pty.c revision 66067
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 66067 2000-09-19 10:28:44Z 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 5749536SphkMALLOC_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)); 6264880Sphkstatic dev_t ptyinit __P((int n)); 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, 8947625Sphk /* flags */ D_TTY, 9047625Sphk /* bmaj */ -1 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, 10747625Sphk /* flags */ D_TTY, 10847625Sphk /* bmaj */ -1 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 1291541Srgrimes/* 13049536Sphk * This function creates and initializes a pts/ptc pair 1311541Srgrimes * 13249536Sphk * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 13349536Sphk * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 13449536Sphk * 13549536Sphk * XXX: define and add mapping of upper minor bits to allow more 13649536Sphk * than 256 ptys. 1371541Srgrimes */ 13864880Sphkstatic dev_t 13949536Sphkptyinit(n) 1401541Srgrimes int n; 1411541Srgrimes{ 14249536Sphk dev_t devs, devc; 14349536Sphk char *names = "pqrsPQRS"; 14449536Sphk struct pt_ioctl *pt; 1451541Srgrimes 14649536Sphk /* For now we only map the lower 8 bits of the minor */ 14749536Sphk if (n & ~0xff) 14864880Sphk return (NODEV); 14949536Sphk 15050092Sjulian pt = malloc(sizeof(*pt), M_PTY, M_WAITOK); 15150092Sjulian bzero(pt, sizeof(*pt)); 15250092Sjulian pt->devs = devs = make_dev(&pts_cdevsw, n, 15366067Sphk UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 15450092Sjulian pt->devc = devc = make_dev(&ptc_cdevsw, n, 15566067Sphk UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[n / 32], n % 32); 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 ptyinit(minor(dev)); 17649536Sphk if (!dev->si_drv1) 17749536Sphk return(ENXIO); 17857070Srwatson pti = dev->si_drv1; 17950652Sphk tp = dev->si_tty; 1801541Srgrimes if ((tp->t_state & TS_ISOPEN) == 0) { 1811541Srgrimes ttychars(tp); /* Set up default chars */ 1821541Srgrimes tp->t_iflag = TTYDEF_IFLAG; 1831541Srgrimes tp->t_oflag = TTYDEF_OFLAG; 1841541Srgrimes tp->t_lflag = TTYDEF_LFLAG; 1851541Srgrimes tp->t_cflag = TTYDEF_CFLAG; 1861541Srgrimes tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 18757070Srwatson } else if (tp->t_state & TS_XCLUDE && suser(p)) { 1881541Srgrimes return (EBUSY); 18957070Srwatson } else if (pti->pt_prison != p->p_prison) { 19057070Srwatson return (EBUSY); 19157070Srwatson } 1921541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 1939824Sbde (void)(*linesw[tp->t_line].l_modem)(tp, 1); 1941541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 1951541Srgrimes if (flag&FNONBLOCK) 1961541Srgrimes break; 1979639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1989624Sbde "ptsopn", 0); 1993308Sphk if (error) 2001541Srgrimes return (error); 2011541Srgrimes } 2021541Srgrimes error = (*linesw[tp->t_line].l_open)(dev, tp); 2037724Sache if (error == 0) 2047724Sache ptcwakeup(tp, FREAD|FWRITE); 2051541Srgrimes return (error); 2061541Srgrimes} 2071541Srgrimes 20812675Sjulianstatic int 2091541Srgrimesptsclose(dev, flag, mode, p) 2101541Srgrimes dev_t dev; 2111541Srgrimes int flag, mode; 2121541Srgrimes struct proc *p; 2131541Srgrimes{ 2141541Srgrimes register struct tty *tp; 2151541Srgrimes int err; 2161541Srgrimes 21750652Sphk tp = dev->si_tty; 2181541Srgrimes err = (*linesw[tp->t_line].l_close)(tp, flag); 2197730Sache ptsstop(tp, FREAD|FWRITE); 2207724Sache (void) ttyclose(tp); 2211541Srgrimes return (err); 2221541Srgrimes} 2231541Srgrimes 22412675Sjulianstatic int 2251541Srgrimesptsread(dev, uio, flag) 2261541Srgrimes dev_t dev; 2271541Srgrimes struct uio *uio; 2281541Srgrimes int flag; 2291541Srgrimes{ 2301541Srgrimes struct proc *p = curproc; 23150652Sphk register struct tty *tp = dev->si_tty; 23249536Sphk register struct pt_ioctl *pti = dev->si_drv1; 2331541Srgrimes int error = 0; 2341541Srgrimes 2351541Srgrimesagain: 2361541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2371541Srgrimes while (isbackground(p, tp)) { 23851791Smarcel if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 23951791Smarcel SIGISMEMBER(p->p_sigmask, SIGTTIN) || 24051791Smarcel p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 2411541Srgrimes return (EIO); 2421541Srgrimes pgsignal(p->p_pgrp, SIGTTIN, 1); 2439624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2449624Sbde 0); 2453308Sphk if (error) 2461541Srgrimes return (error); 2471541Srgrimes } 2481541Srgrimes if (tp->t_canq.c_cc == 0) { 2491541Srgrimes if (flag & IO_NDELAY) 2501541Srgrimes return (EWOULDBLOCK); 2519639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2529624Sbde "ptsin", 0); 2533308Sphk if (error) 2541541Srgrimes return (error); 2551541Srgrimes goto again; 2561541Srgrimes } 2571541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2581541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2591541Srgrimes error = EFAULT; 2601541Srgrimes break; 2611541Srgrimes } 2621541Srgrimes if (tp->t_canq.c_cc == 1) 2631541Srgrimes (void) getc(&tp->t_canq); 2641541Srgrimes if (tp->t_canq.c_cc) 2651541Srgrimes return (error); 2661541Srgrimes } else 2671541Srgrimes if (tp->t_oproc) 2681541Srgrimes error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 2691541Srgrimes ptcwakeup(tp, FWRITE); 2701541Srgrimes return (error); 2711541Srgrimes} 2721541Srgrimes 2731541Srgrimes/* 2741541Srgrimes * Write to pseudo-tty. 2751541Srgrimes * Wakeups of controlling tty will happen 2761541Srgrimes * indirectly, when tty driver calls ptsstart. 2771541Srgrimes */ 27812675Sjulianstatic int 2791541Srgrimesptswrite(dev, uio, flag) 2801541Srgrimes dev_t dev; 2811541Srgrimes struct uio *uio; 2821541Srgrimes int flag; 2831541Srgrimes{ 2841541Srgrimes register struct tty *tp; 2851541Srgrimes 28650652Sphk tp = dev->si_tty; 2871541Srgrimes if (tp->t_oproc == 0) 2881541Srgrimes return (EIO); 2891541Srgrimes return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2901541Srgrimes} 2911541Srgrimes 2921541Srgrimes/* 2931541Srgrimes * Start output on pseudo-tty. 2941541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 2951541Srgrimes */ 29612819Sphkstatic void 2971541Srgrimesptsstart(tp) 2981541Srgrimes struct tty *tp; 2991541Srgrimes{ 30049536Sphk register struct pt_ioctl *pti = tp->t_dev->si_drv1; 3011541Srgrimes 3021541Srgrimes if (tp->t_state & TS_TTSTOP) 3031541Srgrimes return; 3041541Srgrimes if (pti->pt_flags & PF_STOPPED) { 3051541Srgrimes pti->pt_flags &= ~PF_STOPPED; 3061541Srgrimes pti->pt_send = TIOCPKT_START; 3071541Srgrimes } 3081541Srgrimes ptcwakeup(tp, FREAD); 3091541Srgrimes} 3101541Srgrimes 31112819Sphkstatic void 3121541Srgrimesptcwakeup(tp, flag) 3131541Srgrimes struct tty *tp; 3141541Srgrimes int flag; 3151541Srgrimes{ 31649536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 3171541Srgrimes 3181541Srgrimes if (flag & FREAD) { 3191541Srgrimes selwakeup(&pti->pt_selr); 3209639Sbde wakeup(TSA_PTC_READ(tp)); 3211541Srgrimes } 3221541Srgrimes if (flag & FWRITE) { 3231541Srgrimes selwakeup(&pti->pt_selw); 3249639Sbde wakeup(TSA_PTC_WRITE(tp)); 3251541Srgrimes } 3261541Srgrimes} 3271541Srgrimes 32812675Sjulianstatic int 3291541Srgrimesptcopen(dev, flag, devtype, p) 3301541Srgrimes dev_t dev; 3311541Srgrimes int flag, devtype; 3321541Srgrimes struct proc *p; 3331541Srgrimes{ 3341541Srgrimes register struct tty *tp; 3351541Srgrimes struct pt_ioctl *pti; 3361541Srgrimes 33749536Sphk if (!dev->si_drv1) 33849536Sphk ptyinit(minor(dev)); 33949536Sphk if (!dev->si_drv1) 34049536Sphk return(ENXIO); 34150652Sphk tp = dev->si_tty; 3421541Srgrimes if (tp->t_oproc) 3431541Srgrimes return (EIO); 34459818Sache tp->t_timeout = -1; 3451541Srgrimes tp->t_oproc = ptsstart; 34651654Sphk tp->t_stop = ptsstop; 3471541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 1); 3481541Srgrimes tp->t_lflag &= ~EXTPROC; 34949536Sphk pti = dev->si_drv1; 35057070Srwatson pti->pt_prison = p->p_prison; 3511541Srgrimes pti->pt_flags = 0; 3521541Srgrimes pti->pt_send = 0; 3531541Srgrimes pti->pt_ucntl = 0; 3541541Srgrimes return (0); 3551541Srgrimes} 3561541Srgrimes 35712675Sjulianstatic int 35810624Sbdeptcclose(dev, flags, fmt, p) 3591541Srgrimes dev_t dev; 36010624Sbde int flags; 36110624Sbde int fmt; 36210624Sbde struct proc *p; 3631541Srgrimes{ 3641541Srgrimes register struct tty *tp; 3651541Srgrimes 36650652Sphk tp = dev->si_tty; 3671541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 0); 3689824Sbde 3699824Sbde /* 3709824Sbde * XXX MDMBUF makes no sense for ptys but would inhibit the above 3719824Sbde * l_modem(). CLOCAL makes sense but isn't supported. Special 3729824Sbde * l_modem()s that ignore carrier drop make no sense for ptys but 3739824Sbde * may be in use because other parts of the line discipline make 3749824Sbde * sense for ptys. Recover by doing everything that a normal 3759824Sbde * ttymodem() would have done except for sending a SIGHUP. 3769824Sbde */ 3779850Sbde if (tp->t_state & TS_ISOPEN) { 3789850Sbde tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 3799850Sbde tp->t_state |= TS_ZOMBIE; 3809850Sbde ttyflush(tp, FREAD | FWRITE); 3819850Sbde } 3829824Sbde 3831541Srgrimes tp->t_oproc = 0; /* mark closed */ 3841541Srgrimes return (0); 3851541Srgrimes} 3861541Srgrimes 38712675Sjulianstatic int 3881541Srgrimesptcread(dev, uio, flag) 3891541Srgrimes dev_t dev; 3901541Srgrimes struct uio *uio; 3911541Srgrimes int flag; 3921541Srgrimes{ 39350652Sphk register struct tty *tp = dev->si_tty; 39449536Sphk struct pt_ioctl *pti = dev->si_drv1; 3951541Srgrimes char buf[BUFSIZ]; 3961541Srgrimes int error = 0, cc; 3971541Srgrimes 3981541Srgrimes /* 3991541Srgrimes * We want to block until the slave 4001541Srgrimes * is open, and there's something to read; 4011541Srgrimes * but if we lost the slave or we're NBIO, 4021541Srgrimes * then return the appropriate error instead. 4031541Srgrimes */ 4041541Srgrimes for (;;) { 4051541Srgrimes if (tp->t_state&TS_ISOPEN) { 4061541Srgrimes if (pti->pt_flags&PF_PKT && pti->pt_send) { 4071541Srgrimes error = ureadc((int)pti->pt_send, uio); 4081541Srgrimes if (error) 4091541Srgrimes return (error); 4101541Srgrimes if (pti->pt_send & TIOCPKT_IOCTL) { 4111541Srgrimes cc = min(uio->uio_resid, 4121541Srgrimes sizeof(tp->t_termios)); 4132807Sbde uiomove((caddr_t)&tp->t_termios, cc, 4142807Sbde uio); 4151541Srgrimes } 4161541Srgrimes pti->pt_send = 0; 4171541Srgrimes return (0); 4181541Srgrimes } 4191541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 4201541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 4211541Srgrimes if (error) 4221541Srgrimes return (error); 4231541Srgrimes pti->pt_ucntl = 0; 4241541Srgrimes return (0); 4251541Srgrimes } 4261541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4271541Srgrimes break; 4281541Srgrimes } 4299824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4301541Srgrimes return (0); /* EOF */ 4311541Srgrimes if (flag & IO_NDELAY) 4321541Srgrimes return (EWOULDBLOCK); 4339639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4343308Sphk if (error) 4351541Srgrimes return (error); 4361541Srgrimes } 4371541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4381541Srgrimes error = ureadc(0, uio); 4391541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4401541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4411541Srgrimes if (cc <= 0) 4421541Srgrimes break; 4431541Srgrimes error = uiomove(buf, cc, uio); 4441541Srgrimes } 4459626Sbde ttwwakeup(tp); 4461541Srgrimes return (error); 4471541Srgrimes} 4481541Srgrimes 44912675Sjulianstatic void 4501541Srgrimesptsstop(tp, flush) 4511541Srgrimes register struct tty *tp; 4521541Srgrimes int flush; 4531541Srgrimes{ 45449536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 4551541Srgrimes int flag; 4561541Srgrimes 4571541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4581541Srgrimes if (flush == 0) { 4591541Srgrimes flush = TIOCPKT_STOP; 4601541Srgrimes pti->pt_flags |= PF_STOPPED; 4611541Srgrimes } else 4621541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4631541Srgrimes pti->pt_send |= flush; 4641541Srgrimes /* change of perspective */ 4651541Srgrimes flag = 0; 4661541Srgrimes if (flush & FREAD) 4671541Srgrimes flag |= FWRITE; 4681541Srgrimes if (flush & FWRITE) 4691541Srgrimes flag |= FREAD; 4701541Srgrimes ptcwakeup(tp, flag); 4711541Srgrimes} 4721541Srgrimes 47312675Sjulianstatic int 47429354Speterptcpoll(dev, events, p) 4751541Srgrimes dev_t dev; 47629354Speter int events; 4771541Srgrimes struct proc *p; 4781541Srgrimes{ 47950652Sphk register struct tty *tp = dev->si_tty; 48049536Sphk struct pt_ioctl *pti = dev->si_drv1; 48129354Speter int revents = 0; 4821541Srgrimes int s; 4831541Srgrimes 4849824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 48529354Speter return (seltrue(dev, events, p) | POLLHUP); 4861541Srgrimes 48729354Speter /* 48829354Speter * Need to block timeouts (ttrstart). 48929354Speter */ 49029354Speter s = spltty(); 4911541Srgrimes 49229354Speter if (events & (POLLIN | POLLRDNORM)) 49329354Speter if ((tp->t_state & TS_ISOPEN) && 49429354Speter ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 49529354Speter ((pti->pt_flags & PF_PKT) && pti->pt_send) || 49629354Speter ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 49729354Speter revents |= events & (POLLIN | POLLRDNORM); 4981541Srgrimes 49929354Speter if (events & (POLLOUT | POLLWRNORM)) 50029354Speter if (tp->t_state & TS_ISOPEN && 50129354Speter ((pti->pt_flags & PF_REMOTE) ? 50229354Speter (tp->t_canq.c_cc == 0) : 50329354Speter ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 50429354Speter (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 50529354Speter revents |= events & (POLLOUT | POLLWRNORM); 5061541Srgrimes 50729354Speter if (events & POLLHUP) 50829354Speter if ((tp->t_state & TS_CARR_ON) == 0) 50929354Speter revents |= POLLHUP; 5101541Srgrimes 51129354Speter if (revents == 0) { 51229354Speter if (events & (POLLIN | POLLRDNORM)) 51329354Speter selrecord(p, &pti->pt_selr); 51429354Speter 51529354Speter if (events & (POLLOUT | POLLWRNORM)) 51629354Speter selrecord(p, &pti->pt_selw); 5171541Srgrimes } 51829354Speter splx(s); 51929354Speter 52029354Speter return (revents); 5211541Srgrimes} 5221541Srgrimes 52312675Sjulianstatic int 5241541Srgrimesptcwrite(dev, uio, flag) 5251541Srgrimes dev_t dev; 5261541Srgrimes register struct uio *uio; 5271541Srgrimes int flag; 5281541Srgrimes{ 52950652Sphk register struct tty *tp = dev->si_tty; 5301549Srgrimes register u_char *cp = 0; 5311541Srgrimes register int cc = 0; 5321541Srgrimes u_char locbuf[BUFSIZ]; 5331541Srgrimes int cnt = 0; 53449536Sphk struct pt_ioctl *pti = dev->si_drv1; 5351541Srgrimes int error = 0; 5361541Srgrimes 5371541Srgrimesagain: 5381541Srgrimes if ((tp->t_state&TS_ISOPEN) == 0) 5391541Srgrimes goto block; 5401541Srgrimes if (pti->pt_flags & PF_REMOTE) { 5411541Srgrimes if (tp->t_canq.c_cc) 5421541Srgrimes goto block; 54311789Sbde while ((uio->uio_resid > 0 || cc > 0) && 54411789Sbde tp->t_canq.c_cc < TTYHOG - 1) { 5451541Srgrimes if (cc == 0) { 5461541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5471541Srgrimes cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 5481541Srgrimes cp = locbuf; 5491541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5501541Srgrimes if (error) 5511541Srgrimes return (error); 5521541Srgrimes /* check again for safety */ 55311789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 55411789Sbde /* adjust as usual */ 55511789Sbde uio->uio_resid += cc; 5561541Srgrimes return (EIO); 55711789Sbde } 5581541Srgrimes } 55915199Sbde if (cc > 0) { 56015199Sbde cc = b_to_q((char *)cp, cc, &tp->t_canq); 56115199Sbde /* 56215199Sbde * XXX we don't guarantee that the canq size 56315199Sbde * is >= TTYHOG, so the above b_to_q() may 56415199Sbde * leave some bytes uncopied. However, space 56515199Sbde * is guaranteed for the null terminator if 56615199Sbde * we don't fail here since (TTYHOG - 1) is 56715199Sbde * not a multiple of CBSIZE. 56815199Sbde */ 56915199Sbde if (cc > 0) 57015199Sbde break; 57115199Sbde } 5721541Srgrimes } 57311789Sbde /* adjust for data copied in but not written */ 57411789Sbde uio->uio_resid += cc; 5751541Srgrimes (void) putc(0, &tp->t_canq); 5761541Srgrimes ttwakeup(tp); 5779639Sbde wakeup(TSA_PTS_READ(tp)); 5781541Srgrimes return (0); 5791541Srgrimes } 58011789Sbde while (uio->uio_resid > 0 || cc > 0) { 5811541Srgrimes if (cc == 0) { 5821541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5831541Srgrimes cp = locbuf; 5841541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5851541Srgrimes if (error) 5861541Srgrimes return (error); 5871541Srgrimes /* check again for safety */ 58811789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 58911789Sbde /* adjust for data copied in but not written */ 59011789Sbde uio->uio_resid += cc; 5911541Srgrimes return (EIO); 59211789Sbde } 5931541Srgrimes } 5941541Srgrimes while (cc > 0) { 5951541Srgrimes if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 5961541Srgrimes (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 5979824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 5981541Srgrimes goto block; 5991541Srgrimes } 6001541Srgrimes (*linesw[tp->t_line].l_rint)(*cp++, tp); 6011541Srgrimes cnt++; 6021541Srgrimes cc--; 6031541Srgrimes } 6041541Srgrimes cc = 0; 6051541Srgrimes } 6061541Srgrimes return (0); 6071541Srgrimesblock: 6081541Srgrimes /* 6091541Srgrimes * Come here to wait for slave to open, for space 61015199Sbde * in outq, or space in rawq, or an empty canq. 6111541Srgrimes */ 61211789Sbde if ((tp->t_state & TS_CONNECTED) == 0) { 61311789Sbde /* adjust for data copied in but not written */ 61411789Sbde uio->uio_resid += cc; 6151541Srgrimes return (EIO); 61611789Sbde } 6171541Srgrimes if (flag & IO_NDELAY) { 6181541Srgrimes /* adjust for data copied in but not written */ 6191541Srgrimes uio->uio_resid += cc; 6201541Srgrimes if (cnt == 0) 6211541Srgrimes return (EWOULDBLOCK); 6221541Srgrimes return (0); 6231541Srgrimes } 6249639Sbde error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 6253308Sphk if (error) { 6261541Srgrimes /* adjust for data copied in but not written */ 6271541Srgrimes uio->uio_resid += cc; 6281541Srgrimes return (error); 6291541Srgrimes } 6301541Srgrimes goto again; 6311541Srgrimes} 6321541Srgrimes 6331541Srgrimes/*ARGSUSED*/ 63412675Sjulianstatic int 6351541Srgrimesptyioctl(dev, cmd, data, flag, p) 6361541Srgrimes dev_t dev; 63736735Sdfr u_long cmd; 6381541Srgrimes caddr_t data; 6391541Srgrimes int flag; 6401541Srgrimes struct proc *p; 6411541Srgrimes{ 64250652Sphk register struct tty *tp = dev->si_tty; 64349536Sphk register struct pt_ioctl *pti = dev->si_drv1; 6441541Srgrimes register u_char *cc = tp->t_cc; 6451541Srgrimes int stop, error; 6461541Srgrimes 64747301Sluoqi if (devsw(dev)->d_open == ptcopen) { 6481541Srgrimes switch (cmd) { 6491541Srgrimes 6501541Srgrimes case TIOCGPGRP: 6511541Srgrimes /* 65233826Sbde * We avoid calling ttioctl on the controller since, 6531541Srgrimes * in that case, tp must be the controlling terminal. 6541541Srgrimes */ 6551541Srgrimes *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 6561541Srgrimes return (0); 6571541Srgrimes 6581541Srgrimes case TIOCPKT: 6591541Srgrimes if (*(int *)data) { 6601541Srgrimes if (pti->pt_flags & PF_UCNTL) 6611541Srgrimes return (EINVAL); 6621541Srgrimes pti->pt_flags |= PF_PKT; 6631541Srgrimes } else 6641541Srgrimes pti->pt_flags &= ~PF_PKT; 6651541Srgrimes return (0); 6661541Srgrimes 6671541Srgrimes case TIOCUCNTL: 6681541Srgrimes if (*(int *)data) { 6691541Srgrimes if (pti->pt_flags & PF_PKT) 6701541Srgrimes return (EINVAL); 6711541Srgrimes pti->pt_flags |= PF_UCNTL; 6721541Srgrimes } else 6731541Srgrimes pti->pt_flags &= ~PF_UCNTL; 6741541Srgrimes return (0); 6751541Srgrimes 6761541Srgrimes case TIOCREMOTE: 6771541Srgrimes if (*(int *)data) 6781541Srgrimes pti->pt_flags |= PF_REMOTE; 6791541Srgrimes else 6801541Srgrimes pti->pt_flags &= ~PF_REMOTE; 6811541Srgrimes ttyflush(tp, FREAD|FWRITE); 6821541Srgrimes return (0); 68347203Sluoqi } 6841541Srgrimes 68547203Sluoqi /* 68647203Sluoqi * The rest of the ioctls shouldn't be called until 68747301Sluoqi * the slave is open. 68847203Sluoqi */ 68947203Sluoqi if ((tp->t_state & TS_ISOPEN) == 0) 69047301Sluoqi return (EAGAIN); 69147203Sluoqi 69247203Sluoqi switch (cmd) { 6931541Srgrimes#ifdef COMPAT_43 6948876Srgrimes case TIOCSETP: 6951541Srgrimes case TIOCSETN: 6961541Srgrimes#endif 6971541Srgrimes case TIOCSETD: 6981541Srgrimes case TIOCSETA: 6991541Srgrimes case TIOCSETAW: 7009858Sache case TIOCSETAF: 70147301Sluoqi /* 70247301Sluoqi * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 70347301Sluoqi * ttywflush(tp) will hang if there are characters in 70447301Sluoqi * the outq. 70547301Sluoqi */ 7061541Srgrimes ndflush(&tp->t_outq, tp->t_outq.c_cc); 7071541Srgrimes break; 7081541Srgrimes 7091541Srgrimes case TIOCSIG: 71027770Sjmg if (*(unsigned int *)data >= NSIG || 71127770Sjmg *(unsigned int *)data == 0) 7121541Srgrimes return(EINVAL); 7131541Srgrimes if ((tp->t_lflag&NOFLSH) == 0) 7141541Srgrimes ttyflush(tp, FREAD|FWRITE); 7151541Srgrimes pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 7161541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7171541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7181541Srgrimes ttyinfo(tp); 7191541Srgrimes return(0); 7201541Srgrimes } 72147203Sluoqi } 72247301Sluoqi if (cmd == TIOCEXT) { 72347301Sluoqi /* 72447301Sluoqi * When the EXTPROC bit is being toggled, we need 72547301Sluoqi * to send an TIOCPKT_IOCTL if the packet driver 72647301Sluoqi * is turned on. 72747301Sluoqi */ 72847301Sluoqi if (*(int *)data) { 72947301Sluoqi if (pti->pt_flags & PF_PKT) { 73047301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 73147301Sluoqi ptcwakeup(tp, FREAD); 73247301Sluoqi } 73347301Sluoqi tp->t_lflag |= EXTPROC; 73447301Sluoqi } else { 73547301Sluoqi if ((tp->t_lflag & EXTPROC) && 73647301Sluoqi (pti->pt_flags & PF_PKT)) { 73747301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 73847301Sluoqi ptcwakeup(tp, FREAD); 73947301Sluoqi } 74047301Sluoqi tp->t_lflag &= ~EXTPROC; 74147301Sluoqi } 74247301Sluoqi return(0); 74347301Sluoqi } 7441541Srgrimes error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 74531577Sbde if (error == ENOIOCTL) 7461541Srgrimes error = ttioctl(tp, cmd, data, flag); 74731577Sbde if (error == ENOIOCTL) { 7481541Srgrimes if (pti->pt_flags & PF_UCNTL && 7491541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7501541Srgrimes if (cmd & 0xff) { 7511541Srgrimes pti->pt_ucntl = (u_char)cmd; 7521541Srgrimes ptcwakeup(tp, FREAD); 7531541Srgrimes } 7541541Srgrimes return (0); 7551541Srgrimes } 7561541Srgrimes error = ENOTTY; 7571541Srgrimes } 7581541Srgrimes /* 7591541Srgrimes * If external processing and packet mode send ioctl packet. 7601541Srgrimes */ 7611541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7621541Srgrimes switch(cmd) { 7631541Srgrimes case TIOCSETA: 7641541Srgrimes case TIOCSETAW: 7651541Srgrimes case TIOCSETAF: 7661541Srgrimes#ifdef COMPAT_43 7671541Srgrimes case TIOCSETP: 7681541Srgrimes case TIOCSETN: 7691541Srgrimes#endif 7701541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7711541Srgrimes case TIOCSETC: 7721541Srgrimes case TIOCSLTC: 7731541Srgrimes case TIOCLBIS: 7741541Srgrimes case TIOCLBIC: 7751541Srgrimes case TIOCLSET: 7761541Srgrimes#endif 7771541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7781541Srgrimes ptcwakeup(tp, FREAD); 7791541Srgrimes default: 7801541Srgrimes break; 7811541Srgrimes } 7821541Srgrimes } 7838876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 7841541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 7851541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 7861541Srgrimes if (stop) { 7871541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 7881541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 7891541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 7901541Srgrimes ptcwakeup(tp, FREAD); 7911541Srgrimes } 7921541Srgrimes } else { 7931541Srgrimes if (!stop) { 7941541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 7951541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 7961541Srgrimes pti->pt_flags |= PF_NOSTOP; 7971541Srgrimes ptcwakeup(tp, FREAD); 7981541Srgrimes } 7991541Srgrimes } 8001541Srgrimes return (error); 8011541Srgrimes} 80212517Sjulian 80312517Sjulian 80429506Sbdestatic void ptc_drvinit __P((void *unused)); 80549536Sphk 80664880Sphkstatic void pty_clone __P((void *arg, char *name, int namelen, dev_t *dev)); 80764880Sphk 80812675Sjulianstatic void 80964880Sphkpty_clone(arg, name, namelen, dev) 81064880Sphk void *arg; 81164880Sphk char *name; 81264880Sphk int namelen; 81364880Sphk dev_t *dev; 81464880Sphk{ 81564880Sphk int u; 81664880Sphk 81764880Sphk if (*dev != NODEV) 81864880Sphk return; 81964880Sphk if (bcmp(name, "pty", 3) != 0) 82064880Sphk return; 82164880Sphk if (name[5] != '\0') 82264880Sphk return; 82364880Sphk switch (name[3]) { 82464880Sphk case 'p': u = 0; break; 82564880Sphk case 'q': u = 32; break; 82664880Sphk case 'r': u = 64; break; 82764880Sphk case 's': u = 96; break; 82864880Sphk case 'P': u = 128; break; 82964880Sphk case 'Q': u = 160; break; 83064880Sphk case 'R': u = 192; break; 83164880Sphk case 'S': u = 224; break; 83264880Sphk default: return; 83364880Sphk } 83464880Sphk if (name[4] >= '0' && name[4] <= '9') 83564880Sphk u += name[4] - '0'; 83664880Sphk else if (name[4] >= 'a' && name[4] <= 'v') 83764880Sphk u += name[4] - 'a' + 10; 83864880Sphk else 83964880Sphk return; 84064880Sphk *dev = ptyinit(u); 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