… | |
… | |
33 | #include <fcntl.h> |
33 | #include <fcntl.h> |
34 | |
34 | |
35 | #ifdef HAVE_SYS_IOCTL_H |
35 | #ifdef HAVE_SYS_IOCTL_H |
36 | # include <sys/ioctl.h> |
36 | # include <sys/ioctl.h> |
37 | #endif |
37 | #endif |
38 | #if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
38 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
39 | # include <sys/stropts.h> /* for I_PUSH */ |
39 | # include <sys/stropts.h> /* for I_PUSH */ |
40 | #endif |
40 | #endif |
41 | #ifdef HAVE_ISASTREAM |
41 | #ifdef HAVE_ISASTREAM |
42 | # include <stropts.h> |
42 | # include <stropts.h> |
43 | #endif |
43 | #endif |
… | |
… | |
46 | #elif defined(HAVE_LIBUTIL_H) |
46 | #elif defined(HAVE_LIBUTIL_H) |
47 | # include <libutil.h> |
47 | # include <libutil.h> |
48 | #elif defined(HAVE_UTIL_H) |
48 | #elif defined(HAVE_UTIL_H) |
49 | # include <util.h> |
49 | # include <util.h> |
50 | #endif |
50 | #endif |
|
|
51 | #ifdef TTY_GID_SUPPORT |
|
|
52 | #include <grp.h> |
|
|
53 | #endif |
51 | |
54 | |
52 | #include <cstdio> |
55 | #include <cstdio> |
53 | #include <grp.h> |
|
|
54 | |
56 | |
55 | #include "rxvtutil.h" |
57 | #include "rxvtutil.h" |
56 | #include "fdpass.h" |
58 | #include "fdpass.h" |
57 | #include "ptytty.h" |
59 | #include "ptytty.h" |
58 | |
60 | |
… | |
… | |
64 | /* |
66 | /* |
65 | * Returns pty file descriptor, or -1 on failure |
67 | * Returns pty file descriptor, or -1 on failure |
66 | * If successful, ttydev is set to the name of the slave device. |
68 | * If successful, ttydev is set to the name of the slave device. |
67 | * fd_tty _may_ also be set to an open fd to the slave device |
69 | * fd_tty _may_ also be set to an open fd to the slave device |
68 | */ |
70 | */ |
69 | static inline int |
71 | #if defined(UNIX98_PTY) |
|
|
72 | static int |
70 | get_pty_streams (int *fd_tty, char **ttydev) |
73 | get_pty (int *fd_tty, char **ttydev) |
71 | { |
74 | { |
72 | #ifdef NO_SETOWNER_TTYDEV |
|
|
73 | int pfd; |
75 | int pfd; |
74 | |
76 | |
75 | # ifdef PTYS_ARE_GETPT |
77 | # if defined(HAVE_GETPT) |
76 | pfd = getpt(); |
78 | pfd = getpt(); |
77 | # else |
79 | # elif defined(HAVE_POSIX_OPENPT) |
78 | # ifdef PTYS_ARE_POSIX |
|
|
79 | pfd = posix_openpt (O_RDWR); |
80 | pfd = posix_openpt (O_RDWR); |
80 | # else |
81 | # else |
81 | pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
82 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
82 | # endif |
|
|
83 | # endif |
83 | # endif |
84 | if (pfd >= 0) |
84 | if (pfd >= 0) |
85 | { |
85 | { |
86 | if (grantpt (pfd) == 0 /* change slave permissions */ |
86 | if (grantpt (pfd) == 0 /* change slave permissions */ |
87 | && unlockpt (pfd) == 0) |
87 | && unlockpt (pfd) == 0) |
88 | { /* slave now unlocked */ |
88 | { /* slave now unlocked */ |
89 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
89 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
90 | return pfd; |
90 | return pfd; |
91 | } |
91 | } |
|
|
92 | |
92 | close (pfd); |
93 | close (pfd); |
93 | } |
94 | } |
94 | #endif |
95 | |
95 | return -1; |
96 | return -1; |
96 | } |
97 | } |
97 | |
98 | #elif defined(HAVE_OPENPTY) |
98 | static inline int |
99 | static int |
99 | get_pty_openpty (int *fd_tty, char **ttydev) |
100 | get_pty (int *fd_tty, char **ttydev) |
100 | { |
101 | { |
101 | #ifdef PTYS_ARE_OPENPTY |
|
|
102 | int pfd; |
102 | int pfd; |
103 | int res; |
103 | int res; |
104 | char tty_name[sizeof "/dev/pts/????\0"]; |
104 | char tty_name[32]; |
105 | |
105 | |
106 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
106 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
107 | if (res != -1) |
107 | if (res != -1) |
108 | { |
108 | { |
109 | *ttydev = strdup (tty_name); |
109 | *ttydev = strdup (tty_name); |
110 | return pfd; |
110 | return pfd; |
111 | } |
111 | } |
112 | #endif |
112 | |
113 | return -1; |
113 | return -1; |
114 | } |
114 | } |
115 | |
115 | #elif defined(HAVE__GETPTY) |
116 | static inline int |
116 | static int |
117 | get_pty__getpty (int *fd_tty, char **ttydev) |
117 | get_pty (int *fd_tty, char **ttydev) |
118 | { |
118 | { |
119 | #ifdef PTYS_ARE__GETPTY |
|
|
120 | int pfd; |
119 | int pfd; |
121 | |
120 | |
122 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
121 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
123 | if (*ttydev != NULL) |
122 | if (*ttydev != NULL) |
124 | return pfd; |
123 | return pfd; |
125 | #endif |
124 | |
126 | return -1; |
125 | return -1; |
127 | } |
126 | } |
128 | |
127 | #elif defined(HAVE_DEV_PTC) |
129 | static inline int |
128 | static int |
130 | get_pty_ptc (int *fd_tty, char **ttydev) |
129 | get_pty (int *fd_tty, char **ttydev) |
131 | { |
130 | { |
132 | #ifdef PTYS_ARE_PTC |
|
|
133 | int pfd; |
131 | int pfd; |
134 | |
132 | |
135 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
133 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
136 | { |
134 | { |
137 | *ttydev = strdup (ttyname (pfd)); |
135 | *ttydev = strdup (ttyname (pfd)); |
138 | return pfd; |
136 | return pfd; |
139 | } |
137 | } |
140 | #endif |
138 | |
141 | return -1; |
139 | return -1; |
142 | } |
140 | } |
143 | |
141 | #elif defined(HAVE_DEV_CLONE) |
144 | static inline int |
142 | static int |
145 | get_pty_clone (int *fd_tty, char **ttydev) |
143 | get_pty (int *fd_tty, char **ttydev) |
146 | { |
144 | { |
147 | #ifdef PTYS_ARE_CLONE |
|
|
148 | int pfd; |
145 | int pfd; |
149 | |
146 | |
150 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
147 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
151 | { |
148 | { |
152 | *ttydev = strdup (ptsname (pfd)); |
149 | *ttydev = strdup (ptsname (pfd)); |
153 | return pfd; |
150 | return pfd; |
154 | } |
151 | } |
155 | #endif |
152 | |
156 | return -1; |
153 | return -1; |
157 | } |
154 | } |
158 | |
155 | #else |
159 | static inline int |
156 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
160 | get_pty_numeric (int *fd_tty, char **ttydev) |
|
|
161 | { |
|
|
162 | #ifdef PTYS_ARE_NUMERIC |
|
|
163 | int pfd; |
|
|
164 | int idx; |
|
|
165 | char *c1, *c2; |
|
|
166 | char pty_name[] = "/dev/ptyp???"; |
|
|
167 | char tty_name[] = "/dev/ttyp???"; |
|
|
168 | |
|
|
169 | c1 = &(pty_name[sizeof (pty_name) - 4]); |
|
|
170 | c2 = &(tty_name[sizeof (tty_name) - 4]); |
|
|
171 | for (idx = 0; idx < 256; idx++) |
|
|
172 | { |
|
|
173 | sprintf (c1, "%d", idx); |
|
|
174 | sprintf (c2, "%d", idx); |
|
|
175 | if (access (tty_name, F_OK) < 0) |
|
|
176 | { |
|
|
177 | idx = 256; |
|
|
178 | break; |
|
|
179 | } |
|
|
180 | |
|
|
181 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
|
|
182 | { |
|
|
183 | if (access (tty_name, R_OK | W_OK) == 0) |
|
|
184 | { |
|
|
185 | *ttydev = strdup (tty_name); |
|
|
186 | return pfd; |
|
|
187 | } |
|
|
188 | |
|
|
189 | close (pfd); |
|
|
190 | } |
|
|
191 | } |
|
|
192 | #endif |
|
|
193 | return -1; |
|
|
194 | } |
|
|
195 | |
|
|
196 | static inline int |
|
|
197 | get_pty_searched (int *fd_tty, char **ttydev) |
|
|
198 | { |
|
|
199 | #ifdef PTYS_ARE_SEARCHED |
|
|
200 | # ifndef PTYCHAR1 |
|
|
201 | # define PTYCHAR1 "pqrstuvwxyz" |
|
|
202 | # endif |
|
|
203 | # ifndef PTYCHAR2 |
|
|
204 | # define PTYCHAR2 "0123456789abcdef" |
|
|
205 | # endif |
|
|
206 | int pfd; |
|
|
207 | const char *c1, *c2; |
|
|
208 | char pty_name[] = "/dev/pty??"; |
|
|
209 | char tty_name[] = "/dev/tty??"; |
|
|
210 | |
|
|
211 | for (c1 = PTYCHAR1; *c1; c1++) |
|
|
212 | { |
|
|
213 | pty_name[ (sizeof (pty_name) - 3)] = |
|
|
214 | tty_name[ (sizeof (pty_name) - 3)] = *c1; |
|
|
215 | for (c2 = PTYCHAR2; *c2; c2++) |
|
|
216 | { |
|
|
217 | pty_name[ (sizeof (pty_name) - 2)] = |
|
|
218 | tty_name[ (sizeof (pty_name) - 2)] = *c2; |
|
|
219 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
|
|
220 | { |
|
|
221 | if (access (tty_name, R_OK | W_OK) == 0) |
|
|
222 | { |
|
|
223 | *ttydev = strdup (tty_name); |
|
|
224 | return pfd; |
|
|
225 | } |
|
|
226 | |
|
|
227 | close (pfd); |
|
|
228 | } |
|
|
229 | } |
|
|
230 | } |
|
|
231 | #endif |
|
|
232 | return -1; |
|
|
233 | } |
|
|
234 | |
|
|
235 | static int |
157 | static int |
236 | get_pty (int *fd_tty, char **ttydev) |
158 | get_pty (int *fd_tty, char **ttydev) |
237 | { |
159 | { |
238 | int pfd; |
160 | int pfd; |
239 | |
161 | int i; |
240 | if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1 |
162 | char pty_name[32]; |
241 | || (pfd = get_pty_openpty (fd_tty, ttydev)) != -1 |
163 | char tty_name[32]; |
242 | || (pfd = get_pty__getpty (fd_tty, ttydev)) != -1 |
164 | const char *majors = "pqrstuvwxyzabcde"; |
243 | || (pfd = get_pty_ptc (fd_tty, ttydev)) != -1 |
165 | const char *minors = "0123456789abcdef"; |
244 | || (pfd = get_pty_clone (fd_tty, ttydev)) != -1 |
166 | for (i = 0; i < 256; i++) |
245 | || (pfd = get_pty_numeric (fd_tty, ttydev)) != -1 |
167 | { |
246 | || (pfd = get_pty_searched (fd_tty, ttydev)) != -1) |
168 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
|
|
169 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
|
|
170 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
|
|
171 | { |
|
|
172 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
|
|
173 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
|
|
174 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
|
|
175 | continue; |
|
|
176 | } |
|
|
177 | if (access (tty_name, R_OK | W_OK) == 0) |
|
|
178 | { |
|
|
179 | *ttydev = strdup (tty_name); |
247 | return pfd; |
180 | return pfd; |
248 | return -1; |
181 | } |
|
|
182 | |
|
|
183 | close (pfd); |
|
|
184 | } |
249 | } |
185 | } |
|
|
186 | #endif |
250 | |
187 | |
251 | /*----------------------------------------------------------------------*/ |
188 | /*----------------------------------------------------------------------*/ |
252 | /* |
189 | /* |
253 | * Returns tty file descriptor, or -1 on failure |
190 | * Returns tty file descriptor, or -1 on failure |
254 | */ |
191 | */ |
… | |
… | |
263 | * Make our tty a controlling tty so that /dev/tty points to us |
200 | * Make our tty a controlling tty so that /dev/tty points to us |
264 | */ |
201 | */ |
265 | static int |
202 | static int |
266 | control_tty (int fd_tty) |
203 | control_tty (int fd_tty) |
267 | { |
204 | { |
268 | int fd; |
|
|
269 | |
|
|
270 | /* ---------------------------------------- */ |
|
|
271 | setsid (); |
205 | setsid (); |
272 | |
206 | |
273 | /* ---------------------------------------- */ |
|
|
274 | # if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
207 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
275 | /* |
208 | /* |
276 | * Push STREAMS modules: |
209 | * Push STREAMS modules: |
277 | * ptem: pseudo-terminal hardware emulation module. |
210 | * ptem: pseudo-terminal hardware emulation module. |
278 | * ldterm: standard terminal line discipline. |
211 | * ldterm: standard terminal line discipline. |
279 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
212 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
… | |
… | |
287 | * documentation is really unclear about whether it is any close () on |
220 | * documentation is really unclear about whether it is any close () on |
288 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
221 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
289 | * close () - on the master side which causes a hang up to be sent |
222 | * close () - on the master side which causes a hang up to be sent |
290 | * through - Geoff Wing |
223 | * through - Geoff Wing |
291 | */ |
224 | */ |
292 | # ifdef HAVE_ISASTREAM |
225 | # ifdef HAVE_ISASTREAM |
293 | if (isastream (fd_tty) == 1) |
226 | if (isastream (fd_tty) == 1) |
294 | # endif |
227 | # endif |
295 | { |
228 | { |
296 | ioctl (fd_tty, I_PUSH, "ptem"); |
229 | ioctl (fd_tty, I_PUSH, "ptem"); |
297 | ioctl (fd_tty, I_PUSH, "ldterm"); |
230 | ioctl (fd_tty, I_PUSH, "ldterm"); |
298 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
231 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
299 | } |
232 | } |
300 | # endif |
233 | #endif |
301 | /* ---------------------------------------- */ |
234 | |
302 | fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
235 | ioctl (fd_tty, TIOCSCTTY, NULL); |
303 | /* ---------------------------------------- */ |
236 | |
304 | fd = open ("/dev/tty", O_WRONLY); |
237 | int fd = open ("/dev/tty", O_WRONLY); |
305 | if (fd < 0) |
238 | if (fd < 0) |
306 | return -1; /* fatal */ |
239 | return -1; /* fatal */ |
|
|
240 | |
307 | close (fd); |
241 | close (fd); |
308 | /* ---------------------------------------- */ |
|
|
309 | |
242 | |
310 | return 0; |
243 | return 0; |
311 | } |
244 | } |
312 | |
245 | |
313 | void |
246 | void |
… | |
… | |
351 | } |
284 | } |
352 | } |
285 | } |
353 | #endif |
286 | #endif |
354 | } |
287 | } |
355 | |
288 | |
356 | ///////////////////////////////////////////////////////////////////////////// |
|
|
357 | |
|
|
358 | #ifndef NO_SETOWNER_TTYDEV |
|
|
359 | static struct ttyconf { |
289 | static struct ttyconf { |
360 | gid_t gid; |
290 | gid_t gid; |
361 | mode_t mode; |
291 | mode_t mode; |
362 | |
292 | |
363 | ttyconf () |
293 | ttyconf () |
… | |
… | |
372 | } |
302 | } |
373 | else |
303 | else |
374 | #endif /* TTY_GID_SUPPORT */ |
304 | #endif /* TTY_GID_SUPPORT */ |
375 | { |
305 | { |
376 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
306 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
377 | gid = getgid (); |
307 | gid = 0; |
378 | } |
308 | } |
379 | } |
309 | } |
380 | } ttyconf; |
310 | } ttyconf; |
381 | |
311 | |
382 | ///////////////////////////////////////////////////////////////////////////// |
|
|
383 | |
|
|
384 | void |
|
|
385 | rxvt_ptytty_unix::privileges (rxvt_privaction action) |
|
|
386 | { |
|
|
387 | if (!name || !*name) |
|
|
388 | return; |
|
|
389 | |
|
|
390 | if (action == SAVE) |
|
|
391 | { |
|
|
392 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
393 | /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
|
|
394 | if (lstat (name, &savestat) < 0) /* you lose out */ |
|
|
395 | ; |
|
|
396 | else |
|
|
397 | # endif |
|
|
398 | { |
|
|
399 | saved = true; |
|
|
400 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
401 | chmod (name, ttyconf.mode); |
|
|
402 | # ifdef HAVE_REVOKE |
|
|
403 | revoke (name); |
|
|
404 | # endif |
|
|
405 | } |
|
|
406 | } |
|
|
407 | else |
|
|
408 | { /* action == RESTORE */ |
|
|
409 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
410 | if (saved) |
|
|
411 | { |
|
|
412 | chmod (name, savestat.st_mode); |
|
|
413 | chown (name, savestat.st_uid, savestat.st_gid); |
|
|
414 | } |
|
|
415 | # else |
|
|
416 | chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
|
|
417 | chown (name, 0, 0); |
|
|
418 | # endif |
|
|
419 | |
|
|
420 | } |
|
|
421 | } |
|
|
422 | #endif |
|
|
423 | |
|
|
424 | rxvt_ptytty_unix::rxvt_ptytty_unix () |
312 | rxvt_ptytty_unix::rxvt_ptytty_unix () |
425 | { |
313 | { |
426 | pty = tty = -1; |
|
|
427 | name = 0; |
314 | name = 0; |
428 | #ifndef NO_SETOWNER_TTYDEV |
|
|
429 | saved = false; |
|
|
430 | #endif |
|
|
431 | #if UTMP_SUPPORT |
315 | #if UTMP_SUPPORT |
432 | cmd_pid = 0; |
316 | cmd_pid = 0; |
433 | #endif |
317 | #endif |
434 | } |
318 | } |
435 | |
319 | |
… | |
… | |
442 | } |
326 | } |
443 | |
327 | |
444 | void |
328 | void |
445 | rxvt_ptytty_unix::put () |
329 | rxvt_ptytty_unix::put () |
446 | { |
330 | { |
447 | #ifndef NO_SETOWNER_TTYDEV |
331 | chmod (name, RESTORE_TTY_MODE); |
448 | privileges (RESTORE); |
332 | chown (name, 0, ttyconf.gid); |
449 | #endif |
|
|
450 | |
333 | |
451 | if (pty >= 0) close (pty); |
|
|
452 | close_tty (); |
334 | close_tty (); |
|
|
335 | |
|
|
336 | if (pty >= 0) |
|
|
337 | close (pty); |
|
|
338 | |
453 | free (name); |
339 | free (name); |
454 | |
340 | |
455 | pty = tty = -1; |
341 | pty = tty = -1; |
456 | name = 0; |
342 | name = 0; |
457 | } |
343 | } |
… | |
… | |
467 | |
353 | |
468 | /* get slave (tty) */ |
354 | /* get slave (tty) */ |
469 | if (tty < 0) |
355 | if (tty < 0) |
470 | { |
356 | { |
471 | #ifndef NO_SETOWNER_TTYDEV |
357 | #ifndef NO_SETOWNER_TTYDEV |
472 | privileges (SAVE); |
358 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
359 | chmod (name, ttyconf.mode); |
|
|
360 | # ifdef HAVE_REVOKE |
|
|
361 | revoke (name); |
|
|
362 | # endif |
473 | #endif |
363 | #endif |
474 | |
364 | |
475 | if ((tty = get_tty (name)) < 0) |
365 | if ((tty = get_tty (name)) < 0) |
476 | { |
366 | { |
477 | put (); |
367 | put (); |
… | |
… | |
630 | close (sv[1]); |
520 | close (sv[1]); |
631 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
521 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
632 | } |
522 | } |
633 | else |
523 | else |
634 | { |
524 | { |
635 | setgid (getegid ()); |
|
|
636 | setuid (geteuid ()); |
|
|
637 | |
|
|
638 | // server, pty-helper |
525 | // server, pty-helper |
639 | sock_fd = sv[1]; |
526 | sock_fd = sv[1]; |
640 | |
527 | |
641 | for (int fd = 0; fd < 1023; fd++) |
528 | for (int fd = 0; fd < 1023; fd++) |
642 | if (fd != sock_fd && fd != 1) |
529 | if (fd != sock_fd) |
643 | close (fd); |
530 | close (fd); |
644 | |
531 | |
645 | serve (); |
532 | serve (); |
646 | _exit (EXIT_SUCCESS); |
533 | _exit (EXIT_SUCCESS); |
647 | } |
534 | } |
648 | } |
535 | } |
|
|
536 | |
649 | #endif |
537 | #endif |
650 | |
538 | |
651 | // a "factory" *g* |
539 | // a "factory" *g* |
652 | rxvt_ptytty * |
540 | rxvt_ptytty * |
653 | rxvt_new_ptytty () |
541 | rxvt_new_ptytty () |