rxvt-unicode/src/ptytty.C

/*--------------------------------*-C-*---------------------------------*
 * File:        ptytty.c
 *----------------------------------------------------------------------*
 * $Id: ptytty.C,v 1.3 2003/11/25 15:25:17 pcg Exp $
 *
 * 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
 */

#include <stdio.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#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 <string.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(__CYGWIN32__)
# include <sys/stropts.h>      /* for I_PUSH */
#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:	1.4
Committed:	Tue Dec 2 21:49:46 2003 UTC (20 years, 5 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1-2, rel-1-3
Changes since 1.3:	+163 -141 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/---------------------------------C----------------------------------
2			* File: ptytty.c
3			----------------------------------------------------------------------
4	pcg	1.4	* $Id: ptytty.C,v 1.3 2003/11/25 15:25:17 pcg Exp $
5	pcg	1.1	*
6			* All portions of code are copyright by their respective author/s.
7			* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
8			*
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
26			/*
27			* Try to be self-contained except for the above autoconfig'd defines
28			*/
29
30			#include <stdio.h>
31			#ifdef HAVE_STDLIB_H
32			# include <stdlib.h>
33			#endif
34			#ifdef HAVE_SYS_TYPES_H
35			# include <sys/types.h>
36			#endif
37			#ifdef HAVE_UNISTD_H
38			# include <unistd.h>
39			#endif
40			#if defined(HAVE_STRING_H)
41			# include <string.h>
42			#endif
43			#ifdef HAVE_FCNTL_H
44			# include <fcntl.h>
45			#endif
46			#ifdef HAVE_SYS_IOCTL_H
47			# include <sys/ioctl.h>
48			#endif
49			#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__)
50			# include <sys/stropts.h> /* for I_PUSH */
51			#endif
52
53			#ifdef DEBUG_TTY
54			# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
55			#else
56			# define D_TTY(x)
57			#endif
58
59			/* ------------------------------------------------------------------------- *
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			/* EXTPROTO */
68			int
69			rxvt_get_pty(int fd_tty, const char *ttydev)
70			{
71	pcg	1.4	int pfd;
72	pcg	1.1
73			#ifdef PTYS_ARE_OPENPTY
74
75	pcg	1.4	char tty_name[sizeof "/dev/pts/????\0"];
76
77			if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1)
78			{
79			*ttydev = strdup(tty_name);
80			return pfd;
81	pcg	1.1	}
82			#endif
83
84			#ifdef PTYS_ARE__GETPTY
85	pcg	1.4	*ttydev = _getpty(&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
86			if (*ttydev != NULL)
87			return pfd;
88	pcg	1.1	#endif
89
90			#ifdef PTYS_ARE_GETPTY
91
92	pcg	1.4	char *ptydev;
93
94			while ((ptydev = getpty()) != NULL)
95			if ((pfd = open(ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0)
96			{
97			*ttydev = ptydev;
98			return pfd;
99			}
100	pcg	1.1	#endif
101
102			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
103			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
104	pcg	1.4
105			{
106	pcg	1.1	# ifdef PTYS_ARE_GETPT
107	pcg	1.4	pfd = getpt();
108	pcg	1.1	# else
109	pcg	1.4
110			pfd = open("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
111	pcg	1.1	# endif
112	pcg	1.4
113			if (pfd >= 0)
114			{
115			if (grantpt(pfd) == 0 /* change slave permissions */
116			&& unlockpt(pfd) == 0)
117			{ /* slave now unlocked */
118			ttydev = ptsname(pfd); / get slave's name */
119			return pfd;
120			}
121			close(pfd);
122			}
123			}
124	pcg	1.1	# endif
125			#endif
126
127			#ifdef PTYS_ARE_PTC
128	pcg	1.4	if ((pfd = open("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
129			{
130			*ttydev = ttyname(pfd);
131			return pfd;
132	pcg	1.1	}
133			#endif
134
135			#ifdef PTYS_ARE_CLONE
136	pcg	1.4	if ((pfd = open("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
137			{
138			*ttydev = ptsname(pfd);
139			return pfd;
140	pcg	1.1	}
141			#endif
142
143			#ifdef PTYS_ARE_NUMERIC
144	pcg	1.4	{
145			int idx;
146			char c1, c2;
147			char pty_name[] = "/dev/ptyp???";
148			char tty_name[] = "/dev/ttyp???";
149
150			c1 = &(pty_name[sizeof(pty_name) - 4]);
151			c2 = &(tty_name[sizeof(tty_name) - 4]);
152			for (idx = 0; idx < 256; idx++)
153			{
154			sprintf(c1, "%d", idx);
155			sprintf(c2, "%d", idx);
156			if (access(tty_name, F_OK) < 0)
157			{
158			idx = 256;
159			break;
160			}
161			if ((pfd = open(pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
162			{
163			if (access(tty_name, R_OK \| W_OK) == 0)
164			{
165			*ttydev = strdup(tty_name);
166			return pfd;
167			}
168			close(pfd);
169			}
170			}
171			}
172	pcg	1.1	#endif
173			#ifdef PTYS_ARE_SEARCHED
174	pcg	1.4	{
175			const char c1, c2;
176			char pty_name[] = "/dev/pty??";
177			char tty_name[] = "/dev/tty??";
178	pcg	1.1
179			# ifndef PTYCHAR1
180			# define PTYCHAR1 "pqrstuvwxyz"
181			# endif
182			# ifndef PTYCHAR2
183			# define PTYCHAR2 "0123456789abcdef"
184			# endif
185	pcg	1.4
186			for (c1 = PTYCHAR1; *c1; c1++)
187			{
188			pty_name[(sizeof(pty_name) - 3)] =
189			tty_name[(sizeof(pty_name) - 3)] = *c1;
190			for (c2 = PTYCHAR2; *c2; c2++)
191			{
192			pty_name[(sizeof(pty_name) - 2)] =
193			tty_name[(sizeof(pty_name) - 2)] = *c2;
194			if ((pfd = open(pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
195			{
196			if (access(tty_name, R_OK \| W_OK) == 0)
197			{
198			*ttydev = strdup(tty_name);
199			return pfd;
200			}
201			close(pfd);
202			}
203			}
204			}
205			}
206	pcg	1.1	#endif
207	pcg	1.4	return -1;
208	pcg	1.1	}
209
210			/----------------------------------------------------------------------/
211			/*
212			* Returns tty file descriptor, or -1 on failure
213			*/
214			/* EXTPROTO */
215			int
216	pcg	1.4	rxvt_get_tty (const char *ttydev)
217	pcg	1.1	{
218	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
219	pcg	1.1	}
220
221			/----------------------------------------------------------------------/
222			/*
223			* Make our tty a controlling tty so that /dev/tty points to us
224			*/
225			/* EXTPROTO */
226			int
227	pcg	1.4	rxvt_control_tty (int fd_tty, const char *ttydev)
228	pcg	1.1	{
229			#ifndef __QNX__
230	pcg	1.4	int fd;
231	pcg	1.1
232	pcg	1.4	D_TTY ((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
233			/* ---------------------------------------- */
234	pcg	1.1	# ifdef HAVE_SETSID
235	pcg	1.4	setsid ();
236	pcg	1.1	# endif
237			# if defined(HAVE_SETPGID)
238	pcg	1.4	setpgid (0, 0);
239	pcg	1.1	# elif defined(HAVE_SETPGRP)
240	pcg	1.4	setpgrp (0, 0);
241	pcg	1.1	# endif
242	pcg	1.4	/* ---------------------------------------- */
243	pcg	1.1	# ifdef TIOCNOTTY
244	pcg	1.4
245			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
246			D_TTY ((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
247			if (fd >= 0)
248			{
249			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
250			close (fd);
251	pcg	1.1	}
252			# endif
253	pcg	1.4	/* ---------------------------------------- */
254			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
255			D_TTY ((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
256			if (fd >= 0)
257			close (fd); /* ouch: still have controlling tty */
258			/* ---------------------------------------- */
259	pcg	1.1	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
260	pcg	1.4	/*
261			* Push STREAMS modules:
262			* ptem: pseudo-terminal hardware emulation module.
263			* ldterm: standard terminal line discipline.
264			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
265			*
266			* After we push the STREAMS modules, the first open() on the slave side
267			* (i.e. the next section between the dashes giving us "tty opened OK")
268			* should make the "ptem" (or "ldterm" depending upon either which OS
269			* version or which set of manual pages you have) module give us a
270			* controlling terminal. We must already have close()d the master side
271			* fd in this child process before we push STREAMS modules on because the
272			* documentation is really unclear about whether it is any close() on
273			* the master side or the last close() - i.e. a proper STREAMS dismantling
274			* close() - on the master side which causes a hang up to be sent
275			* through - Geoff Wing
276			*/
277	pcg	1.1	# ifdef HAVE_ISASTREAM
278	pcg	1.4	if (isastream (fd_tty) == 1)
279	pcg	1.1	# endif
280			{
281	pcg	1.4	D_TTY ((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
282			ioctl (fd_tty, I_PUSH, "ptem");
283			ioctl (fd_tty, I_PUSH, "ldterm");
284			ioctl (fd_tty, I_PUSH, "ttcompat");
285	pcg	1.1	}
286			#endif
287	pcg	1.4	/* ---------------------------------------- */
288	pcg	1.1	# if defined(TIOCSCTTY)
289	pcg	1.4	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
290			D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
291	pcg	1.1	# elif defined(TIOCSETCTTY)
292	pcg	1.4	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
293			D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
294	pcg	1.1	# else
295	pcg	1.4	fd = open (ttydev, O_RDWR);
296			D_TTY ((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
297			if (fd >= 0)
298			close(fd);
299	pcg	1.1	# endif
300	pcg	1.4	/* ---------------------------------------- */
301			fd = open ("/dev/tty", O_WRONLY);
302			D_TTY ((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
303			if (fd < 0)
304			return -1; /* fatal */
305			close (fd);
306			/* ---------------------------------------- */
307			D_TTY ((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
308			/* ---------------------------------------- */
309	pcg	1.1	#endif /* ! __QNX__ */
310	pcg	1.4
311			return 0;
312	pcg	1.1	}
313			/----------------------- end-of-file (C source) -----------------------/