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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.5 by pcg, Sat Jan 31 03:27:45 2004 UTC vs.
Revision 1.64 by ayin, Tue Jun 26 00:40:28 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 * 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#include <stdio.h>
30#ifdef HAVE_STDLIB_H
31# include <stdlib.h> 32#include <cstdlib>
32#endif 33#include <cstring>
33#ifdef HAVE_SYS_TYPES_H 34#include <csignal>
35
34# include <sys/types.h> 36#include <sys/types.h>
35#endif
36#ifdef HAVE_UNISTD_H
37# include <unistd.h> 37#include <unistd.h>
38#endif
39#if defined(HAVE_STRING_H)
40# include <string.h>
41#endif
42#ifdef HAVE_FCNTL_H
43# include <fcntl.h> 38#include <fcntl.h>
44#endif 39
45#ifdef HAVE_SYS_IOCTL_H 40#ifdef HAVE_SYS_IOCTL_H
46# include <sys/ioctl.h> 41# include <sys/ioctl.h>
47#endif 42#endif
48#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 43#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
49# include <sys/stropts.h> /* for I_PUSH */ 44# include <sys/stropts.h> /* for I_PUSH */
50#endif 45#endif
51 46#ifdef HAVE_ISASTREAM
52#ifdef DEBUG_TTY 47# include <stropts.h>
53# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
54#else
55# define D_TTY(x)
56#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/////////////////////////////////////////////////////////////////////////////
57 63
58/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
59 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
60 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
61/* 67/*
62 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
63 * 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.
64 * 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
65 */ 71 */
66/* EXTPROTO */ 72#if defined(UNIX98_PTY)
67int 73
74 static int
68rxvt_get_pty(int *fd_tty, const char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
69{ 76 {
70 int pfd; 77 int pfd;
71 78
72#ifdef PTYS_ARE_OPENPTY 79# if defined(HAVE_GETPT)
73 80 pfd = getpt();
74 char tty_name[sizeof "/dev/pts/????\0"]; 81# elif defined(HAVE_POSIX_OPENPT)
75 82 pfd = posix_openpt (O_RDWR);
76 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) 83# else
77 { 84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
78 *ttydev = strdup(tty_name);
79 return pfd;
80 }
81#endif 85# endif
82 86
83#ifdef PTYS_ARE__GETPTY 87 if (pfd >= 0)
84 *ttydev = _getpty(&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
85 if (*ttydev != NULL)
86 return pfd;
87#endif
88
89#ifdef PTYS_ARE_GETPTY
90
91 char *ptydev;
92
93 while ((ptydev = getpty()) != NULL)
94 if ((pfd = open(ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
95 { 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 {
96 *ttydev = ptydev; 115 *ttydev = strdup (tty_name);
97 return pfd; 116 return pfd;
98 } 117 }
99#endif
100 118
101#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) 119 return -1;
102# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) 120 }
103 121
104 { 122#elif defined(HAVE__GETPTY)
105# ifdef PTYS_ARE_GETPT
106 pfd = getpt();
107# else
108 123
124 static int
125 get_pty (int *fd_tty, char **ttydev)
126 {
127 int pfd;
128
129 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
130
131 if (*ttydev != NULL)
132 return pfd;
133
134 return -1;
135 }
136
137#elif defined(HAVE_DEV_PTC)
138
139 static int
140 get_pty (int *fd_tty, char **ttydev)
141 {
142 int pfd;
143
109 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 144 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
110# endif
111
112 if (pfd >= 0)
113 { 145 {
114 if (grantpt(pfd) == 0 /* change slave permissions */ 146 *ttydev = strdup (ttyname (pfd));
115 && unlockpt(pfd) == 0) 147 return pfd;
116 { /* slave now unlocked */ 148 }
117 *ttydev = ptsname(pfd); /* get slave's name */ 149
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
160 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
161 {
162 *ttydev = strdup (ptsname (pfd));
163 return pfd;
164 }
165
166 return -1;
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
182 for (i = 0; i < 256; i++)
183 {
184 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
185 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
186
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
195 if (access (tty_name, R_OK | W_OK) == 0)
196 {
197 *ttydev = strdup (tty_name);
118 return pfd; 198 return pfd;
119 } 199 }
200
120 close(pfd); 201 close (pfd);
121 } 202 }
122 }
123# endif
124#endif
125 203
126#ifdef PTYS_ARE_PTC
127 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
128 {
129 *ttydev = ttyname(pfd);
130 return pfd;
131 }
132#endif
133
134#ifdef PTYS_ARE_CLONE
135 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
136 {
137 *ttydev = ptsname(pfd);
138 return pfd;
139 }
140#endif
141
142#ifdef PTYS_ARE_NUMERIC
143 {
144 int idx;
145 char *c1, *c2;
146 char pty_name[] = "/dev/ptyp???";
147 char tty_name[] = "/dev/ttyp???";
148
149 c1 = &(pty_name[sizeof(pty_name) - 4]);
150 c2 = &(tty_name[sizeof(tty_name) - 4]);
151 for (idx = 0; idx < 256; idx++)
152 {
153 sprintf(c1, "%d", idx);
154 sprintf(c2, "%d", idx);
155 if (access(tty_name, F_OK) < 0)
156 {
157 idx = 256;
158 break;
159 }
160 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
161 {
162 if (access(tty_name, R_OK | W_OK) == 0)
163 {
164 *ttydev = strdup(tty_name);
165 return pfd;
166 }
167 close(pfd);
168 }
169 }
170 }
171#endif
172#ifdef PTYS_ARE_SEARCHED
173 {
174 const char *c1, *c2;
175 char pty_name[] = "/dev/pty??";
176 char tty_name[] = "/dev/tty??";
177
178# ifndef PTYCHAR1
179# define PTYCHAR1 "pqrstuvwxyz"
180# endif
181# ifndef PTYCHAR2
182# define PTYCHAR2 "0123456789abcdef"
183# endif
184
185 for (c1 = PTYCHAR1; *c1; c1++)
186 {
187 pty_name[(sizeof(pty_name) - 3)] =
188 tty_name[(sizeof(pty_name) - 3)] = *c1;
189 for (c2 = PTYCHAR2; *c2; c2++)
190 {
191 pty_name[(sizeof(pty_name) - 2)] =
192 tty_name[(sizeof(pty_name) - 2)] = *c2;
193 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
194 {
195 if (access(tty_name, R_OK | W_OK) == 0)
196 {
197 *ttydev = strdup(tty_name);
198 return pfd;
199 }
200 close(pfd);
201 }
202 }
203 }
204 }
205#endif
206 return -1; 204 return -1;
207} 205 }
206
207#endif
208 208
209/*----------------------------------------------------------------------*/ 209/*----------------------------------------------------------------------*/
210/* 210/*
211 * Returns tty file descriptor, or -1 on failure 211 * Returns tty file descriptor, or -1 on failure
212 */ 212 */
213/* EXTPROTO */ 213static int
214int
215rxvt_get_tty (const char *ttydev) 214get_tty (char *ttydev)
216{ 215{
217 return open (ttydev, O_RDWR | O_NOCTTY, 0); 216 return open (ttydev, O_RDWR | O_NOCTTY, 0);
218} 217}
219 218
220/*----------------------------------------------------------------------*/ 219/*----------------------------------------------------------------------*/
221/* 220/*
222 * 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
223 */ 222 */
224/* EXTPROTO */ 223static int
225int 224control_tty (int fd_tty)
226rxvt_control_tty (int fd_tty, const char *ttydev)
227{ 225{
228#ifndef __QNX__
229 int fd;
230
231 D_TTY ((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
232 /* ---------------------------------------- */
233# ifdef HAVE_SETSID
234 setsid (); 226 setsid ();
235# endif
236# if defined(HAVE_SETPGID)
237 setpgid (0, 0);
238# elif defined(HAVE_SETPGRP)
239 setpgrp (0, 0);
240# endif
241 /* ---------------------------------------- */
242# ifdef TIOCNOTTY
243 227
244 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
245 D_TTY ((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
246 if (fd >= 0)
247 {
248 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
249 close (fd);
250 }
251# endif
252 /* ---------------------------------------- */
253 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
254 D_TTY ((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
255 if (fd >= 0)
256 close (fd); /* ouch: still have controlling tty */
257 /* ---------------------------------------- */
258#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 228#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
259 /* 229 /*
260 * Push STREAMS modules: 230 * Push STREAMS modules:
261 * ptem: pseudo-terminal hardware emulation module. 231 * ptem: pseudo-terminal hardware emulation module.
262 * ldterm: standard terminal line discipline. 232 * ldterm: standard terminal line discipline.
263 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 233 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
264 * 234 *
265 * After we push the STREAMS modules, the first open() on the slave side 235 * After we push the STREAMS modules, the first open () on the slave side
266 * (i.e. the next section between the dashes giving us "tty opened OK") 236 * (i.e. the next section between the dashes giving us "tty opened OK")
267 * should make the "ptem" (or "ldterm" depending upon either which OS 237 * should make the "ptem" (or "ldterm" depending upon either which OS
268 * version or which set of manual pages you have) module give us a 238 * version or which set of manual pages you have) module give us a
269 * controlling terminal. We must already have close()d the master side 239 * controlling terminal. We must already have close ()d the master side
270 * fd in this child process before we push STREAMS modules on because the 240 * fd in this child process before we push STREAMS modules on because the
271 * documentation is really unclear about whether it is any close() on 241 * documentation is really unclear about whether it is any close () on
272 * the master side or the last close() - i.e. a proper STREAMS dismantling 242 * the master side or the last close () - i.e. a proper STREAMS dismantling
273 * close() - on the master side which causes a hang up to be sent 243 * close () - on the master side which causes a hang up to be sent
274 * through - Geoff Wing 244 * through - Geoff Wing
275 */ 245 */
276# ifdef HAVE_ISASTREAM 246# ifdef HAVE_ISASTREAM
277 if (isastream (fd_tty) == 1) 247 if (isastream (fd_tty) == 1)
278# endif 248# endif
279 { 249 {
280 D_TTY ((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
281 ioctl (fd_tty, I_PUSH, "ptem"); 250 ioctl (fd_tty, I_PUSH, "ptem");
282 ioctl (fd_tty, I_PUSH, "ldterm"); 251 ioctl (fd_tty, I_PUSH, "ldterm");
283 ioctl (fd_tty, I_PUSH, "ttcompat"); 252 ioctl (fd_tty, I_PUSH, "ttcompat");
284 } 253 }
285#endif 254#endif
286 /* ---------------------------------------- */ 255
287# if defined(TIOCSCTTY) 256#ifdef TIOCSCTTY
288 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 257 ioctl (fd_tty, TIOCSCTTY, NULL);
289 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
290# elif defined(TIOCSETCTTY)
291 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
292 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
293# else 258#else
294 fd = open (ttydev, O_RDWR); 259 fd = open (name, O_RDWR);
295 D_TTY ((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
296 if (fd >= 0) 260 if (fd >= 0)
297 close(fd); 261 close (fd);
262#endif
263
264 int fd = open ("/dev/tty", O_WRONLY);
265 if (fd < 0)
266 return -1; /* fatal */
267
268 close (fd);
269
270 return 0;
271}
272
273void
274ptytty::close_tty ()
275{
276 if (tty < 0)
277 return;
278
279 close (tty);
280 tty = -1;
281}
282
283bool
284ptytty::make_controlling_tty ()
285{
286 return control_tty (tty) >= 0;
287}
288
289void
290ptytty::set_utf8_mode (bool on)
291{
292#ifdef IUTF8
293 if (pty < 0)
294 return;
295
296 struct termios tio;
297
298 if (tcgetattr (pty, &tio) != -1)
299 {
300 tcflag_t new_cflag = tio.c_iflag;
301
302 if (on)
303 new_cflag |= IUTF8;
304 else
305 new_cflag &= ~IUTF8;
306
307 if (new_cflag != tio.c_iflag)
308 {
309 tio.c_iflag = new_cflag;
310 tcsetattr (pty, TCSANOW, &tio);
311 }
312 }
313#endif
314}
315
316static struct ttyconf {
317 gid_t gid;
318 mode_t mode;
319
320 ttyconf ()
321 {
322#ifdef TTY_GID_SUPPORT
323 struct group *gr = getgrnam ("tty");
324
325 if (gr)
326 { /* change group ownership of tty to "tty" */
327 mode = S_IRUSR | S_IWUSR | S_IWGRP;
328 gid = gr->gr_gid;
329 }
330 else
331#endif /* TTY_GID_SUPPORT */
332 {
333 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
334 gid = 0;
335 }
336 }
337} ttyconf;
338
339ptytty_unix::ptytty_unix ()
340{
341 name = 0;
342#if UTMP_SUPPORT
343 cmd_pid = 0;
344#endif
345}
346
347ptytty_unix::~ptytty_unix ()
348{
349#if UTMP_SUPPORT
350 logout ();
351#endif
352 put ();
353}
354
355void
356ptytty_unix::put ()
357{
358 if (name)
359 {
360 chmod (name, RESTORE_TTY_MODE);
361 chown (name, 0, ttyconf.gid);
362 }
363
364 close_tty ();
365
366 if (pty >= 0)
367 close (pty);
368
369 free (name);
370
371 pty = tty = -1;
372 name = 0;
373}
374
375bool
376ptytty_unix::get ()
377{
378 /* get master (pty) */
379 if ((pty = get_pty (&tty, &name)) < 0)
380 return false;
381
382 fcntl (pty, F_SETFL, O_NONBLOCK);
383
384 /* get slave (tty) */
385 if (tty < 0)
386 {
387#ifndef NO_SETOWNER_TTYDEV
388 chown (name, getuid (), ttyconf.gid); /* fail silently */
389 chmod (name, ttyconf.mode);
390# ifdef HAVE_REVOKE
391 revoke (name);
298# endif 392# endif
299 /* ---------------------------------------- */ 393#endif
300 fd = open ("/dev/tty", O_WRONLY);
301 D_TTY ((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
302 if (fd < 0)
303 return -1; /* fatal */
304 close (fd);
305 /* ---------------------------------------- */
306 D_TTY ((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
307 /* ---------------------------------------- */
308#endif /* ! __QNX__ */
309 394
395 if ((tty = get_tty (name)) < 0)
396 {
397 put ();
398 return false;
399 }
400 }
401
310 return 0; 402 return true;
311} 403}
312/*----------------------- end-of-file (C source) -----------------------*/ 404

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