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

  /* 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)
    {
#ifndef NO_SETOWNER_TTYDEV
      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:	1.59
Committed:	Tue Jun 29 12:09:53 2021 UTC (5 years, 2 months ago) by sf-exg
Content type:	text/plain
Branch:	MAIN
Changes since 1.58:	+4 -4 lines
Log Message:	Update links
#	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	root	1.1
144	root	1.25	/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
145			static int
146			get_pty (int fd_tty, char *ttydev)
147			{
148			int pfd;
149			int i;
150			char pty_name[32];
151			char tty_name[32];
152			const char *majors = "pqrstuvwxyzabcde";
153			const char *minors = "0123456789abcdef";
154
155			for (i = 0; i < 256; i++)
156			{
157	sf-exg	1.43	snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
158			snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
159	root	1.25
160			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
161			{
162	sf-exg	1.43	snprintf (pty_name, 32, "/dev/ptyp%d", i);
163			snprintf (tty_name, 32, "/dev/ttyp%d", i);
164	root	1.25	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
165			continue;
166			}
167
168			if (access (tty_name, R_OK \| W_OK) == 0)
169			{
170			*ttydev = strdup (tty_name);
171			return pfd;
172			}
173
174			close (pfd);
175			}
176
177			return -1;
178			}
179	ayin	1.24
180	root	1.1	#endif
181
182			/----------------------------------------------------------------------/
183			/*
184	ayin	1.26	* Returns tty file descriptor, or -1 on failure
185	root	1.1	*/
186			static int
187			get_tty (char *ttydev)
188			{
189			return open (ttydev, O_RDWR \| O_NOCTTY, 0);
190			}
191
192			/----------------------------------------------------------------------/
193			/*
194			* Make our tty a controlling tty so that /dev/tty points to us
195			*/
196			static int
197	root	1.2	control_tty (int fd_tty)
198	root	1.1	{
199	ayin	1.28	int fd;
200
201	root	1.1	setsid ();
202
203	ayin	1.27	#ifdef TIOCSCTTY
204	root	1.2	ioctl (fd_tty, TIOCSCTTY, NULL);
205	ayin	1.27	#else
206	ayin	1.28	fd = open (ttyname (fd_tty), O_RDWR);
207	ayin	1.27	if (fd >= 0)
208			close (fd);
209			#endif
210	root	1.2
211	ayin	1.28	fd = open ("/dev/tty", O_WRONLY);
212	root	1.1	if (fd < 0)
213	root	1.10	return -1; /* fatal */
214	root	1.2
215	root	1.1	close (fd);
216
217			return 0;
218			}
219
220	root	1.2	void
221	root	1.4	ptytty::close_tty ()
222	root	1.2	{
223			if (tty < 0)
224			return;
225
226			close (tty);
227			tty = -1;
228			}
229
230			bool
231	root	1.4	ptytty::make_controlling_tty ()
232	root	1.2	{
233			return control_tty (tty) >= 0;
234			}
235
236			void
237	root	1.4	ptytty::set_utf8_mode (bool on)
238	root	1.2	{
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
263	sf-exg	1.58	static struct ttyconf
264			{
265	root	1.1	gid_t gid;
266			mode_t mode;
267
268			ttyconf ()
269	sf-exg	1.58	{
270	root	1.1	#ifdef TTY_GID_SUPPORT
271	sf-exg	1.58	struct group *gr = getgrnam ("tty");
272	root	1.1
273	sf-exg	1.58	if (gr)
274			{
275			/* change group ownership of tty to "tty" */
276			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
277			gid = gr->gr_gid;
278			}
279			else
280	ayin	1.31	#endif /* TTY_GID_SUPPORT */
281	sf-exg	1.58	{
282			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
283			gid = 0;
284			}
285			}
286	root	1.1	} ttyconf;
287
288	root	1.4	ptytty_unix::ptytty_unix ()
289	root	1.1	{
290			name = 0;
291	root	1.2	#if UTMP_SUPPORT
292			cmd_pid = 0;
293	root	1.1	#endif
294			}
295
296	root	1.4	ptytty_unix::~ptytty_unix ()
297	root	1.1	{
298	root	1.2	#if UTMP_SUPPORT
299	sf-exg	1.57	if (cmd_pid)
300			log_session (false, 0);
301	root	1.2	#endif
302	root	1.1	put ();
303			}
304
305			void
306	root	1.4	ptytty_unix::put ()
307	root	1.2	{
308	root	1.25	if (name)
309			{
310			chmod (name, RESTORE_TTY_MODE);
311			chown (name, 0, ttyconf.gid);
312			}
313	root	1.1
314	root	1.2	close_tty ();
315	root	1.1
316	root	1.2	if (pty >= 0)
317			close (pty);
318	root	1.1
319			free (name);
320
321			pty = tty = -1;
322			name = 0;
323			}
324
325			bool
326	root	1.4	ptytty_unix::get ()
327	root	1.1	{
328			/* get master (pty) */
329			if ((pty = get_pty (&tty, &name)) < 0)
330			return false;
331
332			/* get slave (tty) */
333			if (tty < 0)
334			{
335			#ifndef NO_SETOWNER_TTYDEV
336	root	1.2	chown (name, getuid (), ttyconf.gid); /* fail silently */
337			chmod (name, ttyconf.mode);
338			# ifdef HAVE_REVOKE
339			revoke (name);
340			# endif
341	root	1.1	#endif
342
343			if ((tty = get_tty (name)) < 0)
344			{
345			put ();
346			return false;
347			}
348			}
349
350	sf-exg	1.40	#if defined(I_PUSH)
351	sf-exg	1.39	/*
352			* Push STREAMS modules:
353			* ptem: pseudo-terminal hardware emulation module.
354			* ldterm: standard terminal line discipline.
355			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
356			*
357	sf-exg	1.55	* On Solaris, a process can acquire a controlling terminal in the
358			* following ways:
359			* - open() of /dev/ptmx or of a slave device without O_NOCTTY
360			* - I_PUSH ioctl() of the "ptem" or "ldterm" module on a slave device
361			* The second case is problematic, because it cannot be disabled.
362			* Fortunately, Solaris (10 and 11 at least) provides an undocumented
363			* __IPUSH_NOCTTY ioctl which does not have this side-effect, so we
364			* use it if defined. See
365	sf-exg	1.59	* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/os/streamio.c#L3755
366			* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/io/ptem.c#L203
367			* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/uts/common/io/ldterm.c#L794
368	sf-exg	1.55	* Note that an open() of a slave device autoloads the modules,
369			* with __I_PUSH_NOCTTY, if xpg[46] mode is enabled (which requires
370			* linking /usr/lib/values-xpg[46].o).
371	sf-exg	1.59	* https://github.com/illumos/illumos-gate/blob/19d32b9ab53d17ac6605971e14c45a5281f8d9bb/usr/src/lib/libc/port/sys/open.c#L173
372	sf-exg	1.39	*/
373	sf-exg	1.55
374			#ifdef __I_PUSH_NOCTTY
375			# define PT_I_PUSH __I_PUSH_NOCTTY
376			#else
377			# define PT_I_PUSH I_PUSH
378			#endif
379
380	sf-exg	1.39	#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
381			if (isastream (tty) == 1)
382			# endif
383			{
384	sf-exg	1.56	if (!ioctl (tty, I_FIND, "ptem"))
385			ioctl (tty, PT_I_PUSH, "ptem");
386
387			if (!ioctl (tty, I_FIND, "ldterm"))
388			ioctl (tty, PT_I_PUSH, "ldterm");
389
390			if (!ioctl (tty, I_FIND, "ttcompat"))
391			ioctl (tty, PT_I_PUSH, "ttcompat");
392	sf-exg	1.39	}
393			#endif
394
395	sf-exg	1.57	#if defined(USE_UTMP) && !defined(HAVE_UTMP_PID)
396	sf-exg	1.44	int fd_stdin = dup (STDIN_FILENO);
397			dup2 (tty, STDIN_FILENO);
398
399			utmp_pos = ttyslot ();
400
401			dup2 (fd_stdin, STDIN_FILENO);
402			close (fd_stdin);
403			#endif
404
405	root	1.1	return true;
406			}
407
408	sf-exg	1.57	void
409			ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname)
410			{
411			#if UTMP_SUPPORT
412			if (!name \|\| !*name)
413			return;
414
415			this->cmd_pid = cmd_pid;
416			this->login_shell = login_shell;
417
418			log_session (true, hostname);
419			#endif
420			}