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
 */

#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:	1.5
Committed:	Sat Jan 31 03:27:45 2004 UTC (20 years, 4 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	before_astyle, after_astyle
Changes since 1.4:	+0 -1 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			#include <stdio.h>
30			#ifdef HAVE_STDLIB_H
31			# include <stdlib.h>
32			#endif
33			#ifdef HAVE_SYS_TYPES_H
34			# include <sys/types.h>
35			#endif
36			#ifdef HAVE_UNISTD_H
37			# include <unistd.h>
38			#endif
39			#if defined(HAVE_STRING_H)
40			# include <string.h>
41			#endif
42			#ifdef HAVE_FCNTL_H
43			# include <fcntl.h>
44			#endif
45			#ifdef HAVE_SYS_IOCTL_H
46			# include <sys/ioctl.h>
47			#endif
48			#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__)
49			# include <sys/stropts.h> /* for I_PUSH */
50			#endif
51
52			#ifdef DEBUG_TTY
53			# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
54			#else
55			# define D_TTY(x)
56			#endif
57
58			/* ------------------------------------------------------------------------- *
59			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
60			* ------------------------------------------------------------------------- */
61			/*
62			* Returns pty file descriptor, or -1 on failure
63			* If successful, ttydev is set to the name of the slave device.
64			* fd_tty _may_ also be set to an open fd to the slave device
65			*/
66			/* EXTPROTO */
67			int
68			rxvt_get_pty(int fd_tty, const char *ttydev)
69			{
70	pcg	1.4	int pfd;
71	pcg	1.1
72			#ifdef PTYS_ARE_OPENPTY
73
74	pcg	1.4	char tty_name[sizeof "/dev/pts/????\0"];
75
76			if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1)
77			{
78			*ttydev = strdup(tty_name);
79			return pfd;
80	pcg	1.1	}
81			#endif
82
83			#ifdef PTYS_ARE__GETPTY
84	pcg	1.4	*ttydev = _getpty(&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
85			if (*ttydev != NULL)
86			return pfd;
87	pcg	1.1	#endif
88
89			#ifdef PTYS_ARE_GETPTY
90
91	pcg	1.4	char *ptydev;
92
93			while ((ptydev = getpty()) != NULL)
94			if ((pfd = open(ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0)
95			{
96			*ttydev = ptydev;
97			return pfd;
98			}
99	pcg	1.1	#endif
100
101			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
102			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
103	pcg	1.4
104			{
105	pcg	1.1	# ifdef PTYS_ARE_GETPT
106	pcg	1.4	pfd = getpt();
107	pcg	1.1	# else
108	pcg	1.4
109			pfd = open("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
110	pcg	1.1	# endif
111	pcg	1.4
112			if (pfd >= 0)
113			{
114			if (grantpt(pfd) == 0 /* change slave permissions */
115			&& unlockpt(pfd) == 0)
116			{ /* slave now unlocked */
117			ttydev = ptsname(pfd); / get slave's name */
118			return pfd;
119			}
120			close(pfd);
121			}
122			}
123	pcg	1.1	# endif
124			#endif
125
126			#ifdef PTYS_ARE_PTC
127	pcg	1.4	if ((pfd = open("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
128			{
129			*ttydev = ttyname(pfd);
130			return pfd;
131	pcg	1.1	}
132			#endif
133
134			#ifdef PTYS_ARE_CLONE
135	pcg	1.4	if ((pfd = open("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
136			{
137			*ttydev = ptsname(pfd);
138			return pfd;
139	pcg	1.1	}
140			#endif
141
142			#ifdef PTYS_ARE_NUMERIC
143	pcg	1.4	{
144			int idx;
145			char c1, c2;
146			char pty_name[] = "/dev/ptyp???";
147			char tty_name[] = "/dev/ttyp???";
148
149			c1 = &(pty_name[sizeof(pty_name) - 4]);
150			c2 = &(tty_name[sizeof(tty_name) - 4]);
151			for (idx = 0; idx < 256; idx++)
152			{
153			sprintf(c1, "%d", idx);
154			sprintf(c2, "%d", idx);
155			if (access(tty_name, F_OK) < 0)
156			{
157			idx = 256;
158			break;
159			}
160			if ((pfd = open(pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
161			{
162			if (access(tty_name, R_OK \| W_OK) == 0)
163			{
164			*ttydev = strdup(tty_name);
165			return pfd;
166			}
167			close(pfd);
168			}
169			}
170			}
171	pcg	1.1	#endif
172			#ifdef PTYS_ARE_SEARCHED
173	pcg	1.4	{
174			const char c1, c2;
175			char pty_name[] = "/dev/pty??";
176			char tty_name[] = "/dev/tty??";
177	pcg	1.1
178			# ifndef PTYCHAR1
179			# define PTYCHAR1 "pqrstuvwxyz"
180			# endif
181			# ifndef PTYCHAR2
182			# define PTYCHAR2 "0123456789abcdef"
183			# endif
184	pcg	1.4
185			for (c1 = PTYCHAR1; *c1; c1++)
186			{
187			pty_name[(sizeof(pty_name) - 3)] =
188			tty_name[(sizeof(pty_name) - 3)] = *c1;
189			for (c2 = PTYCHAR2; *c2; c2++)
190			{
191			pty_name[(sizeof(pty_name) - 2)] =
192			tty_name[(sizeof(pty_name) - 2)] = *c2;
193			if ((pfd = open(pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
194			{
195			if (access(tty_name, R_OK \| W_OK) == 0)
196			{
197			*ttydev = strdup(tty_name);
198			return pfd;
199			}
200			close(pfd);
201			}
202			}
203			}
204			}
205	pcg	1.1	#endif
206	pcg	1.4	return -1;
207	pcg	1.1	}
208
209			/----------------------------------------------------------------------/
210			/*
211			* Returns tty file descriptor, or -1 on failure
212			*/
213			/* EXTPROTO */
214			int
215	pcg	1.4	rxvt_get_tty (const char *ttydev)
216	pcg	1.1	{
217	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
218	pcg	1.1	}
219
220			/----------------------------------------------------------------------/
221			/*
222			* Make our tty a controlling tty so that /dev/tty points to us
223			*/
224			/* EXTPROTO */
225			int
226	pcg	1.4	rxvt_control_tty (int fd_tty, const char *ttydev)
227	pcg	1.1	{
228			#ifndef __QNX__
229	pcg	1.4	int fd;
230	pcg	1.1
231	pcg	1.4	D_TTY ((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
232			/* ---------------------------------------- */
233	pcg	1.1	# ifdef HAVE_SETSID
234	pcg	1.4	setsid ();
235	pcg	1.1	# endif
236			# if defined(HAVE_SETPGID)
237	pcg	1.4	setpgid (0, 0);
238	pcg	1.1	# elif defined(HAVE_SETPGRP)
239	pcg	1.4	setpgrp (0, 0);
240	pcg	1.1	# endif
241	pcg	1.4	/* ---------------------------------------- */
242	pcg	1.1	# ifdef TIOCNOTTY
243	pcg	1.4
244			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
245			D_TTY ((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
246			if (fd >= 0)
247			{
248			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
249			close (fd);
250	pcg	1.1	}
251			# endif
252	pcg	1.4	/* ---------------------------------------- */
253			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
254			D_TTY ((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
255			if (fd >= 0)
256			close (fd); /* ouch: still have controlling tty */
257			/* ---------------------------------------- */
258	pcg	1.1	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
259	pcg	1.4	/*
260			* Push STREAMS modules:
261			* ptem: pseudo-terminal hardware emulation module.
262			* ldterm: standard terminal line discipline.
263			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
264			*
265			* After we push the STREAMS modules, the first open() on the slave side
266			* (i.e. the next section between the dashes giving us "tty opened OK")
267			* should make the "ptem" (or "ldterm" depending upon either which OS
268			* version or which set of manual pages you have) module give us a
269			* controlling terminal. We must already have close()d the master side
270			* fd in this child process before we push STREAMS modules on because the
271			* documentation is really unclear about whether it is any close() on
272			* the master side or the last close() - i.e. a proper STREAMS dismantling
273			* close() - on the master side which causes a hang up to be sent
274			* through - Geoff Wing
275			*/
276	pcg	1.1	# ifdef HAVE_ISASTREAM
277	pcg	1.4	if (isastream (fd_tty) == 1)
278	pcg	1.1	# endif
279			{
280	pcg	1.4	D_TTY ((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
281			ioctl (fd_tty, I_PUSH, "ptem");
282			ioctl (fd_tty, I_PUSH, "ldterm");
283			ioctl (fd_tty, I_PUSH, "ttcompat");
284	pcg	1.1	}
285			#endif
286	pcg	1.4	/* ---------------------------------------- */
287	pcg	1.1	# if defined(TIOCSCTTY)
288	pcg	1.4	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
289			D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
290	pcg	1.1	# elif defined(TIOCSETCTTY)
291	pcg	1.4	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
292			D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
293	pcg	1.1	# else
294	pcg	1.4	fd = open (ttydev, O_RDWR);
295			D_TTY ((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
296			if (fd >= 0)
297			close(fd);
298	pcg	1.1	# endif
299	pcg	1.4	/* ---------------------------------------- */
300			fd = open ("/dev/tty", O_WRONLY);
301			D_TTY ((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
302			if (fd < 0)
303			return -1; /* fatal */
304			close (fd);
305			/* ---------------------------------------- */
306			D_TTY ((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
307			/* ---------------------------------------- */
308	pcg	1.1	#endif /* ! __QNX__ */
309	pcg	1.4
310			return 0;
311	pcg	1.1	}
312			/----------------------- end-of-file (C source) -----------------------/