pty.c revision 51654
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1982, 1986, 1989, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 3314511Shsu * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 3450477Speter * $FreeBSD: head/sys/kern/tty_pty.c 51654 1999-09-25 16:21:39Z phk $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes/* 381541Srgrimes * Pseudo-teletype Driver 391541Srgrimes * (Actually two drivers, requiring two entries in 'cdevsw') 401541Srgrimes */ 411541Srgrimes#include "pty.h" /* XXX */ 4231778Seivind#include "opt_compat.h" 431541Srgrimes#include <sys/param.h> 441541Srgrimes#include <sys/systm.h> 4524207Sbde#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 4624207Sbde#include <sys/ioctl_compat.h> 4724207Sbde#endif 481541Srgrimes#include <sys/proc.h> 491541Srgrimes#include <sys/tty.h> 501541Srgrimes#include <sys/conf.h> 5124131Sbde#include <sys/fcntl.h> 5229354Speter#include <sys/poll.h> 531541Srgrimes#include <sys/kernel.h> 541541Srgrimes#include <sys/vnode.h> 553308Sphk#include <sys/signalvar.h> 5649536Sphk#include <sys/malloc.h> 571541Srgrimes 5849536SphkMALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 5912517Sjulian 6012819Sphkstatic void ptsstart __P((struct tty *tp)); 6151654Sphkstatic void ptsstop __P((struct tty *tp, int rw)); 6212819Sphkstatic void ptcwakeup __P((struct tty *tp, int flag)); 6349536Sphkstatic void ptyinit __P((int n)); 6411789Sbde 6512675Sjulianstatic d_open_t ptsopen; 6612675Sjulianstatic d_close_t ptsclose; 6712675Sjulianstatic d_read_t ptsread; 6812675Sjulianstatic d_write_t ptswrite; 6912675Sjulianstatic d_ioctl_t ptyioctl; 7012675Sjulianstatic d_open_t ptcopen; 7112675Sjulianstatic d_close_t ptcclose; 7212675Sjulianstatic d_read_t ptcread; 7312675Sjulianstatic d_write_t ptcwrite; 7429354Speterstatic d_poll_t ptcpoll; 7512675Sjulian 7638485Sbde#define CDEV_MAJOR_S 5 7747625Sphkstatic struct cdevsw pts_cdevsw = { 7847625Sphk /* open */ ptsopen, 7947625Sphk /* close */ ptsclose, 8047625Sphk /* read */ ptsread, 8147625Sphk /* write */ ptswrite, 8247625Sphk /* ioctl */ ptyioctl, 8351654Sphk /* stop */ nostop, 8447625Sphk /* reset */ noreset, 8551654Sphk /* devtotty */ nodevtotty, 8651654Sphk /* poll */ ttypoll, 8747625Sphk /* mmap */ nommap, 8847625Sphk /* strategy */ nostrategy, 8947625Sphk /* name */ "pts", 9047625Sphk /* parms */ noparms, 9147625Sphk /* maj */ CDEV_MAJOR_S, 9247625Sphk /* dump */ nodump, 9347625Sphk /* psize */ nopsize, 9447625Sphk /* flags */ D_TTY, 9547625Sphk /* maxio */ 0, 9647625Sphk /* bmaj */ -1 9738485Sbde}; 9812675Sjulian 9938485Sbde#define CDEV_MAJOR_C 6 10047625Sphkstatic struct cdevsw ptc_cdevsw = { 10147625Sphk /* open */ ptcopen, 10247625Sphk /* close */ ptcclose, 10347625Sphk /* read */ ptcread, 10447625Sphk /* write */ ptcwrite, 10547625Sphk /* ioctl */ ptyioctl, 10647625Sphk /* stop */ nostop, 10747625Sphk /* reset */ noreset, 10851654Sphk /* devtotty */ nodevtotty, 10947625Sphk /* poll */ ptcpoll, 11047625Sphk /* mmap */ nommap, 11147625Sphk /* strategy */ nostrategy, 11247625Sphk /* name */ "ptc", 11347625Sphk /* parms */ noparms, 11447625Sphk /* maj */ CDEV_MAJOR_C, 11547625Sphk /* dump */ nodump, 11647625Sphk /* psize */ nopsize, 11747625Sphk /* flags */ D_TTY, 11847625Sphk /* maxio */ 0, 11947625Sphk /* bmaj */ -1 12038485Sbde}; 12112675Sjulian 1221541Srgrimes#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 1231541Srgrimes 12449536Sphkstruct pt_ioctl { 1251541Srgrimes int pt_flags; 1261541Srgrimes struct selinfo pt_selr, pt_selw; 1271541Srgrimes u_char pt_send; 1281541Srgrimes u_char pt_ucntl; 12949536Sphk struct tty pt_tty; 13050092Sjulian dev_t devs, devc; 13149536Sphk}; 1321541Srgrimes 1331541Srgrimes#define PF_PKT 0x08 /* packet mode */ 1341541Srgrimes#define PF_STOPPED 0x10 /* user told stopped */ 1351541Srgrimes#define PF_REMOTE 0x20 /* remote and flow controlled input */ 1361541Srgrimes#define PF_NOSTOP 0x40 1371541Srgrimes#define PF_UCNTL 0x80 /* user control mode */ 1381541Srgrimes 1391541Srgrimes/* 14049536Sphk * This function creates and initializes a pts/ptc pair 1411541Srgrimes * 14249536Sphk * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 14349536Sphk * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 14449536Sphk * 14549536Sphk * XXX: define and add mapping of upper minor bits to allow more 14649536Sphk * than 256 ptys. 1471541Srgrimes */ 14812819Sphkstatic void 14949536Sphkptyinit(n) 1501541Srgrimes int n; 1511541Srgrimes{ 15249536Sphk dev_t devs, devc; 15349536Sphk char *names = "pqrsPQRS"; 15449536Sphk struct pt_ioctl *pt; 1551541Srgrimes 15649536Sphk /* For now we only map the lower 8 bits of the minor */ 15749536Sphk if (n & ~0xff) 15849536Sphk return; 15949536Sphk 16050092Sjulian pt = malloc(sizeof(*pt), M_PTY, M_WAITOK); 16150092Sjulian bzero(pt, sizeof(*pt)); 16250092Sjulian pt->devs = devs = make_dev(&pts_cdevsw, n, 16349536Sphk 0, 0, 0666, "tty%c%r", names[n / 32], n % 32); 16450092Sjulian pt->devc = devc = make_dev(&ptc_cdevsw, n, 16549536Sphk 0, 0, 0666, "pty%c%r", names[n / 32], n % 32); 16649536Sphk 16749536Sphk devs->si_drv1 = devc->si_drv1 = pt; 16850652Sphk devs->si_tty = devc->si_tty = &pt->pt_tty; 16949540Sphk ttyregister(&pt->pt_tty); 17016322Sgpalmer} 1711541Srgrimes 1721541Srgrimes/*ARGSUSED*/ 17312675Sjulianstatic int 1741541Srgrimesptsopen(dev, flag, devtype, p) 1751541Srgrimes dev_t dev; 1761541Srgrimes int flag, devtype; 1771541Srgrimes struct proc *p; 1781541Srgrimes{ 1791541Srgrimes register struct tty *tp; 1801541Srgrimes int error; 18149992Sjulian int minr; 18249992Sjulian dev_t nextdev; 1831541Srgrimes 18449992Sjulian /* 18550254Sphk * XXX: Gross hack for DEVFS: 18649992Sjulian * If we openned this device, ensure we have the 18750254Sphk * next one too, so people can open it. 18849992Sjulian */ 18949992Sjulian minr = lminor(dev); 19049992Sjulian if (minr < 255) { 19149992Sjulian nextdev = makedev(major(dev), minr + 1); 19249992Sjulian if (!nextdev->si_drv1) { 19349992Sjulian ptyinit(minr + 1); 19449992Sjulian } 19549992Sjulian } 19649536Sphk if (!dev->si_drv1) 19749536Sphk ptyinit(minor(dev)); 19849536Sphk if (!dev->si_drv1) 19949536Sphk return(ENXIO); 20050652Sphk tp = dev->si_tty; 2011541Srgrimes if ((tp->t_state & TS_ISOPEN) == 0) { 2021541Srgrimes ttychars(tp); /* Set up default chars */ 2031541Srgrimes tp->t_iflag = TTYDEF_IFLAG; 2041541Srgrimes tp->t_oflag = TTYDEF_OFLAG; 2051541Srgrimes tp->t_lflag = TTYDEF_LFLAG; 2061541Srgrimes tp->t_cflag = TTYDEF_CFLAG; 2071541Srgrimes tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 20846112Sphk } else if (tp->t_state & TS_XCLUDE && suser(p)) 2091541Srgrimes return (EBUSY); 2101541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 2119824Sbde (void)(*linesw[tp->t_line].l_modem)(tp, 1); 2121541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 2131541Srgrimes if (flag&FNONBLOCK) 2141541Srgrimes break; 2159639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 2169624Sbde "ptsopn", 0); 2173308Sphk if (error) 2181541Srgrimes return (error); 2191541Srgrimes } 2201541Srgrimes error = (*linesw[tp->t_line].l_open)(dev, tp); 2217724Sache if (error == 0) 2227724Sache ptcwakeup(tp, FREAD|FWRITE); 2231541Srgrimes return (error); 2241541Srgrimes} 2251541Srgrimes 22612675Sjulianstatic int 2271541Srgrimesptsclose(dev, flag, mode, p) 2281541Srgrimes dev_t dev; 2291541Srgrimes int flag, mode; 2301541Srgrimes struct proc *p; 2311541Srgrimes{ 2321541Srgrimes register struct tty *tp; 2331541Srgrimes int err; 2341541Srgrimes 23550652Sphk tp = dev->si_tty; 2361541Srgrimes err = (*linesw[tp->t_line].l_close)(tp, flag); 2377730Sache ptsstop(tp, FREAD|FWRITE); 2387724Sache (void) ttyclose(tp); 2391541Srgrimes return (err); 2401541Srgrimes} 2411541Srgrimes 24212675Sjulianstatic int 2431541Srgrimesptsread(dev, uio, flag) 2441541Srgrimes dev_t dev; 2451541Srgrimes struct uio *uio; 2461541Srgrimes int flag; 2471541Srgrimes{ 2481541Srgrimes struct proc *p = curproc; 24950652Sphk register struct tty *tp = dev->si_tty; 25049536Sphk register struct pt_ioctl *pti = dev->si_drv1; 2511541Srgrimes int error = 0; 2521541Srgrimes 2531541Srgrimesagain: 2541541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2551541Srgrimes while (isbackground(p, tp)) { 2561541Srgrimes if ((p->p_sigignore & sigmask(SIGTTIN)) || 2571541Srgrimes (p->p_sigmask & sigmask(SIGTTIN)) || 2581541Srgrimes p->p_pgrp->pg_jobc == 0 || 2591541Srgrimes p->p_flag & P_PPWAIT) 2601541Srgrimes return (EIO); 2611541Srgrimes pgsignal(p->p_pgrp, SIGTTIN, 1); 2629624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2639624Sbde 0); 2643308Sphk if (error) 2651541Srgrimes return (error); 2661541Srgrimes } 2671541Srgrimes if (tp->t_canq.c_cc == 0) { 2681541Srgrimes if (flag & IO_NDELAY) 2691541Srgrimes return (EWOULDBLOCK); 2709639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2719624Sbde "ptsin", 0); 2723308Sphk if (error) 2731541Srgrimes return (error); 2741541Srgrimes goto again; 2751541Srgrimes } 2761541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2771541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2781541Srgrimes error = EFAULT; 2791541Srgrimes break; 2801541Srgrimes } 2811541Srgrimes if (tp->t_canq.c_cc == 1) 2821541Srgrimes (void) getc(&tp->t_canq); 2831541Srgrimes if (tp->t_canq.c_cc) 2841541Srgrimes return (error); 2851541Srgrimes } else 2861541Srgrimes if (tp->t_oproc) 2871541Srgrimes error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 2881541Srgrimes ptcwakeup(tp, FWRITE); 2891541Srgrimes return (error); 2901541Srgrimes} 2911541Srgrimes 2921541Srgrimes/* 2931541Srgrimes * Write to pseudo-tty. 2941541Srgrimes * Wakeups of controlling tty will happen 2951541Srgrimes * indirectly, when tty driver calls ptsstart. 2961541Srgrimes */ 29712675Sjulianstatic int 2981541Srgrimesptswrite(dev, uio, flag) 2991541Srgrimes dev_t dev; 3001541Srgrimes struct uio *uio; 3011541Srgrimes int flag; 3021541Srgrimes{ 3031541Srgrimes register struct tty *tp; 3041541Srgrimes 30550652Sphk tp = dev->si_tty; 3061541Srgrimes if (tp->t_oproc == 0) 3071541Srgrimes return (EIO); 3081541Srgrimes return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 3091541Srgrimes} 3101541Srgrimes 3111541Srgrimes/* 3121541Srgrimes * Start output on pseudo-tty. 3131541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 3141541Srgrimes */ 31512819Sphkstatic void 3161541Srgrimesptsstart(tp) 3171541Srgrimes struct tty *tp; 3181541Srgrimes{ 31949536Sphk register struct pt_ioctl *pti = tp->t_dev->si_drv1; 3201541Srgrimes 3211541Srgrimes if (tp->t_state & TS_TTSTOP) 3221541Srgrimes return; 3231541Srgrimes if (pti->pt_flags & PF_STOPPED) { 3241541Srgrimes pti->pt_flags &= ~PF_STOPPED; 3251541Srgrimes pti->pt_send = TIOCPKT_START; 3261541Srgrimes } 3271541Srgrimes ptcwakeup(tp, FREAD); 3281541Srgrimes} 3291541Srgrimes 33012819Sphkstatic void 3311541Srgrimesptcwakeup(tp, flag) 3321541Srgrimes struct tty *tp; 3331541Srgrimes int flag; 3341541Srgrimes{ 33549536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 3361541Srgrimes 3371541Srgrimes if (flag & FREAD) { 3381541Srgrimes selwakeup(&pti->pt_selr); 3399639Sbde wakeup(TSA_PTC_READ(tp)); 3401541Srgrimes } 3411541Srgrimes if (flag & FWRITE) { 3421541Srgrimes selwakeup(&pti->pt_selw); 3439639Sbde wakeup(TSA_PTC_WRITE(tp)); 3441541Srgrimes } 3451541Srgrimes} 3461541Srgrimes 34712675Sjulianstatic int 3481541Srgrimesptcopen(dev, flag, devtype, p) 3491541Srgrimes dev_t dev; 3501541Srgrimes int flag, devtype; 3511541Srgrimes struct proc *p; 3521541Srgrimes{ 3531541Srgrimes register struct tty *tp; 3541541Srgrimes struct pt_ioctl *pti; 3551541Srgrimes 35649536Sphk if (!dev->si_drv1) 35749536Sphk ptyinit(minor(dev)); 35849536Sphk if (!dev->si_drv1) 35949536Sphk return(ENXIO); 36050652Sphk tp = dev->si_tty; 3611541Srgrimes if (tp->t_oproc) 3621541Srgrimes return (EIO); 3631541Srgrimes tp->t_oproc = ptsstart; 36451654Sphk tp->t_stop = ptsstop; 3651541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 1); 3661541Srgrimes tp->t_lflag &= ~EXTPROC; 36749536Sphk pti = dev->si_drv1; 3681541Srgrimes pti->pt_flags = 0; 3691541Srgrimes pti->pt_send = 0; 3701541Srgrimes pti->pt_ucntl = 0; 3711541Srgrimes return (0); 3721541Srgrimes} 3731541Srgrimes 37412675Sjulianstatic int 37510624Sbdeptcclose(dev, flags, fmt, p) 3761541Srgrimes dev_t dev; 37710624Sbde int flags; 37810624Sbde int fmt; 37910624Sbde struct proc *p; 3801541Srgrimes{ 3811541Srgrimes register struct tty *tp; 3821541Srgrimes 38350652Sphk tp = dev->si_tty; 3841541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 0); 3859824Sbde 3869824Sbde /* 3879824Sbde * XXX MDMBUF makes no sense for ptys but would inhibit the above 3889824Sbde * l_modem(). CLOCAL makes sense but isn't supported. Special 3899824Sbde * l_modem()s that ignore carrier drop make no sense for ptys but 3909824Sbde * may be in use because other parts of the line discipline make 3919824Sbde * sense for ptys. Recover by doing everything that a normal 3929824Sbde * ttymodem() would have done except for sending a SIGHUP. 3939824Sbde */ 3949850Sbde if (tp->t_state & TS_ISOPEN) { 3959850Sbde tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 3969850Sbde tp->t_state |= TS_ZOMBIE; 3979850Sbde ttyflush(tp, FREAD | FWRITE); 3989850Sbde } 3999824Sbde 4001541Srgrimes tp->t_oproc = 0; /* mark closed */ 4011541Srgrimes return (0); 4021541Srgrimes} 4031541Srgrimes 40412675Sjulianstatic int 4051541Srgrimesptcread(dev, uio, flag) 4061541Srgrimes dev_t dev; 4071541Srgrimes struct uio *uio; 4081541Srgrimes int flag; 4091541Srgrimes{ 41050652Sphk register struct tty *tp = dev->si_tty; 41149536Sphk struct pt_ioctl *pti = dev->si_drv1; 4121541Srgrimes char buf[BUFSIZ]; 4131541Srgrimes int error = 0, cc; 4141541Srgrimes 4151541Srgrimes /* 4161541Srgrimes * We want to block until the slave 4171541Srgrimes * is open, and there's something to read; 4181541Srgrimes * but if we lost the slave or we're NBIO, 4191541Srgrimes * then return the appropriate error instead. 4201541Srgrimes */ 4211541Srgrimes for (;;) { 4221541Srgrimes if (tp->t_state&TS_ISOPEN) { 4231541Srgrimes if (pti->pt_flags&PF_PKT && pti->pt_send) { 4241541Srgrimes error = ureadc((int)pti->pt_send, uio); 4251541Srgrimes if (error) 4261541Srgrimes return (error); 4271541Srgrimes if (pti->pt_send & TIOCPKT_IOCTL) { 4281541Srgrimes cc = min(uio->uio_resid, 4291541Srgrimes sizeof(tp->t_termios)); 4302807Sbde uiomove((caddr_t)&tp->t_termios, cc, 4312807Sbde uio); 4321541Srgrimes } 4331541Srgrimes pti->pt_send = 0; 4341541Srgrimes return (0); 4351541Srgrimes } 4361541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 4371541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 4381541Srgrimes if (error) 4391541Srgrimes return (error); 4401541Srgrimes pti->pt_ucntl = 0; 4411541Srgrimes return (0); 4421541Srgrimes } 4431541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4441541Srgrimes break; 4451541Srgrimes } 4469824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4471541Srgrimes return (0); /* EOF */ 4481541Srgrimes if (flag & IO_NDELAY) 4491541Srgrimes return (EWOULDBLOCK); 4509639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4513308Sphk if (error) 4521541Srgrimes return (error); 4531541Srgrimes } 4541541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4551541Srgrimes error = ureadc(0, uio); 4561541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4571541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4581541Srgrimes if (cc <= 0) 4591541Srgrimes break; 4601541Srgrimes error = uiomove(buf, cc, uio); 4611541Srgrimes } 4629626Sbde ttwwakeup(tp); 4631541Srgrimes return (error); 4641541Srgrimes} 4651541Srgrimes 46612675Sjulianstatic void 4671541Srgrimesptsstop(tp, flush) 4681541Srgrimes register struct tty *tp; 4691541Srgrimes int flush; 4701541Srgrimes{ 47149536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 4721541Srgrimes int flag; 4731541Srgrimes 4741541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4751541Srgrimes if (flush == 0) { 4761541Srgrimes flush = TIOCPKT_STOP; 4771541Srgrimes pti->pt_flags |= PF_STOPPED; 4781541Srgrimes } else 4791541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4801541Srgrimes pti->pt_send |= flush; 4811541Srgrimes /* change of perspective */ 4821541Srgrimes flag = 0; 4831541Srgrimes if (flush & FREAD) 4841541Srgrimes flag |= FWRITE; 4851541Srgrimes if (flush & FWRITE) 4861541Srgrimes flag |= FREAD; 4871541Srgrimes ptcwakeup(tp, flag); 4881541Srgrimes} 4891541Srgrimes 49012675Sjulianstatic int 49129354Speterptcpoll(dev, events, p) 4921541Srgrimes dev_t dev; 49329354Speter int events; 4941541Srgrimes struct proc *p; 4951541Srgrimes{ 49650652Sphk register struct tty *tp = dev->si_tty; 49749536Sphk struct pt_ioctl *pti = dev->si_drv1; 49829354Speter int revents = 0; 4991541Srgrimes int s; 5001541Srgrimes 5019824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 50229354Speter return (seltrue(dev, events, p) | POLLHUP); 5031541Srgrimes 50429354Speter /* 50529354Speter * Need to block timeouts (ttrstart). 50629354Speter */ 50729354Speter s = spltty(); 5081541Srgrimes 50929354Speter if (events & (POLLIN | POLLRDNORM)) 51029354Speter if ((tp->t_state & TS_ISOPEN) && 51129354Speter ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 51229354Speter ((pti->pt_flags & PF_PKT) && pti->pt_send) || 51329354Speter ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 51429354Speter revents |= events & (POLLIN | POLLRDNORM); 5151541Srgrimes 51629354Speter if (events & (POLLOUT | POLLWRNORM)) 51729354Speter if (tp->t_state & TS_ISOPEN && 51829354Speter ((pti->pt_flags & PF_REMOTE) ? 51929354Speter (tp->t_canq.c_cc == 0) : 52029354Speter ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 52129354Speter (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 52229354Speter revents |= events & (POLLOUT | POLLWRNORM); 5231541Srgrimes 52429354Speter if (events & POLLHUP) 52529354Speter if ((tp->t_state & TS_CARR_ON) == 0) 52629354Speter revents |= POLLHUP; 5271541Srgrimes 52829354Speter if (revents == 0) { 52929354Speter if (events & (POLLIN | POLLRDNORM)) 53029354Speter selrecord(p, &pti->pt_selr); 53129354Speter 53229354Speter if (events & (POLLOUT | POLLWRNORM)) 53329354Speter selrecord(p, &pti->pt_selw); 5341541Srgrimes } 53529354Speter splx(s); 53629354Speter 53729354Speter return (revents); 5381541Srgrimes} 5391541Srgrimes 54012675Sjulianstatic int 5411541Srgrimesptcwrite(dev, uio, flag) 5421541Srgrimes dev_t dev; 5431541Srgrimes register struct uio *uio; 5441541Srgrimes int flag; 5451541Srgrimes{ 54650652Sphk register struct tty *tp = dev->si_tty; 5471549Srgrimes register u_char *cp = 0; 5481541Srgrimes register int cc = 0; 5491541Srgrimes u_char locbuf[BUFSIZ]; 5501541Srgrimes int cnt = 0; 55149536Sphk struct pt_ioctl *pti = dev->si_drv1; 5521541Srgrimes int error = 0; 5531541Srgrimes 5541541Srgrimesagain: 5551541Srgrimes if ((tp->t_state&TS_ISOPEN) == 0) 5561541Srgrimes goto block; 5571541Srgrimes if (pti->pt_flags & PF_REMOTE) { 5581541Srgrimes if (tp->t_canq.c_cc) 5591541Srgrimes goto block; 56011789Sbde while ((uio->uio_resid > 0 || cc > 0) && 56111789Sbde tp->t_canq.c_cc < TTYHOG - 1) { 5621541Srgrimes if (cc == 0) { 5631541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5641541Srgrimes cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 5651541Srgrimes cp = locbuf; 5661541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5671541Srgrimes if (error) 5681541Srgrimes return (error); 5691541Srgrimes /* check again for safety */ 57011789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 57111789Sbde /* adjust as usual */ 57211789Sbde uio->uio_resid += cc; 5731541Srgrimes return (EIO); 57411789Sbde } 5751541Srgrimes } 57615199Sbde if (cc > 0) { 57715199Sbde cc = b_to_q((char *)cp, cc, &tp->t_canq); 57815199Sbde /* 57915199Sbde * XXX we don't guarantee that the canq size 58015199Sbde * is >= TTYHOG, so the above b_to_q() may 58115199Sbde * leave some bytes uncopied. However, space 58215199Sbde * is guaranteed for the null terminator if 58315199Sbde * we don't fail here since (TTYHOG - 1) is 58415199Sbde * not a multiple of CBSIZE. 58515199Sbde */ 58615199Sbde if (cc > 0) 58715199Sbde break; 58815199Sbde } 5891541Srgrimes } 59011789Sbde /* adjust for data copied in but not written */ 59111789Sbde uio->uio_resid += cc; 5921541Srgrimes (void) putc(0, &tp->t_canq); 5931541Srgrimes ttwakeup(tp); 5949639Sbde wakeup(TSA_PTS_READ(tp)); 5951541Srgrimes return (0); 5961541Srgrimes } 59711789Sbde while (uio->uio_resid > 0 || cc > 0) { 5981541Srgrimes if (cc == 0) { 5991541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 6001541Srgrimes cp = locbuf; 6011541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 6021541Srgrimes if (error) 6031541Srgrimes return (error); 6041541Srgrimes /* check again for safety */ 60511789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 60611789Sbde /* adjust for data copied in but not written */ 60711789Sbde uio->uio_resid += cc; 6081541Srgrimes return (EIO); 60911789Sbde } 6101541Srgrimes } 6111541Srgrimes while (cc > 0) { 6121541Srgrimes if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 6131541Srgrimes (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 6149824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 6151541Srgrimes goto block; 6161541Srgrimes } 6171541Srgrimes (*linesw[tp->t_line].l_rint)(*cp++, tp); 6181541Srgrimes cnt++; 6191541Srgrimes cc--; 6201541Srgrimes } 6211541Srgrimes cc = 0; 6221541Srgrimes } 6231541Srgrimes return (0); 6241541Srgrimesblock: 6251541Srgrimes /* 6261541Srgrimes * Come here to wait for slave to open, for space 62715199Sbde * in outq, or space in rawq, or an empty canq. 6281541Srgrimes */ 62911789Sbde if ((tp->t_state & TS_CONNECTED) == 0) { 63011789Sbde /* adjust for data copied in but not written */ 63111789Sbde uio->uio_resid += cc; 6321541Srgrimes return (EIO); 63311789Sbde } 6341541Srgrimes if (flag & IO_NDELAY) { 6351541Srgrimes /* adjust for data copied in but not written */ 6361541Srgrimes uio->uio_resid += cc; 6371541Srgrimes if (cnt == 0) 6381541Srgrimes return (EWOULDBLOCK); 6391541Srgrimes return (0); 6401541Srgrimes } 6419639Sbde error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 6423308Sphk if (error) { 6431541Srgrimes /* adjust for data copied in but not written */ 6441541Srgrimes uio->uio_resid += cc; 6451541Srgrimes return (error); 6461541Srgrimes } 6471541Srgrimes goto again; 6481541Srgrimes} 6491541Srgrimes 6501541Srgrimes/*ARGSUSED*/ 65112675Sjulianstatic int 6521541Srgrimesptyioctl(dev, cmd, data, flag, p) 6531541Srgrimes dev_t dev; 65436735Sdfr u_long cmd; 6551541Srgrimes caddr_t data; 6561541Srgrimes int flag; 6571541Srgrimes struct proc *p; 6581541Srgrimes{ 65950652Sphk register struct tty *tp = dev->si_tty; 66049536Sphk register struct pt_ioctl *pti = dev->si_drv1; 6611541Srgrimes register u_char *cc = tp->t_cc; 6621541Srgrimes int stop, error; 6631541Srgrimes 66447301Sluoqi if (devsw(dev)->d_open == ptcopen) { 6651541Srgrimes switch (cmd) { 6661541Srgrimes 6671541Srgrimes case TIOCGPGRP: 6681541Srgrimes /* 66933826Sbde * We avoid calling ttioctl on the controller since, 6701541Srgrimes * in that case, tp must be the controlling terminal. 6711541Srgrimes */ 6721541Srgrimes *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 6731541Srgrimes return (0); 6741541Srgrimes 6751541Srgrimes case TIOCPKT: 6761541Srgrimes if (*(int *)data) { 6771541Srgrimes if (pti->pt_flags & PF_UCNTL) 6781541Srgrimes return (EINVAL); 6791541Srgrimes pti->pt_flags |= PF_PKT; 6801541Srgrimes } else 6811541Srgrimes pti->pt_flags &= ~PF_PKT; 6821541Srgrimes return (0); 6831541Srgrimes 6841541Srgrimes case TIOCUCNTL: 6851541Srgrimes if (*(int *)data) { 6861541Srgrimes if (pti->pt_flags & PF_PKT) 6871541Srgrimes return (EINVAL); 6881541Srgrimes pti->pt_flags |= PF_UCNTL; 6891541Srgrimes } else 6901541Srgrimes pti->pt_flags &= ~PF_UCNTL; 6911541Srgrimes return (0); 6921541Srgrimes 6931541Srgrimes case TIOCREMOTE: 6941541Srgrimes if (*(int *)data) 6951541Srgrimes pti->pt_flags |= PF_REMOTE; 6961541Srgrimes else 6971541Srgrimes pti->pt_flags &= ~PF_REMOTE; 6981541Srgrimes ttyflush(tp, FREAD|FWRITE); 6991541Srgrimes return (0); 70047203Sluoqi } 7011541Srgrimes 70247203Sluoqi /* 70347203Sluoqi * The rest of the ioctls shouldn't be called until 70447301Sluoqi * the slave is open. 70547203Sluoqi */ 70647203Sluoqi if ((tp->t_state & TS_ISOPEN) == 0) 70747301Sluoqi return (EAGAIN); 70847203Sluoqi 70947203Sluoqi switch (cmd) { 7101541Srgrimes#ifdef COMPAT_43 7118876Srgrimes case TIOCSETP: 7121541Srgrimes case TIOCSETN: 7131541Srgrimes#endif 7141541Srgrimes case TIOCSETD: 7151541Srgrimes case TIOCSETA: 7161541Srgrimes case TIOCSETAW: 7179858Sache case TIOCSETAF: 71847301Sluoqi /* 71947301Sluoqi * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 72047301Sluoqi * ttywflush(tp) will hang if there are characters in 72147301Sluoqi * the outq. 72247301Sluoqi */ 7231541Srgrimes ndflush(&tp->t_outq, tp->t_outq.c_cc); 7241541Srgrimes break; 7251541Srgrimes 7261541Srgrimes case TIOCSIG: 72727770Sjmg if (*(unsigned int *)data >= NSIG || 72827770Sjmg *(unsigned int *)data == 0) 7291541Srgrimes return(EINVAL); 7301541Srgrimes if ((tp->t_lflag&NOFLSH) == 0) 7311541Srgrimes ttyflush(tp, FREAD|FWRITE); 7321541Srgrimes pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 7331541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7341541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7351541Srgrimes ttyinfo(tp); 7361541Srgrimes return(0); 7371541Srgrimes } 73847203Sluoqi } 73947301Sluoqi if (cmd == TIOCEXT) { 74047301Sluoqi /* 74147301Sluoqi * When the EXTPROC bit is being toggled, we need 74247301Sluoqi * to send an TIOCPKT_IOCTL if the packet driver 74347301Sluoqi * is turned on. 74447301Sluoqi */ 74547301Sluoqi if (*(int *)data) { 74647301Sluoqi if (pti->pt_flags & PF_PKT) { 74747301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 74847301Sluoqi ptcwakeup(tp, FREAD); 74947301Sluoqi } 75047301Sluoqi tp->t_lflag |= EXTPROC; 75147301Sluoqi } else { 75247301Sluoqi if ((tp->t_lflag & EXTPROC) && 75347301Sluoqi (pti->pt_flags & PF_PKT)) { 75447301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 75547301Sluoqi ptcwakeup(tp, FREAD); 75647301Sluoqi } 75747301Sluoqi tp->t_lflag &= ~EXTPROC; 75847301Sluoqi } 75947301Sluoqi return(0); 76047301Sluoqi } 7611541Srgrimes error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 76231577Sbde if (error == ENOIOCTL) 7631541Srgrimes error = ttioctl(tp, cmd, data, flag); 76431577Sbde if (error == ENOIOCTL) { 7651541Srgrimes if (pti->pt_flags & PF_UCNTL && 7661541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7671541Srgrimes if (cmd & 0xff) { 7681541Srgrimes pti->pt_ucntl = (u_char)cmd; 7691541Srgrimes ptcwakeup(tp, FREAD); 7701541Srgrimes } 7711541Srgrimes return (0); 7721541Srgrimes } 7731541Srgrimes error = ENOTTY; 7741541Srgrimes } 7751541Srgrimes /* 7761541Srgrimes * If external processing and packet mode send ioctl packet. 7771541Srgrimes */ 7781541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7791541Srgrimes switch(cmd) { 7801541Srgrimes case TIOCSETA: 7811541Srgrimes case TIOCSETAW: 7821541Srgrimes case TIOCSETAF: 7831541Srgrimes#ifdef COMPAT_43 7841541Srgrimes case TIOCSETP: 7851541Srgrimes case TIOCSETN: 7861541Srgrimes#endif 7871541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7881541Srgrimes case TIOCSETC: 7891541Srgrimes case TIOCSLTC: 7901541Srgrimes case TIOCLBIS: 7911541Srgrimes case TIOCLBIC: 7921541Srgrimes case TIOCLSET: 7931541Srgrimes#endif 7941541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7951541Srgrimes ptcwakeup(tp, FREAD); 7961541Srgrimes default: 7971541Srgrimes break; 7981541Srgrimes } 7991541Srgrimes } 8008876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 8011541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 8021541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 8031541Srgrimes if (stop) { 8041541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 8051541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 8061541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 8071541Srgrimes ptcwakeup(tp, FREAD); 8081541Srgrimes } 8091541Srgrimes } else { 8101541Srgrimes if (!stop) { 8111541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 8121541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 8131541Srgrimes pti->pt_flags |= PF_NOSTOP; 8141541Srgrimes ptcwakeup(tp, FREAD); 8151541Srgrimes } 8161541Srgrimes } 8171541Srgrimes return (error); 8181541Srgrimes} 81912517Sjulian 82012517Sjulian 82129506Sbdestatic void ptc_drvinit __P((void *unused)); 82249536Sphk 82312675Sjulianstatic void 82429506Sbdeptc_drvinit(unused) 82529506Sbde void *unused; 82612517Sjulian{ 82750254Sphk cdevsw_add(&pts_cdevsw); 82850254Sphk cdevsw_add(&ptc_cdevsw); 82950254Sphk /* XXX: Gross hack for DEVFS */ 83050254Sphk ptyinit(0); 83112517Sjulian} 83212517Sjulian 83312517SjulianSYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 834