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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.2 by pcg, Mon Nov 24 17:31:27 2003 UTC vs.
Revision 1.68 by ayin, Tue Dec 11 21:49:12 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 1.2 2003/11/24 17:31:27 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 47# include <stropts.h>
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 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/////////////////////////////////////////////////////////////////////////////
59 63
60/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
61 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
62 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
63/* 67/*
64 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
65 * 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.
66 * 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
67 */ 71 */
68/* EXTPROTO */ 72#if defined(UNIX98_PTY)
69int 73
74 static int
70rxvt_get_pty(int *fd_tty, const char **ttydev) 75 get_pty (int *fd_tty, 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 { 76 {
102# ifdef PTYS_ARE_GETPT 77 int pfd;
78
79# if defined(HAVE_GETPT)
103 pfd = getpt(); 80 pfd = getpt();
81# elif defined(HAVE_POSIX_OPENPT)
82 pfd = posix_openpt (O_RDWR);
104# else 83# else
105 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 84 pfd = open (CLONE_DEVICE, 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 85# endif
117#endif
118 86
119#ifdef PTYS_ARE_PTC 87 if (pfd >= 0)
88 {
89 if (grantpt (pfd) == 0 /* change slave permissions */
90 && unlockpt (pfd) == 0)
91 {
92 /* slave now unlocked */
93 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
94 return pfd;
95 }
96
97 close (pfd);
98 }
99
100 return -1;
101 }
102
103#elif defined(HAVE_OPENPTY)
104
105 static int
106 get_pty (int *fd_tty, char **ttydev)
107 {
108 int pfd;
109 int res;
110
111 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
112
113 if (res != -1)
114 {
115 *ttydev = strdup (ttyname (*fd_tty));
116 return pfd;
117 }
118
119 return -1;
120 }
121
122#elif defined(HAVE__GETPTY)
123
124 static int
125 get_pty (int *fd_tty, char **ttydev)
126 {
127 int pfd;
128 char *slave;
129
130 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
131
132 if (slave != NULL) {
133 *ttydev = strdup (slave);
134 return pfd;
135 }
136
137 return -1;
138 }
139
140#elif defined(HAVE_DEV_PTC)
141
142 static int
143 get_pty (int *fd_tty, char **ttydev)
144 {
145 int pfd;
146
120 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) { 147 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
121 *ttydev = ttyname(pfd); 148 {
122 return pfd; 149 *ttydev = strdup (ttyname (pfd));
150 return pfd;
123 } 151 }
124#endif
125 152
126#ifdef PTYS_ARE_CLONE 153 return -1;
154 }
155
156#elif defined(HAVE_DEV_CLONE)
157
158 static int
159 get_pty (int *fd_tty, char **ttydev)
160 {
161 int pfd;
162
127 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) { 163 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 { 164 {
135 int idx; 165 *ttydev = strdup (ptsname (pfd));
136 char *c1, *c2; 166 return pfd;
137 char pty_name[] = "/dev/ptyp???"; 167 }
138 char tty_name[] = "/dev/ttyp???";
139 168
140 c1 = &(pty_name[sizeof(pty_name) - 4]); 169 return -1;
141 c2 = &(tty_name[sizeof(tty_name) - 4]); 170 }
171
172#else
173
174 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
175 static int
176 get_pty (int *fd_tty, char **ttydev)
177 {
178 int pfd;
179 int i;
180 char pty_name[32];
181 char tty_name[32];
182 const char *majors = "pqrstuvwxyzabcde";
183 const char *minors = "0123456789abcdef";
184
142 for (idx = 0; idx < 256; idx++) { 185 for (i = 0; i < 256; i++)
143 sprintf(c1, "%d", idx); 186 {
144 sprintf(c2, "%d", idx); 187 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
145 if (access(tty_name, F_OK) < 0) { 188 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
146 idx = 256; 189
147 break;
148 }
149 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) { 190 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
191 {
192 snprintf(pty_name, 32, "/dev/ptyp%d", i);
193 snprintf(tty_name, 32, "/dev/ttyp%d", i);
194 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
195 continue;
196 }
197
150 if (access(tty_name, R_OK | W_OK) == 0) { 198 if (access (tty_name, R_OK | W_OK) == 0)
199 {
151 *ttydev = strdup(tty_name); 200 *ttydev = strdup (tty_name);
152 return pfd; 201 return pfd;
153 } 202 }
154 close(pfd); 203
155 } 204 close (pfd);
156 }
157 } 205 }
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??";
164 206
165# ifndef PTYCHAR1 207 return -1;
166# define PTYCHAR1 "pqrstuvwxyz" 208 }
209
167# endif 210#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}
190 211
191/*----------------------------------------------------------------------*/ 212/*----------------------------------------------------------------------*/
192/* 213/*
193 * Returns tty file descriptor, or -1 on failure 214 * Returns tty file descriptor, or -1 on failure
194 */ 215 */
195/* EXTPROTO */ 216static int
196int
197rxvt_get_tty(const char *ttydev) 217get_tty (char *ttydev)
198{ 218{
199 return open(ttydev, O_RDWR | O_NOCTTY, 0); 219 return open (ttydev, O_RDWR | O_NOCTTY, 0);
200} 220}
201 221
202/*----------------------------------------------------------------------*/ 222/*----------------------------------------------------------------------*/
203/* 223/*
204 * Make our tty a controlling tty so that /dev/tty points to us 224 * Make our tty a controlling tty so that /dev/tty points to us
205 */ 225 */
206/* EXTPROTO */ 226static int
207int 227control_tty (int fd_tty)
208rxvt_control_tty(int fd_tty, const char *ttydev)
209{ 228{
210#ifndef __QNX__ 229 int fd;
211 int fd;
212 230
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(); 231 setsid ();
217# endif 232
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) 233#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
239/* 234 /*
240 * Push STREAMS modules: 235 * Push STREAMS modules:
241 * ptem: pseudo-terminal hardware emulation module. 236 * ptem: pseudo-terminal hardware emulation module.
242 * ldterm: standard terminal line discipline. 237 * ldterm: standard terminal line discipline.
243 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 238 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
244 * 239 *
245 * After we push the STREAMS modules, the first open() on the slave side 240 * 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") 241 * (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 242 * 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 243 * 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 244 * 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 245 * 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 246 * 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 247 * 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 248 * close () - on the master side which causes a hang up to be sent
254 * through - Geoff Wing 249 * through - Geoff Wing
255 */ 250 */
256# ifdef HAVE_ISASTREAM 251# ifdef HAVE_ISASTREAM
257 if (isastream(fd_tty) == 1) 252 if (isastream (fd_tty) == 1)
258# endif 253# endif
259 { 254 {
260 D_TTY((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
261 ioctl(fd_tty, I_PUSH, "ptem"); 255 ioctl (fd_tty, I_PUSH, "ptem");
262 ioctl(fd_tty, I_PUSH, "ldterm"); 256 ioctl (fd_tty, I_PUSH, "ldterm");
263 ioctl(fd_tty, I_PUSH, "ttcompat"); 257 ioctl (fd_tty, I_PUSH, "ttcompat");
264 } 258 }
265#endif 259#endif
266/* ---------------------------------------- */ 260
267# if defined(TIOCSCTTY) 261#ifdef TIOCSCTTY
268 fd = ioctl(fd_tty, TIOCSCTTY, NULL); 262 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 263#else
274 fd = open(ttydev, O_RDWR); 264 fd = open (ttyname (fd_tty), O_RDWR);
275 D_TTY((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
276 if (fd >= 0) 265 if (fd >= 0)
266 close (fd);
267#endif
268
269 fd = open ("/dev/tty", O_WRONLY);
270 if (fd < 0)
271 return -1; /* fatal */
272
277 close(fd); 273 close (fd);
274
275 return 0;
276}
277
278void
279ptytty::close_tty ()
280{
281 if (tty < 0)
282 return;
283
284 close (tty);
285 tty = -1;
286}
287
288bool
289ptytty::make_controlling_tty ()
290{
291 return control_tty (tty) >= 0;
292}
293
294void
295ptytty::set_utf8_mode (bool on)
296{
297#ifdef IUTF8
298 if (pty < 0)
299 return;
300
301 struct termios tio;
302
303 if (tcgetattr (pty, &tio) != -1)
304 {
305 tcflag_t new_cflag = tio.c_iflag;
306
307 if (on)
308 new_cflag |= IUTF8;
309 else
310 new_cflag &= ~IUTF8;
311
312 if (new_cflag != tio.c_iflag)
313 {
314 tio.c_iflag = new_cflag;
315 tcsetattr (pty, TCSANOW, &tio);
316 }
317 }
318#endif
319}
320
321static struct ttyconf {
322 gid_t gid;
323 mode_t mode;
324
325 ttyconf ()
326 {
327#ifdef TTY_GID_SUPPORT
328 struct group *gr = getgrnam ("tty");
329
330 if (gr)
331 {
332 /* change group ownership of tty to "tty" */
333 mode = S_IRUSR | S_IWUSR | S_IWGRP;
334 gid = gr->gr_gid;
335 }
336 else
337#endif /* TTY_GID_SUPPORT */
338 {
339 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
340 gid = 0;
341 }
342 }
343} ttyconf;
344
345ptytty_unix::ptytty_unix ()
346{
347 name = 0;
348#if UTMP_SUPPORT
349 cmd_pid = 0;
350#endif
351}
352
353ptytty_unix::~ptytty_unix ()
354{
355#if UTMP_SUPPORT
356 logout ();
357#endif
358 put ();
359}
360
361void
362ptytty_unix::put ()
363{
364 if (name)
365 {
366 chmod (name, RESTORE_TTY_MODE);
367 chown (name, 0, ttyconf.gid);
368 }
369
370 close_tty ();
371
372 if (pty >= 0)
373 close (pty);
374
375 free (name);
376
377 pty = tty = -1;
378 name = 0;
379}
380
381bool
382ptytty_unix::get ()
383{
384 /* get master (pty) */
385 if ((pty = get_pty (&tty, &name)) < 0)
386 return false;
387
388 fcntl (pty, F_SETFL, O_NONBLOCK);
389
390 /* get slave (tty) */
391 if (tty < 0)
392 {
393#ifndef NO_SETOWNER_TTYDEV
394 chown (name, getuid (), ttyconf.gid); /* fail silently */
395 chmod (name, ttyconf.mode);
396# ifdef HAVE_REVOKE
397 revoke (name);
278# endif 398# endif
279/* ---------------------------------------- */ 399#endif
280 fd = open("/dev/tty", O_WRONLY); 400
281 D_TTY((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)")); 401 if ((tty = get_tty (name)) < 0)
282 if (fd < 0) 402 {
283 return -1; /* fatal */ 403 put ();
284 close(fd); 404 return false;
285/* ---------------------------------------- */ 405 }
286 D_TTY((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp())); 406 }
287/* ---------------------------------------- */ 407
288#endif /* ! __QNX__ */ 408 return true;
289 return 0;
290} 409}
291/*----------------------- end-of-file (C source) -----------------------*/ 410

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