pty.c revision 83803
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 83803 2001-09-21 22:22:25Z jhb $ 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 n = minor(devc); 14749536Sphk /* For now we only map the lower 8 bits of the minor */ 14849536Sphk if (n & ~0xff) 14964880Sphk return (NODEV); 15049536Sphk 15178405Sbrian devc->si_flags &= ~SI_CHEAPCLONE; 15278405Sbrian 15369781Sdwmalone pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 15450092Sjulian pt->devs = devs = make_dev(&pts_cdevsw, n, 15566067Sphk UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 15677176Sphk pt->devc = devc; 15749536Sphk 15849536Sphk devs->si_drv1 = devc->si_drv1 = pt; 15950652Sphk devs->si_tty = devc->si_tty = &pt->pt_tty; 16077360Sphk pt->pt_tty.t_dev = devs; 16149540Sphk ttyregister(&pt->pt_tty); 16264880Sphk return (devc); 16316322Sgpalmer} 1641541Srgrimes 1651541Srgrimes/*ARGSUSED*/ 16612675Sjulianstatic int 16783366Sjulianptsopen(dev, flag, devtype, td) 1681541Srgrimes dev_t dev; 1691541Srgrimes int flag, devtype; 17083366Sjulian struct thread *td; 1711541Srgrimes{ 17283366Sjulian struct proc *p = td->td_proc; 1731541Srgrimes register struct tty *tp; 1741541Srgrimes int error; 17557070Srwatson struct pt_ioctl *pti; 1761541Srgrimes 17749536Sphk if (!dev->si_drv1) 17849536Sphk return(ENXIO); 17957070Srwatson pti = dev->si_drv1; 18050652Sphk tp = dev->si_tty; 1811541Srgrimes if ((tp->t_state & TS_ISOPEN) == 0) { 1821541Srgrimes ttychars(tp); /* Set up default chars */ 1831541Srgrimes tp->t_iflag = TTYDEF_IFLAG; 1841541Srgrimes tp->t_oflag = TTYDEF_OFLAG; 1851541Srgrimes tp->t_lflag = TTYDEF_LFLAG; 1861541Srgrimes tp->t_cflag = TTYDEF_CFLAG; 1871541Srgrimes tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 18857070Srwatson } else if (tp->t_state & TS_XCLUDE && suser(p)) { 1891541Srgrimes return (EBUSY); 19072786Srwatson } else if (pti->pt_prison != p->p_ucred->cr_prison) { 19157070Srwatson return (EBUSY); 19257070Srwatson } 1931541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 1949824Sbde (void)(*linesw[tp->t_line].l_modem)(tp, 1); 1951541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 1961541Srgrimes if (flag&FNONBLOCK) 1971541Srgrimes break; 1989639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1999624Sbde "ptsopn", 0); 2003308Sphk if (error) 2011541Srgrimes return (error); 2021541Srgrimes } 2031541Srgrimes error = (*linesw[tp->t_line].l_open)(dev, tp); 2047724Sache if (error == 0) 2057724Sache ptcwakeup(tp, FREAD|FWRITE); 2061541Srgrimes return (error); 2071541Srgrimes} 2081541Srgrimes 20912675Sjulianstatic int 21083366Sjulianptsclose(dev, flag, mode, td) 2111541Srgrimes dev_t dev; 2121541Srgrimes int flag, mode; 21383366Sjulian struct thread *td; 2141541Srgrimes{ 2151541Srgrimes register struct tty *tp; 2161541Srgrimes int err; 2171541Srgrimes 21850652Sphk tp = dev->si_tty; 2191541Srgrimes err = (*linesw[tp->t_line].l_close)(tp, flag); 2207730Sache ptsstop(tp, FREAD|FWRITE); 2217724Sache (void) ttyclose(tp); 2221541Srgrimes return (err); 2231541Srgrimes} 2241541Srgrimes 22512675Sjulianstatic int 2261541Srgrimesptsread(dev, uio, flag) 2271541Srgrimes dev_t dev; 2281541Srgrimes struct uio *uio; 2291541Srgrimes int flag; 2301541Srgrimes{ 23183366Sjulian struct thread *td = curthread; 23283366Sjulian struct proc *p = td->td_proc; 23350652Sphk register struct tty *tp = dev->si_tty; 23449536Sphk register struct pt_ioctl *pti = dev->si_drv1; 2351541Srgrimes int error = 0; 2361541Srgrimes 2371541Srgrimesagain: 2381541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2391541Srgrimes while (isbackground(p, tp)) { 24051791Smarcel if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 24151791Smarcel SIGISMEMBER(p->p_sigmask, SIGTTIN) || 24251791Smarcel p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 2431541Srgrimes return (EIO); 2441541Srgrimes pgsignal(p->p_pgrp, SIGTTIN, 1); 2459624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2469624Sbde 0); 2473308Sphk if (error) 2481541Srgrimes return (error); 2491541Srgrimes } 2501541Srgrimes if (tp->t_canq.c_cc == 0) { 2511541Srgrimes if (flag & IO_NDELAY) 2521541Srgrimes return (EWOULDBLOCK); 2539639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2549624Sbde "ptsin", 0); 2553308Sphk if (error) 2561541Srgrimes return (error); 2571541Srgrimes goto again; 2581541Srgrimes } 2591541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2601541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2611541Srgrimes error = EFAULT; 2621541Srgrimes break; 2631541Srgrimes } 2641541Srgrimes if (tp->t_canq.c_cc == 1) 2651541Srgrimes (void) getc(&tp->t_canq); 2661541Srgrimes if (tp->t_canq.c_cc) 2671541Srgrimes return (error); 2681541Srgrimes } else 2691541Srgrimes if (tp->t_oproc) 2701541Srgrimes error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 2711541Srgrimes ptcwakeup(tp, FWRITE); 2721541Srgrimes return (error); 2731541Srgrimes} 2741541Srgrimes 2751541Srgrimes/* 2761541Srgrimes * Write to pseudo-tty. 2771541Srgrimes * Wakeups of controlling tty will happen 2781541Srgrimes * indirectly, when tty driver calls ptsstart. 2791541Srgrimes */ 28012675Sjulianstatic int 2811541Srgrimesptswrite(dev, uio, flag) 2821541Srgrimes dev_t dev; 2831541Srgrimes struct uio *uio; 2841541Srgrimes int flag; 2851541Srgrimes{ 2861541Srgrimes register struct tty *tp; 2871541Srgrimes 28850652Sphk tp = dev->si_tty; 2891541Srgrimes if (tp->t_oproc == 0) 2901541Srgrimes return (EIO); 2911541Srgrimes return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2921541Srgrimes} 2931541Srgrimes 2941541Srgrimes/* 2951541Srgrimes * Start output on pseudo-tty. 2961541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 2971541Srgrimes */ 29812819Sphkstatic void 2991541Srgrimesptsstart(tp) 3001541Srgrimes struct tty *tp; 3011541Srgrimes{ 30249536Sphk register struct pt_ioctl *pti = tp->t_dev->si_drv1; 3031541Srgrimes 3041541Srgrimes if (tp->t_state & TS_TTSTOP) 3051541Srgrimes return; 3061541Srgrimes if (pti->pt_flags & PF_STOPPED) { 3071541Srgrimes pti->pt_flags &= ~PF_STOPPED; 3081541Srgrimes pti->pt_send = TIOCPKT_START; 3091541Srgrimes } 3101541Srgrimes ptcwakeup(tp, FREAD); 3111541Srgrimes} 3121541Srgrimes 31312819Sphkstatic void 3141541Srgrimesptcwakeup(tp, flag) 3151541Srgrimes struct tty *tp; 3161541Srgrimes int flag; 3171541Srgrimes{ 31849536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 3191541Srgrimes 3201541Srgrimes if (flag & FREAD) { 3211541Srgrimes selwakeup(&pti->pt_selr); 3229639Sbde wakeup(TSA_PTC_READ(tp)); 3231541Srgrimes } 3241541Srgrimes if (flag & FWRITE) { 3251541Srgrimes selwakeup(&pti->pt_selw); 3269639Sbde wakeup(TSA_PTC_WRITE(tp)); 3271541Srgrimes } 3281541Srgrimes} 3291541Srgrimes 33012675Sjulianstatic int 33183366Sjulianptcopen(dev, flag, devtype, td) 3321541Srgrimes dev_t dev; 3331541Srgrimes int flag, devtype; 33483366Sjulian struct thread *td; 3351541Srgrimes{ 33683366Sjulian struct proc *p = td->td_proc; 3371541Srgrimes register struct tty *tp; 3381541Srgrimes struct pt_ioctl *pti; 3391541Srgrimes 34049536Sphk if (!dev->si_drv1) 34177176Sphk ptyinit(dev); 34249536Sphk if (!dev->si_drv1) 34349536Sphk return(ENXIO); 34450652Sphk tp = dev->si_tty; 3451541Srgrimes if (tp->t_oproc) 3461541Srgrimes return (EIO); 34759818Sache tp->t_timeout = -1; 3481541Srgrimes tp->t_oproc = ptsstart; 34951654Sphk tp->t_stop = ptsstop; 3501541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 1); 3511541Srgrimes tp->t_lflag &= ~EXTPROC; 35249536Sphk pti = dev->si_drv1; 35372786Srwatson pti->pt_prison = p->p_ucred->cr_prison; 3541541Srgrimes pti->pt_flags = 0; 3551541Srgrimes pti->pt_send = 0; 3561541Srgrimes pti->pt_ucntl = 0; 3571541Srgrimes return (0); 3581541Srgrimes} 3591541Srgrimes 36012675Sjulianstatic int 36183366Sjulianptcclose(dev, flags, fmt, td) 3621541Srgrimes dev_t dev; 36310624Sbde int flags; 36410624Sbde int fmt; 36583366Sjulian struct thread *td; 3661541Srgrimes{ 3671541Srgrimes register struct tty *tp; 3681541Srgrimes 36950652Sphk tp = dev->si_tty; 3701541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 0); 3719824Sbde 3729824Sbde /* 3739824Sbde * XXX MDMBUF makes no sense for ptys but would inhibit the above 3749824Sbde * l_modem(). CLOCAL makes sense but isn't supported. Special 3759824Sbde * l_modem()s that ignore carrier drop make no sense for ptys but 3769824Sbde * may be in use because other parts of the line discipline make 3779824Sbde * sense for ptys. Recover by doing everything that a normal 3789824Sbde * ttymodem() would have done except for sending a SIGHUP. 3799824Sbde */ 3809850Sbde if (tp->t_state & TS_ISOPEN) { 3819850Sbde tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 3829850Sbde tp->t_state |= TS_ZOMBIE; 3839850Sbde ttyflush(tp, FREAD | FWRITE); 3849850Sbde } 3859824Sbde 3861541Srgrimes tp->t_oproc = 0; /* mark closed */ 3871541Srgrimes return (0); 3881541Srgrimes} 3891541Srgrimes 39012675Sjulianstatic int 3911541Srgrimesptcread(dev, uio, flag) 3921541Srgrimes dev_t dev; 3931541Srgrimes struct uio *uio; 3941541Srgrimes int flag; 3951541Srgrimes{ 39650652Sphk register struct tty *tp = dev->si_tty; 39749536Sphk struct pt_ioctl *pti = dev->si_drv1; 3981541Srgrimes char buf[BUFSIZ]; 3991541Srgrimes int error = 0, cc; 4001541Srgrimes 4011541Srgrimes /* 4021541Srgrimes * We want to block until the slave 4031541Srgrimes * is open, and there's something to read; 4041541Srgrimes * but if we lost the slave or we're NBIO, 4051541Srgrimes * then return the appropriate error instead. 4061541Srgrimes */ 4071541Srgrimes for (;;) { 4081541Srgrimes if (tp->t_state&TS_ISOPEN) { 4091541Srgrimes if (pti->pt_flags&PF_PKT && pti->pt_send) { 4101541Srgrimes error = ureadc((int)pti->pt_send, uio); 4111541Srgrimes if (error) 4121541Srgrimes return (error); 4131541Srgrimes if (pti->pt_send & TIOCPKT_IOCTL) { 4141541Srgrimes cc = min(uio->uio_resid, 4151541Srgrimes sizeof(tp->t_termios)); 4162807Sbde uiomove((caddr_t)&tp->t_termios, cc, 4172807Sbde uio); 4181541Srgrimes } 4191541Srgrimes pti->pt_send = 0; 4201541Srgrimes return (0); 4211541Srgrimes } 4221541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 4231541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 4241541Srgrimes if (error) 4251541Srgrimes return (error); 4261541Srgrimes pti->pt_ucntl = 0; 4271541Srgrimes return (0); 4281541Srgrimes } 4291541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4301541Srgrimes break; 4311541Srgrimes } 4329824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4331541Srgrimes return (0); /* EOF */ 4341541Srgrimes if (flag & IO_NDELAY) 4351541Srgrimes return (EWOULDBLOCK); 4369639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4373308Sphk if (error) 4381541Srgrimes return (error); 4391541Srgrimes } 4401541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4411541Srgrimes error = ureadc(0, uio); 4421541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4431541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4441541Srgrimes if (cc <= 0) 4451541Srgrimes break; 4461541Srgrimes error = uiomove(buf, cc, uio); 4471541Srgrimes } 4489626Sbde ttwwakeup(tp); 4491541Srgrimes return (error); 4501541Srgrimes} 4511541Srgrimes 45212675Sjulianstatic void 4531541Srgrimesptsstop(tp, flush) 4541541Srgrimes register struct tty *tp; 4551541Srgrimes int flush; 4561541Srgrimes{ 45749536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 4581541Srgrimes int flag; 4591541Srgrimes 4601541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4611541Srgrimes if (flush == 0) { 4621541Srgrimes flush = TIOCPKT_STOP; 4631541Srgrimes pti->pt_flags |= PF_STOPPED; 4641541Srgrimes } else 4651541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4661541Srgrimes pti->pt_send |= flush; 4671541Srgrimes /* change of perspective */ 4681541Srgrimes flag = 0; 4691541Srgrimes if (flush & FREAD) 4701541Srgrimes flag |= FWRITE; 4711541Srgrimes if (flush & FWRITE) 4721541Srgrimes flag |= FREAD; 4731541Srgrimes ptcwakeup(tp, flag); 4741541Srgrimes} 4751541Srgrimes 47612675Sjulianstatic int 47783366Sjulianptcpoll(dev, events, td) 4781541Srgrimes dev_t dev; 47929354Speter int events; 48083366Sjulian struct thread *td; 4811541Srgrimes{ 48250652Sphk register struct tty *tp = dev->si_tty; 48349536Sphk struct pt_ioctl *pti = dev->si_drv1; 48429354Speter int revents = 0; 4851541Srgrimes int s; 4861541Srgrimes 4879824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 48883366Sjulian return (seltrue(dev, events, td) | POLLHUP); 4891541Srgrimes 49029354Speter /* 49129354Speter * Need to block timeouts (ttrstart). 49229354Speter */ 49329354Speter s = spltty(); 4941541Srgrimes 49529354Speter if (events & (POLLIN | POLLRDNORM)) 49629354Speter if ((tp->t_state & TS_ISOPEN) && 49729354Speter ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 49829354Speter ((pti->pt_flags & PF_PKT) && pti->pt_send) || 49929354Speter ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 50029354Speter revents |= events & (POLLIN | POLLRDNORM); 5011541Srgrimes 50229354Speter if (events & (POLLOUT | POLLWRNORM)) 50329354Speter if (tp->t_state & TS_ISOPEN && 50429354Speter ((pti->pt_flags & PF_REMOTE) ? 50529354Speter (tp->t_canq.c_cc == 0) : 50629354Speter ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 50729354Speter (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 50829354Speter revents |= events & (POLLOUT | POLLWRNORM); 5091541Srgrimes 51029354Speter if (events & POLLHUP) 51129354Speter if ((tp->t_state & TS_CARR_ON) == 0) 51229354Speter revents |= POLLHUP; 5131541Srgrimes 51429354Speter if (revents == 0) { 51529354Speter if (events & (POLLIN | POLLRDNORM)) 51683803Sjhb selrecord(td, &pti->pt_selr); 51729354Speter 51829354Speter if (events & (POLLOUT | POLLWRNORM)) 51983803Sjhb selrecord(td, &pti->pt_selw); 5201541Srgrimes } 52129354Speter splx(s); 52229354Speter 52329354Speter return (revents); 5241541Srgrimes} 5251541Srgrimes 52612675Sjulianstatic int 5271541Srgrimesptcwrite(dev, uio, flag) 5281541Srgrimes dev_t dev; 5291541Srgrimes register struct uio *uio; 5301541Srgrimes int flag; 5311541Srgrimes{ 53250652Sphk register struct tty *tp = dev->si_tty; 5331549Srgrimes register u_char *cp = 0; 5341541Srgrimes register int cc = 0; 5351541Srgrimes u_char locbuf[BUFSIZ]; 5361541Srgrimes int cnt = 0; 53749536Sphk struct pt_ioctl *pti = dev->si_drv1; 5381541Srgrimes int error = 0; 5391541Srgrimes 5401541Srgrimesagain: 5411541Srgrimes if ((tp->t_state&TS_ISOPEN) == 0) 5421541Srgrimes goto block; 5431541Srgrimes if (pti->pt_flags & PF_REMOTE) { 5441541Srgrimes if (tp->t_canq.c_cc) 5451541Srgrimes goto block; 54611789Sbde while ((uio->uio_resid > 0 || cc > 0) && 54711789Sbde tp->t_canq.c_cc < TTYHOG - 1) { 5481541Srgrimes if (cc == 0) { 5491541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5501541Srgrimes cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 5511541Srgrimes cp = locbuf; 5521541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5531541Srgrimes if (error) 5541541Srgrimes return (error); 5551541Srgrimes /* check again for safety */ 55611789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 55711789Sbde /* adjust as usual */ 55811789Sbde uio->uio_resid += cc; 5591541Srgrimes return (EIO); 56011789Sbde } 5611541Srgrimes } 56215199Sbde if (cc > 0) { 56315199Sbde cc = b_to_q((char *)cp, cc, &tp->t_canq); 56415199Sbde /* 56515199Sbde * XXX we don't guarantee that the canq size 56615199Sbde * is >= TTYHOG, so the above b_to_q() may 56715199Sbde * leave some bytes uncopied. However, space 56815199Sbde * is guaranteed for the null terminator if 56915199Sbde * we don't fail here since (TTYHOG - 1) is 57015199Sbde * not a multiple of CBSIZE. 57115199Sbde */ 57215199Sbde if (cc > 0) 57315199Sbde break; 57415199Sbde } 5751541Srgrimes } 57611789Sbde /* adjust for data copied in but not written */ 57711789Sbde uio->uio_resid += cc; 5781541Srgrimes (void) putc(0, &tp->t_canq); 5791541Srgrimes ttwakeup(tp); 5809639Sbde wakeup(TSA_PTS_READ(tp)); 5811541Srgrimes return (0); 5821541Srgrimes } 58311789Sbde while (uio->uio_resid > 0 || cc > 0) { 5841541Srgrimes if (cc == 0) { 5851541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5861541Srgrimes cp = locbuf; 5871541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5881541Srgrimes if (error) 5891541Srgrimes return (error); 5901541Srgrimes /* check again for safety */ 59111789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 59211789Sbde /* adjust for data copied in but not written */ 59311789Sbde uio->uio_resid += cc; 5941541Srgrimes return (EIO); 59511789Sbde } 5961541Srgrimes } 5971541Srgrimes while (cc > 0) { 5981541Srgrimes if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 5991541Srgrimes (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 6009824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 6011541Srgrimes goto block; 6021541Srgrimes } 6031541Srgrimes (*linesw[tp->t_line].l_rint)(*cp++, tp); 6041541Srgrimes cnt++; 6051541Srgrimes cc--; 6061541Srgrimes } 6071541Srgrimes cc = 0; 6081541Srgrimes } 6091541Srgrimes return (0); 6101541Srgrimesblock: 6111541Srgrimes /* 6121541Srgrimes * Come here to wait for slave to open, for space 61315199Sbde * in outq, or space in rawq, or an empty canq. 6141541Srgrimes */ 61511789Sbde if ((tp->t_state & TS_CONNECTED) == 0) { 61611789Sbde /* adjust for data copied in but not written */ 61711789Sbde uio->uio_resid += cc; 6181541Srgrimes return (EIO); 61911789Sbde } 6201541Srgrimes if (flag & IO_NDELAY) { 6211541Srgrimes /* adjust for data copied in but not written */ 6221541Srgrimes uio->uio_resid += cc; 6231541Srgrimes if (cnt == 0) 6241541Srgrimes return (EWOULDBLOCK); 6251541Srgrimes return (0); 6261541Srgrimes } 6279639Sbde error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 6283308Sphk if (error) { 6291541Srgrimes /* adjust for data copied in but not written */ 6301541Srgrimes uio->uio_resid += cc; 6311541Srgrimes return (error); 6321541Srgrimes } 6331541Srgrimes goto again; 6341541Srgrimes} 6351541Srgrimes 6361541Srgrimes/*ARGSUSED*/ 63712675Sjulianstatic int 63883366Sjulianptyioctl(dev, cmd, data, flag, td) 6391541Srgrimes dev_t dev; 64036735Sdfr u_long cmd; 6411541Srgrimes caddr_t data; 6421541Srgrimes int flag; 64383366Sjulian struct thread *td; 6441541Srgrimes{ 64550652Sphk register struct tty *tp = dev->si_tty; 64649536Sphk register struct pt_ioctl *pti = dev->si_drv1; 6471541Srgrimes register u_char *cc = tp->t_cc; 6481541Srgrimes int stop, error; 6491541Srgrimes 65047301Sluoqi if (devsw(dev)->d_open == ptcopen) { 6511541Srgrimes switch (cmd) { 6521541Srgrimes 6531541Srgrimes case TIOCGPGRP: 6541541Srgrimes /* 65533826Sbde * We avoid calling ttioctl on the controller since, 6561541Srgrimes * in that case, tp must be the controlling terminal. 6571541Srgrimes */ 6581541Srgrimes *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 6591541Srgrimes return (0); 6601541Srgrimes 6611541Srgrimes case TIOCPKT: 6621541Srgrimes if (*(int *)data) { 6631541Srgrimes if (pti->pt_flags & PF_UCNTL) 6641541Srgrimes return (EINVAL); 6651541Srgrimes pti->pt_flags |= PF_PKT; 6661541Srgrimes } else 6671541Srgrimes pti->pt_flags &= ~PF_PKT; 6681541Srgrimes return (0); 6691541Srgrimes 6701541Srgrimes case TIOCUCNTL: 6711541Srgrimes if (*(int *)data) { 6721541Srgrimes if (pti->pt_flags & PF_PKT) 6731541Srgrimes return (EINVAL); 6741541Srgrimes pti->pt_flags |= PF_UCNTL; 6751541Srgrimes } else 6761541Srgrimes pti->pt_flags &= ~PF_UCNTL; 6771541Srgrimes return (0); 6781541Srgrimes 6791541Srgrimes case TIOCREMOTE: 6801541Srgrimes if (*(int *)data) 6811541Srgrimes pti->pt_flags |= PF_REMOTE; 6821541Srgrimes else 6831541Srgrimes pti->pt_flags &= ~PF_REMOTE; 6841541Srgrimes ttyflush(tp, FREAD|FWRITE); 6851541Srgrimes return (0); 68647203Sluoqi } 6871541Srgrimes 68847203Sluoqi /* 68947203Sluoqi * The rest of the ioctls shouldn't be called until 69047301Sluoqi * the slave is open. 69147203Sluoqi */ 69247203Sluoqi if ((tp->t_state & TS_ISOPEN) == 0) 69347301Sluoqi return (EAGAIN); 69447203Sluoqi 69547203Sluoqi switch (cmd) { 6961541Srgrimes#ifdef COMPAT_43 6978876Srgrimes case TIOCSETP: 6981541Srgrimes case TIOCSETN: 6991541Srgrimes#endif 7001541Srgrimes case TIOCSETD: 7011541Srgrimes case TIOCSETA: 7021541Srgrimes case TIOCSETAW: 7039858Sache case TIOCSETAF: 70447301Sluoqi /* 70547301Sluoqi * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 70647301Sluoqi * ttywflush(tp) will hang if there are characters in 70747301Sluoqi * the outq. 70847301Sluoqi */ 7091541Srgrimes ndflush(&tp->t_outq, tp->t_outq.c_cc); 7101541Srgrimes break; 7111541Srgrimes 7121541Srgrimes case TIOCSIG: 71327770Sjmg if (*(unsigned int *)data >= NSIG || 71427770Sjmg *(unsigned int *)data == 0) 7151541Srgrimes return(EINVAL); 7161541Srgrimes if ((tp->t_lflag&NOFLSH) == 0) 7171541Srgrimes ttyflush(tp, FREAD|FWRITE); 7181541Srgrimes pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 7191541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7201541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7211541Srgrimes ttyinfo(tp); 7221541Srgrimes return(0); 7231541Srgrimes } 72447203Sluoqi } 72547301Sluoqi if (cmd == TIOCEXT) { 72647301Sluoqi /* 72747301Sluoqi * When the EXTPROC bit is being toggled, we need 72847301Sluoqi * to send an TIOCPKT_IOCTL if the packet driver 72947301Sluoqi * is turned on. 73047301Sluoqi */ 73147301Sluoqi if (*(int *)data) { 73247301Sluoqi if (pti->pt_flags & PF_PKT) { 73347301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 73447301Sluoqi ptcwakeup(tp, FREAD); 73547301Sluoqi } 73647301Sluoqi tp->t_lflag |= EXTPROC; 73747301Sluoqi } else { 73847301Sluoqi if ((tp->t_lflag & EXTPROC) && 73947301Sluoqi (pti->pt_flags & PF_PKT)) { 74047301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 74147301Sluoqi ptcwakeup(tp, FREAD); 74247301Sluoqi } 74347301Sluoqi tp->t_lflag &= ~EXTPROC; 74447301Sluoqi } 74547301Sluoqi return(0); 74647301Sluoqi } 74783366Sjulian error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td); 74831577Sbde if (error == ENOIOCTL) 7491541Srgrimes error = ttioctl(tp, cmd, data, flag); 75031577Sbde if (error == ENOIOCTL) { 7511541Srgrimes if (pti->pt_flags & PF_UCNTL && 7521541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7531541Srgrimes if (cmd & 0xff) { 7541541Srgrimes pti->pt_ucntl = (u_char)cmd; 7551541Srgrimes ptcwakeup(tp, FREAD); 7561541Srgrimes } 7571541Srgrimes return (0); 7581541Srgrimes } 7591541Srgrimes error = ENOTTY; 7601541Srgrimes } 7611541Srgrimes /* 7621541Srgrimes * If external processing and packet mode send ioctl packet. 7631541Srgrimes */ 7641541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7651541Srgrimes switch(cmd) { 7661541Srgrimes case TIOCSETA: 7671541Srgrimes case TIOCSETAW: 7681541Srgrimes case TIOCSETAF: 7691541Srgrimes#ifdef COMPAT_43 7701541Srgrimes case TIOCSETP: 7711541Srgrimes case TIOCSETN: 7721541Srgrimes#endif 7731541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7741541Srgrimes case TIOCSETC: 7751541Srgrimes case TIOCSLTC: 7761541Srgrimes case TIOCLBIS: 7771541Srgrimes case TIOCLBIC: 7781541Srgrimes case TIOCLSET: 7791541Srgrimes#endif 7801541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7811541Srgrimes ptcwakeup(tp, FREAD); 7821541Srgrimes default: 7831541Srgrimes break; 7841541Srgrimes } 7851541Srgrimes } 7868876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 7871541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 7881541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 7891541Srgrimes if (stop) { 7901541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 7911541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 7921541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 7931541Srgrimes ptcwakeup(tp, FREAD); 7941541Srgrimes } 7951541Srgrimes } else { 7961541Srgrimes if (!stop) { 7971541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 7981541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 7991541Srgrimes pti->pt_flags |= PF_NOSTOP; 8001541Srgrimes ptcwakeup(tp, FREAD); 8011541Srgrimes } 8021541Srgrimes } 8031541Srgrimes return (error); 8041541Srgrimes} 80512517Sjulian 80612517Sjulian 80729506Sbdestatic void ptc_drvinit __P((void *unused)); 80849536Sphk 80964880Sphkstatic void pty_clone __P((void *arg, char *name, int namelen, dev_t *dev)); 81064880Sphk 81112675Sjulianstatic void 81264880Sphkpty_clone(arg, name, namelen, dev) 81364880Sphk void *arg; 81464880Sphk char *name; 81564880Sphk int namelen; 81664880Sphk dev_t *dev; 81764880Sphk{ 81864880Sphk int u; 81964880Sphk 82064880Sphk if (*dev != NODEV) 82164880Sphk return; 82264880Sphk if (bcmp(name, "pty", 3) != 0) 82364880Sphk return; 82464880Sphk if (name[5] != '\0') 82564880Sphk return; 82664880Sphk switch (name[3]) { 82764880Sphk case 'p': u = 0; break; 82864880Sphk case 'q': u = 32; break; 82964880Sphk case 'r': u = 64; break; 83064880Sphk case 's': u = 96; break; 83164880Sphk case 'P': u = 128; break; 83264880Sphk case 'Q': u = 160; break; 83364880Sphk case 'R': u = 192; break; 83464880Sphk case 'S': u = 224; break; 83564880Sphk default: return; 83664880Sphk } 83764880Sphk if (name[4] >= '0' && name[4] <= '9') 83864880Sphk u += name[4] - '0'; 83964880Sphk else if (name[4] >= 'a' && name[4] <= 'v') 84064880Sphk u += name[4] - 'a' + 10; 84164880Sphk else 84264880Sphk return; 84377176Sphk *dev = make_dev(&ptc_cdevsw, u, 84477176Sphk UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 84577176Sphk (*dev)->si_flags |= SI_CHEAPCLONE; 84664880Sphk return; 84764880Sphk} 84864880Sphk 84964880Sphkstatic void 85029506Sbdeptc_drvinit(unused) 85129506Sbde void *unused; 85212517Sjulian{ 85365374Sphk EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 85453483Sjkh cdevsw_add(&pts_cdevsw); 85553483Sjkh cdevsw_add(&ptc_cdevsw); 85612517Sjulian} 85712517Sjulian 85812517SjulianSYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 859