pty.c revision 77176
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 77176 2001-05-25 13:23:42Z phk $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes/* 381541Srgrimes * Pseudo-teletype Driver 391541Srgrimes * (Actually two drivers, requiring two entries in 'cdevsw') 401541Srgrimes */ 4131778Seivind#include "opt_compat.h" 421541Srgrimes#include <sys/param.h> 431541Srgrimes#include <sys/systm.h> 4424207Sbde#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 4524207Sbde#include <sys/ioctl_compat.h> 4624207Sbde#endif 471541Srgrimes#include <sys/proc.h> 481541Srgrimes#include <sys/tty.h> 491541Srgrimes#include <sys/conf.h> 5024131Sbde#include <sys/fcntl.h> 5129354Speter#include <sys/poll.h> 521541Srgrimes#include <sys/kernel.h> 531541Srgrimes#include <sys/vnode.h> 543308Sphk#include <sys/signalvar.h> 5549536Sphk#include <sys/malloc.h> 561541Srgrimes 5769774Sphkstatic MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 5812517Sjulian 5912819Sphkstatic void ptsstart __P((struct tty *tp)); 6051654Sphkstatic void ptsstop __P((struct tty *tp, int rw)); 6112819Sphkstatic void ptcwakeup __P((struct tty *tp, int flag)); 6277176Sphkstatic dev_t ptyinit __P((dev_t cdev)); 6311789Sbde 6412675Sjulianstatic d_open_t ptsopen; 6512675Sjulianstatic d_close_t ptsclose; 6612675Sjulianstatic d_read_t ptsread; 6712675Sjulianstatic d_write_t ptswrite; 6812675Sjulianstatic d_ioctl_t ptyioctl; 6912675Sjulianstatic d_open_t ptcopen; 7012675Sjulianstatic d_close_t ptcclose; 7112675Sjulianstatic d_read_t ptcread; 7212675Sjulianstatic d_write_t ptcwrite; 7329354Speterstatic d_poll_t ptcpoll; 7412675Sjulian 7538485Sbde#define CDEV_MAJOR_S 5 7647625Sphkstatic struct cdevsw pts_cdevsw = { 7747625Sphk /* open */ ptsopen, 7847625Sphk /* close */ ptsclose, 7947625Sphk /* read */ ptsread, 8047625Sphk /* write */ ptswrite, 8147625Sphk /* ioctl */ ptyioctl, 8251654Sphk /* poll */ ttypoll, 8347625Sphk /* mmap */ nommap, 8447625Sphk /* strategy */ nostrategy, 8547625Sphk /* name */ "pts", 8647625Sphk /* maj */ CDEV_MAJOR_S, 8747625Sphk /* dump */ nodump, 8847625Sphk /* psize */ nopsize, 8972521Sjlemon /* flags */ D_TTY | D_KQFILTER, 9072521Sjlemon /* kqfilter */ ttykqfilter, 9138485Sbde}; 9212675Sjulian 9338485Sbde#define CDEV_MAJOR_C 6 9447625Sphkstatic struct cdevsw ptc_cdevsw = { 9547625Sphk /* open */ ptcopen, 9647625Sphk /* close */ ptcclose, 9747625Sphk /* read */ ptcread, 9847625Sphk /* write */ ptcwrite, 9947625Sphk /* ioctl */ ptyioctl, 10047625Sphk /* poll */ ptcpoll, 10147625Sphk /* mmap */ nommap, 10247625Sphk /* strategy */ nostrategy, 10347625Sphk /* name */ "ptc", 10447625Sphk /* maj */ CDEV_MAJOR_C, 10547625Sphk /* dump */ nodump, 10647625Sphk /* psize */ nopsize, 10772521Sjlemon /* flags */ D_TTY | D_KQFILTER, 10872521Sjlemon /* kqfilter */ ttykqfilter, 10938485Sbde}; 11012675Sjulian 1111541Srgrimes#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 1121541Srgrimes 11349536Sphkstruct pt_ioctl { 1141541Srgrimes int pt_flags; 1151541Srgrimes struct selinfo pt_selr, pt_selw; 1161541Srgrimes u_char pt_send; 1171541Srgrimes u_char pt_ucntl; 11849536Sphk struct tty pt_tty; 11950092Sjulian dev_t devs, devc; 12057070Srwatson struct prison *pt_prison; 12149536Sphk}; 1221541Srgrimes 1231541Srgrimes#define PF_PKT 0x08 /* packet mode */ 1241541Srgrimes#define PF_STOPPED 0x10 /* user told stopped */ 1251541Srgrimes#define PF_REMOTE 0x20 /* remote and flow controlled input */ 1261541Srgrimes#define PF_NOSTOP 0x40 1271541Srgrimes#define PF_UCNTL 0x80 /* user control mode */ 1281541Srgrimes 12977176Sphkstatic char *names = "pqrsPQRS"; 1301541Srgrimes/* 13149536Sphk * This function creates and initializes a pts/ptc pair 1321541Srgrimes * 13349536Sphk * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 13449536Sphk * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 13549536Sphk * 13649536Sphk * XXX: define and add mapping of upper minor bits to allow more 13749536Sphk * than 256 ptys. 1381541Srgrimes */ 13964880Sphkstatic dev_t 14077176Sphkptyinit(dev_t devc) 1411541Srgrimes{ 14277176Sphk dev_t devs; 14349536Sphk struct pt_ioctl *pt; 14477176Sphk int n; 1451541Srgrimes 14677176Sphk devc->si_flags &= ~SI_CHEAPCLONE; 14777176Sphk n = minor(devc); 14849536Sphk /* For now we only map the lower 8 bits of the minor */ 14949536Sphk if (n & ~0xff) 15064880Sphk return (NODEV); 15149536Sphk 15269781Sdwmalone pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 15350092Sjulian pt->devs = devs = make_dev(&pts_cdevsw, n, 15466067Sphk UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 15577176Sphk pt->devc = devc; 15649536Sphk 15749536Sphk devs->si_drv1 = devc->si_drv1 = pt; 15850652Sphk devs->si_tty = devc->si_tty = &pt->pt_tty; 15949540Sphk ttyregister(&pt->pt_tty); 16064880Sphk return (devc); 16116322Sgpalmer} 1621541Srgrimes 1631541Srgrimes/*ARGSUSED*/ 16412675Sjulianstatic int 1651541Srgrimesptsopen(dev, flag, devtype, p) 1661541Srgrimes dev_t dev; 1671541Srgrimes int flag, devtype; 1681541Srgrimes struct proc *p; 1691541Srgrimes{ 1701541Srgrimes register struct tty *tp; 1711541Srgrimes int error; 17257070Srwatson struct pt_ioctl *pti; 1731541Srgrimes 17449536Sphk if (!dev->si_drv1) 17549536Sphk return(ENXIO); 17657070Srwatson pti = dev->si_drv1; 17750652Sphk tp = dev->si_tty; 1781541Srgrimes if ((tp->t_state & TS_ISOPEN) == 0) { 1791541Srgrimes ttychars(tp); /* Set up default chars */ 1801541Srgrimes tp->t_iflag = TTYDEF_IFLAG; 1811541Srgrimes tp->t_oflag = TTYDEF_OFLAG; 1821541Srgrimes tp->t_lflag = TTYDEF_LFLAG; 1831541Srgrimes tp->t_cflag = TTYDEF_CFLAG; 1841541Srgrimes tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 18557070Srwatson } else if (tp->t_state & TS_XCLUDE && suser(p)) { 1861541Srgrimes return (EBUSY); 18772786Srwatson } else if (pti->pt_prison != p->p_ucred->cr_prison) { 18857070Srwatson return (EBUSY); 18957070Srwatson } 1901541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 1919824Sbde (void)(*linesw[tp->t_line].l_modem)(tp, 1); 1921541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 1931541Srgrimes if (flag&FNONBLOCK) 1941541Srgrimes break; 1959639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1969624Sbde "ptsopn", 0); 1973308Sphk if (error) 1981541Srgrimes return (error); 1991541Srgrimes } 2001541Srgrimes error = (*linesw[tp->t_line].l_open)(dev, tp); 2017724Sache if (error == 0) 2027724Sache ptcwakeup(tp, FREAD|FWRITE); 2031541Srgrimes return (error); 2041541Srgrimes} 2051541Srgrimes 20612675Sjulianstatic int 2071541Srgrimesptsclose(dev, flag, mode, p) 2081541Srgrimes dev_t dev; 2091541Srgrimes int flag, mode; 2101541Srgrimes struct proc *p; 2111541Srgrimes{ 2121541Srgrimes register struct tty *tp; 2131541Srgrimes int err; 2141541Srgrimes 21550652Sphk tp = dev->si_tty; 2161541Srgrimes err = (*linesw[tp->t_line].l_close)(tp, flag); 2177730Sache ptsstop(tp, FREAD|FWRITE); 2187724Sache (void) ttyclose(tp); 2191541Srgrimes return (err); 2201541Srgrimes} 2211541Srgrimes 22212675Sjulianstatic int 2231541Srgrimesptsread(dev, uio, flag) 2241541Srgrimes dev_t dev; 2251541Srgrimes struct uio *uio; 2261541Srgrimes int flag; 2271541Srgrimes{ 2281541Srgrimes struct proc *p = curproc; 22950652Sphk register struct tty *tp = dev->si_tty; 23049536Sphk register struct pt_ioctl *pti = dev->si_drv1; 2311541Srgrimes int error = 0; 2321541Srgrimes 2331541Srgrimesagain: 2341541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2351541Srgrimes while (isbackground(p, tp)) { 23651791Smarcel if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 23751791Smarcel SIGISMEMBER(p->p_sigmask, SIGTTIN) || 23851791Smarcel p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 2391541Srgrimes return (EIO); 2401541Srgrimes pgsignal(p->p_pgrp, SIGTTIN, 1); 2419624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2429624Sbde 0); 2433308Sphk if (error) 2441541Srgrimes return (error); 2451541Srgrimes } 2461541Srgrimes if (tp->t_canq.c_cc == 0) { 2471541Srgrimes if (flag & IO_NDELAY) 2481541Srgrimes return (EWOULDBLOCK); 2499639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2509624Sbde "ptsin", 0); 2513308Sphk if (error) 2521541Srgrimes return (error); 2531541Srgrimes goto again; 2541541Srgrimes } 2551541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2561541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2571541Srgrimes error = EFAULT; 2581541Srgrimes break; 2591541Srgrimes } 2601541Srgrimes if (tp->t_canq.c_cc == 1) 2611541Srgrimes (void) getc(&tp->t_canq); 2621541Srgrimes if (tp->t_canq.c_cc) 2631541Srgrimes return (error); 2641541Srgrimes } else 2651541Srgrimes if (tp->t_oproc) 2661541Srgrimes error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 2671541Srgrimes ptcwakeup(tp, FWRITE); 2681541Srgrimes return (error); 2691541Srgrimes} 2701541Srgrimes 2711541Srgrimes/* 2721541Srgrimes * Write to pseudo-tty. 2731541Srgrimes * Wakeups of controlling tty will happen 2741541Srgrimes * indirectly, when tty driver calls ptsstart. 2751541Srgrimes */ 27612675Sjulianstatic int 2771541Srgrimesptswrite(dev, uio, flag) 2781541Srgrimes dev_t dev; 2791541Srgrimes struct uio *uio; 2801541Srgrimes int flag; 2811541Srgrimes{ 2821541Srgrimes register struct tty *tp; 2831541Srgrimes 28450652Sphk tp = dev->si_tty; 2851541Srgrimes if (tp->t_oproc == 0) 2861541Srgrimes return (EIO); 2871541Srgrimes return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2881541Srgrimes} 2891541Srgrimes 2901541Srgrimes/* 2911541Srgrimes * Start output on pseudo-tty. 2921541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 2931541Srgrimes */ 29412819Sphkstatic void 2951541Srgrimesptsstart(tp) 2961541Srgrimes struct tty *tp; 2971541Srgrimes{ 29849536Sphk register struct pt_ioctl *pti = tp->t_dev->si_drv1; 2991541Srgrimes 3001541Srgrimes if (tp->t_state & TS_TTSTOP) 3011541Srgrimes return; 3021541Srgrimes if (pti->pt_flags & PF_STOPPED) { 3031541Srgrimes pti->pt_flags &= ~PF_STOPPED; 3041541Srgrimes pti->pt_send = TIOCPKT_START; 3051541Srgrimes } 3061541Srgrimes ptcwakeup(tp, FREAD); 3071541Srgrimes} 3081541Srgrimes 30912819Sphkstatic void 3101541Srgrimesptcwakeup(tp, flag) 3111541Srgrimes struct tty *tp; 3121541Srgrimes int flag; 3131541Srgrimes{ 31449536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 3151541Srgrimes 3161541Srgrimes if (flag & FREAD) { 3171541Srgrimes selwakeup(&pti->pt_selr); 3189639Sbde wakeup(TSA_PTC_READ(tp)); 3191541Srgrimes } 3201541Srgrimes if (flag & FWRITE) { 3211541Srgrimes selwakeup(&pti->pt_selw); 3229639Sbde wakeup(TSA_PTC_WRITE(tp)); 3231541Srgrimes } 3241541Srgrimes} 3251541Srgrimes 32612675Sjulianstatic int 3271541Srgrimesptcopen(dev, flag, devtype, p) 3281541Srgrimes dev_t dev; 3291541Srgrimes int flag, devtype; 3301541Srgrimes struct proc *p; 3311541Srgrimes{ 3321541Srgrimes register struct tty *tp; 3331541Srgrimes struct pt_ioctl *pti; 3341541Srgrimes 33549536Sphk if (!dev->si_drv1) 33677176Sphk ptyinit(dev); 33749536Sphk if (!dev->si_drv1) 33849536Sphk return(ENXIO); 33950652Sphk tp = dev->si_tty; 3401541Srgrimes if (tp->t_oproc) 3411541Srgrimes return (EIO); 34259818Sache tp->t_timeout = -1; 3431541Srgrimes tp->t_oproc = ptsstart; 34451654Sphk tp->t_stop = ptsstop; 3451541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 1); 3461541Srgrimes tp->t_lflag &= ~EXTPROC; 34749536Sphk pti = dev->si_drv1; 34872786Srwatson pti->pt_prison = p->p_ucred->cr_prison; 3491541Srgrimes pti->pt_flags = 0; 3501541Srgrimes pti->pt_send = 0; 3511541Srgrimes pti->pt_ucntl = 0; 3521541Srgrimes return (0); 3531541Srgrimes} 3541541Srgrimes 35512675Sjulianstatic int 35610624Sbdeptcclose(dev, flags, fmt, p) 3571541Srgrimes dev_t dev; 35810624Sbde int flags; 35910624Sbde int fmt; 36010624Sbde struct proc *p; 3611541Srgrimes{ 3621541Srgrimes register struct tty *tp; 3631541Srgrimes 36450652Sphk tp = dev->si_tty; 3651541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 0); 3669824Sbde 3679824Sbde /* 3689824Sbde * XXX MDMBUF makes no sense for ptys but would inhibit the above 3699824Sbde * l_modem(). CLOCAL makes sense but isn't supported. Special 3709824Sbde * l_modem()s that ignore carrier drop make no sense for ptys but 3719824Sbde * may be in use because other parts of the line discipline make 3729824Sbde * sense for ptys. Recover by doing everything that a normal 3739824Sbde * ttymodem() would have done except for sending a SIGHUP. 3749824Sbde */ 3759850Sbde if (tp->t_state & TS_ISOPEN) { 3769850Sbde tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 3779850Sbde tp->t_state |= TS_ZOMBIE; 3789850Sbde ttyflush(tp, FREAD | FWRITE); 3799850Sbde } 3809824Sbde 3811541Srgrimes tp->t_oproc = 0; /* mark closed */ 3821541Srgrimes return (0); 3831541Srgrimes} 3841541Srgrimes 38512675Sjulianstatic int 3861541Srgrimesptcread(dev, uio, flag) 3871541Srgrimes dev_t dev; 3881541Srgrimes struct uio *uio; 3891541Srgrimes int flag; 3901541Srgrimes{ 39150652Sphk register struct tty *tp = dev->si_tty; 39249536Sphk struct pt_ioctl *pti = dev->si_drv1; 3931541Srgrimes char buf[BUFSIZ]; 3941541Srgrimes int error = 0, cc; 3951541Srgrimes 3961541Srgrimes /* 3971541Srgrimes * We want to block until the slave 3981541Srgrimes * is open, and there's something to read; 3991541Srgrimes * but if we lost the slave or we're NBIO, 4001541Srgrimes * then return the appropriate error instead. 4011541Srgrimes */ 4021541Srgrimes for (;;) { 4031541Srgrimes if (tp->t_state&TS_ISOPEN) { 4041541Srgrimes if (pti->pt_flags&PF_PKT && pti->pt_send) { 4051541Srgrimes error = ureadc((int)pti->pt_send, uio); 4061541Srgrimes if (error) 4071541Srgrimes return (error); 4081541Srgrimes if (pti->pt_send & TIOCPKT_IOCTL) { 4091541Srgrimes cc = min(uio->uio_resid, 4101541Srgrimes sizeof(tp->t_termios)); 4112807Sbde uiomove((caddr_t)&tp->t_termios, cc, 4122807Sbde uio); 4131541Srgrimes } 4141541Srgrimes pti->pt_send = 0; 4151541Srgrimes return (0); 4161541Srgrimes } 4171541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 4181541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 4191541Srgrimes if (error) 4201541Srgrimes return (error); 4211541Srgrimes pti->pt_ucntl = 0; 4221541Srgrimes return (0); 4231541Srgrimes } 4241541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4251541Srgrimes break; 4261541Srgrimes } 4279824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4281541Srgrimes return (0); /* EOF */ 4291541Srgrimes if (flag & IO_NDELAY) 4301541Srgrimes return (EWOULDBLOCK); 4319639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4323308Sphk if (error) 4331541Srgrimes return (error); 4341541Srgrimes } 4351541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4361541Srgrimes error = ureadc(0, uio); 4371541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4381541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4391541Srgrimes if (cc <= 0) 4401541Srgrimes break; 4411541Srgrimes error = uiomove(buf, cc, uio); 4421541Srgrimes } 4439626Sbde ttwwakeup(tp); 4441541Srgrimes return (error); 4451541Srgrimes} 4461541Srgrimes 44712675Sjulianstatic void 4481541Srgrimesptsstop(tp, flush) 4491541Srgrimes register struct tty *tp; 4501541Srgrimes int flush; 4511541Srgrimes{ 45249536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 4531541Srgrimes int flag; 4541541Srgrimes 4551541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4561541Srgrimes if (flush == 0) { 4571541Srgrimes flush = TIOCPKT_STOP; 4581541Srgrimes pti->pt_flags |= PF_STOPPED; 4591541Srgrimes } else 4601541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4611541Srgrimes pti->pt_send |= flush; 4621541Srgrimes /* change of perspective */ 4631541Srgrimes flag = 0; 4641541Srgrimes if (flush & FREAD) 4651541Srgrimes flag |= FWRITE; 4661541Srgrimes if (flush & FWRITE) 4671541Srgrimes flag |= FREAD; 4681541Srgrimes ptcwakeup(tp, flag); 4691541Srgrimes} 4701541Srgrimes 47112675Sjulianstatic int 47229354Speterptcpoll(dev, events, p) 4731541Srgrimes dev_t dev; 47429354Speter int events; 4751541Srgrimes struct proc *p; 4761541Srgrimes{ 47750652Sphk register struct tty *tp = dev->si_tty; 47849536Sphk struct pt_ioctl *pti = dev->si_drv1; 47929354Speter int revents = 0; 4801541Srgrimes int s; 4811541Srgrimes 4829824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 48329354Speter return (seltrue(dev, events, p) | POLLHUP); 4841541Srgrimes 48529354Speter /* 48629354Speter * Need to block timeouts (ttrstart). 48729354Speter */ 48829354Speter s = spltty(); 4891541Srgrimes 49029354Speter if (events & (POLLIN | POLLRDNORM)) 49129354Speter if ((tp->t_state & TS_ISOPEN) && 49229354Speter ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 49329354Speter ((pti->pt_flags & PF_PKT) && pti->pt_send) || 49429354Speter ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 49529354Speter revents |= events & (POLLIN | POLLRDNORM); 4961541Srgrimes 49729354Speter if (events & (POLLOUT | POLLWRNORM)) 49829354Speter if (tp->t_state & TS_ISOPEN && 49929354Speter ((pti->pt_flags & PF_REMOTE) ? 50029354Speter (tp->t_canq.c_cc == 0) : 50129354Speter ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 50229354Speter (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 50329354Speter revents |= events & (POLLOUT | POLLWRNORM); 5041541Srgrimes 50529354Speter if (events & POLLHUP) 50629354Speter if ((tp->t_state & TS_CARR_ON) == 0) 50729354Speter revents |= POLLHUP; 5081541Srgrimes 50929354Speter if (revents == 0) { 51029354Speter if (events & (POLLIN | POLLRDNORM)) 51129354Speter selrecord(p, &pti->pt_selr); 51229354Speter 51329354Speter if (events & (POLLOUT | POLLWRNORM)) 51429354Speter selrecord(p, &pti->pt_selw); 5151541Srgrimes } 51629354Speter splx(s); 51729354Speter 51829354Speter return (revents); 5191541Srgrimes} 5201541Srgrimes 52112675Sjulianstatic int 5221541Srgrimesptcwrite(dev, uio, flag) 5231541Srgrimes dev_t dev; 5241541Srgrimes register struct uio *uio; 5251541Srgrimes int flag; 5261541Srgrimes{ 52750652Sphk register struct tty *tp = dev->si_tty; 5281549Srgrimes register u_char *cp = 0; 5291541Srgrimes register int cc = 0; 5301541Srgrimes u_char locbuf[BUFSIZ]; 5311541Srgrimes int cnt = 0; 53249536Sphk struct pt_ioctl *pti = dev->si_drv1; 5331541Srgrimes int error = 0; 5341541Srgrimes 5351541Srgrimesagain: 5361541Srgrimes if ((tp->t_state&TS_ISOPEN) == 0) 5371541Srgrimes goto block; 5381541Srgrimes if (pti->pt_flags & PF_REMOTE) { 5391541Srgrimes if (tp->t_canq.c_cc) 5401541Srgrimes goto block; 54111789Sbde while ((uio->uio_resid > 0 || cc > 0) && 54211789Sbde tp->t_canq.c_cc < TTYHOG - 1) { 5431541Srgrimes if (cc == 0) { 5441541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5451541Srgrimes cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 5461541Srgrimes cp = locbuf; 5471541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5481541Srgrimes if (error) 5491541Srgrimes return (error); 5501541Srgrimes /* check again for safety */ 55111789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 55211789Sbde /* adjust as usual */ 55311789Sbde uio->uio_resid += cc; 5541541Srgrimes return (EIO); 55511789Sbde } 5561541Srgrimes } 55715199Sbde if (cc > 0) { 55815199Sbde cc = b_to_q((char *)cp, cc, &tp->t_canq); 55915199Sbde /* 56015199Sbde * XXX we don't guarantee that the canq size 56115199Sbde * is >= TTYHOG, so the above b_to_q() may 56215199Sbde * leave some bytes uncopied. However, space 56315199Sbde * is guaranteed for the null terminator if 56415199Sbde * we don't fail here since (TTYHOG - 1) is 56515199Sbde * not a multiple of CBSIZE. 56615199Sbde */ 56715199Sbde if (cc > 0) 56815199Sbde break; 56915199Sbde } 5701541Srgrimes } 57111789Sbde /* adjust for data copied in but not written */ 57211789Sbde uio->uio_resid += cc; 5731541Srgrimes (void) putc(0, &tp->t_canq); 5741541Srgrimes ttwakeup(tp); 5759639Sbde wakeup(TSA_PTS_READ(tp)); 5761541Srgrimes return (0); 5771541Srgrimes } 57811789Sbde while (uio->uio_resid > 0 || cc > 0) { 5791541Srgrimes if (cc == 0) { 5801541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5811541Srgrimes cp = locbuf; 5821541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5831541Srgrimes if (error) 5841541Srgrimes return (error); 5851541Srgrimes /* check again for safety */ 58611789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 58711789Sbde /* adjust for data copied in but not written */ 58811789Sbde uio->uio_resid += cc; 5891541Srgrimes return (EIO); 59011789Sbde } 5911541Srgrimes } 5921541Srgrimes while (cc > 0) { 5931541Srgrimes if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 5941541Srgrimes (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 5959824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 5961541Srgrimes goto block; 5971541Srgrimes } 5981541Srgrimes (*linesw[tp->t_line].l_rint)(*cp++, tp); 5991541Srgrimes cnt++; 6001541Srgrimes cc--; 6011541Srgrimes } 6021541Srgrimes cc = 0; 6031541Srgrimes } 6041541Srgrimes return (0); 6051541Srgrimesblock: 6061541Srgrimes /* 6071541Srgrimes * Come here to wait for slave to open, for space 60815199Sbde * in outq, or space in rawq, or an empty canq. 6091541Srgrimes */ 61011789Sbde if ((tp->t_state & TS_CONNECTED) == 0) { 61111789Sbde /* adjust for data copied in but not written */ 61211789Sbde uio->uio_resid += cc; 6131541Srgrimes return (EIO); 61411789Sbde } 6151541Srgrimes if (flag & IO_NDELAY) { 6161541Srgrimes /* adjust for data copied in but not written */ 6171541Srgrimes uio->uio_resid += cc; 6181541Srgrimes if (cnt == 0) 6191541Srgrimes return (EWOULDBLOCK); 6201541Srgrimes return (0); 6211541Srgrimes } 6229639Sbde error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 6233308Sphk if (error) { 6241541Srgrimes /* adjust for data copied in but not written */ 6251541Srgrimes uio->uio_resid += cc; 6261541Srgrimes return (error); 6271541Srgrimes } 6281541Srgrimes goto again; 6291541Srgrimes} 6301541Srgrimes 6311541Srgrimes/*ARGSUSED*/ 63212675Sjulianstatic int 6331541Srgrimesptyioctl(dev, cmd, data, flag, p) 6341541Srgrimes dev_t dev; 63536735Sdfr u_long cmd; 6361541Srgrimes caddr_t data; 6371541Srgrimes int flag; 6381541Srgrimes struct proc *p; 6391541Srgrimes{ 64050652Sphk register struct tty *tp = dev->si_tty; 64149536Sphk register struct pt_ioctl *pti = dev->si_drv1; 6421541Srgrimes register u_char *cc = tp->t_cc; 6431541Srgrimes int stop, error; 6441541Srgrimes 64547301Sluoqi if (devsw(dev)->d_open == ptcopen) { 6461541Srgrimes switch (cmd) { 6471541Srgrimes 6481541Srgrimes case TIOCGPGRP: 6491541Srgrimes /* 65033826Sbde * We avoid calling ttioctl on the controller since, 6511541Srgrimes * in that case, tp must be the controlling terminal. 6521541Srgrimes */ 6531541Srgrimes *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 6541541Srgrimes return (0); 6551541Srgrimes 6561541Srgrimes case TIOCPKT: 6571541Srgrimes if (*(int *)data) { 6581541Srgrimes if (pti->pt_flags & PF_UCNTL) 6591541Srgrimes return (EINVAL); 6601541Srgrimes pti->pt_flags |= PF_PKT; 6611541Srgrimes } else 6621541Srgrimes pti->pt_flags &= ~PF_PKT; 6631541Srgrimes return (0); 6641541Srgrimes 6651541Srgrimes case TIOCUCNTL: 6661541Srgrimes if (*(int *)data) { 6671541Srgrimes if (pti->pt_flags & PF_PKT) 6681541Srgrimes return (EINVAL); 6691541Srgrimes pti->pt_flags |= PF_UCNTL; 6701541Srgrimes } else 6711541Srgrimes pti->pt_flags &= ~PF_UCNTL; 6721541Srgrimes return (0); 6731541Srgrimes 6741541Srgrimes case TIOCREMOTE: 6751541Srgrimes if (*(int *)data) 6761541Srgrimes pti->pt_flags |= PF_REMOTE; 6771541Srgrimes else 6781541Srgrimes pti->pt_flags &= ~PF_REMOTE; 6791541Srgrimes ttyflush(tp, FREAD|FWRITE); 6801541Srgrimes return (0); 68147203Sluoqi } 6821541Srgrimes 68347203Sluoqi /* 68447203Sluoqi * The rest of the ioctls shouldn't be called until 68547301Sluoqi * the slave is open. 68647203Sluoqi */ 68747203Sluoqi if ((tp->t_state & TS_ISOPEN) == 0) 68847301Sluoqi return (EAGAIN); 68947203Sluoqi 69047203Sluoqi switch (cmd) { 6911541Srgrimes#ifdef COMPAT_43 6928876Srgrimes case TIOCSETP: 6931541Srgrimes case TIOCSETN: 6941541Srgrimes#endif 6951541Srgrimes case TIOCSETD: 6961541Srgrimes case TIOCSETA: 6971541Srgrimes case TIOCSETAW: 6989858Sache case TIOCSETAF: 69947301Sluoqi /* 70047301Sluoqi * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 70147301Sluoqi * ttywflush(tp) will hang if there are characters in 70247301Sluoqi * the outq. 70347301Sluoqi */ 7041541Srgrimes ndflush(&tp->t_outq, tp->t_outq.c_cc); 7051541Srgrimes break; 7061541Srgrimes 7071541Srgrimes case TIOCSIG: 70827770Sjmg if (*(unsigned int *)data >= NSIG || 70927770Sjmg *(unsigned int *)data == 0) 7101541Srgrimes return(EINVAL); 7111541Srgrimes if ((tp->t_lflag&NOFLSH) == 0) 7121541Srgrimes ttyflush(tp, FREAD|FWRITE); 7131541Srgrimes pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 7141541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7151541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7161541Srgrimes ttyinfo(tp); 7171541Srgrimes return(0); 7181541Srgrimes } 71947203Sluoqi } 72047301Sluoqi if (cmd == TIOCEXT) { 72147301Sluoqi /* 72247301Sluoqi * When the EXTPROC bit is being toggled, we need 72347301Sluoqi * to send an TIOCPKT_IOCTL if the packet driver 72447301Sluoqi * is turned on. 72547301Sluoqi */ 72647301Sluoqi if (*(int *)data) { 72747301Sluoqi if (pti->pt_flags & PF_PKT) { 72847301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 72947301Sluoqi ptcwakeup(tp, FREAD); 73047301Sluoqi } 73147301Sluoqi tp->t_lflag |= EXTPROC; 73247301Sluoqi } else { 73347301Sluoqi if ((tp->t_lflag & EXTPROC) && 73447301Sluoqi (pti->pt_flags & PF_PKT)) { 73547301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 73647301Sluoqi ptcwakeup(tp, FREAD); 73747301Sluoqi } 73847301Sluoqi tp->t_lflag &= ~EXTPROC; 73947301Sluoqi } 74047301Sluoqi return(0); 74147301Sluoqi } 7421541Srgrimes error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 74331577Sbde if (error == ENOIOCTL) 7441541Srgrimes error = ttioctl(tp, cmd, data, flag); 74531577Sbde if (error == ENOIOCTL) { 7461541Srgrimes if (pti->pt_flags & PF_UCNTL && 7471541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7481541Srgrimes if (cmd & 0xff) { 7491541Srgrimes pti->pt_ucntl = (u_char)cmd; 7501541Srgrimes ptcwakeup(tp, FREAD); 7511541Srgrimes } 7521541Srgrimes return (0); 7531541Srgrimes } 7541541Srgrimes error = ENOTTY; 7551541Srgrimes } 7561541Srgrimes /* 7571541Srgrimes * If external processing and packet mode send ioctl packet. 7581541Srgrimes */ 7591541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7601541Srgrimes switch(cmd) { 7611541Srgrimes case TIOCSETA: 7621541Srgrimes case TIOCSETAW: 7631541Srgrimes case TIOCSETAF: 7641541Srgrimes#ifdef COMPAT_43 7651541Srgrimes case TIOCSETP: 7661541Srgrimes case TIOCSETN: 7671541Srgrimes#endif 7681541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7691541Srgrimes case TIOCSETC: 7701541Srgrimes case TIOCSLTC: 7711541Srgrimes case TIOCLBIS: 7721541Srgrimes case TIOCLBIC: 7731541Srgrimes case TIOCLSET: 7741541Srgrimes#endif 7751541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7761541Srgrimes ptcwakeup(tp, FREAD); 7771541Srgrimes default: 7781541Srgrimes break; 7791541Srgrimes } 7801541Srgrimes } 7818876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 7821541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 7831541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 7841541Srgrimes if (stop) { 7851541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 7861541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 7871541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 7881541Srgrimes ptcwakeup(tp, FREAD); 7891541Srgrimes } 7901541Srgrimes } else { 7911541Srgrimes if (!stop) { 7921541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 7931541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 7941541Srgrimes pti->pt_flags |= PF_NOSTOP; 7951541Srgrimes ptcwakeup(tp, FREAD); 7961541Srgrimes } 7971541Srgrimes } 7981541Srgrimes return (error); 7991541Srgrimes} 80012517Sjulian 80112517Sjulian 80229506Sbdestatic void ptc_drvinit __P((void *unused)); 80349536Sphk 80464880Sphkstatic void pty_clone __P((void *arg, char *name, int namelen, dev_t *dev)); 80564880Sphk 80612675Sjulianstatic void 80764880Sphkpty_clone(arg, name, namelen, dev) 80864880Sphk void *arg; 80964880Sphk char *name; 81064880Sphk int namelen; 81164880Sphk dev_t *dev; 81264880Sphk{ 81364880Sphk int u; 81464880Sphk 81564880Sphk if (*dev != NODEV) 81664880Sphk return; 81764880Sphk if (bcmp(name, "pty", 3) != 0) 81864880Sphk return; 81964880Sphk if (name[5] != '\0') 82064880Sphk return; 82164880Sphk switch (name[3]) { 82264880Sphk case 'p': u = 0; break; 82364880Sphk case 'q': u = 32; break; 82464880Sphk case 'r': u = 64; break; 82564880Sphk case 's': u = 96; break; 82664880Sphk case 'P': u = 128; break; 82764880Sphk case 'Q': u = 160; break; 82864880Sphk case 'R': u = 192; break; 82964880Sphk case 'S': u = 224; break; 83064880Sphk default: return; 83164880Sphk } 83264880Sphk if (name[4] >= '0' && name[4] <= '9') 83364880Sphk u += name[4] - '0'; 83464880Sphk else if (name[4] >= 'a' && name[4] <= 'v') 83564880Sphk u += name[4] - 'a' + 10; 83664880Sphk else 83764880Sphk return; 83877176Sphk *dev = make_dev(&ptc_cdevsw, u, 83977176Sphk UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 84077176Sphk (*dev)->si_flags |= SI_CHEAPCLONE; 84164880Sphk return; 84264880Sphk} 84364880Sphk 84464880Sphkstatic void 84529506Sbdeptc_drvinit(unused) 84629506Sbde void *unused; 84712517Sjulian{ 84865374Sphk EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 84953483Sjkh cdevsw_add(&pts_cdevsw); 85053483Sjkh cdevsw_add(&ptc_cdevsw); 85112517Sjulian} 85212517Sjulian 85312517SjulianSYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 854