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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.3 by pcg, Tue Nov 25 15:25:17 2003 UTC vs.
Revision 1.63 by root, Tue Oct 3 11:21:33 2006 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 1.3 2003/11/25 15:25:17 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{ 76 {
72 int pfd; 77 int pfd;
73 78
74#ifdef PTYS_ARE_OPENPTY 79# if defined(HAVE_GETPT)
75 char tty_name[sizeof "/dev/pts/????\0"]; 80 pfd = getpt();
76 81# elif defined(HAVE_POSIX_OPENPT)
77 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) { 82 pfd = posix_openpt (O_RDWR);
78 *ttydev = strdup(tty_name); 83# else
79 return pfd; 84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
80 }
81#endif 85# endif
82 86
83#ifdef PTYS_ARE__GETPTY 87 if (pfd >= 0)
88 {
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 char tty_name[32];
110
111 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
112
113 if (res != -1)
114 {
115 *ttydev = strdup (tty_name);
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
84 *ttydev = _getpty(&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 129 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
130
85 if (*ttydev != NULL) 131 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; 132 return pfd;
96 }
97#endif
98 133
99#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) 134 return -1;
100# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
101 {
102# ifdef PTYS_ARE_GETPT
103 pfd = getpt();
104# else
105 pfd = open("/dev/ptmx", 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 } 135 }
116# endif
117#endif
118 136
119#ifdef PTYS_ARE_PTC 137#elif defined(HAVE_DEV_PTC)
138
139 static int
140 get_pty (int *fd_tty, char **ttydev)
141 {
142 int pfd;
143
120 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) { 144 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
121 *ttydev = ttyname(pfd); 145 {
122 return pfd; 146 *ttydev = strdup (ttyname (pfd));
147 return pfd;
123 } 148 }
124#endif
125 149
126#ifdef PTYS_ARE_CLONE 150 return -1;
151 }
152
153#elif defined(HAVE_DEV_CLONE)
154
155 static int
156 get_pty (int *fd_tty, char **ttydev)
157 {
158 int pfd;
159
127 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) { 160 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 { 161 {
135 int idx; 162 *ttydev = strdup (ptsname (pfd));
136 char *c1, *c2; 163 return pfd;
137 char pty_name[] = "/dev/ptyp???"; 164 }
138 char tty_name[] = "/dev/ttyp???";
139 165
140 c1 = &(pty_name[sizeof(pty_name) - 4]); 166 return -1;
141 c2 = &(tty_name[sizeof(tty_name) - 4]); 167 }
168
169#else
170
171 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
172 static int
173 get_pty (int *fd_tty, char **ttydev)
174 {
175 int pfd;
176 int i;
177 char pty_name[32];
178 char tty_name[32];
179 const char *majors = "pqrstuvwxyzabcde";
180 const char *minors = "0123456789abcdef";
181
142 for (idx = 0; idx < 256; idx++) { 182 for (i = 0; i < 256; i++)
143 sprintf(c1, "%d", idx); 183 {
144 sprintf(c2, "%d", idx); 184 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
145 if (access(tty_name, F_OK) < 0) { 185 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
146 idx = 256; 186
147 break;
148 }
149 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) { 187 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
188 {
189 snprintf(pty_name, 32, "/dev/ptyp%d", i);
190 snprintf(tty_name, 32, "/dev/ttyp%d", i);
191 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
192 continue;
193 }
194
150 if (access(tty_name, R_OK | W_OK) == 0) { 195 if (access (tty_name, R_OK | W_OK) == 0)
196 {
151 *ttydev = strdup(tty_name); 197 *ttydev = strdup (tty_name);
152 return pfd; 198 return pfd;
153 } 199 }
154 close(pfd); 200
155 } 201 close (pfd);
156 }
157 } 202 }
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??";
164 203
165# ifndef PTYCHAR1 204 return -1;
166# define PTYCHAR1 "pqrstuvwxyz" 205 }
206
167# endif 207#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}
190 208
191/*----------------------------------------------------------------------*/ 209/*----------------------------------------------------------------------*/
192/* 210/*
193 * Returns tty file descriptor, or -1 on failure 211 * Returns tty file descriptor, or -1 on failure
194 */ 212 */
195/* EXTPROTO */ 213static int
196int
197rxvt_get_tty(const char *ttydev) 214get_tty (char *ttydev)
198{ 215{
199 return open(ttydev, O_RDWR | O_NOCTTY, 0); 216 return open (ttydev, O_RDWR | O_NOCTTY, 0);
200} 217}
201 218
202/*----------------------------------------------------------------------*/ 219/*----------------------------------------------------------------------*/
203/* 220/*
204 * Make our tty a controlling tty so that /dev/tty points to us 221 * Make our tty a controlling tty so that /dev/tty points to us
205 */ 222 */
206/* EXTPROTO */ 223static int
207int 224control_tty (int fd_tty)
208rxvt_control_tty(int fd_tty, const char *ttydev)
209{ 225{
210#ifndef __QNX__
211 int fd;
212
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(); 226 setsid ();
227
228#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
229 /*
230 * Push STREAMS modules:
231 * ptem: pseudo-terminal hardware emulation module.
232 * ldterm: standard terminal line discipline.
233 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
234 *
235 * After we push the STREAMS modules, the first open () on the slave side
236 * (i.e. the next section between the dashes giving us "tty opened OK")
237 * should make the "ptem" (or "ldterm" depending upon either which OS
238 * version or which set of manual pages you have) module give us a
239 * controlling terminal. We must already have close ()d the master side
240 * fd in this child process before we push STREAMS modules on because the
241 * documentation is really unclear about whether it is any close () on
242 * the master side or the last close () - i.e. a proper STREAMS dismantling
243 * close () - on the master side which causes a hang up to be sent
244 * through - Geoff Wing
245 */
246# ifdef HAVE_ISASTREAM
247 if (isastream (fd_tty) == 1)
217# endif 248# endif
218# if defined(HAVE_SETPGID) 249 {
219 setpgid(0, 0); 250 ioctl (fd_tty, I_PUSH, "ptem");
220# elif defined(HAVE_SETPGRP) 251 ioctl (fd_tty, I_PUSH, "ldterm");
221 setpgrp(0, 0); 252 ioctl (fd_tty, I_PUSH, "ttcompat");
253 }
254#endif
255
256 ioctl (fd_tty, TIOCSCTTY, NULL);
257
258 int fd = open ("/dev/tty", O_WRONLY);
259 if (fd < 0)
260 return -1; /* fatal */
261
262 close (fd);
263
264 return 0;
265}
266
267void
268ptytty::close_tty ()
269{
270 if (tty < 0)
271 return;
272
273 close (tty);
274 tty = -1;
275}
276
277bool
278ptytty::make_controlling_tty ()
279{
280 return control_tty (tty) >= 0;
281}
282
283void
284ptytty::set_utf8_mode (bool on)
285{
286#ifdef IUTF8
287 if (pty < 0)
288 return;
289
290 struct termios tio;
291
292 if (tcgetattr (pty, &tio) != -1)
293 {
294 tcflag_t new_cflag = tio.c_iflag;
295
296 if (on)
297 new_cflag |= IUTF8;
298 else
299 new_cflag &= ~IUTF8;
300
301 if (new_cflag != tio.c_iflag)
302 {
303 tio.c_iflag = new_cflag;
304 tcsetattr (pty, TCSANOW, &tio);
305 }
306 }
307#endif
308}
309
310static struct ttyconf {
311 gid_t gid;
312 mode_t mode;
313
314 ttyconf ()
315 {
316#ifdef TTY_GID_SUPPORT
317 struct group *gr = getgrnam ("tty");
318
319 if (gr)
320 { /* change group ownership of tty to "tty" */
321 mode = S_IRUSR | S_IWUSR | S_IWGRP;
322 gid = gr->gr_gid;
323 }
324 else
325#endif /* TTY_GID_SUPPORT */
326 {
327 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
328 gid = 0;
329 }
330 }
331} ttyconf;
332
333ptytty_unix::ptytty_unix ()
334{
335 name = 0;
336#if UTMP_SUPPORT
337 cmd_pid = 0;
338#endif
339}
340
341ptytty_unix::~ptytty_unix ()
342{
343#if UTMP_SUPPORT
344 logout ();
345#endif
346 put ();
347}
348
349void
350ptytty_unix::put ()
351{
352 if (name)
353 {
354 chmod (name, RESTORE_TTY_MODE);
355 chown (name, 0, ttyconf.gid);
356 }
357
358 close_tty ();
359
360 if (pty >= 0)
361 close (pty);
362
363 free (name);
364
365 pty = tty = -1;
366 name = 0;
367}
368
369bool
370ptytty_unix::get ()
371{
372 /* get master (pty) */
373 if ((pty = get_pty (&tty, &name)) < 0)
374 return false;
375
376 fcntl (pty, F_SETFL, O_NONBLOCK);
377
378 /* get slave (tty) */
379 if (tty < 0)
380 {
381#ifndef NO_SETOWNER_TTYDEV
382 chown (name, getuid (), ttyconf.gid); /* fail silently */
383 chmod (name, ttyconf.mode);
384# ifdef HAVE_REVOKE
385 revoke (name);
222# endif 386# 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 387#endif
232/* ---------------------------------------- */ 388
233 fd = open("/dev/tty", O_RDWR | O_NOCTTY); 389 if ((tty = get_tty (name)) < 0)
234 D_TTY((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)")); 390 {
235 if (fd >= 0) 391 put ();
236 close(fd); /* ouch: still have controlling tty */ 392 return false;
237/* ---------------------------------------- */ 393 }
238#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
239/*
240 * Push STREAMS modules:
241 * ptem: pseudo-terminal hardware emulation module.
242 * ldterm: standard terminal line discipline.
243 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
244 *
245 * 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")
247 * 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
249 * 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
251 * 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
253 * close() - on the master side which causes a hang up to be sent
254 * through - Geoff Wing
255 */
256# ifdef HAVE_ISASTREAM
257 if (isastream(fd_tty) == 1)
258# endif
259 { 394 }
260 D_TTY((stderr, "rxvt_control_tty(): Pushing STREAMS modules")); 395
261 ioctl(fd_tty, I_PUSH, "ptem"); 396 return true;
262 ioctl(fd_tty, I_PUSH, "ldterm");
263 ioctl(fd_tty, I_PUSH, "ttcompat");
264 }
265#endif
266/* ---------------------------------------- */
267# if defined(TIOCSCTTY)
268 fd = 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
274 fd = open(ttydev, O_RDWR);
275 D_TTY((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
276 if (fd >= 0)
277 close(fd);
278# endif
279/* ---------------------------------------- */
280 fd = open("/dev/tty", O_WRONLY);
281 D_TTY((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
282 if (fd < 0)
283 return -1; /* fatal */
284 close(fd);
285/* ---------------------------------------- */
286 D_TTY((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
287/* ---------------------------------------- */
288#endif /* ! __QNX__ */
289 return 0;
290} 397}
291/*----------------------- end-of-file (C source) -----------------------*/ 398

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