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, 3 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 *
#	Content
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	int pfd;
71
72	#ifdef PTYS_ARE_OPENPTY
73
74	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	}
81	#endif
82
83	#ifdef PTYS_ARE__GETPTY
84	*ttydev = _getpty(&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
85	if (*ttydev != NULL)
86	return pfd;
87	#endif
88
89	#ifdef PTYS_ARE_GETPTY
90
91	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	#endif
100
101	#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
102	# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
103
104	{
105	# ifdef PTYS_ARE_GETPT
106	pfd = getpt();
107	# else
108
109	pfd = open("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
110	# endif
111
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	# endif
124	#endif
125
126	#ifdef PTYS_ARE_PTC
127	if ((pfd = open("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
128	{
129	*ttydev = ttyname(pfd);
130	return pfd;
131	}
132	#endif
133
134	#ifdef PTYS_ARE_CLONE
135	if ((pfd = open("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
136	{
137	*ttydev = ptsname(pfd);
138	return pfd;
139	}
140	#endif
141
142	#ifdef PTYS_ARE_NUMERIC
143	{
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	#endif
172	#ifdef PTYS_ARE_SEARCHED
173	{
174	const char c1, c2;
175	char pty_name[] = "/dev/pty??";
176	char tty_name[] = "/dev/tty??";
177
178	# ifndef PTYCHAR1
179	# define PTYCHAR1 "pqrstuvwxyz"
180	# endif
181	# ifndef PTYCHAR2
182	# define PTYCHAR2 "0123456789abcdef"
183	# endif
184
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	#endif
206	return -1;
207	}
208
209	/----------------------------------------------------------------------/
210	/*
211	* Returns tty file descriptor, or -1 on failure
212	*/
213	/* EXTPROTO */
214	int
215	rxvt_get_tty (const char *ttydev)
216	{
217	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
218	}
219
220	/----------------------------------------------------------------------/
221	/*
222	* Make our tty a controlling tty so that /dev/tty points to us
223	*/
224	/* EXTPROTO */
225	int
226	rxvt_control_tty (int fd_tty, const char *ttydev)
227	{
228	#ifndef __QNX__
229	int fd;
230
231	D_TTY ((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
232	/* ---------------------------------------- */
233	# ifdef HAVE_SETSID
234	setsid ();
235	# endif
236	# if defined(HAVE_SETPGID)
237	setpgid (0, 0);
238	# elif defined(HAVE_SETPGRP)
239	setpgrp (0, 0);
240	# endif
241	/* ---------------------------------------- */
242	# ifdef TIOCNOTTY
243
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	}
251	# endif
252	/* ---------------------------------------- */
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	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
259	/*
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	# ifdef HAVE_ISASTREAM
277	if (isastream (fd_tty) == 1)
278	# endif
279	{
280	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	}
285	#endif
286	/* ---------------------------------------- */
287	# if defined(TIOCSCTTY)
288	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
289	D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
290	# elif defined(TIOCSETCTTY)
291	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
292	D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
293	# else
294	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	# endif
299	/* ---------------------------------------- */
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	#endif /* ! __QNX__ */
309
310	return 0;
311	}
312	/----------------------- end-of-file (C source) -----------------------/