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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.6 by root, Sun Jan 22 00:04:20 2006 UTC vs.
Revision 1.49 by sf-exg, Wed Jan 18 20:05:13 2012 UTC

1/*--------------------------------*-C-*---------------------------------* 1/*----------------------------------------------------------------------*
2 * File: ptytty.C 2 * File: ptytty.C
3 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
4 * 4 *
5 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> 7 * Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
8 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
8 * 9 *
9 * This program is free software; you can redistribute it and/or modify 10 * 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 11 * 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 12 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 13 * (at your option) any later version.
… …
19 * You should have received a copy of the GNU General Public License 20 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software 21 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 23 *---------------------------------------------------------------------*/
23 24
24#include "../config.h" /* NECESSARY */ 25#include "config.h"
25 26
26#include "fdpass.h"
27#include "ptytty.h" 27#include "ptytty.h"
28 28
29#include <cstdlib> 29#include <stdlib.h>
30#include <cstdio>
30#include <cstring> 31#include <cstring>
31 32
32#include <sys/types.h> 33#include <sys/types.h>
33#include <sys/socket.h> 34#include <sys/stat.h>
34#include <unistd.h> 35#include <unistd.h>
35#include <fcntl.h> 36#include <fcntl.h>
36 37
37#ifdef HAVE_SYS_IOCTL_H 38#ifdef HAVE_SYS_IOCTL_H
38# include <sys/ioctl.h> 39# include <sys/ioctl.h>
39#endif 40#endif
40#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 41#if defined(HAVE_SYS_STROPTS_H)
41# include <sys/stropts.h> /* for I_PUSH */ 42# include <sys/stropts.h> /* for I_PUSH */
42#endif 43#endif
43#ifdef HAVE_ISASTREAM 44#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
44# include <stropts.h> 45# include <stropts.h>
45#endif 46#endif
46#if defined(HAVE_PTY_H) 47#if defined(HAVE_PTY_H)
47# include <pty.h> 48# include <pty.h>
48#elif defined(HAVE_LIBUTIL_H) 49#elif defined(HAVE_LIBUTIL_H)
… …
52#endif 53#endif
53#ifdef TTY_GID_SUPPORT 54#ifdef TTY_GID_SUPPORT
54#include <grp.h> 55#include <grp.h>
55#endif 56#endif
56 57
57#include <cstdio> 58#ifndef O_NOCTTY
59# define O_NOCTTY 0
60#endif
58 61
59///////////////////////////////////////////////////////////////////////////// 62/////////////////////////////////////////////////////////////////////////////
60 63
61/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
62 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
63 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
64/* 67/*
65 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
66 * If successful, ttydev is set to the name of the slave device. 69 * 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 70 * fd_tty _may_ also be set to an open fd to the slave device
68 */ 71 */
69#if defined(UNIX98_PTY) 72#if defined(UNIX98_PTY)
73
70static int 74 static int
71get_pty (int *fd_tty, char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
72{ 76 {
73 int pfd; 77 int pfd;
74 78
75# if defined(HAVE_GETPT) 79# if defined(HAVE_GETPT)
76 pfd = getpt(); 80 pfd = getpt ();
77# elif defined(HAVE_POSIX_OPENPT) 81# elif defined(HAVE_POSIX_OPENPT)
78 pfd = posix_openpt (O_RDWR); 82 pfd = posix_openpt (O_RDWR | O_NOCTTY);
79# else 83# else
84# ifdef _AIX
80 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 85 pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
86# else
87 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
88# endif
81# endif 89# endif
90
82 if (pfd >= 0) 91 if (pfd >= 0)
83 { 92 {
84 if (grantpt (pfd) == 0 /* change slave permissions */ 93 if (grantpt (pfd) == 0 /* change slave permissions */
85 && unlockpt (pfd) == 0) 94 && unlockpt (pfd) == 0)
95 {
86 { /* slave now unlocked */ 96 /* slave now unlocked */
87 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 97 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
88 return pfd; 98 return pfd;
89 } 99 }
90 100
91 close (pfd); 101 close (pfd);
92 } 102 }
93 103
94 return -1; 104 return -1;
95} 105 }
106
96#elif defined(HAVE_OPENPTY) 107#elif defined(HAVE_OPENPTY)
108
97static int 109 static int
98get_pty (int *fd_tty, char **ttydev) 110 get_pty (int *fd_tty, char **ttydev)
99{ 111 {
100 int pfd; 112 int pfd;
101 int res; 113 int res;
102 char tty_name[32]; 114
103
104 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 115 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
116
105 if (res != -1) 117 if (res != -1)
106 { 118 {
107 *ttydev = strdup (tty_name); 119 *ttydev = strdup (ttyname (*fd_tty));
108 return pfd; 120 return pfd;
109 } 121 }
110 122
111 return -1; 123 return -1;
112} 124 }
125
113#elif defined(HAVE__GETPTY) 126#elif defined(HAVE__GETPTY)
127
114static int 128 static int
115get_pty (int *fd_tty, char **ttydev) 129 get_pty (int *fd_tty, char **ttydev)
116{ 130 {
117 int pfd; 131 int pfd;
132 char *slave;
118 133
119 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 134 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
120 if (*ttydev != NULL)
121 return pfd;
122 135
123 return -1; 136 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 { 137 {
133 *ttydev = strdup (ttyname (pfd)); 138 *ttydev = strdup (slave);
134 return pfd; 139 return pfd;
135 } 140 }
136 141
137 return -1; 142 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 } 143 }
150 144
151 return -1;
152}
153#else 145#else
146
154/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 147 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
155static int 148 static int
156get_pty (int *fd_tty, char **ttydev) 149 get_pty (int *fd_tty, char **ttydev)
157{ 150 {
158 int pfd; 151 int pfd;
159 int i; 152 int i;
160 char pty_name[32]; 153 char pty_name[32];
161 char tty_name[32]; 154 char tty_name[32];
162 const char *majors = "pqrstuvwxyzabcde"; 155 const char *majors = "pqrstuvwxyzabcde";
163 const char *minors = "0123456789abcdef"; 156 const char *minors = "0123456789abcdef";
157
164 for (i = 0; i < 256; i++) 158 for (i = 0; i < 256; i++)
165 { 159 {
166 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 160 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]); 161 snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
162
168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 163 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
169 { 164 {
170 snprintf(pty_name, 32, "/dev/ptyp%d", i); 165 snprintf (pty_name, 32, "/dev/ptyp%d", i);
171 snprintf(tty_name, 32, "/dev/ttyp%d", i); 166 snprintf (tty_name, 32, "/dev/ttyp%d", i);
172 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 167 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
173 continue; 168 continue;
174 } 169 }
170
175 if (access (tty_name, R_OK | W_OK) == 0) 171 if (access (tty_name, R_OK | W_OK) == 0)
176 { 172 {
177 *ttydev = strdup (tty_name); 173 *ttydev = strdup (tty_name);
178 return pfd; 174 return pfd;
179 } 175 }
180 176
181 close (pfd); 177 close (pfd);
182 } 178 }
183} 179
180 return -1;
181 }
182
184#endif 183#endif
185 184
186/*----------------------------------------------------------------------*/ 185/*----------------------------------------------------------------------*/
187/* 186/*
188 * Returns tty file descriptor, or -1 on failure 187 * Returns tty file descriptor, or -1 on failure
189 */ 188 */
190static int 189static int
191get_tty (char *ttydev) 190get_tty (char *ttydev)
192{ 191{
193 return open (ttydev, O_RDWR | O_NOCTTY, 0); 192 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
198 * Make our tty a controlling tty so that /dev/tty points to us 197 * Make our tty a controlling tty so that /dev/tty points to us
199 */ 198 */
200static int 199static int
201control_tty (int fd_tty) 200control_tty (int fd_tty)
202{ 201{
202 int fd;
203
203 setsid (); 204 setsid ();
204 205
205#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 206#ifdef TIOCSCTTY
207 ioctl (fd_tty, TIOCSCTTY, NULL);
208#else
209 fd = open (ttyname (fd_tty), O_RDWR);
210 if (fd >= 0)
211 close (fd);
212#endif
213
214 fd = open ("/dev/tty", O_WRONLY);
215 if (fd < 0)
216 return -1; /* fatal */
217
218 close (fd);
219
220 return 0;
221}
222
223void
224ptytty::close_tty ()
225{
226 if (tty < 0)
227 return;
228
229 close (tty);
230 tty = -1;
231}
232
233bool
234ptytty::make_controlling_tty ()
235{
236 return control_tty (tty) >= 0;
237}
238
239void
240ptytty::set_utf8_mode (bool on)
241{
242#ifdef IUTF8
243 if (pty < 0)
244 return;
245
246 struct termios tio;
247
248 if (tcgetattr (pty, &tio) != -1)
249 {
250 tcflag_t new_cflag = tio.c_iflag;
251
252 if (on)
253 new_cflag |= IUTF8;
254 else
255 new_cflag &= ~IUTF8;
256
257 if (new_cflag != tio.c_iflag)
258 {
259 tio.c_iflag = new_cflag;
260 tcsetattr (pty, TCSANOW, &tio);
261 }
262 }
263#endif
264}
265
266static struct ttyconf {
267 gid_t gid;
268 mode_t mode;
269
270 ttyconf ()
271 {
272#ifdef TTY_GID_SUPPORT
273 struct group *gr = getgrnam ("tty");
274
275 if (gr)
276 {
277 /* change group ownership of tty to "tty" */
278 mode = S_IRUSR | S_IWUSR | S_IWGRP;
279 gid = gr->gr_gid;
280 }
281 else
282#endif /* TTY_GID_SUPPORT */
283 {
284 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
285 gid = 0;
286 }
287 }
288} ttyconf;
289
290ptytty_unix::ptytty_unix ()
291{
292 name = 0;
293#if UTMP_SUPPORT
294 cmd_pid = 0;
295#endif
296}
297
298ptytty_unix::~ptytty_unix ()
299{
300#if UTMP_SUPPORT
301 logout ();
302#endif
303 put ();
304}
305
306void
307ptytty_unix::put ()
308{
309 if (name)
310 {
311 chmod (name, RESTORE_TTY_MODE);
312 chown (name, 0, ttyconf.gid);
313 }
314
315 close_tty ();
316
317 if (pty >= 0)
318 close (pty);
319
320 free (name);
321
322 pty = tty = -1;
323 name = 0;
324}
325
326bool
327ptytty_unix::get ()
328{
329 /* get master (pty) */
330 if ((pty = get_pty (&tty, &name)) < 0)
331 return false;
332
333 /* get slave (tty) */
334 if (tty < 0)
335 {
336#ifndef NO_SETOWNER_TTYDEV
337 chown (name, getuid (), ttyconf.gid); /* fail silently */
338 chmod (name, ttyconf.mode);
339# ifdef HAVE_REVOKE
340 revoke (name);
341# endif
342#endif
343
344 if ((tty = get_tty (name)) < 0)
345 {
346 put ();
347 return false;
348 }
349 }
350
351#if defined(I_PUSH)
206 /* 352 /*
207 * Push STREAMS modules: 353 * Push STREAMS modules:
208 * ptem: pseudo-terminal hardware emulation module. 354 * ptem: pseudo-terminal hardware emulation module.
209 * ldterm: standard terminal line discipline. 355 * ldterm: standard terminal line discipline.
210 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 356 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
211 * 357 *
212 * After we push the STREAMS modules, the first open () on the slave side 358 * 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 359 * 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 360 * 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 361 * 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 362 * 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 363 * 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 364 * 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 365 * close () - on the master side which causes a hang up to be sent
221 * through - Geoff Wing 366 * through - Geoff Wing
222 */ 367 */
223# ifdef HAVE_ISASTREAM 368#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
224 if (isastream (fd_tty) == 1) 369 if (isastream (tty) == 1)
225# endif 370# endif
226 { 371 {
227 ioctl (fd_tty, I_PUSH, "ptem"); 372 ioctl (tty, I_PUSH, "ptem");
228 ioctl (fd_tty, I_PUSH, "ldterm"); 373 ioctl (tty, I_PUSH, "ldterm");
229 ioctl (fd_tty, I_PUSH, "ttcompat"); 374 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 { 375 }
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 376#endif
285}
286 377
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 378#if UTMP_SUPPORT
314 cmd_pid = 0; 379# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
315#endif 380 int fd_stdin = dup (STDIN_FILENO);
316} 381 dup2 (tty, STDIN_FILENO);
317 382
318ptytty_unix::~ptytty_unix () 383 utmp_pos = ttyslot ();
319{
320#if UTMP_SUPPORT
321 logout ();
322#endif
323 put ();
324}
325 384
326void 385 dup2 (fd_stdin, STDIN_FILENO);
327ptytty_unix::put () 386 close (fd_stdin);
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 387# endif
361#endif 388#endif
362 389
363 if ((tty = get_tty (name)) < 0)
364 {
365 put ();
366 return false;
367 }
368 }
369
370 return true; 390 return true;
371} 391}
372 392
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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