pty.c revision 14511
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 3414511Shsu * $Id: tty_pty.c,v 1.38 1996/02/29 00:18:11 hsu Exp $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes/* 381541Srgrimes * Pseudo-teletype Driver 391541Srgrimes * (Actually two drivers, requiring two entries in 'cdevsw') 401541Srgrimes */ 411541Srgrimes#include "pty.h" /* XXX */ 421541Srgrimes 431541Srgrimes#include <sys/param.h> 441541Srgrimes#include <sys/systm.h> 451541Srgrimes#include <sys/ioctl.h> 461541Srgrimes#include <sys/proc.h> 471541Srgrimes#include <sys/tty.h> 481541Srgrimes#include <sys/conf.h> 491541Srgrimes#include <sys/file.h> 501541Srgrimes#include <sys/uio.h> 511541Srgrimes#include <sys/kernel.h> 521541Srgrimes#include <sys/vnode.h> 533308Sphk#include <sys/signalvar.h> 541541Srgrimes 5512517Sjulian#ifdef DEVFS 5612517Sjulian#include <sys/devfsext.h> 5712517Sjulian#endif /*DEVFS*/ 5812517Sjulian 5912819Sphkstatic void ptyattach __P((int n)); 6012819Sphkstatic void ptsstart __P((struct tty *tp)); 6112819Sphkstatic void ptcwakeup __P((struct tty *tp, int flag)); 6211789Sbde 6312675Sjulianstatic d_open_t ptsopen; 6412675Sjulianstatic d_close_t ptsclose; 6512675Sjulianstatic d_read_t ptsread; 6612675Sjulianstatic d_write_t ptswrite; 6712675Sjulianstatic d_ioctl_t ptyioctl; 6812675Sjulianstatic d_stop_t ptsstop; 6912731Sbdestatic d_devtotty_t ptydevtotty; 7012675Sjulianstatic d_open_t ptcopen; 7112675Sjulianstatic d_close_t ptcclose; 7212675Sjulianstatic d_read_t ptcread; 7312675Sjulianstatic d_write_t ptcwrite; 7412675Sjulianstatic d_ioctl_t ptcioctl; 7512675Sjulianstatic d_select_t ptcselect; 7612675Sjulian 7712675Sjulian#define CDEV_MAJOR_S 5 7812675Sjulian#define CDEV_MAJOR_C 6 7912678Sphkstatic struct cdevsw pts_cdevsw = 8012675Sjulian { ptsopen, ptsclose, ptsread, ptswrite, /*5*/ 8112675Sjulian ptyioctl, ptsstop, nullreset, ptydevtotty,/* ttyp */ 8212675Sjulian ttselect, nommap, NULL, "pts", NULL, -1 }; 8312675Sjulian 8412678Sphkstatic struct cdevsw ptc_cdevsw = 8512675Sjulian { ptcopen, ptcclose, ptcread, ptcwrite, /*6*/ 8612675Sjulian ptyioctl, nullstop, nullreset, ptydevtotty,/* ptyp */ 8712675Sjulian ptcselect, nommap, NULL, "ptc", NULL, -1 }; 8812675Sjulian 8912675Sjulian 901541Srgrimes#if NPTY == 1 911541Srgrimes#undef NPTY 921541Srgrimes#define NPTY 32 /* crude XXX */ 931541Srgrimes#endif 941541Srgrimes 951541Srgrimes#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 961541Srgrimes 971541Srgrimes/* 9812564Sjulian * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 9912564Sjulian * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 1001541Srgrimes */ 10112819Sphkstatic struct tty pt_tty[NPTY]; /* XXX */ 10212819Sphkstatic struct pt_ioctl { 1031541Srgrimes int pt_flags; 1041541Srgrimes struct selinfo pt_selr, pt_selw; 1051541Srgrimes u_char pt_send; 1061541Srgrimes u_char pt_ucntl; 1071541Srgrimes} pt_ioctl[NPTY]; /* XXX */ 10812819Sphkstatic int npty = NPTY; /* for pstat -t */ 1091541Srgrimes 1101541Srgrimes#define PF_PKT 0x08 /* packet mode */ 1111541Srgrimes#define PF_STOPPED 0x10 /* user told stopped */ 1121541Srgrimes#define PF_REMOTE 0x20 /* remote and flow controlled input */ 1131541Srgrimes#define PF_NOSTOP 0x40 1141541Srgrimes#define PF_UCNTL 0x80 /* user control mode */ 1151541Srgrimes 1161541Srgrimes/* 1171541Srgrimes * Establish n (or default if n is 1) ptys in the system. 1181541Srgrimes * 1191541Srgrimes * XXX cdevsw & pstat require the array `pty[]' to be an array 1201541Srgrimes */ 12112819Sphkstatic void 1221541Srgrimesptyattach(n) 1231541Srgrimes int n; 1241541Srgrimes{ 1251541Srgrimes#ifdef notyet 1261541Srgrimes char *mem; 1271541Srgrimes register u_long ntb; 1281541Srgrimes#define DEFAULT_NPTY 32 1291541Srgrimes 1301541Srgrimes /* maybe should allow 0 => none? */ 1311541Srgrimes if (n <= 1) 1321541Srgrimes n = DEFAULT_NPTY; 1331541Srgrimes ntb = n * sizeof(struct tty); 1341541Srgrimes mem = malloc(ntb + ALIGNBYTES + n * sizeof(struct pt_ioctl), 1351541Srgrimes M_DEVBUF, M_WAITOK); 1361541Srgrimes pt_tty = (struct tty *)mem; 1371541Srgrimes mem = (char *)ALIGN(mem + ntb); 1381541Srgrimes pt_ioctl = (struct pt_ioctl *)mem; 1391541Srgrimes npty = n; 1401541Srgrimes#endif 1411541Srgrimes} 1421541Srgrimes 1431541Srgrimes/*ARGSUSED*/ 14412675Sjulianstatic int 1451541Srgrimesptsopen(dev, flag, devtype, p) 1461541Srgrimes dev_t dev; 1471541Srgrimes int flag, devtype; 1481541Srgrimes struct proc *p; 1491541Srgrimes{ 1501541Srgrimes register struct tty *tp; 1511541Srgrimes int error; 1521541Srgrimes 1531541Srgrimes if (minor(dev) >= npty) 1541541Srgrimes return (ENXIO); 1551541Srgrimes tp = &pt_tty[minor(dev)]; 1561541Srgrimes if ((tp->t_state & TS_ISOPEN) == 0) { 1571541Srgrimes ttychars(tp); /* Set up default chars */ 1581541Srgrimes tp->t_iflag = TTYDEF_IFLAG; 1591541Srgrimes tp->t_oflag = TTYDEF_OFLAG; 1601541Srgrimes tp->t_lflag = TTYDEF_LFLAG; 1611541Srgrimes tp->t_cflag = TTYDEF_CFLAG; 1621541Srgrimes tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; 1631541Srgrimes ttsetwater(tp); /* would be done in xxparam() */ 1641541Srgrimes } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0) 1651541Srgrimes return (EBUSY); 1661541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 1679824Sbde (void)(*linesw[tp->t_line].l_modem)(tp, 1); 1681541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 1691541Srgrimes if (flag&FNONBLOCK) 1701541Srgrimes break; 1719639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1729624Sbde "ptsopn", 0); 1733308Sphk if (error) 1741541Srgrimes return (error); 1751541Srgrimes } 1761541Srgrimes error = (*linesw[tp->t_line].l_open)(dev, tp); 1777724Sache if (error == 0) 1787724Sache ptcwakeup(tp, FREAD|FWRITE); 1791541Srgrimes return (error); 1801541Srgrimes} 1811541Srgrimes 18212675Sjulianstatic int 1831541Srgrimesptsclose(dev, flag, mode, p) 1841541Srgrimes dev_t dev; 1851541Srgrimes int flag, mode; 1861541Srgrimes struct proc *p; 1871541Srgrimes{ 1881541Srgrimes register struct tty *tp; 1891541Srgrimes int err; 1901541Srgrimes 1911541Srgrimes tp = &pt_tty[minor(dev)]; 1921541Srgrimes err = (*linesw[tp->t_line].l_close)(tp, flag); 1937730Sache ptsstop(tp, FREAD|FWRITE); 1947724Sache (void) ttyclose(tp); 1951541Srgrimes return (err); 1961541Srgrimes} 1971541Srgrimes 19812675Sjulianstatic int 1991541Srgrimesptsread(dev, uio, flag) 2001541Srgrimes dev_t dev; 2011541Srgrimes struct uio *uio; 2021541Srgrimes int flag; 2031541Srgrimes{ 2041541Srgrimes struct proc *p = curproc; 2051541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 2061541Srgrimes register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 2071541Srgrimes int error = 0; 2081541Srgrimes 2091541Srgrimesagain: 2101541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2111541Srgrimes while (isbackground(p, tp)) { 2121541Srgrimes if ((p->p_sigignore & sigmask(SIGTTIN)) || 2131541Srgrimes (p->p_sigmask & sigmask(SIGTTIN)) || 2141541Srgrimes p->p_pgrp->pg_jobc == 0 || 2151541Srgrimes p->p_flag & P_PPWAIT) 2161541Srgrimes return (EIO); 2171541Srgrimes pgsignal(p->p_pgrp, SIGTTIN, 1); 2189624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2199624Sbde 0); 2203308Sphk if (error) 2211541Srgrimes return (error); 2221541Srgrimes } 2231541Srgrimes if (tp->t_canq.c_cc == 0) { 2241541Srgrimes if (flag & IO_NDELAY) 2251541Srgrimes return (EWOULDBLOCK); 2269639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2279624Sbde "ptsin", 0); 2283308Sphk if (error) 2291541Srgrimes return (error); 2301541Srgrimes goto again; 2311541Srgrimes } 2321541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2331541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2341541Srgrimes error = EFAULT; 2351541Srgrimes break; 2361541Srgrimes } 2371541Srgrimes if (tp->t_canq.c_cc == 1) 2381541Srgrimes (void) getc(&tp->t_canq); 2391541Srgrimes if (tp->t_canq.c_cc) 2401541Srgrimes return (error); 2411541Srgrimes } else 2421541Srgrimes if (tp->t_oproc) 2431541Srgrimes error = (*linesw[tp->t_line].l_read)(tp, uio, flag); 2441541Srgrimes ptcwakeup(tp, FWRITE); 2451541Srgrimes return (error); 2461541Srgrimes} 2471541Srgrimes 2481541Srgrimes/* 2491541Srgrimes * Write to pseudo-tty. 2501541Srgrimes * Wakeups of controlling tty will happen 2511541Srgrimes * indirectly, when tty driver calls ptsstart. 2521541Srgrimes */ 25312675Sjulianstatic int 2541541Srgrimesptswrite(dev, uio, flag) 2551541Srgrimes dev_t dev; 2561541Srgrimes struct uio *uio; 2571541Srgrimes int flag; 2581541Srgrimes{ 2591541Srgrimes register struct tty *tp; 2601541Srgrimes 2611541Srgrimes tp = &pt_tty[minor(dev)]; 2621541Srgrimes if (tp->t_oproc == 0) 2631541Srgrimes return (EIO); 2641541Srgrimes return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2651541Srgrimes} 2661541Srgrimes 2671541Srgrimes/* 2681541Srgrimes * Start output on pseudo-tty. 2691541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 2701541Srgrimes */ 27112819Sphkstatic void 2721541Srgrimesptsstart(tp) 2731541Srgrimes struct tty *tp; 2741541Srgrimes{ 2751541Srgrimes register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 2761541Srgrimes 2771541Srgrimes if (tp->t_state & TS_TTSTOP) 2781541Srgrimes return; 2791541Srgrimes if (pti->pt_flags & PF_STOPPED) { 2801541Srgrimes pti->pt_flags &= ~PF_STOPPED; 2811541Srgrimes pti->pt_send = TIOCPKT_START; 2821541Srgrimes } 2831541Srgrimes ptcwakeup(tp, FREAD); 2841541Srgrimes} 2851541Srgrimes 28612819Sphkstatic void 2871541Srgrimesptcwakeup(tp, flag) 2881541Srgrimes struct tty *tp; 2891541Srgrimes int flag; 2901541Srgrimes{ 2911541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 2921541Srgrimes 2931541Srgrimes if (flag & FREAD) { 2941541Srgrimes selwakeup(&pti->pt_selr); 2959639Sbde wakeup(TSA_PTC_READ(tp)); 2961541Srgrimes } 2971541Srgrimes if (flag & FWRITE) { 2981541Srgrimes selwakeup(&pti->pt_selw); 2999639Sbde wakeup(TSA_PTC_WRITE(tp)); 3001541Srgrimes } 3011541Srgrimes} 3021541Srgrimes 30312675Sjulianstatic int 3041541Srgrimesptcopen(dev, flag, devtype, p) 3051541Srgrimes dev_t dev; 3061541Srgrimes int flag, devtype; 3071541Srgrimes struct proc *p; 3081541Srgrimes{ 3091541Srgrimes register struct tty *tp; 3101541Srgrimes struct pt_ioctl *pti; 3111541Srgrimes 3121541Srgrimes if (minor(dev) >= npty) 3131541Srgrimes return (ENXIO); 3141541Srgrimes tp = &pt_tty[minor(dev)]; 3151541Srgrimes if (tp->t_oproc) 3161541Srgrimes return (EIO); 3171541Srgrimes tp->t_oproc = ptsstart; 3181541Srgrimes#ifdef sun4c 3191541Srgrimes tp->t_stop = ptsstop; 3201541Srgrimes#endif 3211541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 1); 3221541Srgrimes tp->t_lflag &= ~EXTPROC; 3231541Srgrimes pti = &pt_ioctl[minor(dev)]; 3241541Srgrimes pti->pt_flags = 0; 3251541Srgrimes pti->pt_send = 0; 3261541Srgrimes pti->pt_ucntl = 0; 3271541Srgrimes return (0); 3281541Srgrimes} 3291541Srgrimes 33012675Sjulianstatic int 33110624Sbdeptcclose(dev, flags, fmt, p) 3321541Srgrimes dev_t dev; 33310624Sbde int flags; 33410624Sbde int fmt; 33510624Sbde struct proc *p; 3361541Srgrimes{ 3371541Srgrimes register struct tty *tp; 3381541Srgrimes 3391541Srgrimes tp = &pt_tty[minor(dev)]; 3401541Srgrimes (void)(*linesw[tp->t_line].l_modem)(tp, 0); 3419824Sbde 3429824Sbde /* 3439824Sbde * XXX MDMBUF makes no sense for ptys but would inhibit the above 3449824Sbde * l_modem(). CLOCAL makes sense but isn't supported. Special 3459824Sbde * l_modem()s that ignore carrier drop make no sense for ptys but 3469824Sbde * may be in use because other parts of the line discipline make 3479824Sbde * sense for ptys. Recover by doing everything that a normal 3489824Sbde * ttymodem() would have done except for sending a SIGHUP. 3499824Sbde */ 3509850Sbde if (tp->t_state & TS_ISOPEN) { 3519850Sbde tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); 3529850Sbde tp->t_state |= TS_ZOMBIE; 3539850Sbde ttyflush(tp, FREAD | FWRITE); 3549850Sbde } 3559824Sbde 3561541Srgrimes tp->t_oproc = 0; /* mark closed */ 3571541Srgrimes return (0); 3581541Srgrimes} 3591541Srgrimes 36012675Sjulianstatic int 3611541Srgrimesptcread(dev, uio, flag) 3621541Srgrimes dev_t dev; 3631541Srgrimes struct uio *uio; 3641541Srgrimes int flag; 3651541Srgrimes{ 3661541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 3671541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 3681541Srgrimes char buf[BUFSIZ]; 3691541Srgrimes int error = 0, cc; 3701541Srgrimes 3711541Srgrimes /* 3721541Srgrimes * We want to block until the slave 3731541Srgrimes * is open, and there's something to read; 3741541Srgrimes * but if we lost the slave or we're NBIO, 3751541Srgrimes * then return the appropriate error instead. 3761541Srgrimes */ 3771541Srgrimes for (;;) { 3781541Srgrimes if (tp->t_state&TS_ISOPEN) { 3791541Srgrimes if (pti->pt_flags&PF_PKT && pti->pt_send) { 3801541Srgrimes error = ureadc((int)pti->pt_send, uio); 3811541Srgrimes if (error) 3821541Srgrimes return (error); 3831541Srgrimes if (pti->pt_send & TIOCPKT_IOCTL) { 3841541Srgrimes cc = min(uio->uio_resid, 3851541Srgrimes sizeof(tp->t_termios)); 3862807Sbde uiomove((caddr_t)&tp->t_termios, cc, 3872807Sbde uio); 3881541Srgrimes } 3891541Srgrimes pti->pt_send = 0; 3901541Srgrimes return (0); 3911541Srgrimes } 3921541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 3931541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 3941541Srgrimes if (error) 3951541Srgrimes return (error); 3961541Srgrimes pti->pt_ucntl = 0; 3971541Srgrimes return (0); 3981541Srgrimes } 3991541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4001541Srgrimes break; 4011541Srgrimes } 4029824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4031541Srgrimes return (0); /* EOF */ 4041541Srgrimes if (flag & IO_NDELAY) 4051541Srgrimes return (EWOULDBLOCK); 4069639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4073308Sphk if (error) 4081541Srgrimes return (error); 4091541Srgrimes } 4101541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4111541Srgrimes error = ureadc(0, uio); 4121541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4131541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4141541Srgrimes if (cc <= 0) 4151541Srgrimes break; 4161541Srgrimes error = uiomove(buf, cc, uio); 4171541Srgrimes } 4189626Sbde ttwwakeup(tp); 4191541Srgrimes return (error); 4201541Srgrimes} 4211541Srgrimes 42212675Sjulianstatic void 4231541Srgrimesptsstop(tp, flush) 4241541Srgrimes register struct tty *tp; 4251541Srgrimes int flush; 4261541Srgrimes{ 4271541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)]; 4281541Srgrimes int flag; 4291541Srgrimes 4301541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4311541Srgrimes if (flush == 0) { 4321541Srgrimes flush = TIOCPKT_STOP; 4331541Srgrimes pti->pt_flags |= PF_STOPPED; 4341541Srgrimes } else 4351541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4361541Srgrimes pti->pt_send |= flush; 4371541Srgrimes /* change of perspective */ 4381541Srgrimes flag = 0; 4391541Srgrimes if (flush & FREAD) 4401541Srgrimes flag |= FWRITE; 4411541Srgrimes if (flush & FWRITE) 4421541Srgrimes flag |= FREAD; 4431541Srgrimes ptcwakeup(tp, flag); 4441541Srgrimes} 4451541Srgrimes 44612675Sjulianstatic int 4471541Srgrimesptcselect(dev, rw, p) 4481541Srgrimes dev_t dev; 4491541Srgrimes int rw; 4501541Srgrimes struct proc *p; 4511541Srgrimes{ 4521541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 4531541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 4541541Srgrimes int s; 4551541Srgrimes 4569824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4571541Srgrimes return (1); 4581541Srgrimes switch (rw) { 4591541Srgrimes 4601541Srgrimes case FREAD: 4611541Srgrimes /* 4621541Srgrimes * Need to block timeouts (ttrstart). 4631541Srgrimes */ 4641541Srgrimes s = spltty(); 4651541Srgrimes if ((tp->t_state&TS_ISOPEN) && 4661541Srgrimes tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) { 4671541Srgrimes splx(s); 4681541Srgrimes return (1); 4691541Srgrimes } 4701541Srgrimes splx(s); 4711541Srgrimes /* FALLTHROUGH */ 4721541Srgrimes 4731541Srgrimes case 0: /* exceptional */ 4741541Srgrimes if ((tp->t_state&TS_ISOPEN) && 4753308Sphk ((pti->pt_flags&PF_PKT && pti->pt_send) || 4763308Sphk (pti->pt_flags&PF_UCNTL && pti->pt_ucntl))) 4771541Srgrimes return (1); 4781541Srgrimes selrecord(p, &pti->pt_selr); 4791541Srgrimes break; 4801541Srgrimes 4811541Srgrimes 4821541Srgrimes case FWRITE: 4831541Srgrimes if (tp->t_state&TS_ISOPEN) { 4841541Srgrimes if (pti->pt_flags & PF_REMOTE) { 4851541Srgrimes if (tp->t_canq.c_cc == 0) 4861541Srgrimes return (1); 4871541Srgrimes } else { 4881541Srgrimes if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) 4891541Srgrimes return (1); 4901541Srgrimes if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON)) 4911541Srgrimes return (1); 4921541Srgrimes } 4931541Srgrimes } 4941541Srgrimes selrecord(p, &pti->pt_selw); 4951541Srgrimes break; 4961541Srgrimes 4971541Srgrimes } 4981541Srgrimes return (0); 4991541Srgrimes} 5001541Srgrimes 50112675Sjulianstatic int 5021541Srgrimesptcwrite(dev, uio, flag) 5031541Srgrimes dev_t dev; 5041541Srgrimes register struct uio *uio; 5051541Srgrimes int flag; 5061541Srgrimes{ 5071541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 5081549Srgrimes register u_char *cp = 0; 5091541Srgrimes register int cc = 0; 5101541Srgrimes u_char locbuf[BUFSIZ]; 5111541Srgrimes int cnt = 0; 5121541Srgrimes struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 5131541Srgrimes int error = 0; 5141541Srgrimes 5151541Srgrimesagain: 5161541Srgrimes if ((tp->t_state&TS_ISOPEN) == 0) 5171541Srgrimes goto block; 5181541Srgrimes if (pti->pt_flags & PF_REMOTE) { 5191541Srgrimes if (tp->t_canq.c_cc) 5201541Srgrimes goto block; 52111789Sbde while ((uio->uio_resid > 0 || cc > 0) && 52211789Sbde tp->t_canq.c_cc < TTYHOG - 1) { 5231541Srgrimes if (cc == 0) { 5241541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5251541Srgrimes cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); 5261541Srgrimes cp = locbuf; 5271541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5281541Srgrimes if (error) 5291541Srgrimes return (error); 5301541Srgrimes /* check again for safety */ 53111789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 53211789Sbde /* adjust as usual */ 53311789Sbde uio->uio_resid += cc; 5341541Srgrimes return (EIO); 53511789Sbde } 5361541Srgrimes } 5371541Srgrimes if (cc) 53811789Sbde cc -= b_to_q((char *)cp, cc, &tp->t_canq); 5391541Srgrimes } 54011789Sbde /* adjust for data copied in but not written */ 54111789Sbde uio->uio_resid += cc; 5421541Srgrimes (void) putc(0, &tp->t_canq); 5431541Srgrimes ttwakeup(tp); 5449639Sbde wakeup(TSA_PTS_READ(tp)); 5451541Srgrimes return (0); 5461541Srgrimes } 54711789Sbde while (uio->uio_resid > 0 || cc > 0) { 5481541Srgrimes if (cc == 0) { 5491541Srgrimes cc = min(uio->uio_resid, BUFSIZ); 5501541Srgrimes cp = locbuf; 5511541Srgrimes error = uiomove((caddr_t)cp, cc, uio); 5521541Srgrimes if (error) 5531541Srgrimes return (error); 5541541Srgrimes /* check again for safety */ 55511789Sbde if ((tp->t_state & TS_ISOPEN) == 0) { 55611789Sbde /* adjust for data copied in but not written */ 55711789Sbde uio->uio_resid += cc; 5581541Srgrimes return (EIO); 55911789Sbde } 5601541Srgrimes } 5611541Srgrimes while (cc > 0) { 5621541Srgrimes if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && 5631541Srgrimes (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) { 5649824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 5651541Srgrimes goto block; 5661541Srgrimes } 5671541Srgrimes (*linesw[tp->t_line].l_rint)(*cp++, tp); 5681541Srgrimes cnt++; 5691541Srgrimes cc--; 5701541Srgrimes } 5711541Srgrimes cc = 0; 5721541Srgrimes } 5731541Srgrimes return (0); 5741541Srgrimesblock: 5751541Srgrimes /* 5761541Srgrimes * Come here to wait for slave to open, for space 5771541Srgrimes * in outq, or space in rawq. 5781541Srgrimes */ 57911789Sbde if ((tp->t_state & TS_CONNECTED) == 0) { 58011789Sbde /* adjust for data copied in but not written */ 58111789Sbde uio->uio_resid += cc; 5821541Srgrimes return (EIO); 58311789Sbde } 5841541Srgrimes if (flag & IO_NDELAY) { 5851541Srgrimes /* adjust for data copied in but not written */ 5861541Srgrimes uio->uio_resid += cc; 5871541Srgrimes if (cnt == 0) 5881541Srgrimes return (EWOULDBLOCK); 5891541Srgrimes return (0); 5901541Srgrimes } 5919639Sbde error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); 5923308Sphk if (error) { 5931541Srgrimes /* adjust for data copied in but not written */ 5941541Srgrimes uio->uio_resid += cc; 5951541Srgrimes return (error); 5961541Srgrimes } 5971541Srgrimes goto again; 5981541Srgrimes} 5991541Srgrimes 60012675Sjulianstatic struct tty * 6016712Spstptydevtotty(dev) 6026712Spst dev_t dev; 6036712Spst{ 6046712Spst if (minor(dev) >= npty) 6056712Spst return (NULL); 6066712Spst 6076712Spst return &pt_tty[minor(dev)]; 6086712Spst} 6096712Spst 6101541Srgrimes/*ARGSUSED*/ 61112675Sjulianstatic int 6121541Srgrimesptyioctl(dev, cmd, data, flag, p) 6131541Srgrimes dev_t dev; 6141541Srgrimes int cmd; 6151541Srgrimes caddr_t data; 6161541Srgrimes int flag; 6171541Srgrimes struct proc *p; 6181541Srgrimes{ 6191541Srgrimes register struct tty *tp = &pt_tty[minor(dev)]; 6201541Srgrimes register struct pt_ioctl *pti = &pt_ioctl[minor(dev)]; 6211541Srgrimes register u_char *cc = tp->t_cc; 6221541Srgrimes int stop, error; 6231541Srgrimes 6241541Srgrimes /* 6251541Srgrimes * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. 6261541Srgrimes * ttywflush(tp) will hang if there are characters in the outq. 6271541Srgrimes */ 6281541Srgrimes if (cmd == TIOCEXT) { 6291541Srgrimes /* 6301541Srgrimes * When the EXTPROC bit is being toggled, we need 6311541Srgrimes * to send an TIOCPKT_IOCTL if the packet driver 6321541Srgrimes * is turned on. 6331541Srgrimes */ 6341541Srgrimes if (*(int *)data) { 6351541Srgrimes if (pti->pt_flags & PF_PKT) { 6361541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 6371541Srgrimes ptcwakeup(tp, FREAD); 6381541Srgrimes } 6391541Srgrimes tp->t_lflag |= EXTPROC; 6401541Srgrimes } else { 64114511Shsu if ((tp->t_lflag & EXTPROC) && 6421541Srgrimes (pti->pt_flags & PF_PKT)) { 6431541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 6441541Srgrimes ptcwakeup(tp, FREAD); 6451541Srgrimes } 6461541Srgrimes tp->t_lflag &= ~EXTPROC; 6471541Srgrimes } 6481541Srgrimes return(0); 6491541Srgrimes } else 65012813Sjulian if (cdevsw[major(dev)]->d_open == ptcopen) 6511541Srgrimes switch (cmd) { 6521541Srgrimes 6531541Srgrimes case TIOCGPGRP: 6541541Srgrimes /* 6551541Srgrimes * We aviod 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); 6861541Srgrimes 6871541Srgrimes#ifdef COMPAT_43 6888876Srgrimes case TIOCSETP: 6891541Srgrimes case TIOCSETN: 6901541Srgrimes#endif 6911541Srgrimes case TIOCSETD: 6921541Srgrimes case TIOCSETA: 6931541Srgrimes case TIOCSETAW: 6949858Sache case TIOCSETAF: 6951541Srgrimes ndflush(&tp->t_outq, tp->t_outq.c_cc); 6961541Srgrimes break; 6971541Srgrimes 6981541Srgrimes case TIOCSIG: 6991541Srgrimes if (*(unsigned int *)data >= NSIG) 7001541Srgrimes return(EINVAL); 7011541Srgrimes if ((tp->t_lflag&NOFLSH) == 0) 7021541Srgrimes ttyflush(tp, FREAD|FWRITE); 7031541Srgrimes pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 7041541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7051541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7061541Srgrimes ttyinfo(tp); 7071541Srgrimes return(0); 7081541Srgrimes } 7091541Srgrimes error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); 7101541Srgrimes if (error < 0) 7111541Srgrimes error = ttioctl(tp, cmd, data, flag); 7121541Srgrimes if (error < 0) { 7131541Srgrimes if (pti->pt_flags & PF_UCNTL && 7141541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7151541Srgrimes if (cmd & 0xff) { 7161541Srgrimes pti->pt_ucntl = (u_char)cmd; 7171541Srgrimes ptcwakeup(tp, FREAD); 7181541Srgrimes } 7191541Srgrimes return (0); 7201541Srgrimes } 7211541Srgrimes error = ENOTTY; 7221541Srgrimes } 7231541Srgrimes /* 7241541Srgrimes * If external processing and packet mode send ioctl packet. 7251541Srgrimes */ 7261541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7271541Srgrimes switch(cmd) { 7281541Srgrimes case TIOCSETA: 7291541Srgrimes case TIOCSETAW: 7301541Srgrimes case TIOCSETAF: 7311541Srgrimes#ifdef COMPAT_43 7321541Srgrimes case TIOCSETP: 7331541Srgrimes case TIOCSETN: 7341541Srgrimes#endif 7351541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7361541Srgrimes case TIOCSETC: 7371541Srgrimes case TIOCSLTC: 7381541Srgrimes case TIOCLBIS: 7391541Srgrimes case TIOCLBIC: 7401541Srgrimes case TIOCLSET: 7411541Srgrimes#endif 7421541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7431541Srgrimes ptcwakeup(tp, FREAD); 7441541Srgrimes default: 7451541Srgrimes break; 7461541Srgrimes } 7471541Srgrimes } 7488876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 7491541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 7501541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 7511541Srgrimes if (stop) { 7521541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 7531541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 7541541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 7551541Srgrimes ptcwakeup(tp, FREAD); 7561541Srgrimes } 7571541Srgrimes } else { 7581541Srgrimes if (!stop) { 7591541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 7601541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 7611541Srgrimes pti->pt_flags |= PF_NOSTOP; 7621541Srgrimes ptcwakeup(tp, FREAD); 7631541Srgrimes } 7641541Srgrimes } 7651541Srgrimes return (error); 7661541Srgrimes} 76712517Sjulian 76812517Sjulianstatic ptc_devsw_installed = 0; 76912675Sjulian#ifdef DEVFS 77012675Sjulian#define MAXUNITS (8 * 32) 77112675Sjulianstatic void *devfs_token_pts[MAXUNITS]; 77212675Sjulianstatic void *devfs_token_ptc[MAXUNITS]; 77312819Sphkstatic const char jnames[] = "pqrsPQRS"; 77412675Sjulian#endif 77512517Sjulian 77612675Sjulianstatic void 77712675Sjulianptc_drvinit(void *unused) 77812517Sjulian{ 77912517Sjulian#ifdef DEVFS 78012567Sjulian int i,j,k; 78112675Sjulian char name[16]; 78212517Sjulian#endif 78312517Sjulian dev_t dev; 78412517Sjulian 78512517Sjulian if( ! ptc_devsw_installed ) { 78612675Sjulian dev = makedev(CDEV_MAJOR_S, 0); 78712675Sjulian cdevsw_add(&dev, &pts_cdevsw, NULL); 78812675Sjulian dev = makedev(CDEV_MAJOR_C, 0); 78912675Sjulian cdevsw_add(&dev, &ptc_cdevsw, NULL); 79012517Sjulian ptc_devsw_installed = 1; 79112517Sjulian#ifdef DEVFS 79212517Sjulian/*XXX*/ 79312517Sjulian#if NPTY > MAXUNITS 79412517Sjulian#undef NPTY 79512517Sjulian#define NPTY MAXUNITS 79612517Sjulian#endif 79712521Sjulian for ( i = 0 ; i<NPTY ; i++ ) { 79812675Sjulian void *x; 79912517Sjulian 80012564Sjulian j = i / 32; 80112564Sjulian k = i % 32; 80212675Sjulian devfs_token_pts[i] = 80313630Sphk devfs_add_devswf(&pts_cdevsw,i, 80413630Sphk DV_CHR,0,0,0666, 80513639Sphk "tty%c%n",jnames[j],k); 80612675Sjulian devfs_token_ptc[i] = 80713630Sphk devfs_add_devswf(&ptc_cdevsw,i, 80813630Sphk DV_CHR,0,0,0666, 80913639Sphk "pty%c%n",jnames[j],k); 81012521Sjulian } 81112521Sjulian#endif 81212517Sjulian } 81312517Sjulian} 81412517Sjulian 81512517SjulianSYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 81612517Sjulian 81712517Sjulian 818