pty.c revision 31778
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 3431778Seivind * $Id: tty_pty.c,v 1.48 1997/12/06 13:24:10 bde Exp $ 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 441541Srgrimes#include <sys/param.h> 451541Srgrimes#include <sys/systm.h> 4624207Sbde#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 4724207Sbde#include <sys/ioctl_compat.h> 4824207Sbde#endif 491541Srgrimes#include <sys/proc.h> 501541Srgrimes#include <sys/tty.h> 511541Srgrimes#include <sys/conf.h> 5224131Sbde#include <sys/fcntl.h> 5329354Speter#include <sys/poll.h> 541541Srgrimes#include <sys/kernel.h> 551541Srgrimes#include <sys/vnode.h> 563308Sphk#include <sys/signalvar.h> 571541Srgrimes 5812517Sjulian#ifdef DEVFS 5912517Sjulian#include <sys/devfsext.h> 6012517Sjulian#endif /*DEVFS*/ 6112517Sjulian 6216322Sgpalmer#ifdef notyet 6312819Sphkstatic void ptyattach __P((int n)); 6416322Sgpalmer#endif 6512819Sphkstatic void ptsstart __P((struct tty *tp)); 6612819Sphkstatic void ptcwakeup __P((struct tty *tp, int flag)); 6711789Sbde 6812675Sjulianstatic d_open_t ptsopen; 6912675Sjulianstatic d_close_t ptsclose; 7012675Sjulianstatic d_read_t ptsread; 7112675Sjulianstatic d_write_t ptswrite; 7212675Sjulianstatic d_ioctl_t ptyioctl; 7312675Sjulianstatic d_stop_t ptsstop; 7412731Sbdestatic d_devtotty_t ptydevtotty; 7512675Sjulianstatic d_open_t ptcopen; 7612675Sjulianstatic d_close_t ptcclose; 7712675Sjulianstatic d_read_t ptcread; 7812675Sjulianstatic d_write_t ptcwrite; 7929354Speterstatic d_poll_t ptcpoll; 8012675Sjulian 8112675Sjulian#define CDEV_MAJOR_S 5 8212675Sjulian#define CDEV_MAJOR_C 6 8312678Sphkstatic struct cdevsw pts_cdevsw = 8412675Sjulian { ptsopen, ptsclose, ptsread, ptswrite, /*5*/ 8512675Sjulian ptyioctl, ptsstop, nullreset, ptydevtotty,/* ttyp */ 8629354Speter ttpoll, nommap, NULL, "pts", NULL, -1 }; 8712675Sjulian 8812678Sphkstatic struct cdevsw ptc_cdevsw = 8912675Sjulian { ptcopen, ptcclose, ptcread, ptcwrite, /*6*/ 9012675Sjulian ptyioctl, nullstop, nullreset, ptydevtotty,/* ptyp */ 9129354Speter ptcpoll, nommap, NULL, "ptc", NULL, -1 }; 9212675Sjulian 9312675Sjulian 941541Srgrimes#if NPTY == 1 951541Srgrimes#undef NPTY 961541Srgrimes#define NPTY 32 /* crude XXX */ 9727770Sjmg#warning You have only one pty defined, redefining to 32. 981541Srgrimes#endif 991541Srgrimes 10027770Sjmg#ifdef DEVFS 10127770Sjmg#define MAXUNITS (8 * 32) 10227770Sjmgstatic void *devfs_token_pts[MAXUNITS]; 10327770Sjmgstatic void *devfs_token_ptc[MAXUNITS]; 10427770Sjmgstatic const char jnames[] = "pqrsPQRS"; 10527770Sjmg#if NPTY > MAXUNITS 10627770Sjmg#undef NPTY 10727770Sjmg#define NPTY MAXUNITS 10827770Sjmg#warning Can't have more than 256 pty's with DEVFS defined. 10927770Sjmg#endif 11027770Sjmg#endif 11127770Sjmg 1121541Srgrimes#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 1131541Srgrimes 1141541Srgrimes/* 11512564Sjulian * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 11612564Sjulian * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 1171541Srgrimes */ 11812819Sphkstatic struct tty pt_tty[NPTY]; /* XXX */ 11912819Sphkstatic struct pt_ioctl { 1201541Srgrimes int pt_flags; 1211541Srgrimes struct selinfo pt_selr, pt_selw; 1221541Srgrimes u_char pt_send; 1231541Srgrimes u_char pt_ucntl; 1241541Srgrimes} pt_ioctl[NPTY]; /* XXX */ 12512819Sphkstatic int npty = NPTY; /* for pstat -t */ 1261541Srgrimes 1271541Srgrimes#define PF_PKT 0x08 /* packet mode */ 1281541Srgrimes#define PF_STOPPED 0x10 /* user told stopped */ 1291541Srgrimes#define PF_REMOTE 0x20 /* remote and flow controlled input */ 1301541Srgrimes#define PF_NOSTOP 0x40 1311541Srgrimes#define PF_UCNTL 0x80 /* user control mode */ 1321541Srgrimes 13316322Sgpalmer#ifdef notyet 1341541Srgrimes/* 1351541Srgrimes * Establish n (or default if n is 1) ptys in the system. 1361541Srgrimes * 1371541Srgrimes * XXX cdevsw & pstat require the array `pty[]' to be an array 1381541Srgrimes */ 13912819Sphkstatic void 1401541Srgrimesptyattach(n) 1411541Srgrimes int n; 1421541Srgrimes{ 1431541Srgrimes char *mem; 1441541Srgrimes register u_long ntb; 1451541Srgrimes#define DEFAULT_NPTY 32 1461541Srgrimes 1471541Srgrimes /* maybe should allow 0 => none? */ 1481541Srgrimes if (n <= 1) 1491541Srgrimes n = DEFAULT_NPTY; 1501541Srgrimes ntb = n * sizeof(struct tty); 1511541Srgrimes mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 1521541Srgrimes M_DEVBUF, M_WAITOK); 1531541Srgrimes pt_tty = (struct tty *)mem; 1541541Srgrimes mem = (char *)ALIGN(mem + ntb); 1551541Srgrimes pt_ioctl = (struct pt_ioctl *)mem; 1561541Srgrimes npty = n; 15716322Sgpalmer} 1581541Srgrimes#endif 1591541Srgrimes 1601541Srgrimes/*ARGSUSED*/ 16112675Sjulianstatic int 1621541Srgrimesptsopen(dev, flag, devtype, p) 1631541Srgrimes dev_t dev; 1641541Srgrimes int flag, devtype; 1651541Srgrimes struct proc *p; 1661541Srgrimes{ 1671541Srgrimes register struct tty *tp; 1681541Srgrimes int error; 1691541Srgrimes 1701541Srgrimes if (minor(dev) >= npty) 1711541Srgrimes return (ENXIO); 1721541Srgrimes tp = &pt_tty[minor(dev)]; 1731541Srgrimes if ((tp->t_state & TS_ISOPEN) == 0) { 1741541Srgrimes ttychars(tp); /* Set up default chars */ 1751541Srgrimes tp->t_iflag = TTYDEF_IFLAG; 1761541Srgrimes tp->t_oflag = TTYDEF_OFLAG; 1771541Srgrimes tp->t_lflag = TTYDEF_LFLAG; 1781541Srgrimes tp->t_cflag = TTYDEF_CFLAG; 1791541Srgrimes tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 1801541Srgrimes ttsetwater(tp); /* would be done in xxparam() */ 1811541Srgrimes } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 1821541Srgrimes return (EBUSY); 1831541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 1849824Sbde (void)(*linesw[tp->t_line].l_modem)(tp, 1); 1851541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 1861541Srgrimes if (flag&FNONBLOCK) 1871541Srgrimes break; 1889639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1899624Sbde "ptsopn", 0); 1903308Sphk if (error) 1911541Srgrimes return (error); 1921541Srgrimes } 1931541Srgrimes error = (*linesw[tp->t_line].l_open)(dev, tp); 1947724Sache if (error == 0) 1957724Sache ptcwakeup(tp, FREAD|FWRITE); 1961541Srgrimes return (error); 1971541Srgrimes} 1981541Srgrimes 19912675Sjulianstatic int 2001541Srgrimesptsclose(dev, flag, mode, p) 2011541Srgrimes dev_t dev; 2021541Srgrimes int flag, mode; 2031541Srgrimes struct proc *p; 2041541Srgrimes{ 2051541Srgrimes register struct tty *tp; 2061541Srgrimes int err; 2071541Srgrimes 2081541Srgrimes tp = &pt_tty[minor(dev)]; 2091541Srgrimes err = (*linesw[tp->t_line].l_close)(tp, flag); 2107730Sache ptsstop(tp, FREAD|FWRITE); 2117724Sache (void) ttyclose(tp); 2121541Srgrimes return (err); 2131541Srgrimes} 2141541Srgrimes 21512675Sjulianstatic int 2161541Srgrimesptsread(dev, uio, flag) 2171541Srgrimes dev_t dev; 2181541Srgrimes struct uio *uio; 2191541Srgrimes int flag; 2201541Srgrimes{ 2211541Srgrimes struct proc *p = curproc; 2221541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 2231541Srgrimes register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 2241541Srgrimes int error = 0; 2251541Srgrimes 2261541Srgrimesagain: 2271541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2281541Srgrimes while (isbackground(p, tp)) { 2291541Srgrimes if ((p->p_sigignore & sigmask(SIGTTIN)) || 2301541Srgrimes (p->p_sigmask & sigmask(SIGTTIN)) || 2311541Srgrimes p->p_pgrp->pg_jobc == 0 || 2321541Srgrimes p->p_flag & P_PPWAIT) 2331541Srgrimes return (EIO); 2341541Srgrimes pgsignal(p->p_pgrp, SIGTTIN, 1); 2359624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2369624Sbde 0); 2373308Sphk if (error) 2381541Srgrimes return (error); 2391541Srgrimes } 2401541Srgrimes if (tp->t_canq.c_cc == 0) { 2411541Srgrimes if (flag & IO_NDELAY) 2421541Srgrimes return (EWOULDBLOCK); 2439639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2449624Sbde "ptsin", 0); 2453308Sphk if (error) 2461541Srgrimes return (error); 2471541Srgrimes goto again; 2481541Srgrimes } 2491541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2501541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2511541Srgrimes error = EFAULT; 2521541Srgrimes break; 2531541Srgrimes } 2541541Srgrimes if (tp->t_canq.c_cc == 1) 2551541Srgrimes (void) getc(&tp->t_canq); 2561541Srgrimes if (tp->t_canq.c_cc) 2571541Srgrimes return (error); 2581541Srgrimes } else 2591541Srgrimes if (tp->t_oproc) 2601541Srgrimes error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 2611541Srgrimes ptcwakeup(tp, FWRITE); 2621541Srgrimes return (error); 2631541Srgrimes} 2641541Srgrimes 2651541Srgrimes/* 2661541Srgrimes * Write to pseudo-tty. 2671541Srgrimes * Wakeups of controlling tty will happen 2681541Srgrimes * indirectly, when tty driver calls ptsstart. 2691541Srgrimes */ 27012675Sjulianstatic int 2711541Srgrimesptswrite(dev, uio, flag) 2721541Srgrimes dev_t dev; 2731541Srgrimes struct uio *uio; 2741541Srgrimes int flag; 2751541Srgrimes{ 2761541Srgrimes register struct tty *tp; 2771541Srgrimes 2781541Srgrimes tp = &pt_tty[minor(dev)]; 2791541Srgrimes if (tp->t_oproc == 0) 2801541Srgrimes return (EIO); 2811541Srgrimes return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2821541Srgrimes} 2831541Srgrimes 2841541Srgrimes/* 2851541Srgrimes * Start output on pseudo-tty. 2861541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 2871541Srgrimes */ 28812819Sphkstatic void 2891541Srgrimesptsstart(tp) 2901541Srgrimes struct tty *tp; 2911541Srgrimes{ 2921541Srgrimes register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 2931541Srgrimes 2941541Srgrimes if (tp->t_state & TS_TTSTOP) 2951541Srgrimes return; 2961541Srgrimes if (pti->pt_flags & PF_STOPPED) { 2971541Srgrimes pti->pt_flags &= ~PF_STOPPED; 2981541Srgrimes pti->pt_send = TIOCPKT_START; 2991541Srgrimes } 3001541Srgrimes ptcwakeup(tp, FREAD); 3011541Srgrimes} 3021541Srgrimes 30312819Sphkstatic void 3041541Srgrimesptcwakeup(tp, flag) 3051541Srgrimes struct tty *tp; 3061541Srgrimes int flag; 3071541Srgrimes{ 3081541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 3091541Srgrimes 3101541Srgrimes if (flag & FREAD) { 3111541Srgrimes selwakeup(&pti->pt_selr); 3129639Sbde wakeup(TSA_PTC_READ(tp)); 3131541Srgrimes } 3141541Srgrimes if (flag & FWRITE) { 3151541Srgrimes selwakeup(&pti->pt_selw); 3169639Sbde wakeup(TSA_PTC_WRITE(tp)); 3171541Srgrimes } 3181541Srgrimes} 3191541Srgrimes 32012675Sjulianstatic int 3211541Srgrimesptcopen(dev, flag, devtype, p) 3221541Srgrimes dev_t dev; 3231541Srgrimes int flag, devtype; 3241541Srgrimes struct proc *p; 3251541Srgrimes{ 3261541Srgrimes register struct tty *tp; 3271541Srgrimes struct pt_ioctl *pti; 3281541Srgrimes 3291541Srgrimes if (minor(dev) >= npty) 3301541Srgrimes return (ENXIO); 3311541Srgrimes tp = &pt_tty[minor(dev)]; 3321541Srgrimes if (tp->t_oproc) 3331541Srgrimes return (EIO); 3341541Srgrimes tp->t_oproc = ptsstart; 3351541Srgrimes#ifdef sun4c 3361541Srgrimes tp->t_stop = ptsstop; 3371541Srgrimes#endif 3381541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 1); 3391541Srgrimes tp->t_lflag &= ~EXTPROC; 3401541Srgrimes pti = &pt_ioctl[minor(dev)]; 3411541Srgrimes pti->pt_flags = 0; 3421541Srgrimes pti->pt_send = 0; 3431541Srgrimes pti->pt_ucntl = 0; 3441541Srgrimes return (0); 3451541Srgrimes} 3461541Srgrimes 34712675Sjulianstatic int 34810624Sbdeptcclose(dev, flags, fmt, p) 3491541Srgrimes dev_t dev; 35010624Sbde int flags; 35110624Sbde int fmt; 35210624Sbde struct proc *p; 3531541Srgrimes{ 3541541Srgrimes register struct tty *tp; 3551541Srgrimes 3561541Srgrimes tp = &pt_tty[minor(dev)]; 3571541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 0); 3589824Sbde 3599824Sbde /* 3609824Sbde * XXX MDMBUF makes no sense for ptys but would inhibit the above 3619824Sbde * l_modem(). CLOCAL makes sense but isn't supported. Special 3629824Sbde * l_modem()s that ignore carrier drop make no sense for ptys but 3639824Sbde * may be in use because other parts of the line discipline make 3649824Sbde * sense for ptys. Recover by doing everything that a normal 3659824Sbde * ttymodem() would have done except for sending a SIGHUP. 3669824Sbde */ 3679850Sbde if (tp->t_state & TS_ISOPEN) { 3689850Sbde tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 3699850Sbde tp->t_state |= TS_ZOMBIE; 3709850Sbde ttyflush(tp, FREAD | FWRITE); 3719850Sbde } 3729824Sbde 3731541Srgrimes tp->t_oproc = 0; /* mark closed */ 3741541Srgrimes return (0); 3751541Srgrimes} 3761541Srgrimes 37712675Sjulianstatic int 3781541Srgrimesptcread(dev, uio, flag) 3791541Srgrimes dev_t dev; 3801541Srgrimes struct uio *uio; 3811541Srgrimes int flag; 3821541Srgrimes{ 3831541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 3841541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 3851541Srgrimes char buf[BUFSIZ]; 3861541Srgrimes int error = 0, cc; 3871541Srgrimes 3881541Srgrimes /* 3891541Srgrimes * We want to block until the slave 3901541Srgrimes * is open, and there's something to read; 3911541Srgrimes * but if we lost the slave or we're NBIO, 3921541Srgrimes * then return the appropriate error instead. 3931541Srgrimes */ 3941541Srgrimes for (;;) { 3951541Srgrimes if (tp->t_state&TS_ISOPEN) { 3961541Srgrimes if (pti->pt_flags&PF_PKT && pti->pt_send) { 3971541Srgrimes error = ureadc((int)pti->pt_send, uio); 3981541Srgrimes if (error) 3991541Srgrimes return (error); 4001541Srgrimes if (pti->pt_send & TIOCPKT_IOCTL) { 4011541Srgrimes cc = min(uio->uio_resid, 4021541Srgrimes sizeof(tp->t_termios)); 4032807Sbde uiomove((caddr_t)&tp->t_termios, cc, 4042807Sbde uio); 4051541Srgrimes } 4061541Srgrimes pti->pt_send = 0; 4071541Srgrimes return (0); 4081541Srgrimes } 4091541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 4101541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 4111541Srgrimes if (error) 4121541Srgrimes return (error); 4131541Srgrimes pti->pt_ucntl = 0; 4141541Srgrimes return (0); 4151541Srgrimes } 4161541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4171541Srgrimes break; 4181541Srgrimes } 4199824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4201541Srgrimes return (0); /* EOF */ 4211541Srgrimes if (flag & IO_NDELAY) 4221541Srgrimes return (EWOULDBLOCK); 4239639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4243308Sphk if (error) 4251541Srgrimes return (error); 4261541Srgrimes } 4271541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4281541Srgrimes error = ureadc(0, uio); 4291541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4301541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4311541Srgrimes if (cc <= 0) 4321541Srgrimes break; 4331541Srgrimes error = uiomove(buf, cc, uio); 4341541Srgrimes } 4359626Sbde ttwwakeup(tp); 4361541Srgrimes return (error); 4371541Srgrimes} 4381541Srgrimes 43912675Sjulianstatic void 4401541Srgrimesptsstop(tp, flush) 4411541Srgrimes register struct tty *tp; 4421541Srgrimes int flush; 4431541Srgrimes{ 4441541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 4451541Srgrimes int flag; 4461541Srgrimes 4471541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4481541Srgrimes if (flush == 0) { 4491541Srgrimes flush = TIOCPKT_STOP; 4501541Srgrimes pti->pt_flags |= PF_STOPPED; 4511541Srgrimes } else 4521541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4531541Srgrimes pti->pt_send |= flush; 4541541Srgrimes /* change of perspective */ 4551541Srgrimes flag = 0; 4561541Srgrimes if (flush & FREAD) 4571541Srgrimes flag |= FWRITE; 4581541Srgrimes if (flush & FWRITE) 4591541Srgrimes flag |= FREAD; 4601541Srgrimes ptcwakeup(tp, flag); 4611541Srgrimes} 4621541Srgrimes 46312675Sjulianstatic int 46429354Speterptcpoll(dev, events, p) 4651541Srgrimes dev_t dev; 46629354Speter int events; 4671541Srgrimes struct proc *p; 4681541Srgrimes{ 4691541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 4701541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 47129354Speter int revents = 0; 4721541Srgrimes int s; 4731541Srgrimes 4749824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 47529354Speter return (seltrue(dev, events, p) | POLLHUP); 4761541Srgrimes 47729354Speter /* 47829354Speter * Need to block timeouts (ttrstart). 47929354Speter */ 48029354Speter s = spltty(); 4811541Srgrimes 48229354Speter if (events & (POLLIN | POLLRDNORM)) 48329354Speter if ((tp->t_state & TS_ISOPEN) && 48429354Speter ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || 48529354Speter ((pti->pt_flags & PF_PKT) && pti->pt_send) || 48629354Speter ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) 48729354Speter revents |= events & (POLLIN | POLLRDNORM); 4881541Srgrimes 48929354Speter if (events & (POLLOUT | POLLWRNORM)) 49029354Speter if (tp->t_state & TS_ISOPEN && 49129354Speter ((pti->pt_flags & PF_REMOTE) ? 49229354Speter (tp->t_canq.c_cc == 0) : 49329354Speter ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 49429354Speter (tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON))))) 49529354Speter revents |= events & (POLLOUT | POLLWRNORM); 4961541Srgrimes 49729354Speter if (events & POLLHUP) 49829354Speter if ((tp->t_state & TS_CARR_ON) == 0) 49929354Speter revents |= POLLHUP; 5001541Srgrimes 50129354Speter if (revents == 0) { 50229354Speter if (events & (POLLIN | POLLRDNORM)) 50329354Speter selrecord(p, &pti->pt_selr); 50429354Speter 50529354Speter if (events & (POLLOUT | POLLWRNORM)) 50629354Speter selrecord(p, &pti->pt_selw); 5071541Srgrimes } 50829354Speter splx(s); 50929354Speter 51029354Speter return (revents); 5111541Srgrimes} 5121541Srgrimes 51312675Sjulianstatic int 5141541Srgrimesptcwrite(dev, uio, flag) 5151541Srgrimes dev_t dev; 5161541Srgrimes register struct uio *uio; 5171541Srgrimes int flag; 5181541Srgrimes{ 5191541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 5201549Srgrimes register u_char *cp = 0; 5211541Srgrimes register int cc = 0; 5221541Srgrimes u_char locbuf[BUFSIZ]; 5231541Srgrimes int cnt = 0; 5241541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 5251541Srgrimes int error = 0; 5261541Srgrimes 5271541Srgrimesagain: 5281541Srgrimes if ((tp->t_state&TS_ISOPEN) == 0) 5291541Srgrimes goto block; 5301541Srgrimes if (pti->pt_flags & PF_REMOTE) { 5311541Srgrimes if (tp->t_canq.c_cc) 5321541Srgrimes goto block; 53311789Sbde while ((uio->uio_resid > 0 || cc > 0) && 53411789Sbde tp->t_canq.c_cc < TTYHOG - 1) { 5351541Srgrimes if (cc == 0) { 5361541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5371541Srgrimes cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 5381541Srgrimes cp = locbuf; 5391541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5401541Srgrimes if (error) 5411541Srgrimes return (error); 5421541Srgrimes /* check again for safety */ 54311789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 54411789Sbde /* adjust as usual */ 54511789Sbde uio->uio_resid += cc; 5461541Srgrimes return (EIO); 54711789Sbde } 5481541Srgrimes } 54915199Sbde if (cc > 0) { 55015199Sbde cc = b_to_q((char *)cp, cc, &tp->t_canq); 55115199Sbde /* 55215199Sbde * XXX we don't guarantee that the canq size 55315199Sbde * is >= TTYHOG, so the above b_to_q() may 55415199Sbde * leave some bytes uncopied. However, space 55515199Sbde * is guaranteed for the null terminator if 55615199Sbde * we don't fail here since (TTYHOG - 1) is 55715199Sbde * not a multiple of CBSIZE. 55815199Sbde */ 55915199Sbde if (cc > 0) 56015199Sbde break; 56115199Sbde } 5621541Srgrimes } 56311789Sbde /* adjust for data copied in but not written */ 56411789Sbde uio->uio_resid += cc; 5651541Srgrimes (void) putc(0, &tp->t_canq); 5661541Srgrimes ttwakeup(tp); 5679639Sbde wakeup(TSA_PTS_READ(tp)); 5681541Srgrimes return (0); 5691541Srgrimes } 57011789Sbde while (uio->uio_resid > 0 || cc > 0) { 5711541Srgrimes if (cc == 0) { 5721541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5731541Srgrimes cp = locbuf; 5741541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5751541Srgrimes if (error) 5761541Srgrimes return (error); 5771541Srgrimes /* check again for safety */ 57811789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 57911789Sbde /* adjust for data copied in but not written */ 58011789Sbde uio->uio_resid += cc; 5811541Srgrimes return (EIO); 58211789Sbde } 5831541Srgrimes } 5841541Srgrimes while (cc > 0) { 5851541Srgrimes if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 5861541Srgrimes (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 5879824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 5881541Srgrimes goto block; 5891541Srgrimes } 5901541Srgrimes (*linesw[tp->t_line].l_rint)(*cp++, tp); 5911541Srgrimes cnt++; 5921541Srgrimes cc--; 5931541Srgrimes } 5941541Srgrimes cc = 0; 5951541Srgrimes } 5961541Srgrimes return (0); 5971541Srgrimesblock: 5981541Srgrimes /* 5991541Srgrimes * Come here to wait for slave to open, for space 60015199Sbde * in outq, or space in rawq, or an empty canq. 6011541Srgrimes */ 60211789Sbde if ((tp->t_state & TS_CONNECTED) == 0) { 60311789Sbde /* adjust for data copied in but not written */ 60411789Sbde uio->uio_resid += cc; 6051541Srgrimes return (EIO); 60611789Sbde } 6071541Srgrimes if (flag & IO_NDELAY) { 6081541Srgrimes /* adjust for data copied in but not written */ 6091541Srgrimes uio->uio_resid += cc; 6101541Srgrimes if (cnt == 0) 6111541Srgrimes return (EWOULDBLOCK); 6121541Srgrimes return (0); 6131541Srgrimes } 6149639Sbde error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 6153308Sphk if (error) { 6161541Srgrimes /* adjust for data copied in but not written */ 6171541Srgrimes uio->uio_resid += cc; 6181541Srgrimes return (error); 6191541Srgrimes } 6201541Srgrimes goto again; 6211541Srgrimes} 6221541Srgrimes 62312675Sjulianstatic struct tty * 6246712Spstptydevtotty(dev) 6256712Spst dev_t dev; 6266712Spst{ 6276712Spst if (minor(dev) >= npty) 6286712Spst return (NULL); 6296712Spst 6306712Spst return &pt_tty[minor(dev)]; 6316712Spst} 6326712Spst 6331541Srgrimes/*ARGSUSED*/ 63412675Sjulianstatic int 6351541Srgrimesptyioctl(dev, cmd, data, flag, p) 6361541Srgrimes dev_t dev; 6371541Srgrimes int cmd; 6381541Srgrimes caddr_t data; 6391541Srgrimes int flag; 6401541Srgrimes struct proc *p; 6411541Srgrimes{ 6421541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 6431541Srgrimes register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 6441541Srgrimes register u_char *cc = tp->t_cc; 6451541Srgrimes int stop, error; 6461541Srgrimes 6471541Srgrimes /* 6481541Srgrimes * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 6491541Srgrimes * ttywflush(tp) will hang if there are characters in the outq. 6501541Srgrimes */ 6511541Srgrimes if (cmd == TIOCEXT) { 6521541Srgrimes /* 6531541Srgrimes * When the EXTPROC bit is being toggled, we need 6541541Srgrimes * to send an TIOCPKT_IOCTL if the packet driver 6551541Srgrimes * is turned on. 6561541Srgrimes */ 6571541Srgrimes if (*(int *)data) { 6581541Srgrimes if (pti->pt_flags & PF_PKT) { 6591541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 6601541Srgrimes ptcwakeup(tp, FREAD); 6611541Srgrimes } 6621541Srgrimes tp->t_lflag |= EXTPROC; 6631541Srgrimes } else { 66414511Shsu if ((tp->t_lflag & EXTPROC) && 6651541Srgrimes (pti->pt_flags & PF_PKT)) { 6661541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 6671541Srgrimes ptcwakeup(tp, FREAD); 6681541Srgrimes } 6691541Srgrimes tp->t_lflag &= ~EXTPROC; 6701541Srgrimes } 6711541Srgrimes return(0); 6721541Srgrimes } else 67312813Sjulian if (cdevsw[major(dev)]->d_open == ptcopen) 6741541Srgrimes switch (cmd) { 6751541Srgrimes 6761541Srgrimes case TIOCGPGRP: 6771541Srgrimes /* 6781541Srgrimes * We aviod calling ttioctl on the controller since, 6791541Srgrimes * in that case, tp must be the controlling terminal. 6801541Srgrimes */ 6811541Srgrimes *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; 6821541Srgrimes return (0); 6831541Srgrimes 6841541Srgrimes case TIOCPKT: 6851541Srgrimes if (*(int *)data) { 6861541Srgrimes if (pti->pt_flags & PF_UCNTL) 6871541Srgrimes return (EINVAL); 6881541Srgrimes pti->pt_flags |= PF_PKT; 6891541Srgrimes } else 6901541Srgrimes pti->pt_flags &= ~PF_PKT; 6911541Srgrimes return (0); 6921541Srgrimes 6931541Srgrimes case TIOCUCNTL: 6941541Srgrimes if (*(int *)data) { 6951541Srgrimes if (pti->pt_flags & PF_PKT) 6961541Srgrimes return (EINVAL); 6971541Srgrimes pti->pt_flags |= PF_UCNTL; 6981541Srgrimes } else 6991541Srgrimes pti->pt_flags &= ~PF_UCNTL; 7001541Srgrimes return (0); 7011541Srgrimes 7021541Srgrimes case TIOCREMOTE: 7031541Srgrimes if (*(int *)data) 7041541Srgrimes pti->pt_flags |= PF_REMOTE; 7051541Srgrimes else 7061541Srgrimes pti->pt_flags &= ~PF_REMOTE; 7071541Srgrimes ttyflush(tp, FREAD|FWRITE); 7081541Srgrimes return (0); 7091541Srgrimes 7101541Srgrimes#ifdef COMPAT_43 7118876Srgrimes case TIOCSETP: 7121541Srgrimes case TIOCSETN: 7131541Srgrimes#endif 7141541Srgrimes case TIOCSETD: 7151541Srgrimes case TIOCSETA: 7161541Srgrimes case TIOCSETAW: 7179858Sache case TIOCSETAF: 7181541Srgrimes ndflush(&tp->t_outq, tp->t_outq.c_cc); 7191541Srgrimes break; 7201541Srgrimes 7211541Srgrimes case TIOCSIG: 72227770Sjmg if (*(unsigned int *)data >= NSIG || 72327770Sjmg *(unsigned int *)data == 0) 7241541Srgrimes return(EINVAL); 7251541Srgrimes if ((tp->t_lflag&NOFLSH) == 0) 7261541Srgrimes ttyflush(tp, FREAD|FWRITE); 7271541Srgrimes pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 7281541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7291541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7301541Srgrimes ttyinfo(tp); 7311541Srgrimes return(0); 7321541Srgrimes } 7331541Srgrimes error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 73431577Sbde if (error == ENOIOCTL) 7351541Srgrimes error = ttioctl(tp, cmd, data, flag); 73631577Sbde if (error == ENOIOCTL) { 7371541Srgrimes if (pti->pt_flags & PF_UCNTL && 7381541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7391541Srgrimes if (cmd & 0xff) { 7401541Srgrimes pti->pt_ucntl = (u_char)cmd; 7411541Srgrimes ptcwakeup(tp, FREAD); 7421541Srgrimes } 7431541Srgrimes return (0); 7441541Srgrimes } 7451541Srgrimes error = ENOTTY; 7461541Srgrimes } 7471541Srgrimes /* 7481541Srgrimes * If external processing and packet mode send ioctl packet. 7491541Srgrimes */ 7501541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7511541Srgrimes switch(cmd) { 7521541Srgrimes case TIOCSETA: 7531541Srgrimes case TIOCSETAW: 7541541Srgrimes case TIOCSETAF: 7551541Srgrimes#ifdef COMPAT_43 7561541Srgrimes case TIOCSETP: 7571541Srgrimes case TIOCSETN: 7581541Srgrimes#endif 7591541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7601541Srgrimes case TIOCSETC: 7611541Srgrimes case TIOCSLTC: 7621541Srgrimes case TIOCLBIS: 7631541Srgrimes case TIOCLBIC: 7641541Srgrimes case TIOCLSET: 7651541Srgrimes#endif 7661541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7671541Srgrimes ptcwakeup(tp, FREAD); 7681541Srgrimes default: 7691541Srgrimes break; 7701541Srgrimes } 7711541Srgrimes } 7728876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 7731541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 7741541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 7751541Srgrimes if (stop) { 7761541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 7771541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 7781541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 7791541Srgrimes ptcwakeup(tp, FREAD); 7801541Srgrimes } 7811541Srgrimes } else { 7821541Srgrimes if (!stop) { 7831541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 7841541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 7851541Srgrimes pti->pt_flags |= PF_NOSTOP; 7861541Srgrimes ptcwakeup(tp, FREAD); 7871541Srgrimes } 7881541Srgrimes } 7891541Srgrimes return (error); 7901541Srgrimes} 79112517Sjulian 79212517Sjulianstatic ptc_devsw_installed = 0; 79312517Sjulian 79429506Sbdestatic void ptc_drvinit __P((void *unused)); 79512675Sjulianstatic void 79629506Sbdeptc_drvinit(unused) 79729506Sbde void *unused; 79812517Sjulian{ 79912517Sjulian#ifdef DEVFS 80012567Sjulian int i,j,k; 80112517Sjulian#endif 80212517Sjulian dev_t dev; 80312517Sjulian 80412517Sjulian if( ! ptc_devsw_installed ) { 80512675Sjulian dev = makedev(CDEV_MAJOR_S, 0); 80612675Sjulian cdevsw_add(&dev, &pts_cdevsw, NULL); 80712675Sjulian dev = makedev(CDEV_MAJOR_C, 0); 80812675Sjulian cdevsw_add(&dev, &ptc_cdevsw, NULL); 80912517Sjulian ptc_devsw_installed = 1; 81012517Sjulian#ifdef DEVFS 81112521Sjulian for ( i = 0 ; i<NPTY ; i++ ) { 81212564Sjulian j = i / 32; 81312564Sjulian k = i % 32; 81412675Sjulian devfs_token_pts[i] = 81513630Sphk devfs_add_devswf(&pts_cdevsw,i, 81613630Sphk DV_CHR,0,0,0666, 81713639Sphk "tty%c%n",jnames[j],k); 81812675Sjulian devfs_token_ptc[i] = 81913630Sphk devfs_add_devswf(&ptc_cdevsw,i, 82013630Sphk DV_CHR,0,0,0666, 82113639Sphk "pty%c%n",jnames[j],k); 82212521Sjulian } 82312521Sjulian#endif 82412517Sjulian } 82512517Sjulian} 82612517Sjulian 82712517SjulianSYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 828