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Revision 1.9 by root, Sun Jan 22 03:49:41 2006 UTC vs.
Revision 1.49 by sf-exg, Wed Jan 18 20:05:13 2012 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
4/*----------------------------------------------------------------------* 1/*----------------------------------------------------------------------*
5 * File: ptytty.C 2 * File: ptytty.C
6 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
7 * 4 *
8 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
10 * 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>
11 * 9 *
12 * 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
13 * 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
14 * the Free Software Foundation; either version 2 of the License, or 12 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version. 13 * (at your option) any later version.
… …
22 * 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
23 * along with this program; if not, write to the Free Software 21 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *---------------------------------------------------------------------*/ 23 *---------------------------------------------------------------------*/
26 24
27#include "../config.h" 25#include "config.h"
28 26
29#include "ptytty.h" 27#include "ptytty.h"
30 28
31#include <cstdlib> 29#include <stdlib.h>
30#include <cstdio>
32#include <cstring> 31#include <cstring>
33 32
34#include <sys/types.h> 33#include <sys/types.h>
35#include <sys/socket.h> 34#include <sys/stat.h>
36#include <unistd.h> 35#include <unistd.h>
37#include <fcntl.h> 36#include <fcntl.h>
38 37
39#ifdef HAVE_SYS_IOCTL_H 38#ifdef HAVE_SYS_IOCTL_H
40# include <sys/ioctl.h> 39# include <sys/ioctl.h>
41#endif 40#endif
42#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 41#if defined(HAVE_SYS_STROPTS_H)
43# include <sys/stropts.h> /* for I_PUSH */ 42# include <sys/stropts.h> /* for I_PUSH */
44#endif 43#endif
45#ifdef HAVE_ISASTREAM 44#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
46# include <stropts.h> 45# include <stropts.h>
47#endif 46#endif
48#if defined(HAVE_PTY_H) 47#if defined(HAVE_PTY_H)
49# include <pty.h> 48# include <pty.h>
50#elif defined(HAVE_LIBUTIL_H) 49#elif defined(HAVE_LIBUTIL_H)
… …
54#endif 53#endif
55#ifdef TTY_GID_SUPPORT 54#ifdef TTY_GID_SUPPORT
56#include <grp.h> 55#include <grp.h>
57#endif 56#endif
58 57
59#include <cstdio> 58#ifndef O_NOCTTY
59# define O_NOCTTY 0
60#endif
60 61
61///////////////////////////////////////////////////////////////////////////// 62/////////////////////////////////////////////////////////////////////////////
62 63
63/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
64 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
65 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
66/* 67/*
67 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
68 * 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.
69 * 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
70 */ 71 */
71#if defined(UNIX98_PTY) 72#if defined(UNIX98_PTY)
73
72static int 74 static int
73get_pty (int *fd_tty, char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
74{ 76 {
75 int pfd; 77 int pfd;
76 78
77# if defined(HAVE_GETPT) 79# if defined(HAVE_GETPT)
78 pfd = getpt(); 80 pfd = getpt ();
79# elif defined(HAVE_POSIX_OPENPT) 81# elif defined(HAVE_POSIX_OPENPT)
80 pfd = posix_openpt (O_RDWR); 82 pfd = posix_openpt (O_RDWR | O_NOCTTY);
81# else 83# else
84# ifdef _AIX
82 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
83# endif 89# endif
90
84 if (pfd >= 0) 91 if (pfd >= 0)
85 { 92 {
86 if (grantpt (pfd) == 0 /* change slave permissions */ 93 if (grantpt (pfd) == 0 /* change slave permissions */
87 && unlockpt (pfd) == 0) 94 && unlockpt (pfd) == 0)
95 {
88 { /* slave now unlocked */ 96 /* slave now unlocked */
89 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 97 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
90 return pfd; 98 return pfd;
91 } 99 }
92 100
93 close (pfd); 101 close (pfd);
94 } 102 }
95 103
96 return -1; 104 return -1;
97} 105 }
106
98#elif defined(HAVE_OPENPTY) 107#elif defined(HAVE_OPENPTY)
108
99static int 109 static int
100get_pty (int *fd_tty, char **ttydev) 110 get_pty (int *fd_tty, char **ttydev)
101{ 111 {
102 int pfd; 112 int pfd;
103 int res; 113 int res;
104 char tty_name[32]; 114
105
106 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 115 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
116
107 if (res != -1) 117 if (res != -1)
108 { 118 {
109 *ttydev = strdup (tty_name); 119 *ttydev = strdup (ttyname (*fd_tty));
110 return pfd; 120 return pfd;
111 } 121 }
112 122
113 return -1; 123 return -1;
114} 124 }
125
115#elif defined(HAVE__GETPTY) 126#elif defined(HAVE__GETPTY)
127
116static int 128 static int
117get_pty (int *fd_tty, char **ttydev) 129 get_pty (int *fd_tty, char **ttydev)
118{ 130 {
119 int pfd; 131 int pfd;
132 char *slave;
120 133
121 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 134 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
122 if (*ttydev != NULL)
123 return pfd;
124 135
125 return -1; 136 if (slave != NULL)
126}
127#elif defined(HAVE_DEV_PTC)
128static int
129get_pty (int *fd_tty, char **ttydev)
130{
131 int pfd;
132
133 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
134 { 137 {
135 *ttydev = strdup (ttyname (pfd)); 138 *ttydev = strdup (slave);
136 return pfd; 139 return pfd;
137 } 140 }
138 141
139 return -1; 142 return -1;
140}
141#elif defined(HAVE_DEV_CLONE)
142static int
143get_pty (int *fd_tty, char **ttydev)
144{
145 int pfd;
146
147 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
148 {
149 *ttydev = strdup (ptsname (pfd));
150 return pfd;
151 } 143 }
152 144
153 return -1;
154}
155#else 145#else
146
156/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 147 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
157static int 148 static int
158get_pty (int *fd_tty, char **ttydev) 149 get_pty (int *fd_tty, char **ttydev)
159{ 150 {
160 int pfd; 151 int pfd;
161 int i; 152 int i;
162 char pty_name[32]; 153 char pty_name[32];
163 char tty_name[32]; 154 char tty_name[32];
164 const char *majors = "pqrstuvwxyzabcde"; 155 const char *majors = "pqrstuvwxyzabcde";
165 const char *minors = "0123456789abcdef"; 156 const char *minors = "0123456789abcdef";
157
166 for (i = 0; i < 256; i++) 158 for (i = 0; i < 256; i++)
167 { 159 {
168 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]);
169 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
170 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 163 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
171 { 164 {
172 snprintf(pty_name, 32, "/dev/ptyp%d", i); 165 snprintf (pty_name, 32, "/dev/ptyp%d", i);
173 snprintf(tty_name, 32, "/dev/ttyp%d", i); 166 snprintf (tty_name, 32, "/dev/ttyp%d", i);
174 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 167 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
175 continue; 168 continue;
176 } 169 }
170
177 if (access (tty_name, R_OK | W_OK) == 0) 171 if (access (tty_name, R_OK | W_OK) == 0)
178 { 172 {
179 *ttydev = strdup (tty_name); 173 *ttydev = strdup (tty_name);
180 return pfd; 174 return pfd;
181 } 175 }
182 176
183 close (pfd); 177 close (pfd);
184 } 178 }
185} 179
180 return -1;
181 }
182
186#endif 183#endif
187 184
188/*----------------------------------------------------------------------*/ 185/*----------------------------------------------------------------------*/
189/* 186/*
190 * Returns tty file descriptor, or -1 on failure 187 * Returns tty file descriptor, or -1 on failure
191 */ 188 */
192static int 189static int
193get_tty (char *ttydev) 190get_tty (char *ttydev)
194{ 191{
195 return open (ttydev, O_RDWR | O_NOCTTY, 0); 192 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
200 * 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
201 */ 198 */
202static int 199static int
203control_tty (int fd_tty) 200control_tty (int fd_tty)
204{ 201{
202 int fd;
203
205 setsid (); 204 setsid ();
206 205
207#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)
208 /* 352 /*
209 * Push STREAMS modules: 353 * Push STREAMS modules:
210 * ptem: pseudo-terminal hardware emulation module. 354 * ptem: pseudo-terminal hardware emulation module.
211 * ldterm: standard terminal line discipline. 355 * ldterm: standard terminal line discipline.
212 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 356 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
213 * 357 *
214 * 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
215 * (i.e. the next section between the dashes giving us "tty opened OK")
216 * should make the "ptem" (or "ldterm" depending upon either which OS 359 * should make the "ptem" (or "ldterm" depending upon either which OS
217 * 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
218 * controlling terminal. We must already have close ()d the master side 361 * controlling terminal. We must already have close ()d the master side
219 * 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
220 * documentation is really unclear about whether it is any close () on 363 * documentation is really unclear about whether it is any close () on
221 * 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
222 * 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
223 * through - Geoff Wing 366 * through - Geoff Wing
224 */ 367 */
225# ifdef HAVE_ISASTREAM 368#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
226 if (isastream (fd_tty) == 1) 369 if (isastream (tty) == 1)
227# endif 370# endif
228 { 371 {
229 ioctl (fd_tty, I_PUSH, "ptem"); 372 ioctl (tty, I_PUSH, "ptem");
230 ioctl (fd_tty, I_PUSH, "ldterm"); 373 ioctl (tty, I_PUSH, "ldterm");
231 ioctl (fd_tty, I_PUSH, "ttcompat"); 374 ioctl (tty, I_PUSH, "ttcompat");
232 }
233#endif
234
235 ioctl (fd_tty, TIOCSCTTY, NULL);
236
237 int fd = open ("/dev/tty", O_WRONLY);
238 if (fd < 0)
239 return -1; /* fatal */
240
241 close (fd);
242
243 return 0;
244}
245
246void
247ptytty::close_tty ()
248{
249 if (tty < 0)
250 return;
251
252 close (tty);
253 tty = -1;
254}
255
256bool
257ptytty::make_controlling_tty ()
258{
259 return control_tty (tty) >= 0;
260}
261
262void
263ptytty::set_utf8_mode (bool on)
264{
265#ifdef IUTF8
266 if (pty < 0)
267 return;
268
269 struct termios tio;
270
271 if (tcgetattr (pty, &tio) != -1)
272 { 375 }
273 tcflag_t new_cflag = tio.c_iflag;
274
275 if (on)
276 new_cflag |= IUTF8;
277 else
278 new_cflag &= ~IUTF8;
279
280 if (new_cflag != tio.c_iflag)
281 {
282 tio.c_iflag = new_cflag;
283 tcsetattr (pty, TCSANOW, &tio);
284 }
285 }
286#endif 376#endif
287}
288 377
289static struct ttyconf {
290 gid_t gid;
291 mode_t mode;
292
293 ttyconf ()
294 {
295#ifdef TTY_GID_SUPPORT
296 struct group *gr = getgrnam ("tty");
297
298 if (gr)
299 { /* change group ownership of tty to "tty" */
300 mode = S_IRUSR | S_IWUSR | S_IWGRP;
301 gid = gr->gr_gid;
302 }
303 else
304#endif /* TTY_GID_SUPPORT */
305 {
306 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
307 gid = 0;
308 }
309 }
310} ttyconf;
311
312ptytty_unix::ptytty_unix ()
313{
314 name = 0;
315#if UTMP_SUPPORT 378#if UTMP_SUPPORT
316 cmd_pid = 0; 379# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
317#endif 380 int fd_stdin = dup (STDIN_FILENO);
318} 381 dup2 (tty, STDIN_FILENO);
319 382
320ptytty_unix::~ptytty_unix () 383 utmp_pos = ttyslot ();
321{
322#if UTMP_SUPPORT
323 logout ();
324#endif
325 put ();
326}
327 384
328void 385 dup2 (fd_stdin, STDIN_FILENO);
329ptytty_unix::put () 386 close (fd_stdin);
330{
331 chmod (name, RESTORE_TTY_MODE);
332 chown (name, 0, ttyconf.gid);
333
334 close_tty ();
335
336 if (pty >= 0)
337 close (pty);
338
339 free (name);
340
341 pty = tty = -1;
342 name = 0;
343}
344
345bool
346ptytty_unix::get ()
347{
348 /* get master (pty) */
349 if ((pty = get_pty (&tty, &name)) < 0)
350 return false;
351
352 fcntl (pty, F_SETFL, O_NONBLOCK);
353
354 /* get slave (tty) */
355 if (tty < 0)
356 {
357#ifndef NO_SETOWNER_TTYDEV
358 chown (name, getuid (), ttyconf.gid); /* fail silently */
359 chmod (name, ttyconf.mode);
360# ifdef HAVE_REVOKE
361 revoke (name);
362# endif 387# endif
363#endif 388#endif
364 389
365 if ((tty = get_tty (name)) < 0)
366 {
367 put ();
368 return false;
369 }
370 }
371
372 return true; 390 return true;
373} 391}
374 392
375#if PTYTTY_HELPER
376
377static int sock_fd = -1;
378static int helper_pid, owner_pid;
379
380struct command
381{
382 enum { get, login, destroy } type;
383
384 ptytty *id;
385
386 bool login_shell;
387 int cmd_pid;
388 char hostname[512]; // arbitrary, but should be plenty
389};
390
391struct ptytty_proxy : ptytty
392{
393 ptytty *id;
394
395 ptytty_proxy ()
396 : id(0)
397 {
398 }
399
400 ~ptytty_proxy ();
401
402 bool get ();
403 void login (int cmd_pid, bool login_shell, const char *hostname);
404};
405
406bool
407ptytty_proxy::get ()
408{
409 command cmd;
410
411 cmd.type = command::get;
412
413 write (sock_fd, &cmd, sizeof (cmd));
414
415 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
416 fatal ("protocol error while creating pty using helper process, aborting.\n");
417
418 if (!id)
419 return false;
420
421 if ((pty = recv_fd (sock_fd)) < 0
422 || (tty = recv_fd (sock_fd)) < 0)
423 fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
424
425 return true;
426}
427
428void
429ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
430{
431 command cmd;
432
433 cmd.type = command::login;
434 cmd.id = id;
435 cmd.cmd_pid = cmd_pid;
436 cmd.login_shell = login_shell;
437 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
438
439 write (sock_fd, &cmd, sizeof (cmd));
440}
441
442ptytty_proxy::~ptytty_proxy ()
443{
444 if (id)
445 {
446 command cmd;
447
448 cmd.type = command::destroy;
449 cmd.id = id;
450
451 write (sock_fd, &cmd, sizeof (cmd));
452 }
453}
454
455static
456void serve ()
457{
458 command cmd;
459 vector<ptytty *> ptys;
460
461 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
462 {
463 if (cmd.type == command::get)
464 {
465 // -> id ptyfd ttyfd
466 cmd.id = new ptytty_unix;
467
468 if (cmd.id->get ())
469 {
470 write (sock_fd, &cmd.id, sizeof (cmd.id));
471 ptys.push_back (cmd.id);
472
473 ptytty::send_fd (sock_fd, cmd.id->pty);
474 ptytty::send_fd (sock_fd, cmd.id->tty);
475 }
476 else
477 {
478 delete cmd.id;
479 cmd.id = 0;
480 write (sock_fd, &cmd.id, sizeof (cmd.id));
481 }
482 }
483 else if (cmd.type == command::login)
484 {
485#if UTMP_SUPPORT
486 if (find (ptys.begin (), ptys.end (), cmd.id))
487 {
488 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
489 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
490 }
491#endif
492 }
493 else if (cmd.type == command::destroy)
494 {
495 vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id);
496
497 if (pty != ptys.end ())
498 {
499 delete *pty;
500 ptys.erase (pty);
501 }
502 }
503 else
504 break;
505 }
506
507 // destroy all ptys
508 for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); )
509 delete *i;
510}
511
512void
513ptytty::use_helper ()
514{
515 int pid = getpid ();
516
517 if (sock_fd >= 0 && pid == owner_pid)
518 return;
519
520 owner_pid = pid;
521
522 int sv[2];
523
524 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
525 fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
526
527 helper_pid = fork ();
528
529 if (helper_pid < 0)
530 fatal ("could not create pty/sessiondb helper process, aborting.\n");
531
532 if (helper_pid)
533 {
534 // client, process
535 sock_fd = sv[0];
536 close (sv[1]);
537 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
538 }
539 else
540 {
541 // server, pty-helper
542 sock_fd = sv[1];
543
544 chdir ("/");
545
546 for (int fd = 0; fd < 1023; fd++)
547 if (fd != sock_fd)
548 close (fd);
549
550 serve ();
551 _exit (EXIT_SUCCESS);
552 }
553}
554
555#endif
556
557ptytty *
558ptytty::create ()
559{
560#if PTYTTY_HELPER
561 if (helper_pid && getpid () == owner_pid)
562 // use helper process
563 return new ptytty_proxy;
564 else
565#endif
566 return new ptytty_unix;
567}
568
569

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