rxvt-unicode/src/ptytty.C

/*--------------------------------*-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 <pcg@goof.com>
 *
 * 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"          /* NECESSARY */
#include "rxvt.h"

# include <cstdlib>
# include <cstring>

#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
# include <sys/stropts.h>      /* for I_PUSH */
#endif
#ifdef HAVE_ISASTREAM
# 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

#include <cstdio>
#include <grp.h>

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

#ifdef PTYS_ARE_OPENPTY
  char tty_name[sizeof "/dev/pts/????\0"];

  rxvt_privileges(RESTORE);
  int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
  rxvt_privileges(IGNORE);

  if (res != -1)
    {
      *ttydev = strdup (tty_name);
      return pfd;
    }
#endif

#ifdef PTYS_ARE__GETPTY
  *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
  if (*ttydev != NULL)
    return pfd;
#endif

#ifdef PTYS_ARE_GETPTY
  char           *ptydev;

  while ((ptydev = getpty ()) != NULL)
    if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
      {
        *ttydev = ptydev;
        return pfd;
      }
#endif

#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)

  {
#  ifdef PTYS_ARE_GETPT
    pfd = getpt ();
#  else
    pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
#  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);
      }
  }
# endif
#endif

#ifdef PTYS_ARE_PTC
  if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
    {
      *ttydev = strdup (ttyname (pfd));
      return pfd;
    }
#endif

#ifdef PTYS_ARE_CLONE
  if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
    {
      *ttydev = strdup (ptsname (pfd));
      return pfd;
    }
#endif

#ifdef PTYS_ARE_NUMERIC
  {
    int idx;
    char *c1, *c2;
    char pty_name[] = "/dev/ptyp???";
    char tty_name[] = "/dev/ttyp???";

    c1 = &(pty_name[sizeof (pty_name) - 4]);
    c2 = &(tty_name[sizeof (tty_name) - 4]);
    for (idx = 0; idx < 256; idx++)
      {
        sprintf (c1, "%d", idx);
        sprintf (c2, "%d", idx);
        if (access (tty_name, F_OK) < 0)
          {
            idx = 256;
            break;
          }

        if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
          {
            if (access (tty_name, R_OK | W_OK) == 0)
              {
                *ttydev = strdup (tty_name);
                return pfd;
              }

            close (pfd);
          }
      }
  }
#endif

#ifdef PTYS_ARE_SEARCHED
  {
    const char *c1, *c2;
    char pty_name[] = "/dev/pty??";
    char tty_name[] = "/dev/tty??";

# ifndef PTYCHAR1
#  define PTYCHAR1      "pqrstuvwxyz"
# endif
# ifndef PTYCHAR2
#  define PTYCHAR2      "0123456789abcdef"
# endif

    for (c1 = PTYCHAR1; *c1; c1++)
      {
        pty_name[ (sizeof (pty_name) - 3)] =
          tty_name[ (sizeof (pty_name) - 3)] = *c1;
        for (c2 = PTYCHAR2; *c2; c2++)
          {
            pty_name[ (sizeof (pty_name) - 2)] =
              tty_name[ (sizeof (pty_name) - 2)] = *c2;
            if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
              {
                if (access (tty_name, R_OK | W_OK) == 0)
                  {
                    *ttydev = strdup (tty_name);
                    return pfd;
                  }

                close (pfd);
              }
          }
      }
  }
#endif

  return -1;
}

/*----------------------------------------------------------------------*/
/*
 * 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, const char *ttydev)
{
#ifndef __QNX__
  int fd;

  /* ---------------------------------------- */
# ifdef HAVE_SETSID
  setsid ();
# endif
# if defined(HAVE_SETPGID)
  setpgid (0, 0);
# elif defined(HAVE_SETPGRP)
  setpgrp (0, 0);
# endif

  /* ---------------------------------------- */
# ifdef TIOCNOTTY
  fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
  if (fd >= 0)
    {
      ioctl (fd, TIOCNOTTY, NULL);      /* void tty associations */
      close (fd);
    }
# endif

  /* ---------------------------------------- */
  fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
  if (fd >= 0)
    close (fd);         /* ouch: still have controlling tty */

  /* ---------------------------------------- */
#if defined(PTYS_ARE_PTMX) && 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.
   *
   * After we push the STREAMS modules, the first open () on the slave side
   * (i.e. the next section between the dashes giving us "tty opened OK")
   * should make the "ptem" (or "ldterm" depending upon either which OS
   * version or which set of manual pages you have) module give us a
   * controlling terminal.  We must already have close ()d the master side
   * fd in this child process before we push STREAMS modules on because the
   * documentation is really unclear about whether it is any close () on
   * the master side or the last close () - i.e. a proper STREAMS dismantling
   * close () - on the master side which causes a hang up to be sent
   * through - Geoff Wing
   */
# ifdef HAVE_ISASTREAM
  if (isastream (fd_tty) == 1)
# endif
    {
      ioctl (fd_tty, I_PUSH, "ptem");
      ioctl (fd_tty, I_PUSH, "ldterm");
      ioctl (fd_tty, I_PUSH, "ttcompat");
    }
#endif
  /* ---------------------------------------- */
# if defined(TIOCSCTTY)
  fd = ioctl (fd_tty, TIOCSCTTY, NULL);
# elif defined(TIOCSETCTTY)
  fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
# else
  fd = open (ttydev, O_RDWR);
  if (fd >= 0)
    close (fd);
# endif
  /* ---------------------------------------- */
  fd = open ("/dev/tty", O_WRONLY);
  if (fd < 0)
    return -1;          /* fatal */
  close (fd);
  /* ---------------------------------------- */
#endif                          /* ! __QNX__ */

  return 0;
}

#ifndef NO_SETOWNER_TTYDEV
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 = getgid ();
        }
    }
} ttyconf;

void
rxvt_ptytty::privileges (rxvt_privaction action)
{
  if (!name || !*name)
    return;

  rxvt_privileges (RESTORE);

  if (action == SAVE)
    {
# ifndef RESET_TTY_TO_COMMON_DEFAULTS
      /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
      if (lstat (name, &savestat) < 0)       /* you lose out */
        ;
      else
# endif
        {
          saved = true;
          chown (name, getuid (), ttyconf.gid);      /* fail silently */
          chmod (name, ttyconf.mode);
# ifdef HAVE_REVOKE
          revoke (name);
# endif
        }
    }
  else
    {                    /* action == RESTORE */
# ifndef RESET_TTY_TO_COMMON_DEFAULTS
      if (saved)
        {
          chmod (name, savestat.st_mode);
          chown (name, savestat.st_uid, savestat.st_gid);
        }
# else
      chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH));
      chown (name, 0, 0);
# endif

    }

  rxvt_privileges (IGNORE);
}
#endif

rxvt_ptytty::rxvt_ptytty ()
{
  pty = tty = -1;
  name = 0;
#ifndef NO_SETOWNER_TTYDEV
  saved = false;
#endif
}

rxvt_ptytty::~rxvt_ptytty ()
{
  put ();
}

void

rxvt_ptytty::close_tty ()
{
  if (tty < 0)
    return;

  close (tty);
  tty = -1;
}

void
rxvt_ptytty::put ()
{
#ifndef NO_SETOWNER_TTYDEV
  privileges (RESTORE);
#endif

  if (pty >= 0) close (pty);
  close_tty ();
  free (name);

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

bool
rxvt_ptytty::make_controlling_tty ()
{
  return control_tty (tty, name) >= 0;
}

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

  fcntl (pty, F_SETFL, O_NONBLOCK);

  /* get slave (tty) */
  if (tty < 0)
    {
#ifndef NO_SETOWNER_TTYDEV
      privileges (SAVE);
#endif

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

  return true;
}

void
rxvt_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
}

/*----------------------- end-of-file (C source) -----------------------*/

Revision:	1.31
Committed:	Tue Jan 10 18:09:22 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.30:	+5 -11 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/---------------------------------C----------------------------------
2	pcg	1.11	* File: ptytty.C
3	pcg	1.1	----------------------------------------------------------------------
4			*
5			* All portions of code are copyright by their respective author/s.
6			* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7	root	1.30	* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
8	pcg	1.1	*
9			* 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			* the Free Software Foundation; either version 2 of the License, or
12			* (at your option) any later version.
13			*
14			* This program is distributed in the hope that it will be useful,
15			* but WITHOUT ANY WARRANTY; without even the implied warranty of
16			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17			* GNU General Public License for more details.
18			*
19			* 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			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22			---------------------------------------------------------------------/
23
24			#include "../config.h" /* NECESSARY */
25	root	1.16	#include "rxvt.h"
26	pcg	1.1
27	pcg	1.8	# include <cstdlib>
28	root	1.31	# include <cstring>
29
30	pcg	1.1	#ifdef HAVE_SYS_TYPES_H
31			# include <sys/types.h>
32			#endif
33			#ifdef HAVE_UNISTD_H
34			# include <unistd.h>
35			#endif
36			#ifdef HAVE_FCNTL_H
37			# include <fcntl.h>
38			#endif
39			#ifdef HAVE_SYS_IOCTL_H
40			# include <sys/ioctl.h>
41			#endif
42	root	1.12	#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
43	pcg	1.1	# include <sys/stropts.h> /* for I_PUSH */
44			#endif
45	pcg	1.10	#ifdef HAVE_ISASTREAM
46			# include <stropts.h>
47			#endif
48	root	1.31	#if defined(HAVE_PTY_H)
49	root	1.22	# include <pty.h>
50	root	1.31	#elif defined(HAVE_LIBUTIL_H)
51	root	1.16	# include <libutil.h>
52	root	1.31	#elif defined(HAVE_UTIL_H)
53	root	1.17	# include <util.h>
54	pcg	1.1	#endif
55
56	root	1.16	#include <cstdio>
57			#include <grp.h>
58
59	pcg	1.1	/* ------------------------------------------------------------------------- *
60			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
61			* ------------------------------------------------------------------------- */
62			/*
63			* Returns pty file descriptor, or -1 on failure
64			* If successful, ttydev is set to the name of the slave device.
65			* fd_tty _may_ also be set to an open fd to the slave device
66			*/
67	root	1.16	static int
68			get_pty (int fd_tty, char *ttydev)
69	pcg	1.1	{
70	pcg	1.4	int pfd;
71	pcg	1.1
72			#ifdef PTYS_ARE_OPENPTY
73	root	1.26	char tty_name[sizeof "/dev/pts/????\0"];
74	pcg	1.4
75	root	1.27	rxvt_privileges(RESTORE);
76			int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
77			rxvt_privileges(IGNORE);
78
79			if (res != -1)
80	pcg	1.4	{
81	pcg	1.6	*ttydev = strdup (tty_name);
82	pcg	1.4	return pfd;
83	pcg	1.1	}
84			#endif
85
86			#ifdef PTYS_ARE__GETPTY
87	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
88	pcg	1.4	if (*ttydev != NULL)
89			return pfd;
90	pcg	1.1	#endif
91
92			#ifdef PTYS_ARE_GETPTY
93	pcg	1.4	char *ptydev;
94
95	pcg	1.6	while ((ptydev = getpty ()) != NULL)
96			if ((pfd = open (ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0)
97	pcg	1.4	{
98			*ttydev = ptydev;
99			return pfd;
100			}
101	pcg	1.1	#endif
102
103			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
104			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
105	pcg	1.4
106			{
107	pcg	1.1	# ifdef PTYS_ARE_GETPT
108	pcg	1.6	pfd = getpt ();
109	pcg	1.1	# else
110	pcg	1.6	pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
111	pcg	1.1	# endif
112	pcg	1.4
113			if (pfd >= 0)
114			{
115	pcg	1.6	if (grantpt (pfd) == 0 /* change slave permissions */
116			&& unlockpt (pfd) == 0)
117	pcg	1.4	{ /* slave now unlocked */
118	root	1.16	ttydev = strdup (ptsname (pfd)); / get slave's name */
119	pcg	1.4	return pfd;
120			}
121	pcg	1.6	close (pfd);
122	pcg	1.4	}
123			}
124	pcg	1.1	# endif
125			#endif
126
127			#ifdef PTYS_ARE_PTC
128	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
129	pcg	1.4	{
130	root	1.16	*ttydev = strdup (ttyname (pfd));
131	pcg	1.4	return pfd;
132	pcg	1.1	}
133			#endif
134
135			#ifdef PTYS_ARE_CLONE
136	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
137	pcg	1.4	{
138	root	1.16	*ttydev = strdup (ptsname (pfd));
139	pcg	1.4	return pfd;
140	pcg	1.1	}
141			#endif
142
143			#ifdef PTYS_ARE_NUMERIC
144	pcg	1.4	{
145	root	1.16	int idx;
146			char c1, c2;
147			char pty_name[] = "/dev/ptyp???";
148			char tty_name[] = "/dev/ttyp???";
149	pcg	1.4
150	root	1.16	c1 = &(pty_name[sizeof (pty_name) - 4]);
151			c2 = &(tty_name[sizeof (tty_name) - 4]);
152	pcg	1.4	for (idx = 0; idx < 256; idx++)
153			{
154	pcg	1.6	sprintf (c1, "%d", idx);
155			sprintf (c2, "%d", idx);
156			if (access (tty_name, F_OK) < 0)
157	pcg	1.4	{
158			idx = 256;
159			break;
160			}
161	root	1.16
162	pcg	1.6	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
163	pcg	1.4	{
164	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
165	pcg	1.4	{
166	pcg	1.6	*ttydev = strdup (tty_name);
167	pcg	1.4	return pfd;
168			}
169	root	1.16
170	pcg	1.6	close (pfd);
171	pcg	1.4	}
172			}
173			}
174	pcg	1.1	#endif
175	root	1.16
176	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
177	pcg	1.4	{
178	root	1.16	const char c1, c2;
179			char pty_name[] = "/dev/pty??";
180			char tty_name[] = "/dev/tty??";
181	pcg	1.1
182			# ifndef PTYCHAR1
183			# define PTYCHAR1 "pqrstuvwxyz"
184			# endif
185			# ifndef PTYCHAR2
186			# define PTYCHAR2 "0123456789abcdef"
187			# endif
188	pcg	1.4
189			for (c1 = PTYCHAR1; *c1; c1++)
190			{
191	pcg	1.6	pty_name[ (sizeof (pty_name) - 3)] =
192			tty_name[ (sizeof (pty_name) - 3)] = *c1;
193	pcg	1.4	for (c2 = PTYCHAR2; *c2; c2++)
194			{
195	pcg	1.6	pty_name[ (sizeof (pty_name) - 2)] =
196			tty_name[ (sizeof (pty_name) - 2)] = *c2;
197			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
198	pcg	1.4	{
199	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
200	pcg	1.4	{
201	pcg	1.6	*ttydev = strdup (tty_name);
202	pcg	1.4	return pfd;
203			}
204	root	1.16
205	pcg	1.6	close (pfd);
206	pcg	1.4	}
207			}
208			}
209			}
210	pcg	1.1	#endif
211	root	1.16
212	pcg	1.4	return -1;
213	pcg	1.1	}
214
215			/----------------------------------------------------------------------/
216			/*
217			* Returns tty file descriptor, or -1 on failure
218			*/
219	root	1.16	static int
220			get_tty (char *ttydev)
221	pcg	1.1	{
222	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
223	pcg	1.1	}
224
225			/----------------------------------------------------------------------/
226			/*
227			* Make our tty a controlling tty so that /dev/tty points to us
228			*/
229	root	1.16	static int
230			control_tty (int fd_tty, const char *ttydev)
231	pcg	1.1	{
232			#ifndef __QNX__
233	pcg	1.4	int fd;
234	pcg	1.1
235	pcg	1.4	/* ---------------------------------------- */
236	pcg	1.1	# ifdef HAVE_SETSID
237	pcg	1.4	setsid ();
238	pcg	1.1	# endif
239			# if defined(HAVE_SETPGID)
240	pcg	1.4	setpgid (0, 0);
241	pcg	1.1	# elif defined(HAVE_SETPGRP)
242	pcg	1.4	setpgrp (0, 0);
243	pcg	1.1	# endif
244	root	1.16
245	pcg	1.4	/* ---------------------------------------- */
246	pcg	1.1	# ifdef TIOCNOTTY
247	pcg	1.4	fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
248			if (fd >= 0)
249			{
250			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
251			close (fd);
252	pcg	1.1	}
253			# endif
254	root	1.16
255	pcg	1.4	/* ---------------------------------------- */
256			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
257			if (fd >= 0)
258			close (fd); /* ouch: still have controlling tty */
259	root	1.16
260	pcg	1.4	/* ---------------------------------------- */
261	pcg	1.1	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
262	pcg	1.4	/*
263			* Push STREAMS modules:
264			* ptem: pseudo-terminal hardware emulation module.
265			* ldterm: standard terminal line discipline.
266			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
267			*
268	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
269	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
270			* should make the "ptem" (or "ldterm" depending upon either which OS
271			* version or which set of manual pages you have) module give us a
272	pcg	1.6	* controlling terminal. We must already have close ()d the master side
273	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
274	pcg	1.6	* documentation is really unclear about whether it is any close () on
275			* the master side or the last close () - i.e. a proper STREAMS dismantling
276			* close () - on the master side which causes a hang up to be sent
277	pcg	1.4	* through - Geoff Wing
278			*/
279	pcg	1.1	# ifdef HAVE_ISASTREAM
280	pcg	1.4	if (isastream (fd_tty) == 1)
281	pcg	1.1	# endif
282			{
283	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
284			ioctl (fd_tty, I_PUSH, "ldterm");
285			ioctl (fd_tty, I_PUSH, "ttcompat");
286	pcg	1.1	}
287			#endif
288	pcg	1.4	/* ---------------------------------------- */
289	pcg	1.1	# if defined(TIOCSCTTY)
290	pcg	1.4	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
291	pcg	1.1	# elif defined(TIOCSETCTTY)
292	pcg	1.4	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
293	pcg	1.1	# else
294	pcg	1.4	fd = open (ttydev, O_RDWR);
295			if (fd >= 0)
296	pcg	1.6	close (fd);
297	pcg	1.1	# endif
298	pcg	1.4	/* ---------------------------------------- */
299			fd = open ("/dev/tty", O_WRONLY);
300			if (fd < 0)
301			return -1; /* fatal */
302			close (fd);
303			/* ---------------------------------------- */
304	pcg	1.1	#endif /* ! __QNX__ */
305	pcg	1.4
306			return 0;
307	pcg	1.1	}
308	root	1.16
309			#ifndef NO_SETOWNER_TTYDEV
310			static struct ttyconf {
311			gid_t gid;
312			mode_t mode;
313
314			ttyconf ()
315			{
316			#ifdef TTY_GID_SUPPORT
317			struct group *gr = getgrnam ("tty");
318
319			if (gr)
320			{ /* change group ownership of tty to "tty" */
321			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
322			gid = gr->gr_gid;
323			}
324			else
325			#endif /* TTY_GID_SUPPORT */
326			{
327			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
328			gid = getgid ();
329			}
330			}
331			} ttyconf;
332
333			void
334			rxvt_ptytty::privileges (rxvt_privaction action)
335			{
336	root	1.26	if (!name \|\| !*name)
337	root	1.23	return;
338
339	root	1.16	rxvt_privileges (RESTORE);
340
341			if (action == SAVE)
342			{
343			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
344			/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
345			if (lstat (name, &savestat) < 0) /* you lose out */
346	root	1.26	;
347	root	1.16	else
348			# endif
349			{
350	root	1.26	saved = true;
351	root	1.16	chown (name, getuid (), ttyconf.gid); /* fail silently */
352			chmod (name, ttyconf.mode);
353			# ifdef HAVE_REVOKE
354			revoke (name);
355			# endif
356			}
357			}
358			else
359			{ /* action == RESTORE */
360			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
361	root	1.26	if (saved)
362			{
363			chmod (name, savestat.st_mode);
364			chown (name, savestat.st_uid, savestat.st_gid);
365			}
366	root	1.16	# else
367			chmod (name, (S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH));
368			chown (name, 0, 0);
369			# endif
370
371			}
372
373			rxvt_privileges (IGNORE);
374			}
375			#endif
376
377			rxvt_ptytty::rxvt_ptytty ()
378			{
379			pty = tty = -1;
380			name = 0;
381	root	1.26	#ifndef NO_SETOWNER_TTYDEV
382			saved = false;
383			#endif
384	root	1.16	}
385
386			rxvt_ptytty::~rxvt_ptytty ()
387			{
388			put ();
389			}
390
391			void
392
393			rxvt_ptytty::close_tty ()
394			{
395	root	1.29	if (tty < 0)
396			return;
397
398			close (tty);
399	root	1.16	tty = -1;
400			}
401
402			void
403			rxvt_ptytty::put ()
404			{
405			#ifndef NO_SETOWNER_TTYDEV
406	root	1.28	privileges (RESTORE);
407	root	1.16	#endif
408
409			if (pty >= 0) close (pty);
410			close_tty ();
411			free (name);
412
413			pty = tty = -1;
414			name = 0;
415			}
416
417			bool
418			rxvt_ptytty::make_controlling_tty ()
419			{
420			return control_tty (tty, name) >= 0;
421			}
422
423			bool
424			rxvt_ptytty::get ()
425			{
426			/* get master (pty) */
427			if ((pty = get_pty (&tty, &name)) < 0)
428			return false;
429
430			fcntl (pty, F_SETFL, O_NONBLOCK);
431
432			/* get slave (tty) */
433			if (tty < 0)
434			{
435			#ifndef NO_SETOWNER_TTYDEV
436			privileges (SAVE);
437			#endif
438
439			if ((tty = get_tty (name)) < 0)
440			{
441			put ();
442			return false;
443			}
444			}
445
446			return true;
447			}
448
449	root	1.22	void
450			rxvt_ptytty::set_utf8_mode (bool on)
451			{
452			#ifdef IUTF8
453	root	1.29	if (pty < 0)
454			return;
455
456			struct termios tio;
457
458			if (tcgetattr (pty, &tio) != -1)
459	root	1.22	{
460	root	1.29	tcflag_t new_cflag = tio.c_iflag;
461
462			if (on)
463			new_cflag \|= IUTF8;
464			else
465			new_cflag &= ~IUTF8;
466	root	1.22
467	root	1.29	if (new_cflag != tio.c_iflag)
468	root	1.22	{
469	root	1.29	tio.c_iflag = new_cflag;
470			tcsetattr (pty, TCSANOW, &tio);
471	root	1.22	}
472			}
473			#endif
474			}
475
476	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
477	root	1.16