pty.c revision 57070
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 57070 2000-02-09 03:32:11Z rwatson $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes/* 381541Srgrimes * Pseudo-teletype Driver 391541Srgrimes * (Actually two drivers, requiring two entries in 'cdevsw') 401541Srgrimes */ 411541Srgrimes#include "pty.h" /* XXX */ 4231778Seivind#include "opt_compat.h" 431541Srgrimes#include <sys/param.h> 441541Srgrimes#include <sys/systm.h> 4524207Sbde#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 4624207Sbde#include <sys/ioctl_compat.h> 4724207Sbde#endif 481541Srgrimes#include <sys/proc.h> 491541Srgrimes#include <sys/tty.h> 501541Srgrimes#include <sys/conf.h> 5124131Sbde#include <sys/fcntl.h> 5229354Speter#include <sys/poll.h> 531541Srgrimes#include <sys/kernel.h> 541541Srgrimes#include <sys/vnode.h> 553308Sphk#include <sys/signalvar.h> 5649536Sphk#include <sys/malloc.h> 571541Srgrimes 5849536SphkMALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 5912517Sjulian 6012819Sphkstatic void ptsstart __P((struct tty *tp)); 6151654Sphkstatic void ptsstop __P((struct tty *tp, int rw)); 6212819Sphkstatic void ptcwakeup __P((struct tty *tp, int flag)); 6349536Sphkstatic void ptyinit __P((int n)); 6411789Sbde 6512675Sjulianstatic d_open_t ptsopen; 6612675Sjulianstatic d_close_t ptsclose; 6712675Sjulianstatic d_read_t ptsread; 6812675Sjulianstatic d_write_t ptswrite; 6912675Sjulianstatic d_ioctl_t ptyioctl; 7012675Sjulianstatic d_open_t ptcopen; 7112675Sjulianstatic d_close_t ptcclose; 7212675Sjulianstatic d_read_t ptcread; 7312675Sjulianstatic d_write_t ptcwrite; 7429354Speterstatic d_poll_t ptcpoll; 7512675Sjulian 7638485Sbde#define CDEV_MAJOR_S 5 7747625Sphkstatic struct cdevsw pts_cdevsw = { 7847625Sphk /* open */ ptsopen, 7947625Sphk /* close */ ptsclose, 8047625Sphk /* read */ ptsread, 8147625Sphk /* write */ ptswrite, 8247625Sphk /* ioctl */ ptyioctl, 8351654Sphk /* poll */ ttypoll, 8447625Sphk /* mmap */ nommap, 8547625Sphk /* strategy */ nostrategy, 8647625Sphk /* name */ "pts", 8747625Sphk /* maj */ CDEV_MAJOR_S, 8847625Sphk /* dump */ nodump, 8947625Sphk /* psize */ nopsize, 9047625Sphk /* flags */ D_TTY, 9147625Sphk /* bmaj */ -1 9238485Sbde}; 9312675Sjulian 9438485Sbde#define CDEV_MAJOR_C 6 9547625Sphkstatic struct cdevsw ptc_cdevsw = { 9647625Sphk /* open */ ptcopen, 9747625Sphk /* close */ ptcclose, 9847625Sphk /* read */ ptcread, 9947625Sphk /* write */ ptcwrite, 10047625Sphk /* ioctl */ ptyioctl, 10147625Sphk /* poll */ ptcpoll, 10247625Sphk /* mmap */ nommap, 10347625Sphk /* strategy */ nostrategy, 10447625Sphk /* name */ "ptc", 10547625Sphk /* maj */ CDEV_MAJOR_C, 10647625Sphk /* dump */ nodump, 10747625Sphk /* psize */ nopsize, 10847625Sphk /* flags */ D_TTY, 10947625Sphk /* bmaj */ -1 11038485Sbde}; 11112675Sjulian 1121541Srgrimes#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 1131541Srgrimes 11449536Sphkstruct pt_ioctl { 1151541Srgrimes int pt_flags; 1161541Srgrimes struct selinfo pt_selr, pt_selw; 1171541Srgrimes u_char pt_send; 1181541Srgrimes u_char pt_ucntl; 11949536Sphk struct tty pt_tty; 12050092Sjulian dev_t devs, devc; 12157070Srwatson struct prison *pt_prison; 12249536Sphk}; 1231541Srgrimes 1241541Srgrimes#define PF_PKT 0x08 /* packet mode */ 1251541Srgrimes#define PF_STOPPED 0x10 /* user told stopped */ 1261541Srgrimes#define PF_REMOTE 0x20 /* remote and flow controlled input */ 1271541Srgrimes#define PF_NOSTOP 0x40 1281541Srgrimes#define PF_UCNTL 0x80 /* user control mode */ 1291541Srgrimes 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 */ 13912819Sphkstatic void 14049536Sphkptyinit(n) 1411541Srgrimes int n; 1421541Srgrimes{ 14349536Sphk dev_t devs, devc; 14449536Sphk char *names = "pqrsPQRS"; 14549536Sphk struct pt_ioctl *pt; 1461541Srgrimes 14749536Sphk /* For now we only map the lower 8 bits of the minor */ 14849536Sphk if (n & ~0xff) 14949536Sphk return; 15049536Sphk 15150092Sjulian pt = malloc(sizeof(*pt), M_PTY, M_WAITOK); 15250092Sjulian bzero(pt, sizeof(*pt)); 15350092Sjulian pt->devs = devs = make_dev(&pts_cdevsw, n, 15449536Sphk 0, 0, 0666, "tty%c%r", names[n / 32], n % 32); 15550092Sjulian pt->devc = devc = make_dev(&ptc_cdevsw, n, 15649536Sphk 0, 0, 0666, "pty%c%r", names[n / 32], n % 32); 15749536Sphk 15849536Sphk devs->si_drv1 = devc->si_drv1 = pt; 15950652Sphk devs->si_tty = devc->si_tty = &pt->pt_tty; 16049540Sphk ttyregister(&pt->pt_tty); 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; 17249992Sjulian int minr; 17349992Sjulian dev_t nextdev; 17457070Srwatson struct pt_ioctl *pti; 1751541Srgrimes 17649992Sjulian /* 17750254Sphk * XXX: Gross hack for DEVFS: 17849992Sjulian * If we openned this device, ensure we have the 17950254Sphk * next one too, so people can open it. 18049992Sjulian */ 18149992Sjulian minr = lminor(dev); 18249992Sjulian if (minr < 255) { 18349992Sjulian nextdev = makedev(major(dev), minr + 1); 18449992Sjulian if (!nextdev->si_drv1) { 18549992Sjulian ptyinit(minr + 1); 18649992Sjulian } 18749992Sjulian } 18849536Sphk if (!dev->si_drv1) 18949536Sphk ptyinit(minor(dev)); 19049536Sphk if (!dev->si_drv1) 19149536Sphk return(ENXIO); 19257070Srwatson pti = dev->si_drv1; 19350652Sphk tp = dev->si_tty; 1941541Srgrimes if ((tp->t_state & TS_ISOPEN) == 0) { 1951541Srgrimes ttychars(tp); /* Set up default chars */ 1961541Srgrimes tp->t_iflag = TTYDEF_IFLAG; 1971541Srgrimes tp->t_oflag = TTYDEF_OFLAG; 1981541Srgrimes tp->t_lflag = TTYDEF_LFLAG; 1991541Srgrimes tp->t_cflag = TTYDEF_CFLAG; 2001541Srgrimes tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 20157070Srwatson } else if (tp->t_state & TS_XCLUDE && suser(p)) { 2021541Srgrimes return (EBUSY); 20357070Srwatson } else if (pti->pt_prison != p->p_prison) { 20457070Srwatson return (EBUSY); 20557070Srwatson } 2061541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 2079824Sbde (void)(*linesw[tp->t_line].l_modem)(tp, 1); 2081541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 2091541Srgrimes if (flag&FNONBLOCK) 2101541Srgrimes break; 2119639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 2129624Sbde "ptsopn", 0); 2133308Sphk if (error) 2141541Srgrimes return (error); 2151541Srgrimes } 2161541Srgrimes error = (*linesw[tp->t_line].l_open)(dev, tp); 2177724Sache if (error == 0) 2187724Sache ptcwakeup(tp, FREAD|FWRITE); 2191541Srgrimes return (error); 2201541Srgrimes} 2211541Srgrimes 22212675Sjulianstatic int 2231541Srgrimesptsclose(dev, flag, mode, p) 2241541Srgrimes dev_t dev; 2251541Srgrimes int flag, mode; 2261541Srgrimes struct proc *p; 2271541Srgrimes{ 2281541Srgrimes register struct tty *tp; 2291541Srgrimes int err; 2301541Srgrimes 23150652Sphk tp = dev->si_tty; 2321541Srgrimes err = (*linesw[tp->t_line].l_close)(tp, flag); 2337730Sache ptsstop(tp, FREAD|FWRITE); 2347724Sache (void) ttyclose(tp); 2351541Srgrimes return (err); 2361541Srgrimes} 2371541Srgrimes 23812675Sjulianstatic int 2391541Srgrimesptsread(dev, uio, flag) 2401541Srgrimes dev_t dev; 2411541Srgrimes struct uio *uio; 2421541Srgrimes int flag; 2431541Srgrimes{ 2441541Srgrimes struct proc *p = curproc; 24550652Sphk register struct tty *tp = dev->si_tty; 24649536Sphk register struct pt_ioctl *pti = dev->si_drv1; 2471541Srgrimes int error = 0; 2481541Srgrimes 2491541Srgrimesagain: 2501541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2511541Srgrimes while (isbackground(p, tp)) { 25251791Smarcel if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 25351791Smarcel SIGISMEMBER(p->p_sigmask, SIGTTIN) || 25451791Smarcel p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) 2551541Srgrimes return (EIO); 2561541Srgrimes pgsignal(p->p_pgrp, SIGTTIN, 1); 2579624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2589624Sbde 0); 2593308Sphk if (error) 2601541Srgrimes return (error); 2611541Srgrimes } 2621541Srgrimes if (tp->t_canq.c_cc == 0) { 2631541Srgrimes if (flag & IO_NDELAY) 2641541Srgrimes return (EWOULDBLOCK); 2659639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2669624Sbde "ptsin", 0); 2673308Sphk if (error) 2681541Srgrimes return (error); 2691541Srgrimes goto again; 2701541Srgrimes } 2711541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2721541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2731541Srgrimes error = EFAULT; 2741541Srgrimes break; 2751541Srgrimes } 2761541Srgrimes if (tp->t_canq.c_cc == 1) 2771541Srgrimes (void) getc(&tp->t_canq); 2781541Srgrimes if (tp->t_canq.c_cc) 2791541Srgrimes return (error); 2801541Srgrimes } else 2811541Srgrimes if (tp->t_oproc) 2821541Srgrimes error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 2831541Srgrimes ptcwakeup(tp, FWRITE); 2841541Srgrimes return (error); 2851541Srgrimes} 2861541Srgrimes 2871541Srgrimes/* 2881541Srgrimes * Write to pseudo-tty. 2891541Srgrimes * Wakeups of controlling tty will happen 2901541Srgrimes * indirectly, when tty driver calls ptsstart. 2911541Srgrimes */ 29212675Sjulianstatic int 2931541Srgrimesptswrite(dev, uio, flag) 2941541Srgrimes dev_t dev; 2951541Srgrimes struct uio *uio; 2961541Srgrimes int flag; 2971541Srgrimes{ 2981541Srgrimes register struct tty *tp; 2991541Srgrimes 30050652Sphk tp = dev->si_tty; 3011541Srgrimes if (tp->t_oproc == 0) 3021541Srgrimes return (EIO); 3031541Srgrimes return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 3041541Srgrimes} 3051541Srgrimes 3061541Srgrimes/* 3071541Srgrimes * Start output on pseudo-tty. 3081541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 3091541Srgrimes */ 31012819Sphkstatic void 3111541Srgrimesptsstart(tp) 3121541Srgrimes struct tty *tp; 3131541Srgrimes{ 31449536Sphk register struct pt_ioctl *pti = tp->t_dev->si_drv1; 3151541Srgrimes 3161541Srgrimes if (tp->t_state & TS_TTSTOP) 3171541Srgrimes return; 3181541Srgrimes if (pti->pt_flags & PF_STOPPED) { 3191541Srgrimes pti->pt_flags &= ~PF_STOPPED; 3201541Srgrimes pti->pt_send = TIOCPKT_START; 3211541Srgrimes } 3221541Srgrimes ptcwakeup(tp, FREAD); 3231541Srgrimes} 3241541Srgrimes 32512819Sphkstatic void 3261541Srgrimesptcwakeup(tp, flag) 3271541Srgrimes struct tty *tp; 3281541Srgrimes int flag; 3291541Srgrimes{ 33049536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 3311541Srgrimes 3321541Srgrimes if (flag & FREAD) { 3331541Srgrimes selwakeup(&pti->pt_selr); 3349639Sbde wakeup(TSA_PTC_READ(tp)); 3351541Srgrimes } 3361541Srgrimes if (flag & FWRITE) { 3371541Srgrimes selwakeup(&pti->pt_selw); 3389639Sbde wakeup(TSA_PTC_WRITE(tp)); 3391541Srgrimes } 3401541Srgrimes} 3411541Srgrimes 34212675Sjulianstatic int 3431541Srgrimesptcopen(dev, flag, devtype, p) 3441541Srgrimes dev_t dev; 3451541Srgrimes int flag, devtype; 3461541Srgrimes struct proc *p; 3471541Srgrimes{ 3481541Srgrimes register struct tty *tp; 3491541Srgrimes struct pt_ioctl *pti; 3501541Srgrimes 35149536Sphk if (!dev->si_drv1) 35249536Sphk ptyinit(minor(dev)); 35349536Sphk if (!dev->si_drv1) 35449536Sphk return(ENXIO); 35550652Sphk tp = dev->si_tty; 3561541Srgrimes if (tp->t_oproc) 3571541Srgrimes return (EIO); 3581541Srgrimes tp->t_oproc = ptsstart; 35951654Sphk tp->t_stop = ptsstop; 3601541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 1); 3611541Srgrimes tp->t_lflag &= ~EXTPROC; 36249536Sphk pti = dev->si_drv1; 36357070Srwatson pti->pt_prison = p->p_prison; 3641541Srgrimes pti->pt_flags = 0; 3651541Srgrimes pti->pt_send = 0; 3661541Srgrimes pti->pt_ucntl = 0; 3671541Srgrimes return (0); 3681541Srgrimes} 3691541Srgrimes 37012675Sjulianstatic int 37110624Sbdeptcclose(dev, flags, fmt, p) 3721541Srgrimes dev_t dev; 37310624Sbde int flags; 37410624Sbde int fmt; 37510624Sbde struct proc *p; 3761541Srgrimes{ 3771541Srgrimes register struct tty *tp; 3781541Srgrimes 37950652Sphk tp = dev->si_tty; 3801541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 0); 3819824Sbde 3829824Sbde /* 3839824Sbde * XXX MDMBUF makes no sense for ptys but would inhibit the above 3849824Sbde * l_modem(). CLOCAL makes sense but isn't supported. Special 3859824Sbde * l_modem()s that ignore carrier drop make no sense for ptys but 3869824Sbde * may be in use because other parts of the line discipline make 3879824Sbde * sense for ptys. Recover by doing everything that a normal 3889824Sbde * ttymodem() would have done except for sending a SIGHUP. 3899824Sbde */ 3909850Sbde if (tp->t_state & TS_ISOPEN) { 3919850Sbde tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 3929850Sbde tp->t_state |= TS_ZOMBIE; 3939850Sbde ttyflush(tp, FREAD | FWRITE); 3949850Sbde } 3959824Sbde 3961541Srgrimes tp->t_oproc = 0; /* mark closed */ 3971541Srgrimes return (0); 3981541Srgrimes} 3991541Srgrimes 40012675Sjulianstatic int 4011541Srgrimesptcread(dev, uio, flag) 4021541Srgrimes dev_t dev; 4031541Srgrimes struct uio *uio; 4041541Srgrimes int flag; 4051541Srgrimes{ 40650652Sphk register struct tty *tp = dev->si_tty; 40749536Sphk struct pt_ioctl *pti = dev->si_drv1; 4081541Srgrimes char buf[BUFSIZ]; 4091541Srgrimes int error = 0, cc; 4101541Srgrimes 4111541Srgrimes /* 4121541Srgrimes * We want to block until the slave 4131541Srgrimes * is open, and there's something to read; 4141541Srgrimes * but if we lost the slave or we're NBIO, 4151541Srgrimes * then return the appropriate error instead. 4161541Srgrimes */ 4171541Srgrimes for (;;) { 4181541Srgrimes if (tp->t_state&TS_ISOPEN) { 4191541Srgrimes if (pti->pt_flags&PF_PKT && pti->pt_send) { 4201541Srgrimes error = ureadc((int)pti->pt_send, uio); 4211541Srgrimes if (error) 4221541Srgrimes return (error); 4231541Srgrimes if (pti->pt_send & TIOCPKT_IOCTL) { 4241541Srgrimes cc = min(uio->uio_resid, 4251541Srgrimes sizeof(tp->t_termios)); 4262807Sbde uiomove((caddr_t)&tp->t_termios, cc, 4272807Sbde uio); 4281541Srgrimes } 4291541Srgrimes pti->pt_send = 0; 4301541Srgrimes return (0); 4311541Srgrimes } 4321541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 4331541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 4341541Srgrimes if (error) 4351541Srgrimes return (error); 4361541Srgrimes pti->pt_ucntl = 0; 4371541Srgrimes return (0); 4381541Srgrimes } 4391541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4401541Srgrimes break; 4411541Srgrimes } 4429824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4431541Srgrimes return (0); /* EOF */ 4441541Srgrimes if (flag & IO_NDELAY) 4451541Srgrimes return (EWOULDBLOCK); 4469639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4473308Sphk if (error) 4481541Srgrimes return (error); 4491541Srgrimes } 4501541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4511541Srgrimes error = ureadc(0, uio); 4521541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4531541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4541541Srgrimes if (cc <= 0) 4551541Srgrimes break; 4561541Srgrimes error = uiomove(buf, cc, uio); 4571541Srgrimes } 4589626Sbde ttwwakeup(tp); 4591541Srgrimes return (error); 4601541Srgrimes} 4611541Srgrimes 46212675Sjulianstatic void 4631541Srgrimesptsstop(tp, flush) 4641541Srgrimes register struct tty *tp; 4651541Srgrimes int flush; 4661541Srgrimes{ 46749536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 4681541Srgrimes int flag; 4691541Srgrimes 4701541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4711541Srgrimes if (flush == 0) { 4721541Srgrimes flush = TIOCPKT_STOP; 4731541Srgrimes pti->pt_flags |= PF_STOPPED; 4741541Srgrimes } else 4751541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4761541Srgrimes pti->pt_send |= flush; 4771541Srgrimes /* change of perspective */ 4781541Srgrimes flag = 0; 4791541Srgrimes if (flush & FREAD) 4801541Srgrimes flag |= FWRITE; 4811541Srgrimes if (flush & FWRITE) 4821541Srgrimes flag |= FREAD; 4831541Srgrimes ptcwakeup(tp, flag); 4841541Srgrimes} 4851541Srgrimes 48612675Sjulianstatic int 48729354Speterptcpoll(dev, events, p) 4881541Srgrimes dev_t dev; 48929354Speter int events; 4901541Srgrimes struct proc *p; 4911541Srgrimes{ 49250652Sphk register struct tty *tp = dev->si_tty; 49349536Sphk struct pt_ioctl *pti = dev->si_drv1; 49429354Speter int revents = 0; 4951541Srgrimes int s; 4961541Srgrimes 4979824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 49829354Speter return (seltrue(dev, events, p) | POLLHUP); 4991541Srgrimes 50029354Speter /* 50129354Speter * Need to block timeouts (ttrstart). 50229354Speter */ 50329354Speter s = spltty(); 5041541Srgrimes 50529354Speter if (events & (POLLIN | POLLRDNORM)) 50629354Speter if ((tp->t_state & TS_ISOPEN) && 50729354Speter ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 50829354Speter ((pti->pt_flags & PF_PKT) && pti->pt_send) || 50929354Speter ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 51029354Speter revents |= events & (POLLIN | POLLRDNORM); 5111541Srgrimes 51229354Speter if (events & (POLLOUT | POLLWRNORM)) 51329354Speter if (tp->t_state & TS_ISOPEN && 51429354Speter ((pti->pt_flags & PF_REMOTE) ? 51529354Speter (tp->t_canq.c_cc == 0) : 51629354Speter ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 51729354Speter (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 51829354Speter revents |= events & (POLLOUT | POLLWRNORM); 5191541Srgrimes 52029354Speter if (events & POLLHUP) 52129354Speter if ((tp->t_state & TS_CARR_ON) == 0) 52229354Speter revents |= POLLHUP; 5231541Srgrimes 52429354Speter if (revents == 0) { 52529354Speter if (events & (POLLIN | POLLRDNORM)) 52629354Speter selrecord(p, &pti->pt_selr); 52729354Speter 52829354Speter if (events & (POLLOUT | POLLWRNORM)) 52929354Speter selrecord(p, &pti->pt_selw); 5301541Srgrimes } 53129354Speter splx(s); 53229354Speter 53329354Speter return (revents); 5341541Srgrimes} 5351541Srgrimes 53612675Sjulianstatic int 5371541Srgrimesptcwrite(dev, uio, flag) 5381541Srgrimes dev_t dev; 5391541Srgrimes register struct uio *uio; 5401541Srgrimes int flag; 5411541Srgrimes{ 54250652Sphk register struct tty *tp = dev->si_tty; 5431549Srgrimes register u_char *cp = 0; 5441541Srgrimes register int cc = 0; 5451541Srgrimes u_char locbuf[BUFSIZ]; 5461541Srgrimes int cnt = 0; 54749536Sphk struct pt_ioctl *pti = dev->si_drv1; 5481541Srgrimes int error = 0; 5491541Srgrimes 5501541Srgrimesagain: 5511541Srgrimes if ((tp->t_state&TS_ISOPEN) == 0) 5521541Srgrimes goto block; 5531541Srgrimes if (pti->pt_flags & PF_REMOTE) { 5541541Srgrimes if (tp->t_canq.c_cc) 5551541Srgrimes goto block; 55611789Sbde while ((uio->uio_resid > 0 || cc > 0) && 55711789Sbde tp->t_canq.c_cc < TTYHOG - 1) { 5581541Srgrimes if (cc == 0) { 5591541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5601541Srgrimes cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 5611541Srgrimes cp = locbuf; 5621541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5631541Srgrimes if (error) 5641541Srgrimes return (error); 5651541Srgrimes /* check again for safety */ 56611789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 56711789Sbde /* adjust as usual */ 56811789Sbde uio->uio_resid += cc; 5691541Srgrimes return (EIO); 57011789Sbde } 5711541Srgrimes } 57215199Sbde if (cc > 0) { 57315199Sbde cc = b_to_q((char *)cp, cc, &tp->t_canq); 57415199Sbde /* 57515199Sbde * XXX we don't guarantee that the canq size 57615199Sbde * is >= TTYHOG, so the above b_to_q() may 57715199Sbde * leave some bytes uncopied. However, space 57815199Sbde * is guaranteed for the null terminator if 57915199Sbde * we don't fail here since (TTYHOG - 1) is 58015199Sbde * not a multiple of CBSIZE. 58115199Sbde */ 58215199Sbde if (cc > 0) 58315199Sbde break; 58415199Sbde } 5851541Srgrimes } 58611789Sbde /* adjust for data copied in but not written */ 58711789Sbde uio->uio_resid += cc; 5881541Srgrimes (void) putc(0, &tp->t_canq); 5891541Srgrimes ttwakeup(tp); 5909639Sbde wakeup(TSA_PTS_READ(tp)); 5911541Srgrimes return (0); 5921541Srgrimes } 59311789Sbde while (uio->uio_resid > 0 || cc > 0) { 5941541Srgrimes if (cc == 0) { 5951541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5961541Srgrimes cp = locbuf; 5971541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5981541Srgrimes if (error) 5991541Srgrimes return (error); 6001541Srgrimes /* check again for safety */ 60111789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 60211789Sbde /* adjust for data copied in but not written */ 60311789Sbde uio->uio_resid += cc; 6041541Srgrimes return (EIO); 60511789Sbde } 6061541Srgrimes } 6071541Srgrimes while (cc > 0) { 6081541Srgrimes if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 6091541Srgrimes (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 6109824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 6111541Srgrimes goto block; 6121541Srgrimes } 6131541Srgrimes (*linesw[tp->t_line].l_rint)(*cp++, tp); 6141541Srgrimes cnt++; 6151541Srgrimes cc--; 6161541Srgrimes } 6171541Srgrimes cc = 0; 6181541Srgrimes } 6191541Srgrimes return (0); 6201541Srgrimesblock: 6211541Srgrimes /* 6221541Srgrimes * Come here to wait for slave to open, for space 62315199Sbde * in outq, or space in rawq, or an empty canq. 6241541Srgrimes */ 62511789Sbde if ((tp->t_state & TS_CONNECTED) == 0) { 62611789Sbde /* adjust for data copied in but not written */ 62711789Sbde uio->uio_resid += cc; 6281541Srgrimes return (EIO); 62911789Sbde } 6301541Srgrimes if (flag & IO_NDELAY) { 6311541Srgrimes /* adjust for data copied in but not written */ 6321541Srgrimes uio->uio_resid += cc; 6331541Srgrimes if (cnt == 0) 6341541Srgrimes return (EWOULDBLOCK); 6351541Srgrimes return (0); 6361541Srgrimes } 6379639Sbde error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 6383308Sphk if (error) { 6391541Srgrimes /* adjust for data copied in but not written */ 6401541Srgrimes uio->uio_resid += cc; 6411541Srgrimes return (error); 6421541Srgrimes } 6431541Srgrimes goto again; 6441541Srgrimes} 6451541Srgrimes 6461541Srgrimes/*ARGSUSED*/ 64712675Sjulianstatic int 6481541Srgrimesptyioctl(dev, cmd, data, flag, p) 6491541Srgrimes dev_t dev; 65036735Sdfr u_long cmd; 6511541Srgrimes caddr_t data; 6521541Srgrimes int flag; 6531541Srgrimes struct proc *p; 6541541Srgrimes{ 65550652Sphk register struct tty *tp = dev->si_tty; 65649536Sphk register struct pt_ioctl *pti = dev->si_drv1; 6571541Srgrimes register u_char *cc = tp->t_cc; 6581541Srgrimes int stop, error; 6591541Srgrimes 66047301Sluoqi if (devsw(dev)->d_open == ptcopen) { 6611541Srgrimes switch (cmd) { 6621541Srgrimes 6631541Srgrimes case TIOCGPGRP: 6641541Srgrimes /* 66533826Sbde * We avoid calling ttioctl on the controller since, 6661541Srgrimes * in that case, tp must be the controlling terminal. 6671541Srgrimes */ 6681541Srgrimes *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 6691541Srgrimes return (0); 6701541Srgrimes 6711541Srgrimes case TIOCPKT: 6721541Srgrimes if (*(int *)data) { 6731541Srgrimes if (pti->pt_flags & PF_UCNTL) 6741541Srgrimes return (EINVAL); 6751541Srgrimes pti->pt_flags |= PF_PKT; 6761541Srgrimes } else 6771541Srgrimes pti->pt_flags &= ~PF_PKT; 6781541Srgrimes return (0); 6791541Srgrimes 6801541Srgrimes case TIOCUCNTL: 6811541Srgrimes if (*(int *)data) { 6821541Srgrimes if (pti->pt_flags & PF_PKT) 6831541Srgrimes return (EINVAL); 6841541Srgrimes pti->pt_flags |= PF_UCNTL; 6851541Srgrimes } else 6861541Srgrimes pti->pt_flags &= ~PF_UCNTL; 6871541Srgrimes return (0); 6881541Srgrimes 6891541Srgrimes case TIOCREMOTE: 6901541Srgrimes if (*(int *)data) 6911541Srgrimes pti->pt_flags |= PF_REMOTE; 6921541Srgrimes else 6931541Srgrimes pti->pt_flags &= ~PF_REMOTE; 6941541Srgrimes ttyflush(tp, FREAD|FWRITE); 6951541Srgrimes return (0); 69647203Sluoqi } 6971541Srgrimes 69847203Sluoqi /* 69947203Sluoqi * The rest of the ioctls shouldn't be called until 70047301Sluoqi * the slave is open. 70147203Sluoqi */ 70247203Sluoqi if ((tp->t_state & TS_ISOPEN) == 0) 70347301Sluoqi return (EAGAIN); 70447203Sluoqi 70547203Sluoqi switch (cmd) { 7061541Srgrimes#ifdef COMPAT_43 7078876Srgrimes case TIOCSETP: 7081541Srgrimes case TIOCSETN: 7091541Srgrimes#endif 7101541Srgrimes case TIOCSETD: 7111541Srgrimes case TIOCSETA: 7121541Srgrimes case TIOCSETAW: 7139858Sache case TIOCSETAF: 71447301Sluoqi /* 71547301Sluoqi * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 71647301Sluoqi * ttywflush(tp) will hang if there are characters in 71747301Sluoqi * the outq. 71847301Sluoqi */ 7191541Srgrimes ndflush(&tp->t_outq, tp->t_outq.c_cc); 7201541Srgrimes break; 7211541Srgrimes 7221541Srgrimes case TIOCSIG: 72327770Sjmg if (*(unsigned int *)data >= NSIG || 72427770Sjmg *(unsigned int *)data == 0) 7251541Srgrimes return(EINVAL); 7261541Srgrimes if ((tp->t_lflag&NOFLSH) == 0) 7271541Srgrimes ttyflush(tp, FREAD|FWRITE); 7281541Srgrimes pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 7291541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7301541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7311541Srgrimes ttyinfo(tp); 7321541Srgrimes return(0); 7331541Srgrimes } 73447203Sluoqi } 73547301Sluoqi if (cmd == TIOCEXT) { 73647301Sluoqi /* 73747301Sluoqi * When the EXTPROC bit is being toggled, we need 73847301Sluoqi * to send an TIOCPKT_IOCTL if the packet driver 73947301Sluoqi * is turned on. 74047301Sluoqi */ 74147301Sluoqi if (*(int *)data) { 74247301Sluoqi if (pti->pt_flags & PF_PKT) { 74347301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 74447301Sluoqi ptcwakeup(tp, FREAD); 74547301Sluoqi } 74647301Sluoqi tp->t_lflag |= EXTPROC; 74747301Sluoqi } else { 74847301Sluoqi if ((tp->t_lflag & EXTPROC) && 74947301Sluoqi (pti->pt_flags & PF_PKT)) { 75047301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 75147301Sluoqi ptcwakeup(tp, FREAD); 75247301Sluoqi } 75347301Sluoqi tp->t_lflag &= ~EXTPROC; 75447301Sluoqi } 75547301Sluoqi return(0); 75647301Sluoqi } 7571541Srgrimes error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 75831577Sbde if (error == ENOIOCTL) 7591541Srgrimes error = ttioctl(tp, cmd, data, flag); 76031577Sbde if (error == ENOIOCTL) { 7611541Srgrimes if (pti->pt_flags & PF_UCNTL && 7621541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7631541Srgrimes if (cmd & 0xff) { 7641541Srgrimes pti->pt_ucntl = (u_char)cmd; 7651541Srgrimes ptcwakeup(tp, FREAD); 7661541Srgrimes } 7671541Srgrimes return (0); 7681541Srgrimes } 7691541Srgrimes error = ENOTTY; 7701541Srgrimes } 7711541Srgrimes /* 7721541Srgrimes * If external processing and packet mode send ioctl packet. 7731541Srgrimes */ 7741541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7751541Srgrimes switch(cmd) { 7761541Srgrimes case TIOCSETA: 7771541Srgrimes case TIOCSETAW: 7781541Srgrimes case TIOCSETAF: 7791541Srgrimes#ifdef COMPAT_43 7801541Srgrimes case TIOCSETP: 7811541Srgrimes case TIOCSETN: 7821541Srgrimes#endif 7831541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7841541Srgrimes case TIOCSETC: 7851541Srgrimes case TIOCSLTC: 7861541Srgrimes case TIOCLBIS: 7871541Srgrimes case TIOCLBIC: 7881541Srgrimes case TIOCLSET: 7891541Srgrimes#endif 7901541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7911541Srgrimes ptcwakeup(tp, FREAD); 7921541Srgrimes default: 7931541Srgrimes break; 7941541Srgrimes } 7951541Srgrimes } 7968876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 7971541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 7981541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 7991541Srgrimes if (stop) { 8001541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 8011541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 8021541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 8031541Srgrimes ptcwakeup(tp, FREAD); 8041541Srgrimes } 8051541Srgrimes } else { 8061541Srgrimes if (!stop) { 8071541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 8081541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 8091541Srgrimes pti->pt_flags |= PF_NOSTOP; 8101541Srgrimes ptcwakeup(tp, FREAD); 8111541Srgrimes } 8121541Srgrimes } 8131541Srgrimes return (error); 8141541Srgrimes} 81512517Sjulian 81612517Sjulian 81729506Sbdestatic void ptc_drvinit __P((void *unused)); 81849536Sphk 81912675Sjulianstatic void 82029506Sbdeptc_drvinit(unused) 82129506Sbde void *unused; 82212517Sjulian{ 82353483Sjkh cdevsw_add(&pts_cdevsw); 82453483Sjkh cdevsw_add(&ptc_cdevsw); 82550254Sphk /* XXX: Gross hack for DEVFS */ 82650254Sphk ptyinit(0); 82712517Sjulian} 82812517Sjulian 82912517SjulianSYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 830