libptytty/src/ptytty.C

/*----------------------------------------------------------------------*
 * File:        ptytty.C
 *----------------------------------------------------------------------*
 *
 * All portions of code are copyright by their respective author/s.
 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
 * Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
 * Copyright (c) 2006      Emanuele Giaquinta <e.giaquinta@glauco.it>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *---------------------------------------------------------------------*/

#include "config.h"

#include "ptytty.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_STROPTS_H
# include <stropts.h>
#endif
#if defined(HAVE_PTY_H)
# include <pty.h>
#elif defined(HAVE_LIBUTIL_H)
# include <libutil.h>
#elif defined(HAVE_UTIL_H)
# include <util.h>
#endif
#ifdef TTY_GID_SUPPORT
#include <grp.h>
#endif

#ifndef O_NOCTTY
# define O_NOCTTY 0
#endif

/////////////////////////////////////////////////////////////////////////////

/* ------------------------------------------------------------------------- *
 *                  GET PSEUDO TELETYPE - MASTER AND SLAVE                   *
 * ------------------------------------------------------------------------- */
/*
 * Returns pty file descriptor, or -1 on failure
 * If successful, ttydev is set to the name of the slave device.
 * fd_tty _may_ also be set to an open fd to the slave device
 */
#if defined(UNIX98_PTY)

  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;

# if defined(HAVE_GETPT)
    pfd = getpt ();
# elif defined(HAVE_POSIX_OPENPT)
    pfd = posix_openpt (O_RDWR | O_NOCTTY);
# else
#  ifdef _AIX
    pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
#  else
    pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
#  endif
# endif

    if (pfd >= 0)
      {
        if (grantpt (pfd) == 0  /* change slave permissions */
            && unlockpt (pfd) == 0)
          {
            /* slave now unlocked */
            *ttydev = strdup (ptsname (pfd));   /* get slave's name */
            return pfd;
          }

        close (pfd);
      }

    return -1;
  }

#elif defined(HAVE_OPENPTY)

  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;
    int res;

    res = openpty (&pfd, fd_tty, NULL, NULL, NULL);

    if (res != -1)
      {
        *ttydev = strdup (ttyname (*fd_tty));
        return pfd;
      }

    return -1;
  }

#elif defined(HAVE__GETPTY)

  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;
    char *slave;

    slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);

    if (slave != NULL)
      {
        *ttydev = strdup (slave);
        return pfd;
      }

    return -1;
  }

#else
# define SET_TTY_OWNER

  /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;
    int i;
    char pty_name[32];
    char tty_name[32];
    const char *majors = "pqrstuvwxyzabcde";
    const char *minors = "0123456789abcdef";

    for (i = 0; i < 256; i++)
      {
        snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
        snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);

        if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
          {
            snprintf (pty_name, 32, "/dev/ptyp%d", i);
            snprintf (tty_name, 32, "/dev/ttyp%d", i);
            if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
              continue;
          }

        if (access (tty_name, R_OK | W_OK) == 0)
          {
            *ttydev = strdup (tty_name);
            return pfd;
          }

        close (pfd);
      }

    return -1;
  }

#endif

/*----------------------------------------------------------------------*/
/*
 * Returns tty file descriptor, or -1 on failure
 */
static int
get_tty (char *ttydev)
{
  return open (ttydev, O_RDWR | O_NOCTTY, 0);
}

/*----------------------------------------------------------------------*/
/*
 * Make our tty a controlling tty so that /dev/tty points to us
 */
static int
control_tty (int fd_tty)
{
  int fd;

  setsid ();

#ifdef TIOCSCTTY
  ioctl (fd_tty, TIOCSCTTY, NULL);
#else
  fd = open (ttyname (fd_tty), O_RDWR);
  if (fd >= 0)
    close (fd);
#endif

  fd = open ("/dev/tty", O_WRONLY);
  if (fd < 0)
    return -1; /* fatal */

  close (fd);

  return 0;
}

void
ptytty::close_tty ()
{
  if (tty < 0)
    return;

  close (tty);
  tty = -1;
}

bool
ptytty::make_controlling_tty ()
{
  return control_tty (tty) >= 0;
}

void
ptytty::set_utf8_mode (bool on)
{
#ifdef IUTF8
  if (pty < 0)
    return;

  struct termios tio;

  if (tcgetattr (pty, &tio) != -1)
    {
      tcflag_t new_cflag = tio.c_iflag;

      if (on)
        new_cflag |= IUTF8;
      else
        new_cflag &= ~IUTF8;

      if (new_cflag != tio.c_iflag)
        {
          tio.c_iflag = new_cflag;
          tcsetattr (pty, TCSANOW, &tio);
        }
    }
#endif
}

static struct ttyconf
{
  gid_t gid;
  mode_t mode;

  ttyconf ()
  {
#ifdef TTY_GID_SUPPORT
    struct group *gr = getgrnam ("tty");

    if (gr)
      {
        /* change group ownership of tty to "tty" */
        mode = S_IRUSR | S_IWUSR | S_IWGRP;
        gid = gr->gr_gid;
      }
    else
#endif /* TTY_GID_SUPPORT */
      {
        mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
        gid = 0;
      }
  }
} ttyconf;

ptytty_unix::ptytty_unix ()
{
  name = 0;
#if UTMP_SUPPORT
  cmd_pid = 0;
#endif
}

ptytty_unix::~ptytty_unix ()
{
#if UTMP_SUPPORT
  if (cmd_pid)
    log_session (false, 0);
#endif
  put ();
}

void
ptytty_unix::put ()
{
  if (name)
    {
      chmod (name, RESTORE_TTY_MODE);
      chown (name, 0, ttyconf.gid);
    }

  close_tty ();

  if (pty >= 0)
    close (pty);

  free (name);

  pty = tty = -1;
  name = 0;
}

bool
ptytty_unix::get ()
{
  /* get master (pty) */
  if ((pty = get_pty (&tty, &name)) < 0)
    return false;

  /* get slave (tty) */
  if (tty < 0)
    {
#ifdef SET_TTY_OWNER
      chown (name, getuid (), ttyconf.gid);      /* fail silently */
      chmod (name, ttyconf.mode);
# ifdef HAVE_REVOKE
      revoke (name);
# endif
#endif

      if ((tty = get_tty (name)) < 0)
        {
          put ();
          return false;
        }
    }

#if defined(I_PUSH)
  /*
   * Push STREAMS modules:
   *    ptem: pseudo-terminal hardware emulation module.
   *    ldterm: standard terminal line discipline.
   *    ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
   *
   * On Solaris, a process can acquire a controlling terminal in the
   * following ways:
   * - open() of /dev/ptmx or of a slave device without O_NOCTTY
   * - I_PUSH ioctl() of the "ptem" or "ldterm" module on a slave device
   * The second case is problematic, because it cannot be disabled.
   * Fortunately, Solaris (10 and 11 at least) provides an undocumented
   * __IPUSH_NOCTTY ioctl which does not have this side-effect, so we
   * use it if defined. See
   * https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/os/streamio.c#L3755
   * https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/io/ptem.c#L203
   * https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/io/ldterm.c#L794
   * Note that an open() of a slave device autoloads the modules,
   * with __I_PUSH_NOCTTY, if xpg[46] mode is enabled (which requires
   * linking /usr/lib/values-xpg[46].o).
   * https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/lib/libc/port/sys/open.c#L173
   */

#ifdef __I_PUSH_NOCTTY
# define PT_I_PUSH __I_PUSH_NOCTTY
#else
# define PT_I_PUSH I_PUSH
#endif

#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
  if (isastream (tty) == 1)
# endif
    {
      if (!ioctl (tty, I_FIND, "ptem"))
        ioctl (tty, PT_I_PUSH, "ptem");

      if (!ioctl (tty, I_FIND, "ldterm"))
        ioctl (tty, PT_I_PUSH, "ldterm");

      if (!ioctl (tty, I_FIND, "ttcompat"))
        ioctl (tty, PT_I_PUSH, "ttcompat");
    }
#endif

#if defined(USE_UTMP) && !defined(HAVE_UTMP_PID)
  int fd_stdin = dup (STDIN_FILENO);
  dup2 (tty, STDIN_FILENO);

  utmp_pos = ttyslot ();

  dup2 (fd_stdin, STDIN_FILENO);
  close (fd_stdin);
#endif

  return true;
}

void
ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname)
{
#if UTMP_SUPPORT
  if (!name || !*name)
    return;

  this->cmd_pid     = cmd_pid;
  this->login_shell = login_shell;

  log_session (true, hostname);
#endif
}
Revision:	1.60
Committed:	Fri Jul 23 10:15:08 2021 UTC (5 years, 1 month ago) by sf-exg
Content type:	text/plain
Branch:	MAIN
Changes since 1.59:	+2 -1 lines
Log Message:	Simplify
#	User	Rev	Content
1	root	1.8	/----------------------------------------------------------------------
2	root	1.1	* File: ptytty.C
3			----------------------------------------------------------------------
4			*
5			* All portions of code are copyright by their respective author/s.
6			* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7	sf-exg	1.38	* Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
8	root	1.12	* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
9	root	1.1	*
10			* This program is free software; you can redistribute it and/or modify
11			* it under the terms of the GNU General Public License as published by
12	sf-exg	1.54	* the Free Software Foundation; either version 2 of the License, or
13	root	1.1	* (at your option) any later version.
14			*
15			* This program is distributed in the hope that it will be useful,
16			* but WITHOUT ANY WARRANTY; without even the implied warranty of
17			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18			* GNU General Public License for more details.
19			*
20			* You should have received a copy of the GNU General Public License
21			* along with this program; if not, write to the Free Software
22			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23			---------------------------------------------------------------------/
24
25	sf-exg	1.36	#include "config.h"
26	root	1.1
27	root	1.3	#include "ptytty.h"
28
29	sf-exg	1.49	#include <stdlib.h>
30	sf-exg	1.51	#include <stdio.h>
31	sf-exg	1.50	#include <string.h>
32	root	1.2
33			#include <sys/types.h>
34	ayin	1.34	#include <sys/stat.h>
35	root	1.2	#include <unistd.h>
36			#include <fcntl.h>
37
38	root	1.1	#ifdef HAVE_SYS_IOCTL_H
39			# include <sys/ioctl.h>
40			#endif
41	sf-exg	1.52	#ifdef HAVE_STROPTS_H
42	root	1.1	# include <stropts.h>
43			#endif
44	root	1.2	#if defined(HAVE_PTY_H)
45	root	1.1	# include <pty.h>
46	root	1.2	#elif defined(HAVE_LIBUTIL_H)
47	root	1.1	# include <libutil.h>
48	root	1.2	#elif defined(HAVE_UTIL_H)
49	root	1.1	# include <util.h>
50			#endif
51	root	1.2	#ifdef TTY_GID_SUPPORT
52			#include <grp.h>
53			#endif
54	root	1.1
55	sf-exg	1.47	#ifndef O_NOCTTY
56			# define O_NOCTTY 0
57			#endif
58
59	root	1.2	/////////////////////////////////////////////////////////////////////////////
60	root	1.1
61			/* ------------------------------------------------------------------------- *
62			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
63			* ------------------------------------------------------------------------- */
64			/*
65	ayin	1.26	* Returns pty file descriptor, or -1 on failure
66	root	1.1	* 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
68			*/
69	root	1.2	#if defined(UNIX98_PTY)
70	root	1.25
71			static int
72			get_pty (int fd_tty, char *ttydev)
73			{
74			int pfd;
75	root	1.1
76	root	1.2	# if defined(HAVE_GETPT)
77	sf-exg	1.43	pfd = getpt ();
78	root	1.2	# elif defined(HAVE_POSIX_OPENPT)
79	sf-exg	1.41	pfd = posix_openpt (O_RDWR \| O_NOCTTY);
80	root	1.2	# else
81	sf-exg	1.40	# ifdef _AIX
82			pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0);
83			# else
84			pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
85			# endif
86	root	1.2	# endif
87	root	1.1
88	root	1.25	if (pfd >= 0)
89			{
90			if (grantpt (pfd) == 0 /* change slave permissions */
91			&& unlockpt (pfd) == 0)
92	ayin	1.32	{
93			/* slave now unlocked */
94	root	1.25	ttydev = strdup (ptsname (pfd)); / get slave's name */
95			return pfd;
96			}
97
98			close (pfd);
99			}
100
101			return -1;
102			}
103	root	1.2
104			#elif defined(HAVE_OPENPTY)
105	root	1.1
106	root	1.25	static int
107			get_pty (int fd_tty, char *ttydev)
108			{
109			int pfd;
110			int res;
111	ayin	1.26
112	ayin	1.29	res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
113	root	1.25
114			if (res != -1)
115			{
116	ayin	1.29	ttydev = strdup (ttyname (fd_tty));
117	root	1.25	return pfd;
118			}
119
120			return -1;
121			}
122
123	root	1.2	#elif defined(HAVE__GETPTY)
124
125	root	1.25	static int
126			get_pty (int fd_tty, char *ttydev)
127			{
128			int pfd;
129	ayin	1.30	char *slave;
130	root	1.25
131	sf-exg	1.42	slave = _getpty (&pfd, O_RDWR \| O_NOCTTY, 0622, 0);
132	root	1.25
133	ayin	1.33	if (slave != NULL)
134			{
135			*ttydev = strdup (slave);
136			return pfd;
137			}
138	root	1.25
139			return -1;
140			}
141	root	1.1
142	root	1.2	#else
143	sf-exg	1.60	# define SET_TTY_OWNER
144	root	1.1
145	root	1.25	/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
146			static int
147			get_pty (int fd_tty, char *ttydev)
148			{
149			int pfd;
150			int i;
151			char pty_name[32];
152			char tty_name[32];
153			const char *majors = "pqrstuvwxyzabcde";
154			const char *minors = "0123456789abcdef";
155
156			for (i = 0; i < 256; i++)
157			{
158	sf-exg	1.43	snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
159			snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
160	root	1.25
161			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
162			{
163	sf-exg	1.43	snprintf (pty_name, 32, "/dev/ptyp%d", i);
164			snprintf (tty_name, 32, "/dev/ttyp%d", i);
165	root	1.25	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
166			continue;
167			}
168
169			if (access (tty_name, R_OK \| W_OK) == 0)
170			{
171			*ttydev = strdup (tty_name);
172			return pfd;
173			}
174
175			close (pfd);
176			}
177
178			return -1;
179			}
180	ayin	1.24
181	root	1.1	#endif
182
183			/----------------------------------------------------------------------/
184			/*
185	ayin	1.26	* Returns tty file descriptor, or -1 on failure
186	root	1.1	*/
187			static int
188			get_tty (char *ttydev)
189			{
190			return open (ttydev, O_RDWR \| O_NOCTTY, 0);
191			}
192
193			/----------------------------------------------------------------------/
194			/*
195			* Make our tty a controlling tty so that /dev/tty points to us
196			*/
197			static int
198	root	1.2	control_tty (int fd_tty)
199	root	1.1	{
200	ayin	1.28	int fd;
201
202	root	1.1	setsid ();
203
204	ayin	1.27	#ifdef TIOCSCTTY
205	root	1.2	ioctl (fd_tty, TIOCSCTTY, NULL);
206	ayin	1.27	#else
207	ayin	1.28	fd = open (ttyname (fd_tty), O_RDWR);
208	ayin	1.27	if (fd >= 0)
209			close (fd);
210			#endif
211	root	1.2
212	ayin	1.28	fd = open ("/dev/tty", O_WRONLY);
213	root	1.1	if (fd < 0)
214	root	1.10	return -1; /* fatal */
215	root	1.2
216	root	1.1	close (fd);
217
218			return 0;
219			}
220
221	root	1.2	void
222	root	1.4	ptytty::close_tty ()
223	root	1.2	{
224			if (tty < 0)
225			return;
226
227			close (tty);
228			tty = -1;
229			}
230
231			bool
232	root	1.4	ptytty::make_controlling_tty ()
233	root	1.2	{
234			return control_tty (tty) >= 0;
235			}
236
237			void
238	root	1.4	ptytty::set_utf8_mode (bool on)
239	root	1.2	{
240			#ifdef IUTF8
241			if (pty < 0)
242			return;
243
244			struct termios tio;
245
246			if (tcgetattr (pty, &tio) != -1)
247			{
248			tcflag_t new_cflag = tio.c_iflag;
249
250			if (on)
251			new_cflag \|= IUTF8;
252			else
253			new_cflag &= ~IUTF8;
254
255			if (new_cflag != tio.c_iflag)
256			{
257			tio.c_iflag = new_cflag;
258			tcsetattr (pty, TCSANOW, &tio);
259			}
260			}
261			#endif
262			}
263
264	sf-exg	1.58	static struct ttyconf
265			{
266	root	1.1	gid_t gid;
267			mode_t mode;
268
269			ttyconf ()
270	sf-exg	1.58	{
271	root	1.1	#ifdef TTY_GID_SUPPORT
272	sf-exg	1.58	struct group *gr = getgrnam ("tty");
273	root	1.1
274	sf-exg	1.58	if (gr)
275			{
276			/* change group ownership of tty to "tty" */
277			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
278			gid = gr->gr_gid;
279			}
280			else
281	ayin	1.31	#endif /* TTY_GID_SUPPORT */
282	sf-exg	1.58	{
283			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
284			gid = 0;
285			}
286			}
287	root	1.1	} ttyconf;
288
289	root	1.4	ptytty_unix::ptytty_unix ()
290	root	1.1	{
291			name = 0;
292	root	1.2	#if UTMP_SUPPORT
293			cmd_pid = 0;
294	root	1.1	#endif
295			}
296
297	root	1.4	ptytty_unix::~ptytty_unix ()
298	root	1.1	{
299	root	1.2	#if UTMP_SUPPORT
300	sf-exg	1.57	if (cmd_pid)
301			log_session (false, 0);
302	root	1.2	#endif
303	root	1.1	put ();
304			}
305
306			void
307	root	1.4	ptytty_unix::put ()
308	root	1.2	{
309	root	1.25	if (name)
310			{
311			chmod (name, RESTORE_TTY_MODE);
312			chown (name, 0, ttyconf.gid);
313			}
314	root	1.1
315	root	1.2	close_tty ();
316	root	1.1
317	root	1.2	if (pty >= 0)
318			close (pty);
319	root	1.1
320			free (name);
321
322			pty = tty = -1;
323			name = 0;
324			}
325
326			bool
327	root	1.4	ptytty_unix::get ()
328	root	1.1	{
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	sf-exg	1.60	#ifdef SET_TTY_OWNER
337	root	1.2	chown (name, getuid (), ttyconf.gid); /* fail silently */
338			chmod (name, ttyconf.mode);
339			# ifdef HAVE_REVOKE
340			revoke (name);
341			# endif
342	root	1.1	#endif
343
344			if ((tty = get_tty (name)) < 0)
345			{
346			put ();
347			return false;
348			}
349			}
350
351	sf-exg	1.40	#if defined(I_PUSH)
352	sf-exg	1.39	/*
353			* Push STREAMS modules:
354			* ptem: pseudo-terminal hardware emulation module.
355			* ldterm: standard terminal line discipline.
356			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
357			*
358	sf-exg	1.55	* On Solaris, a process can acquire a controlling terminal in the
359			* following ways:
360			* - open() of /dev/ptmx or of a slave device without O_NOCTTY
361			* - I_PUSH ioctl() of the "ptem" or "ldterm" module on a slave device
362			* The second case is problematic, because it cannot be disabled.
363			* Fortunately, Solaris (10 and 11 at least) provides an undocumented
364			* __IPUSH_NOCTTY ioctl which does not have this side-effect, so we
365			* use it if defined. See
366	sf-exg	1.59	* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/os/streamio.c#L3755
367			* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/io/ptem.c#L203
368			* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/io/ldterm.c#L794
369	sf-exg	1.55	* Note that an open() of a slave device autoloads the modules,
370			* with __I_PUSH_NOCTTY, if xpg[46] mode is enabled (which requires
371			* linking /usr/lib/values-xpg[46].o).
372	sf-exg	1.59	* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/lib/libc/port/sys/open.c#L173
373	sf-exg	1.39	*/
374	sf-exg	1.55
375			#ifdef __I_PUSH_NOCTTY
376			# define PT_I_PUSH __I_PUSH_NOCTTY
377			#else
378			# define PT_I_PUSH I_PUSH
379			#endif
380
381	sf-exg	1.39	#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
382			if (isastream (tty) == 1)
383			# endif
384			{
385	sf-exg	1.56	if (!ioctl (tty, I_FIND, "ptem"))
386			ioctl (tty, PT_I_PUSH, "ptem");
387
388			if (!ioctl (tty, I_FIND, "ldterm"))
389			ioctl (tty, PT_I_PUSH, "ldterm");
390
391			if (!ioctl (tty, I_FIND, "ttcompat"))
392			ioctl (tty, PT_I_PUSH, "ttcompat");
393	sf-exg	1.39	}
394			#endif
395
396	sf-exg	1.57	#if defined(USE_UTMP) && !defined(HAVE_UTMP_PID)
397	sf-exg	1.44	int fd_stdin = dup (STDIN_FILENO);
398			dup2 (tty, STDIN_FILENO);
399
400			utmp_pos = ttyslot ();
401
402			dup2 (fd_stdin, STDIN_FILENO);
403			close (fd_stdin);
404			#endif
405
406	root	1.1	return true;
407			}
408
409	sf-exg	1.57	void
410			ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname)
411			{
412			#if UTMP_SUPPORT
413			if (!name \|\| !*name)
414			return;
415
416			this->cmd_pid = cmd_pid;
417			this->login_shell = login_shell;
418
419			log_session (true, hostname);
420			#endif
421			}