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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 1.71 by root, Mon Feb 21 07:41:02 2011 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 <schmorp@schmorp.de>
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#include <sys/stat.h>
37#ifdef HAVE_UNISTD_H
38# include <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> 39#include <fcntl.h>
45#endif 40
46#ifdef HAVE_SYS_IOCTL_H 41#ifdef HAVE_SYS_IOCTL_H
47# include <sys/ioctl.h> 42# include <sys/ioctl.h>
48#endif 43#endif
49#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 44#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
50# include <sys/stropts.h> /* for I_PUSH */ 45# include <sys/stropts.h> /* for I_PUSH */
51#endif 46#endif
52 47#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
53#ifdef DEBUG_TTY 48# include <stropts.h>
54# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
55#else
56# define D_TTY(x)
57#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/////////////////////////////////////////////////////////////////////////////
58 64
59/* ------------------------------------------------------------------------- * 65/* ------------------------------------------------------------------------- *
60 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 66 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
61 * ------------------------------------------------------------------------- */ 67 * ------------------------------------------------------------------------- */
62/* 68/*
63 * Returns pty file descriptor, or -1 on failure 69 * Returns pty file descriptor, or -1 on failure
64 * 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.
65 * 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
66 */ 72 */
67/* EXTPROTO */ 73#if defined(UNIX98_PTY)
68int 74
75 static int
69rxvt_get_pty(int *fd_tty, const char **ttydev) 76 get_pty (int *fd_tty, char **ttydev)
70{ 77 {
71 int pfd; 78 int pfd;
72 79
73#ifdef PTYS_ARE_OPENPTY 80# if defined(HAVE_GETPT)
74 81 pfd = getpt();
75 char tty_name[sizeof "/dev/pts/????\0"]; 82# elif defined(HAVE_POSIX_OPENPT)
76 83 pfd = posix_openpt (O_RDWR);
77 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) 84# else
78 { 85 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
79 *ttydev = strdup(tty_name);
80 return pfd;
81 }
82#endif 86# endif
83 87
84#ifdef PTYS_ARE__GETPTY 88 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 { 89 {
97 *ttydev = ptydev; 90 if (grantpt (pfd) == 0 /* change slave permissions */
91 && unlockpt (pfd) == 0)
92 {
93 /* slave now unlocked */
94 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
95 return pfd;
96 }
97
98 close (pfd);
99 }
100
101 return -1;
102 }
103
104#elif defined(HAVE_OPENPTY)
105
106 static int
107 get_pty (int *fd_tty, char **ttydev)
108 {
109 int pfd;
110 int res;
111
112 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
113
114 if (res != -1)
115 {
116 *ttydev = strdup (ttyname (*fd_tty));
98 return pfd; 117 return pfd;
99 } 118 }
100#endif
101 119
102#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) 120 return -1;
103# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) 121 }
104 122
123#elif defined(HAVE__GETPTY)
124
125 static int
126 get_pty (int *fd_tty, char **ttydev)
105 { 127 {
106# ifdef PTYS_ARE_GETPT 128 int pfd;
107 pfd = getpt(); 129 char *slave;
108# else
109 130
110 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 131 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
111# endif
112 132
113 if (pfd >= 0) 133 if (slave != NULL)
114 { 134 {
115 if (grantpt(pfd) == 0 /* change slave permissions */ 135 *ttydev = strdup (slave);
116 && unlockpt(pfd) == 0) 136 return pfd;
117 { /* slave now unlocked */ 137 }
118 *ttydev = ptsname(pfd); /* get slave's name */ 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)
161 {
162 snprintf(pty_name, 32, "/dev/ptyp%d", i);
163 snprintf(tty_name, 32, "/dev/ttyp%d", i);
164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
165 continue;
166 }
167
168 if (access (tty_name, R_OK | W_OK) == 0)
169 {
170 *ttydev = strdup (tty_name);
119 return pfd; 171 return pfd;
120 } 172 }
173
121 close(pfd); 174 close (pfd);
122 } 175 }
176
177 return -1;
123 } 178 }
179
124# endif 180#endif
125#endif
126
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;
208}
209 181
210/*----------------------------------------------------------------------*/ 182/*----------------------------------------------------------------------*/
211/* 183/*
212 * Returns tty file descriptor, or -1 on failure 184 * Returns tty file descriptor, or -1 on failure
213 */ 185 */
214/* EXTPROTO */ 186static int
215int
216rxvt_get_tty (const char *ttydev) 187get_tty (char *ttydev)
217{ 188{
218 return open (ttydev, O_RDWR | O_NOCTTY, 0); 189 return open (ttydev, O_RDWR | O_NOCTTY, 0);
219} 190}
220 191
221/*----------------------------------------------------------------------*/ 192/*----------------------------------------------------------------------*/
222/* 193/*
223 * 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
224 */ 195 */
225/* EXTPROTO */ 196static int
226int 197control_tty (int fd_tty)
227rxvt_control_tty (int fd_tty, const char *ttydev)
228{ 198{
229#ifndef __QNX__
230 int fd; 199 int fd;
231 200
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 (); 201 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
244 202
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) 203#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
260 /* 204 /*
261 * Push STREAMS modules: 205 * Push STREAMS modules:
262 * ptem: pseudo-terminal hardware emulation module. 206 * ptem: pseudo-terminal hardware emulation module.
263 * ldterm: standard terminal line discipline. 207 * ldterm: standard terminal line discipline.
264 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 208 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
265 * 209 *
266 * After we push the STREAMS modules, the first open() on the slave side 210 * 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") 211 * (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 212 * 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 213 * 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 214 * 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 215 * 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 216 * 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 217 * 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 218 * close () - on the master side which causes a hang up to be sent
275 * through - Geoff Wing 219 * through - Geoff Wing
276 */ 220 */
277# ifdef HAVE_ISASTREAM 221#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
278 if (isastream (fd_tty) == 1) 222 if (isastream (fd_tty) == 1)
279# endif 223# endif
280 { 224 {
281 D_TTY ((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
282 ioctl (fd_tty, I_PUSH, "ptem"); 225 ioctl (fd_tty, I_PUSH, "ptem");
283 ioctl (fd_tty, I_PUSH, "ldterm"); 226 ioctl (fd_tty, I_PUSH, "ldterm");
284 ioctl (fd_tty, I_PUSH, "ttcompat"); 227 ioctl (fd_tty, I_PUSH, "ttcompat");
285 } 228 }
286#endif 229#endif
287 /* ---------------------------------------- */ 230
288# if defined(TIOCSCTTY) 231#ifdef TIOCSCTTY
289 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 232 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 233#else
295 fd = open (ttydev, O_RDWR); 234 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) 235 if (fd >= 0)
298 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);
299# endif 368# endif
300 /* ---------------------------------------- */ 369#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__ */
310 370
371 if ((tty = get_tty (name)) < 0)
372 {
373 put ();
374 return false;
375 }
376 }
377
311 return 0; 378 return true;
312} 379}
313/*----------------------- end-of-file (C source) -----------------------*/ 380

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