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>
 *
 * 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 */

/*
 * Try to be self-contained except for the above autoconfig'd defines
 */

#if 0
#ifdef HAVE_GETPT
# define _GNU_SOURCE
#endif
#endif

#include <cstdio>
#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(__CYGWIN32__)
# include <sys/stropts.h>      /* for I_PUSH */
#endif
#ifdef HAVE_ISASTREAM
# include <stropts.h>
#endif

#ifdef DEBUG_TTY
# define D_TTY(x)               fprintf x ; fputc('\n', stderr) ; fflush(stderr)
#else
# define D_TTY(x)
#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
 */
/* EXTPROTO */
int
rxvt_get_pty (int *fd_tty, const 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 = 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 = ttyname (pfd);
      return pfd;
    }
#endif

#ifdef PTYS_ARE_CLONE
  if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
    {
      *ttydev = 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 
 */
/* EXTPROTO */
int
rxvt_get_tty (const char *ttydev)
{
  return open (ttydev, O_RDWR | O_NOCTTY, 0);
}

/*----------------------------------------------------------------------*/
/*
 * Make our tty a controlling tty so that /dev/tty points to us
 */
/* EXTPROTO */
int
rxvt_control_tty (int fd_tty, const char *ttydev)
{
#ifndef __QNX__
  int fd;

  D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev));
  /* ---------------------------------------- */
# 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);
  D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
  if (fd >= 0)
    {
      ioctl (fd, TIOCNOTTY, NULL);      /* void tty associations */
      close (fd);
    }
# endif
  /* ---------------------------------------- */
  fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
  D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
  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
    {
      D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules"));
      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);
  D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd));
# elif defined(TIOCSETCTTY)
  fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
  D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd));
# else
  fd = open (ttydev, O_RDWR);
  D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK"));
  if (fd >= 0)
    close (fd);
# endif
  /* ---------------------------------------- */
  fd = open ("/dev/tty", O_WRONLY);
  D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
  if (fd < 0)
    return -1;          /* fatal */
  close (fd);
  /* ---------------------------------------- */
  D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d  getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ()));
  /* ---------------------------------------- */
#endif                          /* ! __QNX__ */

  return 0;
}
/*----------------------- end-of-file (C source) -----------------------*/
Revision:	1.10
Committed:	Fri Apr 2 20:41:01 2004 UTC (20 years, 1 month ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_7
Changes since 1.8:	+3 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/---------------------------------C----------------------------------
2			* 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			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			---------------------------------------------------------------------/
22
23			#include "../config.h" /* NECESSARY */
24
25			/*
26			* Try to be self-contained except for the above autoconfig'd defines
27			*/
28
29	pcg	1.7	#if 0
30			#ifdef HAVE_GETPT
31			# define _GNU_SOURCE
32			#endif
33			#endif
34
35	pcg	1.8	#include <cstdio>
36	pcg	1.1	#ifdef HAVE_STDLIB_H
37	pcg	1.8	# include <cstdlib>
38	pcg	1.1	#endif
39			#ifdef HAVE_SYS_TYPES_H
40			# include <sys/types.h>
41			#endif
42			#ifdef HAVE_UNISTD_H
43			# include <unistd.h>
44			#endif
45			#if defined(HAVE_STRING_H)
46	pcg	1.8	# include <cstring>
47	pcg	1.1	#endif
48			#ifdef HAVE_FCNTL_H
49			# include <fcntl.h>
50			#endif
51			#ifdef HAVE_SYS_IOCTL_H
52			# include <sys/ioctl.h>
53			#endif
54			#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__)
55			# include <sys/stropts.h> /* for I_PUSH */
56			#endif
57	pcg	1.10	#ifdef HAVE_ISASTREAM
58			# include <stropts.h>
59			#endif
60	pcg	1.1
61			#ifdef DEBUG_TTY
62			# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
63			#else
64			# define D_TTY(x)
65			#endif
66
67			/* ------------------------------------------------------------------------- *
68			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
69			* ------------------------------------------------------------------------- */
70			/*
71			* Returns pty file descriptor, or -1 on failure
72			* If successful, ttydev is set to the name of the slave device.
73			* fd_tty _may_ also be set to an open fd to the slave device
74			*/
75			/* EXTPROTO */
76			int
77	pcg	1.6	rxvt_get_pty (int fd_tty, const char *ttydev)
78	pcg	1.1	{
79	pcg	1.4	int pfd;
80	pcg	1.1
81			#ifdef PTYS_ARE_OPENPTY
82
83	pcg	1.4	char tty_name[sizeof "/dev/pts/????\0"];
84
85	pcg	1.6	if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1)
86	pcg	1.4	{
87	pcg	1.6	*ttydev = strdup (tty_name);
88	pcg	1.4	return pfd;
89	pcg	1.1	}
90			#endif
91
92			#ifdef PTYS_ARE__GETPTY
93	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
94	pcg	1.4	if (*ttydev != NULL)
95			return pfd;
96	pcg	1.1	#endif
97
98			#ifdef PTYS_ARE_GETPTY
99
100	pcg	1.4	char *ptydev;
101
102	pcg	1.6	while ((ptydev = getpty ()) != NULL)
103			if ((pfd = open (ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0)
104	pcg	1.4	{
105			*ttydev = ptydev;
106			return pfd;
107			}
108	pcg	1.1	#endif
109
110			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
111			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
112	pcg	1.4
113			{
114	pcg	1.1	# ifdef PTYS_ARE_GETPT
115	pcg	1.6	pfd = getpt ();
116	pcg	1.1	# else
117	pcg	1.4
118	pcg	1.6	pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
119	pcg	1.1	# endif
120	pcg	1.4
121			if (pfd >= 0)
122			{
123	pcg	1.6	if (grantpt (pfd) == 0 /* change slave permissions */
124			&& unlockpt (pfd) == 0)
125	pcg	1.4	{ /* slave now unlocked */
126	pcg	1.6	ttydev = ptsname (pfd); / get slave's name */
127	pcg	1.4	return pfd;
128			}
129	pcg	1.6	close (pfd);
130	pcg	1.4	}
131			}
132	pcg	1.1	# endif
133			#endif
134
135			#ifdef PTYS_ARE_PTC
136	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
137	pcg	1.4	{
138	pcg	1.6	*ttydev = ttyname (pfd);
139	pcg	1.4	return pfd;
140	pcg	1.1	}
141			#endif
142
143			#ifdef PTYS_ARE_CLONE
144	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
145	pcg	1.4	{
146	pcg	1.6	*ttydev = ptsname (pfd);
147	pcg	1.4	return pfd;
148	pcg	1.1	}
149			#endif
150
151			#ifdef PTYS_ARE_NUMERIC
152	pcg	1.4	{
153			int idx;
154			char c1, c2;
155			char pty_name[] = "/dev/ptyp???";
156			char tty_name[] = "/dev/ttyp???";
157
158	pcg	1.6	c1 = & (pty_name[sizeof (pty_name) - 4]);
159			c2 = & (tty_name[sizeof (tty_name) - 4]);
160	pcg	1.4	for (idx = 0; idx < 256; idx++)
161			{
162	pcg	1.6	sprintf (c1, "%d", idx);
163			sprintf (c2, "%d", idx);
164			if (access (tty_name, F_OK) < 0)
165	pcg	1.4	{
166			idx = 256;
167			break;
168			}
169	pcg	1.6	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
170	pcg	1.4	{
171	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
172	pcg	1.4	{
173	pcg	1.6	*ttydev = strdup (tty_name);
174	pcg	1.4	return pfd;
175			}
176	pcg	1.6	close (pfd);
177	pcg	1.4	}
178			}
179			}
180	pcg	1.1	#endif
181			#ifdef PTYS_ARE_SEARCHED
182	pcg	1.4	{
183			const char c1, c2;
184			char pty_name[] = "/dev/pty??";
185			char tty_name[] = "/dev/tty??";
186	pcg	1.1
187			# ifndef PTYCHAR1
188			# define PTYCHAR1 "pqrstuvwxyz"
189			# endif
190			# ifndef PTYCHAR2
191			# define PTYCHAR2 "0123456789abcdef"
192			# endif
193	pcg	1.4
194			for (c1 = PTYCHAR1; *c1; c1++)
195			{
196	pcg	1.6	pty_name[ (sizeof (pty_name) - 3)] =
197			tty_name[ (sizeof (pty_name) - 3)] = *c1;
198	pcg	1.4	for (c2 = PTYCHAR2; *c2; c2++)
199			{
200	pcg	1.6	pty_name[ (sizeof (pty_name) - 2)] =
201			tty_name[ (sizeof (pty_name) - 2)] = *c2;
202			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
203	pcg	1.4	{
204	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
205	pcg	1.4	{
206	pcg	1.6	*ttydev = strdup (tty_name);
207	pcg	1.4	return pfd;
208			}
209	pcg	1.6	close (pfd);
210	pcg	1.4	}
211			}
212			}
213			}
214	pcg	1.1	#endif
215	pcg	1.4	return -1;
216	pcg	1.1	}
217
218			/----------------------------------------------------------------------/
219			/*
220			* Returns tty file descriptor, or -1 on failure
221			*/
222			/* EXTPROTO */
223			int
224	pcg	1.4	rxvt_get_tty (const char *ttydev)
225	pcg	1.1	{
226	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
227	pcg	1.1	}
228
229			/----------------------------------------------------------------------/
230			/*
231			* Make our tty a controlling tty so that /dev/tty points to us
232			*/
233			/* EXTPROTO */
234			int
235	pcg	1.4	rxvt_control_tty (int fd_tty, const char *ttydev)
236	pcg	1.1	{
237			#ifndef __QNX__
238	pcg	1.4	int fd;
239	pcg	1.1
240	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev));
241	pcg	1.4	/* ---------------------------------------- */
242	pcg	1.1	# ifdef HAVE_SETSID
243	pcg	1.4	setsid ();
244	pcg	1.1	# endif
245			# if defined(HAVE_SETPGID)
246	pcg	1.4	setpgid (0, 0);
247	pcg	1.1	# elif defined(HAVE_SETPGRP)
248	pcg	1.4	setpgrp (0, 0);
249	pcg	1.1	# endif
250	pcg	1.4	/* ---------------------------------------- */
251	pcg	1.1	# ifdef TIOCNOTTY
252	pcg	1.4
253			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
254	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
255	pcg	1.4	if (fd >= 0)
256			{
257			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
258			close (fd);
259	pcg	1.1	}
260			# endif
261	pcg	1.4	/* ---------------------------------------- */
262			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
263	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
264	pcg	1.4	if (fd >= 0)
265			close (fd); /* ouch: still have controlling tty */
266			/* ---------------------------------------- */
267	pcg	1.1	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
268	pcg	1.4	/*
269			* Push STREAMS modules:
270			* ptem: pseudo-terminal hardware emulation module.
271			* ldterm: standard terminal line discipline.
272			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
273			*
274	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
275	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
276			* should make the "ptem" (or "ldterm" depending upon either which OS
277			* version or which set of manual pages you have) module give us a
278	pcg	1.6	* controlling terminal. We must already have close ()d the master side
279	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
280	pcg	1.6	* documentation is really unclear about whether it is any close () on
281			* the master side or the last close () - i.e. a proper STREAMS dismantling
282			* close () - on the master side which causes a hang up to be sent
283	pcg	1.4	* through - Geoff Wing
284			*/
285	pcg	1.1	# ifdef HAVE_ISASTREAM
286	pcg	1.4	if (isastream (fd_tty) == 1)
287	pcg	1.1	# endif
288			{
289	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules"));
290	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
291			ioctl (fd_tty, I_PUSH, "ldterm");
292			ioctl (fd_tty, I_PUSH, "ttcompat");
293	pcg	1.1	}
294			#endif
295	pcg	1.4	/* ---------------------------------------- */
296	pcg	1.1	# if defined(TIOCSCTTY)
297	pcg	1.4	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
298	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd));
299	pcg	1.1	# elif defined(TIOCSETCTTY)
300	pcg	1.4	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
301	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd));
302	pcg	1.1	# else
303	pcg	1.4	fd = open (ttydev, O_RDWR);
304	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK"));
305	pcg	1.4	if (fd >= 0)
306	pcg	1.6	close (fd);
307	pcg	1.1	# endif
308	pcg	1.4	/* ---------------------------------------- */
309			fd = open ("/dev/tty", O_WRONLY);
310	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
311	pcg	1.4	if (fd < 0)
312			return -1; /* fatal */
313			close (fd);
314			/* ---------------------------------------- */
315	pcg	1.6	D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ()));
316	pcg	1.4	/* ---------------------------------------- */
317	pcg	1.1	#endif /* ! __QNX__ */
318	pcg	1.4
319			return 0;
320	pcg	1.1	}
321			/----------------------- end-of-file (C source) -----------------------/