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Revision 1.6 by root, Sun Jan 22 00:04:20 2006 UTC vs.
Revision 1.39 by sf-exg, Thu Jun 9 14:14:48 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_DEV_PTMX) && 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);
79# else 84# else
80 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 85 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
81# endif 86# endif
87
82 if (pfd >= 0) 88 if (pfd >= 0)
83 { 89 {
84 if (grantpt (pfd) == 0 /* change slave permissions */ 90 if (grantpt (pfd) == 0 /* change slave permissions */
85 && unlockpt (pfd) == 0) 91 && unlockpt (pfd) == 0)
92 {
86 { /* slave now unlocked */ 93 /* slave now unlocked */
87 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 94 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
88 return pfd; 95 return pfd;
89 } 96 }
90 97
91 close (pfd); 98 close (pfd);
92 } 99 }
93 100
94 return -1; 101 return -1;
95} 102 }
103
96#elif defined(HAVE_OPENPTY) 104#elif defined(HAVE_OPENPTY)
105
97static int 106 static int
98get_pty (int *fd_tty, char **ttydev) 107 get_pty (int *fd_tty, char **ttydev)
99{ 108 {
100 int pfd; 109 int pfd;
101 int res; 110 int res;
102 char tty_name[32]; 111
103
104 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 112 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
113
105 if (res != -1) 114 if (res != -1)
106 { 115 {
107 *ttydev = strdup (tty_name); 116 *ttydev = strdup (ttyname (*fd_tty));
108 return pfd; 117 return pfd;
109 } 118 }
110 119
111 return -1; 120 return -1;
112} 121 }
122
113#elif defined(HAVE__GETPTY) 123#elif defined(HAVE__GETPTY)
124
114static int 125 static int
115get_pty (int *fd_tty, char **ttydev) 126 get_pty (int *fd_tty, char **ttydev)
116{ 127 {
117 int pfd; 128 int pfd;
129 char *slave;
118 130
119 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 131 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
120 if (*ttydev != NULL)
121 return pfd;
122 132
123 return -1; 133 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 { 134 {
133 *ttydev = strdup (ttyname (pfd)); 135 *ttydev = strdup (slave);
134 return pfd; 136 return pfd;
135 } 137 }
136 138
137 return -1; 139 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 } 140 }
150 141
151 return -1;
152}
153#else 142#else
143
154/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 144 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
155static int 145 static int
156get_pty (int *fd_tty, char **ttydev) 146 get_pty (int *fd_tty, char **ttydev)
157{ 147 {
158 int pfd; 148 int pfd;
159 int i; 149 int i;
160 char pty_name[32]; 150 char pty_name[32];
161 char tty_name[32]; 151 char tty_name[32];
162 const char *majors = "pqrstuvwxyzabcde"; 152 const char *majors = "pqrstuvwxyzabcde";
163 const char *minors = "0123456789abcdef"; 153 const char *minors = "0123456789abcdef";
154
164 for (i = 0; i < 256; i++) 155 for (i = 0; i < 256; i++)
165 { 156 {
166 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 157 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]); 158 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
159
168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 160 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
169 { 161 {
170 snprintf(pty_name, 32, "/dev/ptyp%d", i); 162 snprintf(pty_name, 32, "/dev/ptyp%d", i);
171 snprintf(tty_name, 32, "/dev/ttyp%d", i); 163 snprintf(tty_name, 32, "/dev/ttyp%d", i);
172 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
173 continue; 165 continue;
174 } 166 }
167
175 if (access (tty_name, R_OK | W_OK) == 0) 168 if (access (tty_name, R_OK | W_OK) == 0)
176 { 169 {
177 *ttydev = strdup (tty_name); 170 *ttydev = strdup (tty_name);
178 return pfd; 171 return pfd;
179 } 172 }
180 173
181 close (pfd); 174 close (pfd);
182 } 175 }
183} 176
177 return -1;
178 }
179
184#endif 180#endif
185 181
186/*----------------------------------------------------------------------*/ 182/*----------------------------------------------------------------------*/
187/* 183/*
188 * Returns tty file descriptor, or -1 on failure 184 * Returns tty file descriptor, or -1 on failure
189 */ 185 */
190static int 186static int
191get_tty (char *ttydev) 187get_tty (char *ttydev)
192{ 188{
193 return open (ttydev, O_RDWR | O_NOCTTY, 0); 189 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
198 * Make our tty a controlling tty so that /dev/tty points to us 194 * Make our tty a controlling tty so that /dev/tty points to us
199 */ 195 */
200static int 196static int
201control_tty (int fd_tty) 197control_tty (int fd_tty)
202{ 198{
199 int fd;
200
203 setsid (); 201 setsid ();
202
203#ifdef TIOCSCTTY
204 ioctl (fd_tty, TIOCSCTTY, NULL);
205#else
206 fd = open (ttyname (fd_tty), O_RDWR);
207 if (fd >= 0)
208 close (fd);
209#endif
210
211 fd = open ("/dev/tty", O_WRONLY);
212 if (fd < 0)
213 return -1; /* fatal */
214
215 close (fd);
216
217 return 0;
218}
219
220void
221ptytty::close_tty ()
222{
223 if (tty < 0)
224 return;
225
226 close (tty);
227 tty = -1;
228}
229
230bool
231ptytty::make_controlling_tty ()
232{
233 return control_tty (tty) >= 0;
234}
235
236void
237ptytty::set_utf8_mode (bool on)
238{
239#ifdef IUTF8
240 if (pty < 0)
241 return;
242
243 struct termios tio;
244
245 if (tcgetattr (pty, &tio) != -1)
246 {
247 tcflag_t new_cflag = tio.c_iflag;
248
249 if (on)
250 new_cflag |= IUTF8;
251 else
252 new_cflag &= ~IUTF8;
253
254 if (new_cflag != tio.c_iflag)
255 {
256 tio.c_iflag = new_cflag;
257 tcsetattr (pty, TCSANOW, &tio);
258 }
259 }
260#endif
261}
262
263static struct ttyconf {
264 gid_t gid;
265 mode_t mode;
266
267 ttyconf ()
268 {
269#ifdef TTY_GID_SUPPORT
270 struct group *gr = getgrnam ("tty");
271
272 if (gr)
273 {
274 /* change group ownership of tty to "tty" */
275 mode = S_IRUSR | S_IWUSR | S_IWGRP;
276 gid = gr->gr_gid;
277 }
278 else
279#endif /* TTY_GID_SUPPORT */
280 {
281 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
282 gid = 0;
283 }
284 }
285} ttyconf;
286
287ptytty_unix::ptytty_unix ()
288{
289 name = 0;
290#if UTMP_SUPPORT
291 cmd_pid = 0;
292#endif
293}
294
295ptytty_unix::~ptytty_unix ()
296{
297#if UTMP_SUPPORT
298 logout ();
299#endif
300 put ();
301}
302
303void
304ptytty_unix::put ()
305{
306 if (name)
307 {
308 chmod (name, RESTORE_TTY_MODE);
309 chown (name, 0, ttyconf.gid);
310 }
311
312 close_tty ();
313
314 if (pty >= 0)
315 close (pty);
316
317 free (name);
318
319 pty = tty = -1;
320 name = 0;
321}
322
323bool
324ptytty_unix::get ()
325{
326 /* get master (pty) */
327 if ((pty = get_pty (&tty, &name)) < 0)
328 return false;
329
330 fcntl (pty, F_SETFL, O_NONBLOCK);
331
332 /* get slave (tty) */
333 if (tty < 0)
334 {
335#ifndef NO_SETOWNER_TTYDEV
336 chown (name, getuid (), ttyconf.gid); /* fail silently */
337 chmod (name, ttyconf.mode);
338# ifdef HAVE_REVOKE
339 revoke (name);
340# endif
341#endif
342
343 if ((tty = get_tty (name)) < 0)
344 {
345 put ();
346 return false;
347 }
348 }
204 349
205#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 350#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
206 /* 351 /*
207 * Push STREAMS modules: 352 * Push STREAMS modules:
208 * ptem: pseudo-terminal hardware emulation module. 353 * ptem: pseudo-terminal hardware emulation module.
209 * ldterm: standard terminal line discipline. 354 * ldterm: standard terminal line discipline.
210 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 355 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
211 * 356 *
212 * After we push the STREAMS modules, the first open () on the slave side 357 * 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 358 * 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 359 * 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 360 * 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 361 * 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 362 * 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 363 * 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 364 * close () - on the master side which causes a hang up to be sent
221 * through - Geoff Wing 365 * through - Geoff Wing
222 */ 366 */
223# ifdef HAVE_ISASTREAM 367#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
224 if (isastream (fd_tty) == 1) 368 if (isastream (tty) == 1)
225# endif 369# endif
226 { 370 {
227 ioctl (fd_tty, I_PUSH, "ptem"); 371 ioctl (tty, I_PUSH, "ptem");
228 ioctl (fd_tty, I_PUSH, "ldterm"); 372 ioctl (tty, I_PUSH, "ldterm");
229 ioctl (fd_tty, I_PUSH, "ttcompat"); 373 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 { 374 }
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 375#endif
361#endif
362
363 if ((tty = get_tty (name)) < 0)
364 {
365 put ();
366 return false;
367 }
368 }
369 376
370 return true; 377 return true;
371} 378}
372 379
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 : ptytty
390{
391 ptytty *id;
392
393 ~ptytty_proxy ()
394 : id(0)
395 {
396 }
397
398 ~ptytty_proxy ();
399
400 bool get ();
401 void login (int cmd_pid, bool login_shell, const char *hostname);
402};
403
404bool
405ptytty_proxy::get ()
406{
407 command cmd;
408
409 cmd.type = command::get;
410
411 write (sock_fd, &cmd, sizeof (cmd));
412
413 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
414 fatal ("protocol error while creating pty using helper process, aborting.\n");
415
416 if (!id)
417 return false;
418
419 if ((pty = ptytty_recv_fd (sock_fd)) < 0
420 || (tty = ptytty_recv_fd (sock_fd)) < 0)
421 fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
422
423 return true;
424}
425
426void
427ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
428{
429 command cmd;
430
431 cmd.type = command::login;
432 cmd.id = id;
433 cmd.cmd_pid = cmd_pid;
434 cmd.login_shell = login_shell;
435 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
436
437 write (sock_fd, &cmd, sizeof (cmd));
438}
439
440ptytty_proxy::~ptytty_proxy ()
441{
442 if (id)
443 {
444 command cmd;
445
446 cmd.type = command::destroy;
447 cmd.id = id;
448
449 write (sock_fd, &cmd, sizeof (cmd));
450 }
451}
452
453static
454void serve ()
455{
456 command cmd;
457 vector<ptytty *> ptys;
458
459 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
460 {
461 if (cmd.type == command::get)
462 {
463 // -> id ptyfd ttyfd
464 cmd.id = new ptytty_unix;
465
466 if (cmd.id->get ())
467 {
468 write (sock_fd, &cmd.id, sizeof (cmd.id));
469 ptys.push_back (cmd.id);
470
471 ptytty_send_fd (sock_fd, cmd.id->pty);
472 ptytty_send_fd (sock_fd, cmd.id->tty);
473 }
474 else
475 {
476 delete cmd.id;
477 cmd.id = 0;
478 write (sock_fd, &cmd.id, sizeof (cmd.id));
479 }
480 }
481 else if (cmd.type == command::login)
482 {
483#if UTMP_SUPPORT
484 if (find (ptys.begin (), ptys.end (), cmd.id))
485 {
486 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
487 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
488 }
489#endif
490 }
491 else if (cmd.type == command::destroy)
492 {
493 ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
494
495 if (pty)
496 {
497 delete *pty;
498 ptys.erase (pty);
499 }
500 }
501 else
502 break;
503 }
504
505 // destroy all ptys
506 for (ptytty **i = ptys.end (); i-- > ptys.begin (); )
507 delete *i;
508}
509
510void ptytty_server ()
511{
512 int sv[2];
513
514 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
515 fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
516
517 pid = fork ();
518
519 if (pid < 0)
520 fatal ("could not create pty/sessiondb helper process, aborting.\n");
521
522 if (pid)
523 {
524 // client, process
525 sock_fd = sv[0];
526 close (sv[1]);
527 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
528 }
529 else
530 {
531 // server, pty-helper
532 sock_fd = sv[1];
533
534 for (int fd = 0; fd < 1023; fd++)
535 if (fd != sock_fd)
536 close (fd);
537
538 serve ();
539 _exit (EXIT_SUCCESS);
540 }
541}
542
543#endif
544
545// a "factory" *g*
546ptytty *
547new_ptytty ()
548{
549#if PTYTTY_HELPER
550 if (pid > 0)
551 // use helper process
552 return new ptytty_proxy;
553 else
554#endif
555 return new ptytty_unix;
556}
557
558/*----------------------- end-of-file (C source) -----------------------*/
559

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