rxvt-unicode/src/ptytty.C

/*--------------------------------*-C-*---------------------------------*
 * File:        ptytty.c
 *----------------------------------------------------------------------*
 * $Id: ptytty.C,v 1.1 2003/11/18 14:22:18 root 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_NDELAY | 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:	1.2
Committed:	Mon Nov 24 17:31:27 2003 UTC (20 years, 6 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+0 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/---------------------------------C----------------------------------
2			* File: ptytty.c
3			----------------------------------------------------------------------
4			* $Id: ptytty.C,v 1.1 2003/11/18 14:22:18 root Exp $
5			*
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
54			#ifdef DEBUG_TTY
55			# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
56			#else
57			# define D_TTY(x)
58			#endif
59
60			/* ------------------------------------------------------------------------- *
61			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
62			* ------------------------------------------------------------------------- */
63			/*
64			* Returns pty file descriptor, or -1 on failure
65			* If successful, ttydev is set to the name of the slave device.
66			* fd_tty _may_ also be set to an open fd to the slave device
67			*/
68			/* EXTPROTO */
69			int
70			rxvt_get_pty(int fd_tty, const char *ttydev)
71			{
72			int pfd;
73
74			#ifdef PTYS_ARE_OPENPTY
75			char tty_name[sizeof "/dev/pts/????\0"];
76
77			if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) {
78			*ttydev = strdup(tty_name);
79			return pfd;
80			}
81			#endif
82
83			#ifdef PTYS_ARE__GETPTY
84			*ttydev = _getpty(&pfd, O_RDWR \| O_NDELAY \| O_NOCTTY, 0622, 0);
85			if (*ttydev != NULL)
86			return pfd;
87			#endif
88
89			#ifdef PTYS_ARE_GETPTY
90			char *ptydev;
91
92			while ((ptydev = getpty()) != NULL)
93			if ((pfd = open(ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0) {
94			*ttydev = ptydev;
95			return pfd;
96			}
97			#endif
98
99			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
100			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
101			{
102			# ifdef PTYS_ARE_GETPT
103			pfd = getpt();
104			# else
105			pfd = open("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
106			# endif
107			if (pfd >= 0) {
108			if (grantpt(pfd) == 0 /* change slave permissions */
109			&& unlockpt(pfd) == 0) { /* slave now unlocked */
110			ttydev = ptsname(pfd); / get slave's name */
111			return pfd;
112			}
113			close(pfd);
114			}
115			}
116			# endif
117			#endif
118
119			#ifdef PTYS_ARE_PTC
120			if ((pfd = open("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0) {
121			*ttydev = ttyname(pfd);
122			return pfd;
123			}
124			#endif
125
126			#ifdef PTYS_ARE_CLONE
127			if ((pfd = open("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0) {
128			*ttydev = ptsname(pfd);
129			return pfd;
130			}
131			#endif
132
133			#ifdef PTYS_ARE_NUMERIC
134			{
135			int idx;
136			char c1, c2;
137			char pty_name[] = "/dev/ptyp???";
138			char tty_name[] = "/dev/ttyp???";
139
140			c1 = &(pty_name[sizeof(pty_name) - 4]);
141			c2 = &(tty_name[sizeof(tty_name) - 4]);
142			for (idx = 0; idx < 256; idx++) {
143			sprintf(c1, "%d", idx);
144			sprintf(c2, "%d", idx);
145			if (access(tty_name, F_OK) < 0) {
146			idx = 256;
147			break;
148			}
149			if ((pfd = open(pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0) {
150			if (access(tty_name, R_OK \| W_OK) == 0) {
151			*ttydev = strdup(tty_name);
152			return pfd;
153			}
154			close(pfd);
155			}
156			}
157			}
158			#endif
159			#ifdef PTYS_ARE_SEARCHED
160			{
161			const char c1, c2;
162			char pty_name[] = "/dev/pty??";
163			char tty_name[] = "/dev/tty??";
164
165			# ifndef PTYCHAR1
166			# define PTYCHAR1 "pqrstuvwxyz"
167			# endif
168			# ifndef PTYCHAR2
169			# define PTYCHAR2 "0123456789abcdef"
170			# endif
171			for (c1 = PTYCHAR1; *c1; c1++) {
172			pty_name[(sizeof(pty_name) - 3)] =
173			tty_name[(sizeof(pty_name) - 3)] = *c1;
174			for (c2 = PTYCHAR2; *c2; c2++) {
175			pty_name[(sizeof(pty_name) - 2)] =
176			tty_name[(sizeof(pty_name) - 2)] = *c2;
177			if ((pfd = open(pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0) {
178			if (access(tty_name, R_OK \| W_OK) == 0) {
179			*ttydev = strdup(tty_name);
180			return pfd;
181			}
182			close(pfd);
183			}
184			}
185			}
186			}
187			#endif
188			return -1;
189			}
190
191			/----------------------------------------------------------------------/
192			/*
193			* Returns tty file descriptor, or -1 on failure
194			*/
195			/* EXTPROTO */
196			int
197			rxvt_get_tty(const char *ttydev)
198			{
199			return open(ttydev, O_RDWR \| O_NOCTTY, 0);
200			}
201
202			/----------------------------------------------------------------------/
203			/*
204			* Make our tty a controlling tty so that /dev/tty points to us
205			*/
206			/* EXTPROTO */
207			int
208			rxvt_control_tty(int fd_tty, const char *ttydev)
209			{
210			#ifndef __QNX__
211			int fd;
212
213			D_TTY((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
214			/* ---------------------------------------- */
215			# ifdef HAVE_SETSID
216			setsid();
217			# endif
218			# if defined(HAVE_SETPGID)
219			setpgid(0, 0);
220			# elif defined(HAVE_SETPGRP)
221			setpgrp(0, 0);
222			# endif
223			/* ---------------------------------------- */
224			# ifdef TIOCNOTTY
225			fd = open("/dev/tty", O_RDWR \| O_NOCTTY);
226			D_TTY((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
227			if (fd >= 0) {
228			ioctl(fd, TIOCNOTTY, NULL); /* void tty associations */
229			close(fd);
230			}
231			# endif
232			/* ---------------------------------------- */
233			fd = open("/dev/tty", O_RDWR \| O_NOCTTY);
234			D_TTY((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
235			if (fd >= 0)
236			close(fd); /* ouch: still have controlling tty */
237			/* ---------------------------------------- */
238			#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
239			/*
240			* Push STREAMS modules:
241			* ptem: pseudo-terminal hardware emulation module.
242			* ldterm: standard terminal line discipline.
243			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
244			*
245			* After we push the STREAMS modules, the first open() on the slave side
246			* (i.e. the next section between the dashes giving us "tty opened OK")
247			* should make the "ptem" (or "ldterm" depending upon either which OS
248			* version or which set of manual pages you have) module give us a
249			* controlling terminal. We must already have close()d the master side
250			* fd in this child process before we push STREAMS modules on because the
251			* documentation is really unclear about whether it is any close() on
252			* the master side or the last close() - i.e. a proper STREAMS dismantling
253			* close() - on the master side which causes a hang up to be sent
254			* through - Geoff Wing
255			*/
256			# ifdef HAVE_ISASTREAM
257			if (isastream(fd_tty) == 1)
258			# endif
259			{
260			D_TTY((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
261			ioctl(fd_tty, I_PUSH, "ptem");
262			ioctl(fd_tty, I_PUSH, "ldterm");
263			ioctl(fd_tty, I_PUSH, "ttcompat");
264			}
265			#endif
266			/* ---------------------------------------- */
267			# if defined(TIOCSCTTY)
268			fd = ioctl(fd_tty, TIOCSCTTY, NULL);
269			D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
270			# elif defined(TIOCSETCTTY)
271			fd = ioctl(fd_tty, TIOCSETCTTY, NULL);
272			D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
273			# else
274			fd = open(ttydev, O_RDWR);
275			D_TTY((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
276			if (fd >= 0)
277			close(fd);
278			# endif
279			/* ---------------------------------------- */
280			fd = open("/dev/tty", O_WRONLY);
281			D_TTY((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
282			if (fd < 0)
283			return -1; /* fatal */
284			close(fd);
285			/* ---------------------------------------- */
286			D_TTY((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
287			/* ---------------------------------------- */
288			#endif /* ! __QNX__ */
289			return 0;
290			}
291			/----------------------- end-of-file (C source) -----------------------/