, &cmd.id, sizeof (cmd.id));
471 }
472 }
473 else if (cmd.type == command::login)
474 {
475#if UTMP_SUPPORT
476 if (find (ptys.begin (), ptys.end (), cmd.id))
477 {
478 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
479 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
480 }
481#endif
482 }
483 else if (cmd.type == command::destroy)
484 {
485 ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
486
487 if (pty)
488 {
489 delete *pty;
490 ptys.erase (pty);
491 }
492 }
493 else
494 break;
495 }
496
497 // destroy all ptys
498 for (ptytty **i = ptys.end (); i-- > ptys.begin (); )
499 delete *i;
500}
501
502void ptytty_server ()
503{
504 int sv[2];
505
506 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
507 fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
508
509 pid = fork ();
510
511 if (pid < 0)
512 fatal ("could not create pty/sessiondb helper process, aborting.\n");
513
514 if (pid)
515 {
516 // client, urxvt
517 sock_fd = sv[0];
518 close (sv[1]);
519 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
520 }
521 else
522 {
523 // server, pty-helper
524 sock_fd = sv[1];
525
526 for (int fd = 0; fd < 1023; fd++)
527 if (fd != sock_fd)
528 close (fd);
529
530 serve ();
531 _exit (EXIT_SUCCESS);
532 }
533}
534
535#endif
536
537// a "factory" *g*
538ptytty *
539new_ptytty ()
540{
541#if PTYTTY_HELPER
542 if (pid > 0)
543 // use helper process
544 return new ptytty_proxy;
545 else
546#endif
547 return new ptytty_unix;
548}
549
550/*----------------------- end-of-file (C source) -----------------------*/
551

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