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 |
#if 0 |
30 |
#ifdef HAVE_GETPT |
31 |
# define _GNU_SOURCE |
32 |
#endif |
33 |
#endif |
34 |
|
35 |
#include <cstdio> |
36 |
#ifdef HAVE_STDLIB_H |
37 |
# include <cstdlib> |
38 |
#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 |
# include <cstring> |
47 |
#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 |
|
58 |
#ifdef DEBUG_TTY |
59 |
# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr) |
60 |
#else |
61 |
# define D_TTY(x) |
62 |
#endif |
63 |
|
64 |
/* ------------------------------------------------------------------------- * |
65 |
* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
66 |
* ------------------------------------------------------------------------- */ |
67 |
/* |
68 |
* Returns pty file descriptor, or -1 on failure |
69 |
* If successful, ttydev is set to the name of the slave device. |
70 |
* fd_tty _may_ also be set to an open fd to the slave device |
71 |
*/ |
72 |
/* EXTPROTO */ |
73 |
int |
74 |
rxvt_get_pty (int *fd_tty, const char **ttydev) |
75 |
{ |
76 |
int pfd; |
77 |
|
78 |
#ifdef PTYS_ARE_OPENPTY |
79 |
|
80 |
char tty_name[sizeof "/dev/pts/????\0"]; |
81 |
|
82 |
if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) |
83 |
{ |
84 |
*ttydev = strdup (tty_name); |
85 |
return pfd; |
86 |
} |
87 |
#endif |
88 |
|
89 |
#ifdef PTYS_ARE__GETPTY |
90 |
*ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
91 |
if (*ttydev != NULL) |
92 |
return pfd; |
93 |
#endif |
94 |
|
95 |
#ifdef PTYS_ARE_GETPTY |
96 |
|
97 |
char *ptydev; |
98 |
|
99 |
while ((ptydev = getpty ()) != NULL) |
100 |
if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0) |
101 |
{ |
102 |
*ttydev = ptydev; |
103 |
return pfd; |
104 |
} |
105 |
#endif |
106 |
|
107 |
#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
108 |
# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) |
109 |
|
110 |
{ |
111 |
# ifdef PTYS_ARE_GETPT |
112 |
pfd = getpt (); |
113 |
# else |
114 |
|
115 |
pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
116 |
# endif |
117 |
|
118 |
if (pfd >= 0) |
119 |
{ |
120 |
if (grantpt (pfd) == 0 /* change slave permissions */ |
121 |
&& unlockpt (pfd) == 0) |
122 |
{ /* slave now unlocked */ |
123 |
*ttydev = ptsname (pfd); /* get slave's name */ |
124 |
return pfd; |
125 |
} |
126 |
close (pfd); |
127 |
} |
128 |
} |
129 |
# endif |
130 |
#endif |
131 |
|
132 |
#ifdef PTYS_ARE_PTC |
133 |
if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
134 |
{ |
135 |
*ttydev = ttyname (pfd); |
136 |
return pfd; |
137 |
} |
138 |
#endif |
139 |
|
140 |
#ifdef PTYS_ARE_CLONE |
141 |
if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
142 |
{ |
143 |
*ttydev = ptsname (pfd); |
144 |
return pfd; |
145 |
} |
146 |
#endif |
147 |
|
148 |
#ifdef PTYS_ARE_NUMERIC |
149 |
{ |
150 |
int idx; |
151 |
char *c1, *c2; |
152 |
char pty_name[] = "/dev/ptyp???"; |
153 |
char tty_name[] = "/dev/ttyp???"; |
154 |
|
155 |
c1 = & (pty_name[sizeof (pty_name) - 4]); |
156 |
c2 = & (tty_name[sizeof (tty_name) - 4]); |
157 |
for (idx = 0; idx < 256; idx++) |
158 |
{ |
159 |
sprintf (c1, "%d", idx); |
160 |
sprintf (c2, "%d", idx); |
161 |
if (access (tty_name, F_OK) < 0) |
162 |
{ |
163 |
idx = 256; |
164 |
break; |
165 |
} |
166 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
167 |
{ |
168 |
if (access (tty_name, R_OK | W_OK) == 0) |
169 |
{ |
170 |
*ttydev = strdup (tty_name); |
171 |
return pfd; |
172 |
} |
173 |
close (pfd); |
174 |
} |
175 |
} |
176 |
} |
177 |
#endif |
178 |
#ifdef PTYS_ARE_SEARCHED |
179 |
{ |
180 |
const char *c1, *c2; |
181 |
char pty_name[] = "/dev/pty??"; |
182 |
char tty_name[] = "/dev/tty??"; |
183 |
|
184 |
# ifndef PTYCHAR1 |
185 |
# define PTYCHAR1 "pqrstuvwxyz" |
186 |
# endif |
187 |
# ifndef PTYCHAR2 |
188 |
# define PTYCHAR2 "0123456789abcdef" |
189 |
# endif |
190 |
|
191 |
for (c1 = PTYCHAR1; *c1; c1++) |
192 |
{ |
193 |
pty_name[ (sizeof (pty_name) - 3)] = |
194 |
tty_name[ (sizeof (pty_name) - 3)] = *c1; |
195 |
for (c2 = PTYCHAR2; *c2; c2++) |
196 |
{ |
197 |
pty_name[ (sizeof (pty_name) - 2)] = |
198 |
tty_name[ (sizeof (pty_name) - 2)] = *c2; |
199 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
200 |
{ |
201 |
if (access (tty_name, R_OK | W_OK) == 0) |
202 |
{ |
203 |
*ttydev = strdup (tty_name); |
204 |
return pfd; |
205 |
} |
206 |
close (pfd); |
207 |
} |
208 |
} |
209 |
} |
210 |
} |
211 |
#endif |
212 |
return -1; |
213 |
} |
214 |
|
215 |
/*----------------------------------------------------------------------*/ |
216 |
/* |
217 |
* Returns tty file descriptor, or -1 on failure |
218 |
*/ |
219 |
/* EXTPROTO */ |
220 |
int |
221 |
rxvt_get_tty (const char *ttydev) |
222 |
{ |
223 |
return open (ttydev, O_RDWR | O_NOCTTY, 0); |
224 |
} |
225 |
|
226 |
/*----------------------------------------------------------------------*/ |
227 |
/* |
228 |
* Make our tty a controlling tty so that /dev/tty points to us |
229 |
*/ |
230 |
/* EXTPROTO */ |
231 |
int |
232 |
rxvt_control_tty (int fd_tty, const char *ttydev) |
233 |
{ |
234 |
#ifndef __QNX__ |
235 |
int fd; |
236 |
|
237 |
D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev)); |
238 |
/* ---------------------------------------- */ |
239 |
# ifdef HAVE_SETSID |
240 |
setsid (); |
241 |
# endif |
242 |
# if defined(HAVE_SETPGID) |
243 |
setpgid (0, 0); |
244 |
# elif defined(HAVE_SETPGRP) |
245 |
setpgrp (0, 0); |
246 |
# endif |
247 |
/* ---------------------------------------- */ |
248 |
# ifdef TIOCNOTTY |
249 |
|
250 |
fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
251 |
D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes")); |
252 |
if (fd >= 0) |
253 |
{ |
254 |
ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */ |
255 |
close (fd); |
256 |
} |
257 |
# endif |
258 |
/* ---------------------------------------- */ |
259 |
fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
260 |
D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)")); |
261 |
if (fd >= 0) |
262 |
close (fd); /* ouch: still have controlling tty */ |
263 |
/* ---------------------------------------- */ |
264 |
#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
265 |
/* |
266 |
* Push STREAMS modules: |
267 |
* ptem: pseudo-terminal hardware emulation module. |
268 |
* ldterm: standard terminal line discipline. |
269 |
* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
270 |
* |
271 |
* After we push the STREAMS modules, the first open () on the slave side |
272 |
* (i.e. the next section between the dashes giving us "tty opened OK") |
273 |
* should make the "ptem" (or "ldterm" depending upon either which OS |
274 |
* version or which set of manual pages you have) module give us a |
275 |
* controlling terminal. We must already have close ()d the master side |
276 |
* fd in this child process before we push STREAMS modules on because the |
277 |
* documentation is really unclear about whether it is any close () on |
278 |
* the master side or the last close () - i.e. a proper STREAMS dismantling |
279 |
* close () - on the master side which causes a hang up to be sent |
280 |
* through - Geoff Wing |
281 |
*/ |
282 |
# ifdef HAVE_ISASTREAM |
283 |
if (isastream (fd_tty) == 1) |
284 |
# endif |
285 |
{ |
286 |
D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules")); |
287 |
ioctl (fd_tty, I_PUSH, "ptem"); |
288 |
ioctl (fd_tty, I_PUSH, "ldterm"); |
289 |
ioctl (fd_tty, I_PUSH, "ttcompat"); |
290 |
} |
291 |
#endif |
292 |
/* ---------------------------------------- */ |
293 |
# if defined(TIOCSCTTY) |
294 |
fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
295 |
D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd)); |
296 |
# elif defined(TIOCSETCTTY) |
297 |
fd = ioctl (fd_tty, TIOCSETCTTY, NULL); |
298 |
D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd)); |
299 |
# else |
300 |
fd = open (ttydev, O_RDWR); |
301 |
D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK")); |
302 |
if (fd >= 0) |
303 |
close (fd); |
304 |
# endif |
305 |
/* ---------------------------------------- */ |
306 |
fd = open ("/dev/tty", O_WRONLY); |
307 |
D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)")); |
308 |
if (fd < 0) |
309 |
return -1; /* fatal */ |
310 |
close (fd); |
311 |
/* ---------------------------------------- */ |
312 |
D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ())); |
313 |
/* ---------------------------------------- */ |
314 |
#endif /* ! __QNX__ */ |
315 |
|
316 |
return 0; |
317 |
} |
318 |
/*----------------------- end-of-file (C source) -----------------------*/ |