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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
23: /*
24: * Copyright (c) 1982, 1986, 1989, 1993
25: * The Regents of the University of California. All rights reserved.
26: *
27: * Redistribution and use in source and binary forms, with or without
28: * modification, are permitted provided that the following conditions
29: * are met:
30: * 1. Redistributions of source code must retain the above copyright
31: * notice, this list of conditions and the following disclaimer.
32: * 2. Redistributions in binary form must reproduce the above copyright
33: * notice, this list of conditions and the following disclaimer in the
34: * documentation and/or other materials provided with the distribution.
35: * 3. All advertising materials mentioning features or use of this software
36: * must display the following acknowledgement:
37: * This product includes software developed by the University of
38: * California, Berkeley and its contributors.
39: * 4. Neither the name of the University nor the names of its contributors
40: * may be used to endorse or promote products derived from this software
41: * without specific prior written permission.
42: *
43: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53: * SUCH DAMAGE.
54: *
55: * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
56: */
57:
58: /*
59: * Pseudo-teletype Driver
60: * (Actually two drivers, requiring two entries in 'cdevsw')
61: */
62: #include "pty.h" /* XXX */
63:
64: #include <sys/param.h>
65: #include <sys/systm.h>
66: #include <sys/ioctl.h>
67: #include <sys/proc.h>
68: #include <sys/tty.h>
69: #include <sys/conf.h>
70: #include <sys/file.h>
71: #include <sys/uio.h>
72: #include <sys/kernel.h>
73: #include <sys/vnode.h>
74: #include <sys/signalvar.h>
75:
76: #ifndef NeXT
77:
78: #define FREE_BSDSTATIC static
79: #else
80: #include <machine/spl.h>
81:
82: #define FREE_BSDSTATIC __private_extern__
83: #define d_open_t open_close_fcn_t
84: #define d_close_t open_close_fcn_t
85: #define d_devtotty_t struct tty **
86: #define d_ioctl_t ioctl_fcn_t
87: #define d_read_t read_write_fcn_t
88: #define d_write_t read_write_fcn_t
89: #define d_select_t select_fcn_t
90: typedef void d_stop_t __P((struct tty *tp, int rw));
91: #endif /* NeXT */
92:
93: #ifdef notyet
94: static void ptyattach __P((int n));
95: #endif
96: static void ptsstart __P((struct tty *tp));
97: static void ptcwakeup __P((struct tty *tp, int flag));
98:
99: FREE_BSDSTATIC d_open_t ptsopen;
100: FREE_BSDSTATIC d_close_t ptsclose;
101: FREE_BSDSTATIC d_read_t ptsread;
102: FREE_BSDSTATIC d_write_t ptswrite;
103: FREE_BSDSTATIC d_ioctl_t ptyioctl;
104: FREE_BSDSTATIC d_stop_t ptsstop;
105: FREE_BSDSTATIC d_devtotty_t ptydevtotty;
106: FREE_BSDSTATIC d_open_t ptcopen;
107: FREE_BSDSTATIC d_close_t ptcclose;
108: FREE_BSDSTATIC d_read_t ptcread;
109: FREE_BSDSTATIC d_write_t ptcwrite;
110: FREE_BSDSTATIC d_select_t ptcselect;
111:
112: #ifndef NeXT
113: #define CDEV_MAJOR_S 5
114: #define CDEV_MAJOR_C 6
115: static struct cdevsw pts_cdevsw =
116: { ptsopen, ptsclose, ptsread, ptswrite, /*5*/
117: ptyioctl, ptsstop, nullreset, ptydevtotty,/* ttyp */
118: ttselect, nommap, NULL, "pts", NULL, -1 };
119:
120: static struct cdevsw ptc_cdevsw =
121: { ptcopen, ptcclose, ptcread, ptcwrite, /*6*/
122: ptyioctl, nullstop, nullreset, ptydevtotty,/* ptyp */
123: ptcselect, nommap, NULL, "ptc", NULL, -1 };
124: #endif /* !NeXT */
125:
126:
127: #if NPTY == 1
128: #undef NPTY
129: #define NPTY 32 /* crude XXX */
130: #warning You have only one pty defined, redefining to 32.
131: #endif
132:
133: #ifndef NeXT
134: #ifdef DEVFS
135: #define MAXUNITS (8 * 32)
136: static void *devfs_token_pts[MAXUNITS];
137: static void *devfs_token_ptc[MAXUNITS];
138: static const char jnames[] = "pqrsPQRS";
139: #if NPTY > MAXUNITS
140: #undef NPTY
141: #define NPTY MAXUNITS
142: #warning Can't have more than 256 pty's with DEVFS defined.
143: #endif /* NPTY > MAXUNITS */
144: #endif /* DEVFS */
145: #endif /* !NeXT */
146:
147: #define BUFSIZ 100 /* Chunk size iomoved to/from user */
148:
149: /*
150: * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
151: * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv]
152: */
153: #ifndef NeXT
154: FREE_BSDSTATIC struct tty pt_tty[NPTY]; /* XXX */
155: #else /* NeXT */
156: /* NeXT All references to have been changed to indirections in the file */
157: FREE_BSDSTATIC struct tty *pt_tty[NPTY] = { NULL };
158: #endif /* ! NeXT */
159:
160: static struct pt_ioctl {
161: int pt_flags;
162: struct selinfo pt_selr, pt_selw;
163: u_char pt_send;
164: u_char pt_ucntl;
165: } pt_ioctl[NPTY]; /* XXX */
166: static int npty = NPTY; /* for pstat -t */
167:
168: #define PF_PKT 0x08 /* packet mode */
169: #define PF_STOPPED 0x10 /* user told stopped */
170: #define PF_REMOTE 0x20 /* remote and flow controlled input */
171: #define PF_NOSTOP 0x40
172: #define PF_UCNTL 0x80 /* user control mode */
173:
174: #ifdef notyet
175: /*
176: * Establish n (or default if n is 1) ptys in the system.
177: *
178: * XXX cdevsw & pstat require the array `pty[]' to be an array
179: */
180: FREEBSD_STATIC void
181: ptyattach(n)
182: int n;
183: {
184: char *mem;
185: register u_long ntb;
186: #define DEFAULT_NPTY 32
187:
188: /* maybe should allow 0 => none? */
189: if (n <= 1)
190: n = DEFAULT_NPTY;
191: ntb = n * sizeof(struct tty);
192: #ifndef NeXT
193: mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl),
194: M_DEVBUF, M_WAITOK);
195: #else
196: MALLOC(mem, char *, ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl),
197: M_DEVBUF, M_WAITOK);
198: #endif /* !NeXT */
199: pt_tty = (struct tty *)mem;
200: mem = (char *)ALIGN(mem + ntb);
201: pt_ioctl = (struct pt_ioctl *)mem;
202: npty = n;
203: }
204: #endif
205:
206: #ifndef DEVFS
207: int pty_init()
208: {
209: return 0;
210: }
211: #else
212: #include <miscfs/devfs/devfs.h>
213: #define START_CHAR 'p'
214: #define HEX_BASE 16
215: int pty_init(int n_ptys)
216: {
217: int i;
218: int j;
219:
220: /* create the pseudo tty device nodes */
221: for (j = 0; j < 10; j++) {
222: for (i = 0; i < HEX_BASE; i++) {
223: int m = j * HEX_BASE + i;
224: if (m == n_ptys)
225: goto done;
226: (void)devfs_make_node(makedev(4, m),
227: DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666,
228: "tty%c%x", j + START_CHAR, i);
229: (void)devfs_make_node(makedev(5, m),
230: DEVFS_CHAR, UID_ROOT, GID_WHEEL, 0666,
231: "pty%c%x", j + START_CHAR, i);
232: }
233: }
234: done:
235: return (0);
236: }
237: #endif DEVFS
238:
239: /*ARGSUSED*/
240: FREE_BSDSTATIC int
241: ptsopen(dev, flag, devtype, p)
242: dev_t dev;
243: int flag, devtype;
244: struct proc *p;
245: {
246: register struct tty *tp;
247: int error;
248:
249: #ifndef NeXT
250: tp = &pt_tty[minor(dev)];
251: #else
252: /*
253: * You will see this sourt of code coming up in diffs later both
254: * the ttymalloc and the tp indirection.
255: */
256: if (minor(dev) >= npty)
257: return (ENXIO);
258: if (!pt_tty[minor(dev)]) {
259: tp = pt_tty[minor(dev)] = ttymalloc();
260: } else
261: tp = pt_tty[minor(dev)];
262: #endif
263: if ((tp->t_state & TS_ISOPEN) == 0) {
264: ttychars(tp); /* Set up default chars */
265: tp->t_iflag = TTYDEF_IFLAG;
266: tp->t_oflag = TTYDEF_OFLAG;
267: tp->t_lflag = TTYDEF_LFLAG;
268: tp->t_cflag = TTYDEF_CFLAG;
269: tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
270: ttsetwater(tp); /* would be done in xxparam() */
271: } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
272: return (EBUSY);
273: if (tp->t_oproc) /* Ctrlr still around. */
274: (void)(*linesw[tp->t_line].l_modem)(tp, 1);
275: while ((tp->t_state & TS_CARR_ON) == 0) {
276: if (flag&FNONBLOCK)
277: break;
278: error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
279: "ptsopn", 0);
280: if (error)
281: return (error);
282: }
283: error = (*linesw[tp->t_line].l_open)(dev, tp);
284: if (error == 0)
285: ptcwakeup(tp, FREAD|FWRITE);
286: return (error);
287: }
288:
289: FREE_BSDSTATIC int
290: ptsclose(dev, flag, mode, p)
291: dev_t dev;
292: int flag, mode;
293: struct proc *p;
294: {
295: register struct tty *tp;
296: int err;
297:
298: tp = pt_tty[minor(dev)];
299: err = (*linesw[tp->t_line].l_close)(tp, flag);
300: ptsstop(tp, FREAD|FWRITE);
301: (void) ttyclose(tp);
302: return (err);
303: }
304:
305: FREE_BSDSTATIC int
306: ptsread(dev, uio, flag)
307: dev_t dev;
308: struct uio *uio;
309: int flag;
310: {
311: #ifndef NeXT
312: struct proc *p = curproc;
313: #else
314: struct proc *p = current_proc();
315: #endif /* NeXT */
316: register struct tty *tp = pt_tty[minor(dev)];
317: register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
318: int error = 0;
319:
320: again:
321: if (pti->pt_flags & PF_REMOTE) {
322: while (isbackground(p, tp)) {
323: if ((p->p_sigignore & sigmask(SIGTTIN)) ||
324: (p->p_sigmask & sigmask(SIGTTIN)) ||
325: p->p_pgrp->pg_jobc == 0 ||
326: p->p_flag & P_PPWAIT)
327: return (EIO);
328: pgsignal(p->p_pgrp, SIGTTIN, 1);
329: error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg",
330: 0);
331: if (error)
332: return (error);
333: }
334: if (tp->t_canq.c_cc == 0) {
335: if (flag & IO_NDELAY)
336: return (EWOULDBLOCK);
337: error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH,
338: "ptsin", 0);
339: if (error)
340: return (error);
341: goto again;
342: }
343: while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
344: if (ureadc(getc(&tp->t_canq), uio) < 0) {
345: error = EFAULT;
346: break;
347: }
348: if (tp->t_canq.c_cc == 1)
349: (void) getc(&tp->t_canq);
350: if (tp->t_canq.c_cc)
351: return (error);
352: } else
353: if (tp->t_oproc)
354: error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
355: ptcwakeup(tp, FWRITE);
356: return (error);
357: }
358:
359: /*
360: * Write to pseudo-tty.
361: * Wakeups of controlling tty will happen
362: * indirectly, when tty driver calls ptsstart.
363: */
364: FREE_BSDSTATIC int
365: ptswrite(dev, uio, flag)
366: dev_t dev;
367: struct uio *uio;
368: int flag;
369: {
370: register struct tty *tp;
371:
372: tp = pt_tty[minor(dev)];
373: if (tp->t_oproc == 0)
374: return (EIO);
375: return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
376: }
377:
378: /*
379: * Start output on pseudo-tty.
380: * Wake up process selecting or sleeping for input from controlling tty.
381: */
382: static void
383: ptsstart(tp)
384: struct tty *tp;
385: {
386: register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
387:
388: if (tp->t_state & TS_TTSTOP)
389: return;
390: if (pti->pt_flags & PF_STOPPED) {
391: pti->pt_flags &= ~PF_STOPPED;
392: pti->pt_send = TIOCPKT_START;
393: }
394: ptcwakeup(tp, FREAD);
395: }
396:
397: static void
398: ptcwakeup(tp, flag)
399: struct tty *tp;
400: int flag;
401: {
402: struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
403:
404: if (flag & FREAD) {
405: selwakeup(&pti->pt_selr);
406: wakeup(TSA_PTC_READ(tp));
407: }
408: if (flag & FWRITE) {
409: selwakeup(&pti->pt_selw);
410: wakeup(TSA_PTC_WRITE(tp));
411: }
412: }
413:
414: FREE_BSDSTATIC int
415: ptcopen(dev, flag, devtype, p)
416: dev_t dev;
417: int flag, devtype;
418: struct proc *p;
419: {
420: register struct tty *tp;
421: struct pt_ioctl *pti;
422:
423: if (minor(dev) >= npty)
424: return (ENXIO);
425: if(!pt_tty[minor(dev)]) {
426: tp = pt_tty[minor(dev)] = ttymalloc();
427: } else
428: tp = pt_tty[minor(dev)];
429: if (tp->t_oproc)
430: return (EIO);
431: tp->t_oproc = ptsstart;
432: #ifdef sun4c
433: tp->t_stop = ptsstop;
434: #endif
435: (void)(*linesw[tp->t_line].l_modem)(tp, 1);
436: tp->t_lflag &= ~EXTPROC;
437: pti = &pt_ioctl[minor(dev)];
438: pti->pt_flags = 0;
439: pti->pt_send = 0;
440: pti->pt_ucntl = 0;
441: return (0);
442: }
443:
444: FREE_BSDSTATIC int
445: ptcclose(dev, flags, fmt, p)
446: dev_t dev;
447: int flags;
448: int fmt;
449: struct proc *p;
450: {
451: register struct tty *tp;
452:
453: tp = pt_tty[minor(dev)];
454: (void)(*linesw[tp->t_line].l_modem)(tp, 0);
455:
456: /*
457: * XXX MDMBUF makes no sense for ptys but would inhibit the above
458: * l_modem(). CLOCAL makes sense but isn't supported. Special
459: * l_modem()s that ignore carrier drop make no sense for ptys but
460: * may be in use because other parts of the line discipline make
461: * sense for ptys. Recover by doing everything that a normal
462: * ttymodem() would have done except for sending a SIGHUP.
463: */
464: if (tp->t_state & TS_ISOPEN) {
465: tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
466: tp->t_state |= TS_ZOMBIE;
467: ttyflush(tp, FREAD | FWRITE);
468: }
469:
470: tp->t_oproc = 0; /* mark closed */
471: return (0);
472: }
473:
474: FREE_BSDSTATIC int
475: ptcread(dev, uio, flag)
476: dev_t dev;
477: struct uio *uio;
478: int flag;
479: {
480: register struct tty *tp = pt_tty[minor(dev)];
481: struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
482: char buf[BUFSIZ];
483: int error = 0, cc;
484:
485: /*
486: * We want to block until the slave
487: * is open, and there's something to read;
488: * but if we lost the slave or we're NBIO,
489: * then return the appropriate error instead.
490: */
491: for (;;) {
492: if (tp->t_state&TS_ISOPEN) {
493: if (pti->pt_flags&PF_PKT && pti->pt_send) {
494: error = ureadc((int)pti->pt_send, uio);
495: if (error)
496: return (error);
497: if (pti->pt_send & TIOCPKT_IOCTL) {
498: cc = min(uio->uio_resid,
499: sizeof(tp->t_termios));
500: uiomove((caddr_t)&tp->t_termios, cc,
501: uio);
502: }
503: pti->pt_send = 0;
504: return (0);
505: }
506: if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
507: error = ureadc((int)pti->pt_ucntl, uio);
508: if (error)
509: return (error);
510: pti->pt_ucntl = 0;
511: return (0);
512: }
513: if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
514: break;
515: }
516: if ((tp->t_state & TS_CONNECTED) == 0)
517: return (0); /* EOF */
518: if (flag & IO_NDELAY)
519: return (EWOULDBLOCK);
520: error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
521: if (error)
522: return (error);
523: }
524: if (pti->pt_flags & (PF_PKT|PF_UCNTL))
525: error = ureadc(0, uio);
526: while (uio->uio_resid > 0 && error == 0) {
527: cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ));
528: if (cc <= 0)
529: break;
530: error = uiomove(buf, cc, uio);
531: }
532: ttwwakeup(tp);
533: return (error);
534: }
535:
536: FREE_BSDSTATIC void
537: ptsstop(tp, flush)
538: register struct tty *tp;
539: int flush;
540: {
541: struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
542: int flag;
543:
544: /* note: FLUSHREAD and FLUSHWRITE already ok */
545: if (flush == 0) {
546: flush = TIOCPKT_STOP;
547: pti->pt_flags |= PF_STOPPED;
548: } else
549: pti->pt_flags &= ~PF_STOPPED;
550: pti->pt_send |= flush;
551: /* change of perspective */
552: flag = 0;
553: if (flush & FREAD)
554: flag |= FWRITE;
555: if (flush & FWRITE)
556: flag |= FREAD;
557: ptcwakeup(tp, flag);
558: }
559:
560: FREE_BSDSTATIC int
561: ptcselect(dev, rw, p)
562: dev_t dev;
563: int rw;
564: struct proc *p;
565: {
566: register struct tty *tp = pt_tty[minor(dev)];
567: struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
568: int s;
569:
570: if ((tp->t_state & TS_CONNECTED) == 0)
571: return (1);
572: switch (rw) {
573:
574: case FREAD:
575: /*
576: * Need to block timeouts (ttrstart).
577: */
578: s = spltty();
579: if ((tp->t_state&TS_ISOPEN) &&
580: tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
581: splx(s);
582: return (1);
583: }
584: splx(s);
585: /* FALLTHROUGH */
586:
587: case 0: /* exceptional */
588: if ((tp->t_state&TS_ISOPEN) &&
589: ((pti->pt_flags&PF_PKT && pti->pt_send) ||
590: (pti->pt_flags&PF_UCNTL && pti->pt_ucntl)))
591: return (1);
592: selrecord(p, &pti->pt_selr);
593: break;
594:
595:
596: case FWRITE:
597: if (tp->t_state&TS_ISOPEN) {
598: if (pti->pt_flags & PF_REMOTE) {
599: if (tp->t_canq.c_cc == 0)
600: return (1);
601: } else {
602: if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
603: return (1);
604: if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON))
605: return (1);
606: }
607: }
608: selrecord(p, &pti->pt_selw);
609: break;
610:
611: }
612: return (0);
613: }
614:
615: FREE_BSDSTATIC int
616: ptcwrite(dev, uio, flag)
617: dev_t dev;
618: register struct uio *uio;
619: int flag;
620: {
621: register struct tty *tp = pt_tty[minor(dev)];
622: register u_char *cp = NULL;
623: register int cc = 0;
624: u_char locbuf[BUFSIZ];
625: int cnt = 0;
626: struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
627: int error = 0;
628:
629: again:
630: if ((tp->t_state&TS_ISOPEN) == 0)
631: goto block;
632: if (pti->pt_flags & PF_REMOTE) {
633: if (tp->t_canq.c_cc)
634: goto block;
635: while ((uio->uio_resid > 0 || cc > 0) &&
636: tp->t_canq.c_cc < TTYHOG - 1) {
637: if (cc == 0) {
638: cc = min(uio->uio_resid, BUFSIZ);
639: cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
640: cp = locbuf;
641: error = uiomove((caddr_t)cp, cc, uio);
642: if (error)
643: return (error);
644: /* check again for safety */
645: if ((tp->t_state & TS_ISOPEN) == 0) {
646: /* adjust as usual */
647: uio->uio_resid += cc;
648: return (EIO);
649: }
650: }
651: if (cc > 0) {
652: cc = b_to_q((char *)cp, cc, &tp->t_canq);
653: /*
654: * XXX we don't guarantee that the canq size
655: * is >= TTYHOG, so the above b_to_q() may
656: * leave some bytes uncopied. However, space
657: * is guaranteed for the null terminator if
658: * we don't fail here since (TTYHOG - 1) is
659: * not a multiple of CBSIZE.
660: */
661: if (cc > 0)
662: break;
663: }
664: }
665: /* adjust for data copied in but not written */
666: uio->uio_resid += cc;
667: (void) putc(0, &tp->t_canq);
668: ttwakeup(tp);
669: wakeup(TSA_PTS_READ(tp));
670: return (0);
671: }
672: while (uio->uio_resid > 0 || cc > 0) {
673: if (cc == 0) {
674: cc = min(uio->uio_resid, BUFSIZ);
675: cp = locbuf;
676: error = uiomove((caddr_t)cp, cc, uio);
677: if (error)
678: return (error);
679: /* check again for safety */
680: if ((tp->t_state & TS_ISOPEN) == 0) {
681: /* adjust for data copied in but not written */
682: uio->uio_resid += cc;
683: return (EIO);
684: }
685: }
686: while (cc > 0) {
687: if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
688: (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) {
689: wakeup(TSA_HUP_OR_INPUT(tp));
690: goto block;
691: }
692: (*linesw[tp->t_line].l_rint)(*cp++, tp);
693: cnt++;
694: cc--;
695: }
696: cc = 0;
697: }
698: return (0);
699: block:
700: /*
701: * Come here to wait for slave to open, for space
702: * in outq, or space in rawq, or an empty canq.
703: */
704: if ((tp->t_state & TS_CONNECTED) == 0) {
705: /* adjust for data copied in but not written */
706: uio->uio_resid += cc;
707: return (EIO);
708: }
709: if (flag & IO_NDELAY) {
710: /* adjust for data copied in but not written */
711: uio->uio_resid += cc;
712: if (cnt == 0)
713: return (EWOULDBLOCK);
714: return (0);
715: }
716: error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
717: if (error) {
718: /* adjust for data copied in but not written */
719: uio->uio_resid += cc;
720: return (error);
721: }
722: goto again;
723: }
724:
725: #ifndef NeXT
726: /* XXX we eventually want to go to this model,
727: * but premier can't change the cdevsw */
728: static struct tty *
729: ptydevtotty(dev)
730: dev_t dev;
731: {
732: if (minor(dev) >= npty)
733: return (NULL);
734:
735: return &pt_tty[minor(dev)];
736: }
737: #endif /* !NeXT */
738:
739: /*ARGSUSED*/
740: FREE_BSDSTATIC int
741: #ifndef NeXT
742: ptyioctl(dev, cmd, data, flag)
743: dev_t dev;
744: int cmd;
745: caddr_t data;
746: int flag;
747: #else
748: ptyioctl(dev, cmd, data, flag, p)
749: dev_t dev;
750: u_long cmd;
751: caddr_t data;
752: int flag;
753: struct proc *p;
754: #endif
755: {
756: register struct tty *tp = pt_tty[minor(dev)];
757: register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
758: register u_char *cc = tp->t_cc;
759: int stop, error;
760:
761: /*
762: * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
763: * ttywflush(tp) will hang if there are characters in the outq.
764: */
765: if (cmd == TIOCEXT) {
766: /*
767: * When the EXTPROC bit is being toggled, we need
768: * to send an TIOCPKT_IOCTL if the packet driver
769: * is turned on.
770: */
771: if (*(int *)data) {
772: if (pti->pt_flags & PF_PKT) {
773: pti->pt_send |= TIOCPKT_IOCTL;
774: ptcwakeup(tp, FREAD);
775: }
776: tp->t_lflag |= EXTPROC;
777: } else {
778: if ((tp->t_lflag & EXTPROC) &&
779: (pti->pt_flags & PF_PKT)) {
780: pti->pt_send |= TIOCPKT_IOCTL;
781: ptcwakeup(tp, FREAD);
782: }
783: tp->t_lflag &= ~EXTPROC;
784: }
785: return(0);
786: } else
787: #ifndef NeXT
788: if (cdevsw[major(dev)]->d_open == ptcopen)
789: #else
790: if (cdevsw[major(dev)].d_open == ptcopen)
791: #endif
792: switch (cmd) {
793:
794: case TIOCGPGRP:
795: /*
796: * We aviod calling ttioctl on the controller since,
797: * in that case, tp must be the controlling terminal.
798: */
799: *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
800: return (0);
801:
802: case TIOCPKT:
803: if (*(int *)data) {
804: if (pti->pt_flags & PF_UCNTL)
805: return (EINVAL);
806: pti->pt_flags |= PF_PKT;
807: } else
808: pti->pt_flags &= ~PF_PKT;
809: return (0);
810:
811: case TIOCUCNTL:
812: if (*(int *)data) {
813: if (pti->pt_flags & PF_PKT)
814: return (EINVAL);
815: pti->pt_flags |= PF_UCNTL;
816: } else
817: pti->pt_flags &= ~PF_UCNTL;
818: return (0);
819:
820: case TIOCREMOTE:
821: if (*(int *)data)
822: pti->pt_flags |= PF_REMOTE;
823: else
824: pti->pt_flags &= ~PF_REMOTE;
825: ttyflush(tp, FREAD|FWRITE);
826: return (0);
827:
828: #ifdef COMPAT_43
829: case TIOCSETP:
830: case TIOCSETN:
831: #endif
832: case TIOCSETD:
833: case TIOCSETA:
834: case TIOCSETAW:
835: case TIOCSETAF:
836: ndflush(&tp->t_outq, tp->t_outq.c_cc);
837: break;
838:
839: case TIOCSIG:
840: if (*(unsigned int *)data >= NSIG ||
841: *(unsigned int *)data == 0)
842: return(EINVAL);
843: if ((tp->t_lflag&NOFLSH) == 0)
844: ttyflush(tp, FREAD|FWRITE);
845: pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
846: if ((*(unsigned int *)data == SIGINFO) &&
847: ((tp->t_lflag&NOKERNINFO) == 0))
848: ttyinfo(tp);
849: return(0);
850: }
851: error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
852: if (error < 0)
853: error = ttioctl(tp, cmd, data, flag, p);
854: if (error < 0) {
855: if (pti->pt_flags & PF_UCNTL &&
856: (cmd & ~0xff) == UIOCCMD(0)) {
857: if (cmd & 0xff) {
858: pti->pt_ucntl = (u_char)cmd;
859: ptcwakeup(tp, FREAD);
860: }
861: return (0);
862: }
863: error = ENOTTY;
864: }
865: /*
866: * If external processing and packet mode send ioctl packet.
867: */
868: if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
869: switch(cmd) {
870: case TIOCSETA:
871: case TIOCSETAW:
872: case TIOCSETAF:
873: #ifdef COMPAT_43
874: case TIOCSETP:
875: case TIOCSETN:
876: #endif
877: #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
878: case TIOCSETC:
879: case TIOCSLTC:
880: case TIOCLBIS:
881: case TIOCLBIC:
882: case TIOCLSET:
883: #endif
884: pti->pt_send |= TIOCPKT_IOCTL;
885: ptcwakeup(tp, FREAD);
886: default:
887: break;
888: }
889: }
890: stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
891: && CCEQ(cc[VSTART], CTRL('q'));
892: if (pti->pt_flags & PF_NOSTOP) {
893: if (stop) {
894: pti->pt_send &= ~TIOCPKT_NOSTOP;
895: pti->pt_send |= TIOCPKT_DOSTOP;
896: pti->pt_flags &= ~PF_NOSTOP;
897: ptcwakeup(tp, FREAD);
898: }
899: } else {
900: if (!stop) {
901: pti->pt_send &= ~TIOCPKT_DOSTOP;
902: pti->pt_send |= TIOCPKT_NOSTOP;
903: pti->pt_flags |= PF_NOSTOP;
904: ptcwakeup(tp, FREAD);
905: }
906: }
907: return (error);
908: }
909:
910: #ifndef NeXT
911: static ptc_devsw_installed = 0;
912:
913: static void
914: ptc_drvinit(void *unused)
915: {
916: #ifdef DEVFS
917: int i,j,k;
918: #endif
919: dev_t dev;
920:
921: if( ! ptc_devsw_installed ) {
922: dev = makedev(CDEV_MAJOR_S, 0);
923: cdevsw_add(&dev, &pts_cdevsw, NULL);
924: dev = makedev(CDEV_MAJOR_C, 0);
925: cdevsw_add(&dev, &ptc_cdevsw, NULL);
926: ptc_devsw_installed = 1;
927: #ifdef DEVFS
928: for ( i = 0 ; i<NPTY ; i++ ) {
929: j = i / 32;
930: k = i % 32;
931: devfs_token_pts[i] =
932: devfs_add_devswf(&pts_cdevsw,i,
933: DV_CHR,0,0,0666,
934: "tty%c%n",jnames[j],k);
935: devfs_token_ptc[i] =
936: devfs_add_devswf(&ptc_cdevsw,i,
937: DV_CHR,0,0,0666,
938: "pty%c%n",jnames[j],k);
939: }
940: #endif
941: }
942: }
943:
944: SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)
945: #endif /* !NeXT */
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