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      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"

#ifdef HAVE_STDLIB_H
# include <cstdlib>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined(HAVE_STRING_H)
# include <cstring>
#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
#ifdef HAVE_PTY_H
# include <pty.h>
#endif

// better do this via configure, but....
#if defined(__FreeBSD__)
# include <libutil.h>
#elif defined(__DARWIN__) || (defined (__MACH__) && defined (__APPLE__))
# 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"];

  if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -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) close (tty);
  tty = -1;
}

void
rxvt_ptytty::put ()
{
#ifndef NO_SETOWNER_TTYDEV
  if (tty >= 0)
    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 != -1)
    {
      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:	1.26
Committed:	Mon Jan 2 15:10:18 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-6_2
Changes since 1.25:	+13 -13 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	pcg	1.11	* Copyright (c) 2004 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			#ifdef HAVE_STDLIB_H
28	pcg	1.8	# include <cstdlib>
29	pcg	1.1	#endif
30			#ifdef HAVE_SYS_TYPES_H
31			# include <sys/types.h>
32			#endif
33			#ifdef HAVE_UNISTD_H
34			# include <unistd.h>
35			#endif
36			#if defined(HAVE_STRING_H)
37	pcg	1.8	# include <cstring>
38	pcg	1.1	#endif
39			#ifdef HAVE_FCNTL_H
40			# include <fcntl.h>
41			#endif
42			#ifdef HAVE_SYS_IOCTL_H
43			# include <sys/ioctl.h>
44			#endif
45	root	1.12	#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
46	pcg	1.1	# include <sys/stropts.h> /* for I_PUSH */
47			#endif
48	pcg	1.10	#ifdef HAVE_ISASTREAM
49			# include <stropts.h>
50			#endif
51	root	1.22	#ifdef HAVE_PTY_H
52			# include <pty.h>
53			#endif
54	pcg	1.1
55	root	1.16	// better do this via configure, but....
56	root	1.17	#if defined(__FreeBSD__)
57	root	1.16	# include <libutil.h>
58	root	1.18	#elif defined(__DARWIN__) \|\| (defined (__MACH__) && defined (__APPLE__))
59	root	1.17	# include <util.h>
60	pcg	1.1	#endif
61
62	root	1.16	#include <cstdio>
63			#include <grp.h>
64
65	pcg	1.1	/* ------------------------------------------------------------------------- *
66			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
67			* ------------------------------------------------------------------------- */
68			/*
69			* Returns pty file descriptor, or -1 on failure
70			* If successful, ttydev is set to the name of the slave device.
71			* fd_tty _may_ also be set to an open fd to the slave device
72			*/
73	root	1.16	static int
74			get_pty (int fd_tty, char *ttydev)
75	pcg	1.1	{
76	pcg	1.4	int pfd;
77	pcg	1.1
78			#ifdef PTYS_ARE_OPENPTY
79	root	1.26	char tty_name[sizeof "/dev/pts/????\0"];
80	pcg	1.4
81	root	1.26	if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1)
82	pcg	1.4	{
83	pcg	1.6	*ttydev = strdup (tty_name);
84	pcg	1.4	return pfd;
85	pcg	1.1	}
86			#endif
87
88			#ifdef PTYS_ARE__GETPTY
89	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
90	pcg	1.4	if (*ttydev != NULL)
91			return pfd;
92	pcg	1.1	#endif
93
94			#ifdef PTYS_ARE_GETPTY
95	pcg	1.4	char *ptydev;
96
97	pcg	1.6	while ((ptydev = getpty ()) != NULL)
98			if ((pfd = open (ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0)
99	pcg	1.4	{
100			*ttydev = ptydev;
101			return pfd;
102			}
103	pcg	1.1	#endif
104
105			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
106			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
107	pcg	1.4
108			{
109	pcg	1.1	# ifdef PTYS_ARE_GETPT
110	pcg	1.6	pfd = getpt ();
111	pcg	1.1	# else
112	pcg	1.6	pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
113	pcg	1.1	# endif
114	pcg	1.4
115			if (pfd >= 0)
116			{
117	pcg	1.6	if (grantpt (pfd) == 0 /* change slave permissions */
118			&& unlockpt (pfd) == 0)
119	pcg	1.4	{ /* slave now unlocked */
120	root	1.16	ttydev = strdup (ptsname (pfd)); / get slave's name */
121	pcg	1.4	return pfd;
122			}
123	pcg	1.6	close (pfd);
124	pcg	1.4	}
125			}
126	pcg	1.1	# endif
127			#endif
128
129			#ifdef PTYS_ARE_PTC
130	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
131	pcg	1.4	{
132	root	1.16	*ttydev = strdup (ttyname (pfd));
133	pcg	1.4	return pfd;
134	pcg	1.1	}
135			#endif
136
137			#ifdef PTYS_ARE_CLONE
138	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
139	pcg	1.4	{
140	root	1.16	*ttydev = strdup (ptsname (pfd));
141	pcg	1.4	return pfd;
142	pcg	1.1	}
143			#endif
144
145			#ifdef PTYS_ARE_NUMERIC
146	pcg	1.4	{
147	root	1.16	int idx;
148			char c1, c2;
149			char pty_name[] = "/dev/ptyp???";
150			char tty_name[] = "/dev/ttyp???";
151	pcg	1.4
152	root	1.16	c1 = &(pty_name[sizeof (pty_name) - 4]);
153			c2 = &(tty_name[sizeof (tty_name) - 4]);
154	pcg	1.4	for (idx = 0; idx < 256; idx++)
155			{
156	pcg	1.6	sprintf (c1, "%d", idx);
157			sprintf (c2, "%d", idx);
158			if (access (tty_name, F_OK) < 0)
159	pcg	1.4	{
160			idx = 256;
161			break;
162			}
163	root	1.16
164	pcg	1.6	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
165	pcg	1.4	{
166	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
167	pcg	1.4	{
168	pcg	1.6	*ttydev = strdup (tty_name);
169	pcg	1.4	return pfd;
170			}
171	root	1.16
172	pcg	1.6	close (pfd);
173	pcg	1.4	}
174			}
175			}
176	pcg	1.1	#endif
177	root	1.16
178	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
179	pcg	1.4	{
180	root	1.16	const char c1, c2;
181			char pty_name[] = "/dev/pty??";
182			char tty_name[] = "/dev/tty??";
183	pcg	1.1
184			# ifndef PTYCHAR1
185			# define PTYCHAR1 "pqrstuvwxyz"
186			# endif
187			# ifndef PTYCHAR2
188			# define PTYCHAR2 "0123456789abcdef"
189			# endif
190	pcg	1.4
191			for (c1 = PTYCHAR1; *c1; c1++)
192			{
193	pcg	1.6	pty_name[ (sizeof (pty_name) - 3)] =
194			tty_name[ (sizeof (pty_name) - 3)] = *c1;
195	pcg	1.4	for (c2 = PTYCHAR2; *c2; c2++)
196			{
197	pcg	1.6	pty_name[ (sizeof (pty_name) - 2)] =
198			tty_name[ (sizeof (pty_name) - 2)] = *c2;
199			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
200	pcg	1.4	{
201	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
202	pcg	1.4	{
203	pcg	1.6	*ttydev = strdup (tty_name);
204	pcg	1.4	return pfd;
205			}
206	root	1.16
207	pcg	1.6	close (pfd);
208	pcg	1.4	}
209			}
210			}
211			}
212	pcg	1.1	#endif
213	root	1.16
214	pcg	1.4	return -1;
215	pcg	1.1	}
216
217			/----------------------------------------------------------------------/
218			/*
219			* Returns tty file descriptor, or -1 on failure
220			*/
221	root	1.16	static int
222			get_tty (char *ttydev)
223	pcg	1.1	{
224	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
225	pcg	1.1	}
226
227			/----------------------------------------------------------------------/
228			/*
229			* Make our tty a controlling tty so that /dev/tty points to us
230			*/
231	root	1.16	static int
232			control_tty (int fd_tty, const char *ttydev)
233	pcg	1.1	{
234			#ifndef __QNX__
235	pcg	1.4	int fd;
236	pcg	1.1
237	pcg	1.4	/* ---------------------------------------- */
238	pcg	1.1	# ifdef HAVE_SETSID
239	pcg	1.4	setsid ();
240	pcg	1.1	# endif
241			# if defined(HAVE_SETPGID)
242	pcg	1.4	setpgid (0, 0);
243	pcg	1.1	# elif defined(HAVE_SETPGRP)
244	pcg	1.4	setpgrp (0, 0);
245	pcg	1.1	# endif
246	root	1.16
247	pcg	1.4	/* ---------------------------------------- */
248	pcg	1.1	# ifdef TIOCNOTTY
249	pcg	1.4	fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
250			if (fd >= 0)
251			{
252			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
253			close (fd);
254	pcg	1.1	}
255			# endif
256	root	1.16
257	pcg	1.4	/* ---------------------------------------- */
258			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
259			if (fd >= 0)
260			close (fd); /* ouch: still have controlling tty */
261	root	1.16
262	pcg	1.4	/* ---------------------------------------- */
263	pcg	1.1	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
264	pcg	1.4	/*
265			* Push STREAMS modules:
266			* ptem: pseudo-terminal hardware emulation module.
267			* ldterm: standard terminal line discipline.
268			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
269			*
270	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
271	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
272			* should make the "ptem" (or "ldterm" depending upon either which OS
273			* version or which set of manual pages you have) module give us a
274	pcg	1.6	* controlling terminal. We must already have close ()d the master side
275	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
276	pcg	1.6	* documentation is really unclear about whether it is any close () on
277			* the master side or the last close () - i.e. a proper STREAMS dismantling
278			* close () - on the master side which causes a hang up to be sent
279	pcg	1.4	* through - Geoff Wing
280			*/
281	pcg	1.1	# ifdef HAVE_ISASTREAM
282	pcg	1.4	if (isastream (fd_tty) == 1)
283	pcg	1.1	# endif
284			{
285	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
286			ioctl (fd_tty, I_PUSH, "ldterm");
287			ioctl (fd_tty, I_PUSH, "ttcompat");
288	pcg	1.1	}
289			#endif
290	pcg	1.4	/* ---------------------------------------- */
291	pcg	1.1	# if defined(TIOCSCTTY)
292	pcg	1.4	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
293	pcg	1.1	# elif defined(TIOCSETCTTY)
294	pcg	1.4	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
295	pcg	1.1	# else
296	pcg	1.4	fd = open (ttydev, O_RDWR);
297			if (fd >= 0)
298	pcg	1.6	close (fd);
299	pcg	1.1	# endif
300	pcg	1.4	/* ---------------------------------------- */
301			fd = open ("/dev/tty", O_WRONLY);
302			if (fd < 0)
303			return -1; /* fatal */
304			close (fd);
305			/* ---------------------------------------- */
306	pcg	1.1	#endif /* ! __QNX__ */
307	pcg	1.4
308			return 0;
309	pcg	1.1	}
310	root	1.16
311			#ifndef NO_SETOWNER_TTYDEV
312			static struct ttyconf {
313			gid_t gid;
314			mode_t mode;
315
316			ttyconf ()
317			{
318			#ifdef TTY_GID_SUPPORT
319			struct group *gr = getgrnam ("tty");
320
321			if (gr)
322			{ /* change group ownership of tty to "tty" */
323			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
324			gid = gr->gr_gid;
325			}
326			else
327			#endif /* TTY_GID_SUPPORT */
328			{
329			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
330			gid = getgid ();
331			}
332			}
333			} ttyconf;
334
335			void
336			rxvt_ptytty::privileges (rxvt_privaction action)
337			{
338	root	1.26	if (!name \|\| !*name)
339	root	1.23	return;
340
341	root	1.16	rxvt_privileges (RESTORE);
342
343			if (action == SAVE)
344			{
345			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
346			/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
347			if (lstat (name, &savestat) < 0) /* you lose out */
348	root	1.26	;
349	root	1.16	else
350			# endif
351			{
352	root	1.26	saved = true;
353	root	1.16	chown (name, getuid (), ttyconf.gid); /* fail silently */
354			chmod (name, ttyconf.mode);
355			# ifdef HAVE_REVOKE
356			revoke (name);
357			# endif
358			}
359			}
360			else
361			{ /* action == RESTORE */
362			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
363	root	1.26	if (saved)
364			{
365			chmod (name, savestat.st_mode);
366			chown (name, savestat.st_uid, savestat.st_gid);
367			}
368	root	1.16	# else
369			chmod (name, (S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH));
370			chown (name, 0, 0);
371			# endif
372
373			}
374
375			rxvt_privileges (IGNORE);
376			}
377			#endif
378
379			rxvt_ptytty::rxvt_ptytty ()
380			{
381			pty = tty = -1;
382			name = 0;
383	root	1.26	#ifndef NO_SETOWNER_TTYDEV
384			saved = false;
385			#endif
386	root	1.16	}
387
388			rxvt_ptytty::~rxvt_ptytty ()
389			{
390			put ();
391			}
392
393			void
394
395			rxvt_ptytty::close_tty ()
396			{
397			if (tty >= 0) close (tty);
398			tty = -1;
399			}
400
401			void
402			rxvt_ptytty::put ()
403			{
404			#ifndef NO_SETOWNER_TTYDEV
405			if (tty >= 0)
406			privileges (RESTORE);
407			#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			if (pty != -1)
454			{
455			struct termios tio;
456
457			if (tcgetattr (pty, &tio) != -1)
458			{
459			tcflag_t new_cflag = tio.c_iflag;
460
461			if (on)
462			new_cflag \|= IUTF8;
463			else
464			new_cflag &= ~IUTF8;
465
466			if (new_cflag != tio.c_iflag)
467			{
468			tio.c_iflag = new_cflag;
469			tcsetattr (pty, TCSANOW, &tio);
470			}
471			}
472			}
473			#endif
474			}
475
476	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
477	root	1.16