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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.8 by pcg, Sat Mar 6 00:05:01 2004 UTC vs.
Revision 1.70 by sf-exg, Wed Jul 21 08:46:13 2010 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
1/*--------------------------------*-C-*---------------------------------* 4/*----------------------------------------------------------------------*
2 * File: ptytty.c 5 * File: ptytty.C
3 *----------------------------------------------------------------------* 6 *----------------------------------------------------------------------*
4 * 7 *
5 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
10 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
7 * 12 *
8 * This program is free software; you can redistribute it and/or modify 13 * 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 14 * 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 15 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 16 * (at your option) any later version.
… …
18 * You should have received a copy of the GNU General Public License 23 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software 24 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *---------------------------------------------------------------------*/ 26 *---------------------------------------------------------------------*/
22 27
23#include "../config.h" /* NECESSARY */ 28#include "config.h"
24 29
25/* 30#include "ptytty.h"
26 * Try to be self-contained except for the above autoconfig'd defines
27 */
28 31
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> 32#include <cstdlib>
38#endif 33#include <cstring>
39#ifdef HAVE_SYS_TYPES_H 34#include <csignal>
35
40# include <sys/types.h> 36#include <sys/types.h>
41#endif 37#include <sys/stat.h>
42#ifdef HAVE_UNISTD_H
43# include <unistd.h> 38#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> 39#include <fcntl.h>
50#endif 40
51#ifdef HAVE_SYS_IOCTL_H 41#ifdef HAVE_SYS_IOCTL_H
52# include <sys/ioctl.h> 42# include <sys/ioctl.h>
53#endif 43#endif
54#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 44#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
55# include <sys/stropts.h> /* for I_PUSH */ 45# include <sys/stropts.h> /* for I_PUSH */
56#endif 46#endif
57 47#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
58#ifdef DEBUG_TTY 48# include <stropts.h>
59# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
60#else
61# define D_TTY(x)
62#endif 49#endif
50#if defined(HAVE_PTY_H)
51# include <pty.h>
52#elif defined(HAVE_LIBUTIL_H)
53# include <libutil.h>
54#elif defined(HAVE_UTIL_H)
55# include <util.h>
56#endif
57#ifdef TTY_GID_SUPPORT
58#include <grp.h>
59#endif
60
61#include <cstdio>
62
63/////////////////////////////////////////////////////////////////////////////
63 64
64/* ------------------------------------------------------------------------- * 65/* ------------------------------------------------------------------------- *
65 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 66 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
66 * ------------------------------------------------------------------------- */ 67 * ------------------------------------------------------------------------- */
67/* 68/*
68 * Returns pty file descriptor, or -1 on failure 69 * Returns pty file descriptor, or -1 on failure
69 * If successful, ttydev is set to the name of the slave device. 70 * 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 * fd_tty _may_ also be set to an open fd to the slave device
71 */ 72 */
72/* EXTPROTO */ 73#if defined(UNIX98_PTY)
73int 74
75 static int
74rxvt_get_pty (int *fd_tty, const char **ttydev) 76 get_pty (int *fd_tty, 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 { 77 {
111# ifdef PTYS_ARE_GETPT 78 int pfd;
79
80# if defined(HAVE_GETPT)
112 pfd = getpt (); 81 pfd = getpt();
82# elif defined(HAVE_POSIX_OPENPT)
83 pfd = posix_openpt (O_RDWR);
113# else 84# else
114
115 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 85 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
116# endif 86# endif
117 87
118 if (pfd >= 0) 88 if (pfd >= 0)
119 { 89 {
120 if (grantpt (pfd) == 0 /* change slave permissions */ 90 if (grantpt (pfd) == 0 /* change slave permissions */
121 && unlockpt (pfd) == 0) 91 && unlockpt (pfd) == 0)
92 {
122 { /* slave now unlocked */ 93 /* slave now unlocked */
123 *ttydev = ptsname (pfd); /* get slave's name */ 94 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
124 return pfd; 95 return pfd;
125 } 96 }
97
126 close (pfd); 98 close (pfd);
127 } 99 }
100
101 return -1;
128 } 102 }
129# endif
130#endif
131 103
132#ifdef PTYS_ARE_PTC 104#elif defined(HAVE_OPENPTY)
133 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
134 {
135 *ttydev = ttyname (pfd);
136 return pfd;
137 }
138#endif
139 105
140#ifdef PTYS_ARE_CLONE 106 static int
141 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 107 get_pty (int *fd_tty, char **ttydev)
142 {
143 *ttydev = ptsname (pfd);
144 return pfd;
145 }
146#endif
147
148#ifdef PTYS_ARE_NUMERIC
149 { 108 {
150 int idx; 109 int pfd;
151 char *c1, *c2; 110 int res;
152 char pty_name[] = "/dev/ptyp???";
153 char tty_name[] = "/dev/ttyp???";
154 111
155 c1 = & (pty_name[sizeof (pty_name) - 4]); 112 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
156 c2 = & (tty_name[sizeof (tty_name) - 4]); 113
157 for (idx = 0; idx < 256; idx++) 114 if (res != -1)
158 { 115 {
159 sprintf (c1, "%d", idx); 116 *ttydev = strdup (ttyname (*fd_tty));
160 sprintf (c2, "%d", idx); 117 return pfd;
161 if (access (tty_name, F_OK) < 0) 118 }
119
120 return -1;
121 }
122
123#elif defined(HAVE__GETPTY)
124
125 static int
126 get_pty (int *fd_tty, char **ttydev)
127 {
128 int pfd;
129 char *slave;
130
131 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
132
133 if (slave != NULL)
134 {
135 *ttydev = strdup (slave);
136 return pfd;
137 }
138
139 return -1;
140 }
141
142#else
143
144 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
145 static int
146 get_pty (int *fd_tty, char **ttydev)
147 {
148 int pfd;
149 int i;
150 char pty_name[32];
151 char tty_name[32];
152 const char *majors = "pqrstuvwxyzabcde";
153 const char *minors = "0123456789abcdef";
154
155 for (i = 0; i < 256; i++)
156 {
157 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
158 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
159
160 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
162 { 161 {
163 idx = 256; 162 snprintf(pty_name, 32, "/dev/ptyp%d", i);
164 break; 163 snprintf(tty_name, 32, "/dev/ttyp%d", i);
164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
165 continue;
165 } 166 }
166 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 167
168 if (access (tty_name, R_OK | W_OK) == 0)
167 { 169 {
168 if (access (tty_name, R_OK | W_OK) == 0)
169 {
170 *ttydev = strdup (tty_name); 170 *ttydev = strdup (tty_name);
171 return pfd; 171 return pfd;
172 }
173 close (pfd);
174 } 172 }
173
174 close (pfd);
175 } 175 }
176
177 return -1;
176 } 178 }
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??";
183 179
184# ifndef PTYCHAR1
185# define PTYCHAR1 "pqrstuvwxyz"
186# endif 180#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}
214 181
215/*----------------------------------------------------------------------*/ 182/*----------------------------------------------------------------------*/
216/* 183/*
217 * Returns tty file descriptor, or -1 on failure 184 * Returns tty file descriptor, or -1 on failure
218 */ 185 */
219/* EXTPROTO */ 186static int
220int
221rxvt_get_tty (const char *ttydev) 187get_tty (char *ttydev)
222{ 188{
223 return open (ttydev, O_RDWR | O_NOCTTY, 0); 189 return open (ttydev, O_RDWR | O_NOCTTY, 0);
224} 190}
225 191
226/*----------------------------------------------------------------------*/ 192/*----------------------------------------------------------------------*/
227/* 193/*
228 * Make our tty a controlling tty so that /dev/tty points to us 194 * Make our tty a controlling tty so that /dev/tty points to us
229 */ 195 */
230/* EXTPROTO */ 196static int
231int 197control_tty (int fd_tty)
232rxvt_control_tty (int fd_tty, const char *ttydev)
233{ 198{
234#ifndef __QNX__
235 int fd; 199 int fd;
236 200
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 (); 201 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
249 202
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) 203#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
265 /* 204 /*
266 * Push STREAMS modules: 205 * Push STREAMS modules:
267 * ptem: pseudo-terminal hardware emulation module. 206 * ptem: pseudo-terminal hardware emulation module.
268 * ldterm: standard terminal line discipline. 207 * ldterm: standard terminal line discipline.
269 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 208 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
… …
277 * documentation is really unclear about whether it is any close () on 216 * 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 217 * 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 218 * close () - on the master side which causes a hang up to be sent
280 * through - Geoff Wing 219 * through - Geoff Wing
281 */ 220 */
282# ifdef HAVE_ISASTREAM 221#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
283 if (isastream (fd_tty) == 1) 222 if (isastream (fd_tty) == 1)
284# endif 223# endif
285 { 224 {
286 D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules"));
287 ioctl (fd_tty, I_PUSH, "ptem"); 225 ioctl (fd_tty, I_PUSH, "ptem");
288 ioctl (fd_tty, I_PUSH, "ldterm"); 226 ioctl (fd_tty, I_PUSH, "ldterm");
289 ioctl (fd_tty, I_PUSH, "ttcompat"); 227 ioctl (fd_tty, I_PUSH, "ttcompat");
290 } 228 }
291#endif 229#endif
292 /* ---------------------------------------- */ 230
293# if defined(TIOCSCTTY) 231#ifdef TIOCSCTTY
294 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 232 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 233#else
300 fd = open (ttydev, O_RDWR); 234 fd = open (ttyname (fd_tty), O_RDWR);
301 D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK"));
302 if (fd >= 0) 235 if (fd >= 0)
303 close (fd); 236 close (fd);
237#endif
238
239 fd = open ("/dev/tty", O_WRONLY);
240 if (fd < 0)
241 return -1; /* fatal */
242
243 close (fd);
244
245 return 0;
246}
247
248void
249ptytty::close_tty ()
250{
251 if (tty < 0)
252 return;
253
254 close (tty);
255 tty = -1;
256}
257
258bool
259ptytty::make_controlling_tty ()
260{
261 return control_tty (tty) >= 0;
262}
263
264void
265ptytty::set_utf8_mode (bool on)
266{
267#ifdef IUTF8
268 if (pty < 0)
269 return;
270
271 struct termios tio;
272
273 if (tcgetattr (pty, &tio) != -1)
274 {
275 tcflag_t new_cflag = tio.c_iflag;
276
277 if (on)
278 new_cflag |= IUTF8;
279 else
280 new_cflag &= ~IUTF8;
281
282 if (new_cflag != tio.c_iflag)
283 {
284 tio.c_iflag = new_cflag;
285 tcsetattr (pty, TCSANOW, &tio);
286 }
287 }
288#endif
289}
290
291static struct ttyconf {
292 gid_t gid;
293 mode_t mode;
294
295 ttyconf ()
296 {
297#ifdef TTY_GID_SUPPORT
298 struct group *gr = getgrnam ("tty");
299
300 if (gr)
301 {
302 /* change group ownership of tty to "tty" */
303 mode = S_IRUSR | S_IWUSR | S_IWGRP;
304 gid = gr->gr_gid;
305 }
306 else
307#endif /* TTY_GID_SUPPORT */
308 {
309 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
310 gid = 0;
311 }
312 }
313} ttyconf;
314
315ptytty_unix::ptytty_unix ()
316{
317 name = 0;
318#if UTMP_SUPPORT
319 cmd_pid = 0;
320#endif
321}
322
323ptytty_unix::~ptytty_unix ()
324{
325#if UTMP_SUPPORT
326 logout ();
327#endif
328 put ();
329}
330
331void
332ptytty_unix::put ()
333{
334 if (name)
335 {
336 chmod (name, RESTORE_TTY_MODE);
337 chown (name, 0, ttyconf.gid);
338 }
339
340 close_tty ();
341
342 if (pty >= 0)
343 close (pty);
344
345 free (name);
346
347 pty = tty = -1;
348 name = 0;
349}
350
351bool
352ptytty_unix::get ()
353{
354 /* get master (pty) */
355 if ((pty = get_pty (&tty, &name)) < 0)
356 return false;
357
358 fcntl (pty, F_SETFL, O_NONBLOCK);
359
360 /* get slave (tty) */
361 if (tty < 0)
362 {
363#ifndef NO_SETOWNER_TTYDEV
364 chown (name, getuid (), ttyconf.gid); /* fail silently */
365 chmod (name, ttyconf.mode);
366# ifdef HAVE_REVOKE
367 revoke (name);
304# endif 368# endif
305 /* ---------------------------------------- */ 369#endif
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__ */
315 370
371 if ((tty = get_tty (name)) < 0)
372 {
373 put ();
374 return false;
375 }
376 }
377
316 return 0; 378 return true;
317} 379}
318/*----------------------- end-of-file (C source) -----------------------*/ 380

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