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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.4 by pcg, Tue Dec 2 21:49:46 2003 UTC vs.
Revision 1.67 by ayin, Mon Nov 19 11:26:34 2007 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 * $Id: ptytty.C,v 1.4 2003/12/02 21:49:46 pcg Exp $
5 * 7 *
6 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
7 * 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>
8 * 12 *
9 * 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
10 * 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
11 * the Free Software Foundation; either version 2 of the License, or 15 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 16 * (at your option) any later version.
… …
19 * 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
20 * along with this program; if not, write to the Free Software 24 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 26 *---------------------------------------------------------------------*/
23 27
24#include "../config.h" /* NECESSARY */ 28#include "../config.h"
25 29
26/* 30#include "ptytty.h"
27 * Try to be self-contained except for the above autoconfig'd defines
28 */
29 31
30#include <stdio.h>
31#ifdef HAVE_STDLIB_H
32# include <stdlib.h> 32#include <cstdlib>
33#endif 33#include <cstring>
34#ifdef HAVE_SYS_TYPES_H 34#include <csignal>
35
35# include <sys/types.h> 36#include <sys/types.h>
36#endif
37#ifdef HAVE_UNISTD_H
38# include <unistd.h> 37#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> 38#include <fcntl.h>
45#endif 39
46#ifdef HAVE_SYS_IOCTL_H 40#ifdef HAVE_SYS_IOCTL_H
47# include <sys/ioctl.h> 41# include <sys/ioctl.h>
48#endif 42#endif
49#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 43#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
50# include <sys/stropts.h> /* for I_PUSH */ 44# include <sys/stropts.h> /* for I_PUSH */
51#endif 45#endif
52 46#ifdef HAVE_ISASTREAM
53#ifdef DEBUG_TTY 47# include <stropts.h>
54# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
55#else
56# define D_TTY(x)
57#endif 48#endif
49#if defined(HAVE_PTY_H)
50# include <pty.h>
51#elif defined(HAVE_LIBUTIL_H)
52# include <libutil.h>
53#elif defined(HAVE_UTIL_H)
54# include <util.h>
55#endif
56#ifdef TTY_GID_SUPPORT
57#include <grp.h>
58#endif
59
60#include <cstdio>
61
62/////////////////////////////////////////////////////////////////////////////
58 63
59/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
60 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
61 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
62/* 67/*
63 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
64 * If successful, ttydev is set to the name of the slave device. 69 * If successful, ttydev is set to the name of the slave device.
65 * fd_tty _may_ also be set to an open fd to the slave device 70 * fd_tty _may_ also be set to an open fd to the slave device
66 */ 71 */
67/* EXTPROTO */ 72#if defined(UNIX98_PTY)
68int 73
74 static int
69rxvt_get_pty(int *fd_tty, const char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
70{ 76 {
71 int pfd; 77 int pfd;
72 78
73#ifdef PTYS_ARE_OPENPTY 79# if defined(HAVE_GETPT)
74 80 pfd = getpt();
75 char tty_name[sizeof "/dev/pts/????\0"]; 81# elif defined(HAVE_POSIX_OPENPT)
76 82 pfd = posix_openpt (O_RDWR);
77 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) 83# else
78 { 84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
79 *ttydev = strdup(tty_name);
80 return pfd;
81 }
82#endif 85# endif
83 86
84#ifdef PTYS_ARE__GETPTY 87 if (pfd >= 0)
85 *ttydev = _getpty(&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
86 if (*ttydev != NULL)
87 return pfd;
88#endif
89
90#ifdef PTYS_ARE_GETPTY
91
92 char *ptydev;
93
94 while ((ptydev = getpty()) != NULL)
95 if ((pfd = open(ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
96 { 88 {
97 *ttydev = ptydev; 89 if (grantpt (pfd) == 0 /* change slave permissions */
90 && unlockpt (pfd) == 0)
91 { /* slave now unlocked */
92 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
93 return pfd;
94 }
95
96 close (pfd);
97 }
98
99 return -1;
100 }
101
102#elif defined(HAVE_OPENPTY)
103
104 static int
105 get_pty (int *fd_tty, char **ttydev)
106 {
107 int pfd;
108 int res;
109
110 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
111
112 if (res != -1)
113 {
114 *ttydev = strdup (ttyname (*fd_tty));
98 return pfd; 115 return pfd;
99 } 116 }
100#endif
101 117
102#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) 118 return -1;
103# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) 119 }
104 120
105 { 121#elif defined(HAVE__GETPTY)
106# ifdef PTYS_ARE_GETPT
107 pfd = getpt();
108# else
109 122
123 static int
124 get_pty (int *fd_tty, char **ttydev)
125 {
126 int pfd;
127 char *slave;
128
129 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
130
131 if (slave != NULL) {
132 *ttydev = strdup (slave);
133 return pfd;
134 }
135
136 return -1;
137 }
138
139#elif defined(HAVE_DEV_PTC)
140
141 static int
142 get_pty (int *fd_tty, char **ttydev)
143 {
144 int pfd;
145
110 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 146 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
111# endif
112
113 if (pfd >= 0)
114 { 147 {
115 if (grantpt(pfd) == 0 /* change slave permissions */ 148 *ttydev = strdup (ttyname (pfd));
116 && unlockpt(pfd) == 0) 149 return pfd;
117 { /* slave now unlocked */ 150 }
118 *ttydev = ptsname(pfd); /* get slave's name */ 151
152 return -1;
153 }
154
155#elif defined(HAVE_DEV_CLONE)
156
157 static int
158 get_pty (int *fd_tty, char **ttydev)
159 {
160 int pfd;
161
162 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
163 {
164 *ttydev = strdup (ptsname (pfd));
165 return pfd;
166 }
167
168 return -1;
169 }
170
171#else
172
173 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
174 static int
175 get_pty (int *fd_tty, char **ttydev)
176 {
177 int pfd;
178 int i;
179 char pty_name[32];
180 char tty_name[32];
181 const char *majors = "pqrstuvwxyzabcde";
182 const char *minors = "0123456789abcdef";
183
184 for (i = 0; i < 256; i++)
185 {
186 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
187 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
188
189 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
190 {
191 snprintf(pty_name, 32, "/dev/ptyp%d", i);
192 snprintf(tty_name, 32, "/dev/ttyp%d", i);
193 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
194 continue;
195 }
196
197 if (access (tty_name, R_OK | W_OK) == 0)
198 {
199 *ttydev = strdup (tty_name);
119 return pfd; 200 return pfd;
120 } 201 }
202
121 close(pfd); 203 close (pfd);
122 } 204 }
123 }
124# endif
125#endif
126 205
127#ifdef PTYS_ARE_PTC
128 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
129 {
130 *ttydev = ttyname(pfd);
131 return pfd;
132 }
133#endif
134
135#ifdef PTYS_ARE_CLONE
136 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
137 {
138 *ttydev = ptsname(pfd);
139 return pfd;
140 }
141#endif
142
143#ifdef PTYS_ARE_NUMERIC
144 {
145 int idx;
146 char *c1, *c2;
147 char pty_name[] = "/dev/ptyp???";
148 char tty_name[] = "/dev/ttyp???";
149
150 c1 = &(pty_name[sizeof(pty_name) - 4]);
151 c2 = &(tty_name[sizeof(tty_name) - 4]);
152 for (idx = 0; idx < 256; idx++)
153 {
154 sprintf(c1, "%d", idx);
155 sprintf(c2, "%d", idx);
156 if (access(tty_name, F_OK) < 0)
157 {
158 idx = 256;
159 break;
160 }
161 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
162 {
163 if (access(tty_name, R_OK | W_OK) == 0)
164 {
165 *ttydev = strdup(tty_name);
166 return pfd;
167 }
168 close(pfd);
169 }
170 }
171 }
172#endif
173#ifdef PTYS_ARE_SEARCHED
174 {
175 const char *c1, *c2;
176 char pty_name[] = "/dev/pty??";
177 char tty_name[] = "/dev/tty??";
178
179# ifndef PTYCHAR1
180# define PTYCHAR1 "pqrstuvwxyz"
181# endif
182# ifndef PTYCHAR2
183# define PTYCHAR2 "0123456789abcdef"
184# endif
185
186 for (c1 = PTYCHAR1; *c1; c1++)
187 {
188 pty_name[(sizeof(pty_name) - 3)] =
189 tty_name[(sizeof(pty_name) - 3)] = *c1;
190 for (c2 = PTYCHAR2; *c2; c2++)
191 {
192 pty_name[(sizeof(pty_name) - 2)] =
193 tty_name[(sizeof(pty_name) - 2)] = *c2;
194 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
195 {
196 if (access(tty_name, R_OK | W_OK) == 0)
197 {
198 *ttydev = strdup(tty_name);
199 return pfd;
200 }
201 close(pfd);
202 }
203 }
204 }
205 }
206#endif
207 return -1; 206 return -1;
208} 207 }
208
209#endif
209 210
210/*----------------------------------------------------------------------*/ 211/*----------------------------------------------------------------------*/
211/* 212/*
212 * Returns tty file descriptor, or -1 on failure 213 * Returns tty file descriptor, or -1 on failure
213 */ 214 */
214/* EXTPROTO */ 215static int
215int
216rxvt_get_tty (const char *ttydev) 216get_tty (char *ttydev)
217{ 217{
218 return open (ttydev, O_RDWR | O_NOCTTY, 0); 218 return open (ttydev, O_RDWR | O_NOCTTY, 0);
219} 219}
220 220
221/*----------------------------------------------------------------------*/ 221/*----------------------------------------------------------------------*/
222/* 222/*
223 * Make our tty a controlling tty so that /dev/tty points to us 223 * Make our tty a controlling tty so that /dev/tty points to us
224 */ 224 */
225/* EXTPROTO */ 225static int
226int 226control_tty (int fd_tty)
227rxvt_control_tty (int fd_tty, const char *ttydev)
228{ 227{
229#ifndef __QNX__
230 int fd; 228 int fd;
231 229
232 D_TTY ((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
233 /* ---------------------------------------- */
234# ifdef HAVE_SETSID
235 setsid (); 230 setsid ();
236# endif
237# if defined(HAVE_SETPGID)
238 setpgid (0, 0);
239# elif defined(HAVE_SETPGRP)
240 setpgrp (0, 0);
241# endif
242 /* ---------------------------------------- */
243# ifdef TIOCNOTTY
244 231
245 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
246 D_TTY ((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
247 if (fd >= 0)
248 {
249 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
250 close (fd);
251 }
252# endif
253 /* ---------------------------------------- */
254 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
255 D_TTY ((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
256 if (fd >= 0)
257 close (fd); /* ouch: still have controlling tty */
258 /* ---------------------------------------- */
259#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 232#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
260 /* 233 /*
261 * Push STREAMS modules: 234 * Push STREAMS modules:
262 * ptem: pseudo-terminal hardware emulation module. 235 * ptem: pseudo-terminal hardware emulation module.
263 * ldterm: standard terminal line discipline. 236 * ldterm: standard terminal line discipline.
264 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 237 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
265 * 238 *
266 * After we push the STREAMS modules, the first open() on the slave side 239 * After we push the STREAMS modules, the first open () on the slave side
267 * (i.e. the next section between the dashes giving us "tty opened OK") 240 * (i.e. the next section between the dashes giving us "tty opened OK")
268 * should make the "ptem" (or "ldterm" depending upon either which OS 241 * should make the "ptem" (or "ldterm" depending upon either which OS
269 * version or which set of manual pages you have) module give us a 242 * version or which set of manual pages you have) module give us a
270 * controlling terminal. We must already have close()d the master side 243 * controlling terminal. We must already have close ()d the master side
271 * fd in this child process before we push STREAMS modules on because the 244 * fd in this child process before we push STREAMS modules on because the
272 * documentation is really unclear about whether it is any close() on 245 * documentation is really unclear about whether it is any close () on
273 * the master side or the last close() - i.e. a proper STREAMS dismantling 246 * the master side or the last close () - i.e. a proper STREAMS dismantling
274 * close() - on the master side which causes a hang up to be sent 247 * close () - on the master side which causes a hang up to be sent
275 * through - Geoff Wing 248 * through - Geoff Wing
276 */ 249 */
277# ifdef HAVE_ISASTREAM 250# ifdef HAVE_ISASTREAM
278 if (isastream (fd_tty) == 1) 251 if (isastream (fd_tty) == 1)
279# endif 252# endif
280 { 253 {
281 D_TTY ((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
282 ioctl (fd_tty, I_PUSH, "ptem"); 254 ioctl (fd_tty, I_PUSH, "ptem");
283 ioctl (fd_tty, I_PUSH, "ldterm"); 255 ioctl (fd_tty, I_PUSH, "ldterm");
284 ioctl (fd_tty, I_PUSH, "ttcompat"); 256 ioctl (fd_tty, I_PUSH, "ttcompat");
285 } 257 }
286#endif 258#endif
287 /* ---------------------------------------- */ 259
288# if defined(TIOCSCTTY) 260#ifdef TIOCSCTTY
289 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 261 ioctl (fd_tty, TIOCSCTTY, NULL);
290 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
291# elif defined(TIOCSETCTTY)
292 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
293 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
294# else 262#else
295 fd = open (ttydev, O_RDWR); 263 fd = open (ttyname (fd_tty), O_RDWR);
296 D_TTY ((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
297 if (fd >= 0) 264 if (fd >= 0)
298 close(fd); 265 close (fd);
266#endif
267
268 fd = open ("/dev/tty", O_WRONLY);
269 if (fd < 0)
270 return -1; /* fatal */
271
272 close (fd);
273
274 return 0;
275}
276
277void
278ptytty::close_tty ()
279{
280 if (tty < 0)
281 return;
282
283 close (tty);
284 tty = -1;
285}
286
287bool
288ptytty::make_controlling_tty ()
289{
290 return control_tty (tty) >= 0;
291}
292
293void
294ptytty::set_utf8_mode (bool on)
295{
296#ifdef IUTF8
297 if (pty < 0)
298 return;
299
300 struct termios tio;
301
302 if (tcgetattr (pty, &tio) != -1)
303 {
304 tcflag_t new_cflag = tio.c_iflag;
305
306 if (on)
307 new_cflag |= IUTF8;
308 else
309 new_cflag &= ~IUTF8;
310
311 if (new_cflag != tio.c_iflag)
312 {
313 tio.c_iflag = new_cflag;
314 tcsetattr (pty, TCSANOW, &tio);
315 }
316 }
317#endif
318}
319
320static struct ttyconf {
321 gid_t gid;
322 mode_t mode;
323
324 ttyconf ()
325 {
326#ifdef TTY_GID_SUPPORT
327 struct group *gr = getgrnam ("tty");
328
329 if (gr)
330 { /* change group ownership of tty to "tty" */
331 mode = S_IRUSR | S_IWUSR | S_IWGRP;
332 gid = gr->gr_gid;
333 }
334 else
335#endif /* TTY_GID_SUPPORT */
336 {
337 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
338 gid = 0;
339 }
340 }
341} ttyconf;
342
343ptytty_unix::ptytty_unix ()
344{
345 name = 0;
346#if UTMP_SUPPORT
347 cmd_pid = 0;
348#endif
349}
350
351ptytty_unix::~ptytty_unix ()
352{
353#if UTMP_SUPPORT
354 logout ();
355#endif
356 put ();
357}
358
359void
360ptytty_unix::put ()
361{
362 if (name)
363 {
364 chmod (name, RESTORE_TTY_MODE);
365 chown (name, 0, ttyconf.gid);
366 }
367
368 close_tty ();
369
370 if (pty >= 0)
371 close (pty);
372
373 free (name);
374
375 pty = tty = -1;
376 name = 0;
377}
378
379bool
380ptytty_unix::get ()
381{
382 /* get master (pty) */
383 if ((pty = get_pty (&tty, &name)) < 0)
384 return false;
385
386 fcntl (pty, F_SETFL, O_NONBLOCK);
387
388 /* get slave (tty) */
389 if (tty < 0)
390 {
391#ifndef NO_SETOWNER_TTYDEV
392 chown (name, getuid (), ttyconf.gid); /* fail silently */
393 chmod (name, ttyconf.mode);
394# ifdef HAVE_REVOKE
395 revoke (name);
299# endif 396# endif
300 /* ---------------------------------------- */ 397#endif
301 fd = open ("/dev/tty", O_WRONLY);
302 D_TTY ((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
303 if (fd < 0)
304 return -1; /* fatal */
305 close (fd);
306 /* ---------------------------------------- */
307 D_TTY ((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
308 /* ---------------------------------------- */
309#endif /* ! __QNX__ */
310 398
399 if ((tty = get_tty (name)) < 0)
400 {
401 put ();
402 return false;
403 }
404 }
405
311 return 0; 406 return true;
312} 407}
313/*----------------------- end-of-file (C source) -----------------------*/ 408

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