pty.c revision 130077
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 * 4. Neither the name of the University nor the names of its contributors 141541Srgrimes * may be used to endorse or promote products derived from this software 151541Srgrimes * without specific prior written permission. 161541Srgrimes * 171541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271541Srgrimes * SUCH DAMAGE. 281541Srgrimes * 2914511Shsu * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 301541Srgrimes */ 311541Srgrimes 32116182Sobrien#include <sys/cdefs.h> 33116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/tty_pty.c 130077 2004-06-04 16:02:56Z phk $"); 34116182Sobrien 351541Srgrimes/* 361541Srgrimes * Pseudo-teletype Driver 371541Srgrimes * (Actually two drivers, requiring two entries in 'cdevsw') 381541Srgrimes */ 3931778Seivind#include "opt_compat.h" 40111899Sdas#include "opt_tty.h" 411541Srgrimes#include <sys/param.h> 421541Srgrimes#include <sys/systm.h> 4391140Stanimura#include <sys/lock.h> 4491140Stanimura#include <sys/mutex.h> 4591140Stanimura#include <sys/sx.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> 5749536Sphk#include <sys/malloc.h> 581541Srgrimes 5969774Sphkstatic MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); 6012517Sjulian 6192723Salfredstatic void ptsstart(struct tty *tp); 6292723Salfredstatic void ptsstop(struct tty *tp, int rw); 6392723Salfredstatic void ptcwakeup(struct tty *tp, int flag); 6492723Salfredstatic dev_t ptyinit(dev_t cdev); 6511789Sbde 6612675Sjulianstatic d_open_t ptsopen; 6712675Sjulianstatic d_close_t ptsclose; 6812675Sjulianstatic d_read_t ptsread; 6912675Sjulianstatic d_write_t ptswrite; 7012675Sjulianstatic d_ioctl_t ptyioctl; 7112675Sjulianstatic d_open_t ptcopen; 7212675Sjulianstatic d_close_t ptcclose; 7312675Sjulianstatic d_read_t ptcread; 7412675Sjulianstatic d_write_t ptcwrite; 7529354Speterstatic d_poll_t ptcpoll; 7612675Sjulian 7738485Sbde#define CDEV_MAJOR_S 5 7847625Sphkstatic struct cdevsw pts_cdevsw = { 79126080Sphk .d_version = D_VERSION, 80111815Sphk .d_open = ptsopen, 81111815Sphk .d_close = ptsclose, 82111815Sphk .d_read = ptsread, 83111815Sphk .d_write = ptswrite, 84111815Sphk .d_ioctl = ptyioctl, 85111815Sphk .d_name = "pts", 86111815Sphk .d_maj = CDEV_MAJOR_S, 87126080Sphk .d_flags = D_TTY | D_NEEDGIANT, 8838485Sbde}; 8912675Sjulian 9038485Sbde#define CDEV_MAJOR_C 6 9147625Sphkstatic struct cdevsw ptc_cdevsw = { 92126080Sphk .d_version = D_VERSION, 93111815Sphk .d_open = ptcopen, 94111815Sphk .d_close = ptcclose, 95111815Sphk .d_read = ptcread, 96111815Sphk .d_write = ptcwrite, 97111815Sphk .d_ioctl = ptyioctl, 98111815Sphk .d_poll = ptcpoll, 99111815Sphk .d_name = "ptc", 100111815Sphk .d_maj = CDEV_MAJOR_C, 101126080Sphk .d_flags = D_TTY | D_NEEDGIANT, 10238485Sbde}; 10312675Sjulian 1041541Srgrimes#define BUFSIZ 100 /* Chunk size iomoved to/from user */ 1051541Srgrimes 10649536Sphkstruct pt_ioctl { 1071541Srgrimes int pt_flags; 1081541Srgrimes struct selinfo pt_selr, pt_selw; 1091541Srgrimes u_char pt_send; 1101541Srgrimes u_char pt_ucntl; 111130054Sphk struct tty *pt_tty; 11250092Sjulian dev_t devs, devc; 11357070Srwatson struct prison *pt_prison; 11449536Sphk}; 1151541Srgrimes 1161541Srgrimes#define PF_PKT 0x08 /* packet mode */ 1171541Srgrimes#define PF_STOPPED 0x10 /* user told stopped */ 1181541Srgrimes#define PF_REMOTE 0x20 /* remote and flow controlled input */ 1191541Srgrimes#define PF_NOSTOP 0x40 1201541Srgrimes#define PF_UCNTL 0x80 /* user control mode */ 1211541Srgrimes 12277176Sphkstatic char *names = "pqrsPQRS"; 1231541Srgrimes/* 12449536Sphk * This function creates and initializes a pts/ptc pair 1251541Srgrimes * 12649536Sphk * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 12749536Sphk * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] 12849536Sphk * 129111742Sdes * XXX: define and add mapping of upper minor bits to allow more 13049536Sphk * than 256 ptys. 1311541Srgrimes */ 13264880Sphkstatic dev_t 13377176Sphkptyinit(dev_t devc) 1341541Srgrimes{ 13577176Sphk dev_t devs; 13649536Sphk struct pt_ioctl *pt; 13777176Sphk int n; 1381541Srgrimes 13977176Sphk n = minor(devc); 14049536Sphk /* For now we only map the lower 8 bits of the minor */ 14149536Sphk if (n & ~0xff) 14264880Sphk return (NODEV); 14349536Sphk 14478405Sbrian devc->si_flags &= ~SI_CHEAPCLONE; 14578405Sbrian 146111119Simp pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); 14750092Sjulian pt->devs = devs = make_dev(&pts_cdevsw, n, 14866067Sphk UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); 14977176Sphk pt->devc = devc; 15049536Sphk 151130054Sphk pt->pt_tty = ttymalloc(pt->pt_tty); 15249536Sphk devs->si_drv1 = devc->si_drv1 = pt; 153130054Sphk devs->si_tty = devc->si_tty = pt->pt_tty; 154130054Sphk pt->pt_tty->t_dev = devs; 15564880Sphk return (devc); 15616322Sgpalmer} 1571541Srgrimes 1581541Srgrimes/*ARGSUSED*/ 15912675Sjulianstatic int 16083366Sjulianptsopen(dev, flag, devtype, td) 1611541Srgrimes dev_t dev; 1621541Srgrimes int flag, devtype; 16383366Sjulian struct thread *td; 1641541Srgrimes{ 165111742Sdes struct tty *tp; 1661541Srgrimes int error; 16757070Srwatson struct pt_ioctl *pti; 1681541Srgrimes 16949536Sphk if (!dev->si_drv1) 170111742Sdes return(ENXIO); 17157070Srwatson pti = dev->si_drv1; 17250652Sphk tp = dev->si_tty; 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; 180125839Srwatson } else if (tp->t_state & TS_XCLUDE && suser(td)) 1811541Srgrimes return (EBUSY); 182125839Srwatson else if (pti->pt_prison != td->td_ucred->cr_prison) 18357070Srwatson return (EBUSY); 1841541Srgrimes if (tp->t_oproc) /* Ctrlr still around. */ 185130077Sphk (void)ttyld_modem(tp, 1); 1861541Srgrimes while ((tp->t_state & TS_CARR_ON) == 0) { 1871541Srgrimes if (flag&FNONBLOCK) 1881541Srgrimes break; 1899639Sbde error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1909624Sbde "ptsopn", 0); 1913308Sphk if (error) 1921541Srgrimes return (error); 1931541Srgrimes } 194130077Sphk error = ttyld_open(tp, dev); 1957724Sache if (error == 0) 1967724Sache ptcwakeup(tp, FREAD|FWRITE); 1971541Srgrimes return (error); 1981541Srgrimes} 1991541Srgrimes 20012675Sjulianstatic int 20183366Sjulianptsclose(dev, flag, mode, td) 2021541Srgrimes dev_t dev; 2031541Srgrimes int flag, mode; 20483366Sjulian struct thread *td; 2051541Srgrimes{ 206111742Sdes struct tty *tp; 2071541Srgrimes int err; 2081541Srgrimes 20950652Sphk tp = dev->si_tty; 210130077Sphk err = ttyld_close(tp, flag); 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{ 22183366Sjulian struct thread *td = curthread; 22283366Sjulian struct proc *p = td->td_proc; 223111742Sdes struct tty *tp = dev->si_tty; 224111742Sdes struct pt_ioctl *pti = dev->si_drv1; 22594860Sjhb struct pgrp *pg; 2261541Srgrimes int error = 0; 2271541Srgrimes 2281541Srgrimesagain: 2291541Srgrimes if (pti->pt_flags & PF_REMOTE) { 2301541Srgrimes while (isbackground(p, tp)) { 23194860Sjhb sx_slock(&proctree_lock); 23291140Stanimura PROC_LOCK(p); 233114983Sjhb if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || 234112888Sjeff SIGISMEMBER(td->td_sigmask, SIGTTIN) || 23591140Stanimura p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) { 23691140Stanimura PROC_UNLOCK(p); 23794860Sjhb sx_sunlock(&proctree_lock); 2381541Srgrimes return (EIO); 23991140Stanimura } 24094860Sjhb pg = p->p_pgrp; 24191140Stanimura PROC_UNLOCK(p); 24294860Sjhb PGRP_LOCK(pg); 24394860Sjhb sx_sunlock(&proctree_lock); 24494860Sjhb pgsignal(pg, SIGTTIN, 1); 24594860Sjhb PGRP_UNLOCK(pg); 2469624Sbde error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 2479624Sbde 0); 2483308Sphk if (error) 2491541Srgrimes return (error); 2501541Srgrimes } 2511541Srgrimes if (tp->t_canq.c_cc == 0) { 2521541Srgrimes if (flag & IO_NDELAY) 2531541Srgrimes return (EWOULDBLOCK); 2549639Sbde error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, 2559624Sbde "ptsin", 0); 2563308Sphk if (error) 2571541Srgrimes return (error); 2581541Srgrimes goto again; 2591541Srgrimes } 2601541Srgrimes while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) 2611541Srgrimes if (ureadc(getc(&tp->t_canq), uio) < 0) { 2621541Srgrimes error = EFAULT; 2631541Srgrimes break; 2641541Srgrimes } 2651541Srgrimes if (tp->t_canq.c_cc == 1) 2661541Srgrimes (void) getc(&tp->t_canq); 2671541Srgrimes if (tp->t_canq.c_cc) 2681541Srgrimes return (error); 2691541Srgrimes } else 2701541Srgrimes if (tp->t_oproc) 271130077Sphk error = ttyld_read(tp, uio, flag); 2721541Srgrimes ptcwakeup(tp, FWRITE); 2731541Srgrimes return (error); 2741541Srgrimes} 2751541Srgrimes 2761541Srgrimes/* 2771541Srgrimes * Write to pseudo-tty. 2781541Srgrimes * Wakeups of controlling tty will happen 2791541Srgrimes * indirectly, when tty driver calls ptsstart. 2801541Srgrimes */ 28112675Sjulianstatic int 2821541Srgrimesptswrite(dev, uio, flag) 2831541Srgrimes dev_t dev; 2841541Srgrimes struct uio *uio; 2851541Srgrimes int flag; 2861541Srgrimes{ 287111742Sdes struct tty *tp; 2881541Srgrimes 28950652Sphk tp = dev->si_tty; 2901541Srgrimes if (tp->t_oproc == 0) 2911541Srgrimes return (EIO); 292130077Sphk return (ttyld_write(tp, uio, flag)); 2931541Srgrimes} 2941541Srgrimes 2951541Srgrimes/* 2961541Srgrimes * Start output on pseudo-tty. 2971541Srgrimes * Wake up process selecting or sleeping for input from controlling tty. 2981541Srgrimes */ 29912819Sphkstatic void 3001541Srgrimesptsstart(tp) 3011541Srgrimes struct tty *tp; 3021541Srgrimes{ 303111742Sdes struct pt_ioctl *pti = tp->t_dev->si_drv1; 3041541Srgrimes 3051541Srgrimes if (tp->t_state & TS_TTSTOP) 3061541Srgrimes return; 3071541Srgrimes if (pti->pt_flags & PF_STOPPED) { 3081541Srgrimes pti->pt_flags &= ~PF_STOPPED; 3091541Srgrimes pti->pt_send = TIOCPKT_START; 3101541Srgrimes } 3111541Srgrimes ptcwakeup(tp, FREAD); 3121541Srgrimes} 3131541Srgrimes 31412819Sphkstatic void 3151541Srgrimesptcwakeup(tp, flag) 3161541Srgrimes struct tty *tp; 3171541Srgrimes int flag; 3181541Srgrimes{ 31949536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 3201541Srgrimes 3211541Srgrimes if (flag & FREAD) { 322122352Stanimura selwakeuppri(&pti->pt_selr, TTIPRI); 3239639Sbde wakeup(TSA_PTC_READ(tp)); 3241541Srgrimes } 3251541Srgrimes if (flag & FWRITE) { 326122352Stanimura selwakeuppri(&pti->pt_selw, TTOPRI); 3279639Sbde wakeup(TSA_PTC_WRITE(tp)); 3281541Srgrimes } 3291541Srgrimes} 3301541Srgrimes 33112675Sjulianstatic int 33283366Sjulianptcopen(dev, flag, devtype, td) 3331541Srgrimes dev_t dev; 3341541Srgrimes int flag, devtype; 33583366Sjulian struct thread *td; 3361541Srgrimes{ 337111742Sdes struct tty *tp; 3381541Srgrimes struct pt_ioctl *pti; 3391541Srgrimes 34049536Sphk if (!dev->si_drv1) 34177176Sphk ptyinit(dev); 34249536Sphk if (!dev->si_drv1) 343111742Sdes 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; 350130077Sphk (void)ttyld_modem(tp, 1); 3511541Srgrimes tp->t_lflag &= ~EXTPROC; 35249536Sphk pti = dev->si_drv1; 35391406Sjhb pti->pt_prison = td->td_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{ 367111742Sdes struct tty *tp; 3681541Srgrimes 36950652Sphk tp = dev->si_tty; 370130077Sphk (void)ttyld_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{ 396111742Sdes 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)); 416111741Sdes uiomove(&tp->t_termios, cc, uio); 4171541Srgrimes } 4181541Srgrimes pti->pt_send = 0; 4191541Srgrimes return (0); 4201541Srgrimes } 4211541Srgrimes if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { 4221541Srgrimes error = ureadc((int)pti->pt_ucntl, uio); 4231541Srgrimes if (error) 4241541Srgrimes return (error); 4251541Srgrimes pti->pt_ucntl = 0; 4261541Srgrimes return (0); 4271541Srgrimes } 4281541Srgrimes if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) 4291541Srgrimes break; 4301541Srgrimes } 4319824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 4321541Srgrimes return (0); /* EOF */ 4331541Srgrimes if (flag & IO_NDELAY) 4341541Srgrimes return (EWOULDBLOCK); 4359639Sbde error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); 4363308Sphk if (error) 4371541Srgrimes return (error); 4381541Srgrimes } 4391541Srgrimes if (pti->pt_flags & (PF_PKT|PF_UCNTL)) 4401541Srgrimes error = ureadc(0, uio); 4411541Srgrimes while (uio->uio_resid > 0 && error == 0) { 4421541Srgrimes cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); 4431541Srgrimes if (cc <= 0) 4441541Srgrimes break; 4451541Srgrimes error = uiomove(buf, cc, uio); 4461541Srgrimes } 4479626Sbde ttwwakeup(tp); 4481541Srgrimes return (error); 4491541Srgrimes} 4501541Srgrimes 45112675Sjulianstatic void 4521541Srgrimesptsstop(tp, flush) 453111742Sdes struct tty *tp; 4541541Srgrimes int flush; 4551541Srgrimes{ 45649536Sphk struct pt_ioctl *pti = tp->t_dev->si_drv1; 4571541Srgrimes int flag; 4581541Srgrimes 4591541Srgrimes /* note: FLUSHREAD and FLUSHWRITE already ok */ 4601541Srgrimes if (flush == 0) { 4611541Srgrimes flush = TIOCPKT_STOP; 4621541Srgrimes pti->pt_flags |= PF_STOPPED; 4631541Srgrimes } else 4641541Srgrimes pti->pt_flags &= ~PF_STOPPED; 4651541Srgrimes pti->pt_send |= flush; 4661541Srgrimes /* change of perspective */ 4671541Srgrimes flag = 0; 4681541Srgrimes if (flush & FREAD) 4691541Srgrimes flag |= FWRITE; 4701541Srgrimes if (flush & FWRITE) 4711541Srgrimes flag |= FREAD; 4721541Srgrimes ptcwakeup(tp, flag); 4731541Srgrimes} 4741541Srgrimes 47512675Sjulianstatic int 47683366Sjulianptcpoll(dev, events, td) 4771541Srgrimes dev_t dev; 47829354Speter int events; 47983366Sjulian struct thread *td; 4801541Srgrimes{ 481111742Sdes struct tty *tp = dev->si_tty; 48249536Sphk struct pt_ioctl *pti = dev->si_drv1; 48329354Speter int revents = 0; 4841541Srgrimes int s; 4851541Srgrimes 4869824Sbde if ((tp->t_state & TS_CONNECTED) == 0) 487120513Sphk return (events & 488120513Sphk (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)); 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) ? 505111742Sdes (tp->t_canq.c_cc == 0) : 50629354Speter ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || 50790831Sdillon (tp->t_canq.c_cc == 0 && (tp->t_lflag & 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 518111742Sdes 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; 529111742Sdes struct uio *uio; 5301541Srgrimes int flag; 5311541Srgrimes{ 532111742Sdes struct tty *tp = dev->si_tty; 533111742Sdes u_char *cp = 0; 534111742Sdes 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; 552111741Sdes error = uiomove(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; 587111741Sdes error = uiomove(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 && 59990831Sdillon (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { 6009824Sbde wakeup(TSA_HUP_OR_INPUT(tp)); 6011541Srgrimes goto block; 6021541Srgrimes } 603130077Sphk ttyld_rint(tp, *cp++); 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{ 645111742Sdes struct tty *tp = dev->si_tty; 646111742Sdes struct pt_ioctl *pti = dev->si_drv1; 647111742Sdes 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 /* 689111742Sdes * 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); 71891140Stanimura if (tp->t_pgrp != NULL) { 71991140Stanimura PGRP_LOCK(tp->t_pgrp); 72091140Stanimura pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); 72191140Stanimura PGRP_UNLOCK(tp->t_pgrp); 72291140Stanimura } 7231541Srgrimes if ((*(unsigned int *)data == SIGINFO) && 7241541Srgrimes ((tp->t_lflag&NOKERNINFO) == 0)) 7251541Srgrimes ttyinfo(tp); 7261541Srgrimes return(0); 7271541Srgrimes } 72847203Sluoqi } 72947301Sluoqi if (cmd == TIOCEXT) { 73047301Sluoqi /* 73147301Sluoqi * When the EXTPROC bit is being toggled, we need 73247301Sluoqi * to send an TIOCPKT_IOCTL if the packet driver 73347301Sluoqi * is turned on. 73447301Sluoqi */ 73547301Sluoqi if (*(int *)data) { 73647301Sluoqi if (pti->pt_flags & PF_PKT) { 73747301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 73847301Sluoqi ptcwakeup(tp, FREAD); 73947301Sluoqi } 74047301Sluoqi tp->t_lflag |= EXTPROC; 74147301Sluoqi } else { 74247301Sluoqi if ((tp->t_lflag & EXTPROC) && 74347301Sluoqi (pti->pt_flags & PF_PKT)) { 74447301Sluoqi pti->pt_send |= TIOCPKT_IOCTL; 74547301Sluoqi ptcwakeup(tp, FREAD); 74647301Sluoqi } 74747301Sluoqi tp->t_lflag &= ~EXTPROC; 74847301Sluoqi } 74947301Sluoqi return(0); 75047301Sluoqi } 751130054Sphk error = ttyioctl(dev, cmd, data, flag, td); 752130054Sphk if (error == ENOTTY) { 7531541Srgrimes if (pti->pt_flags & PF_UCNTL && 7541541Srgrimes (cmd & ~0xff) == UIOCCMD(0)) { 7551541Srgrimes if (cmd & 0xff) { 7561541Srgrimes pti->pt_ucntl = (u_char)cmd; 7571541Srgrimes ptcwakeup(tp, FREAD); 7581541Srgrimes } 7591541Srgrimes return (0); 7601541Srgrimes } 7611541Srgrimes error = ENOTTY; 7621541Srgrimes } 7631541Srgrimes /* 7641541Srgrimes * If external processing and packet mode send ioctl packet. 7651541Srgrimes */ 7661541Srgrimes if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { 7671541Srgrimes switch(cmd) { 7681541Srgrimes case TIOCSETA: 7691541Srgrimes case TIOCSETAW: 7701541Srgrimes case TIOCSETAF: 7711541Srgrimes#ifdef COMPAT_43 7721541Srgrimes case TIOCSETP: 7731541Srgrimes case TIOCSETN: 7741541Srgrimes#endif 7751541Srgrimes#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 7761541Srgrimes case TIOCSETC: 7771541Srgrimes case TIOCSLTC: 7781541Srgrimes case TIOCLBIS: 7791541Srgrimes case TIOCLBIC: 7801541Srgrimes case TIOCLSET: 7811541Srgrimes#endif 7821541Srgrimes pti->pt_send |= TIOCPKT_IOCTL; 7831541Srgrimes ptcwakeup(tp, FREAD); 784115463Sphk break; 7851541Srgrimes default: 7861541Srgrimes break; 7871541Srgrimes } 7881541Srgrimes } 7898876Srgrimes stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 7901541Srgrimes && CCEQ(cc[VSTART], CTRL('q')); 7911541Srgrimes if (pti->pt_flags & PF_NOSTOP) { 7921541Srgrimes if (stop) { 7931541Srgrimes pti->pt_send &= ~TIOCPKT_NOSTOP; 7941541Srgrimes pti->pt_send |= TIOCPKT_DOSTOP; 7951541Srgrimes pti->pt_flags &= ~PF_NOSTOP; 7961541Srgrimes ptcwakeup(tp, FREAD); 7971541Srgrimes } 7981541Srgrimes } else { 7991541Srgrimes if (!stop) { 8001541Srgrimes pti->pt_send &= ~TIOCPKT_DOSTOP; 8011541Srgrimes pti->pt_send |= TIOCPKT_NOSTOP; 8021541Srgrimes pti->pt_flags |= PF_NOSTOP; 8031541Srgrimes ptcwakeup(tp, FREAD); 8041541Srgrimes } 8051541Srgrimes } 8061541Srgrimes return (error); 8071541Srgrimes} 80812517Sjulian 80912517Sjulian 81092723Salfredstatic void ptc_drvinit(void *unused); 81149536Sphk 81292723Salfredstatic void pty_clone(void *arg, char *name, int namelen, dev_t *dev); 81364880Sphk 81412675Sjulianstatic void 81564880Sphkpty_clone(arg, name, namelen, dev) 81664880Sphk void *arg; 81764880Sphk char *name; 81864880Sphk int namelen; 81964880Sphk dev_t *dev; 82064880Sphk{ 82164880Sphk int u; 82264880Sphk 82364880Sphk if (*dev != NODEV) 82464880Sphk return; 82564880Sphk if (bcmp(name, "pty", 3) != 0) 82664880Sphk return; 82764880Sphk if (name[5] != '\0') 82864880Sphk return; 82964880Sphk switch (name[3]) { 83064880Sphk case 'p': u = 0; break; 83164880Sphk case 'q': u = 32; break; 83264880Sphk case 'r': u = 64; break; 83364880Sphk case 's': u = 96; break; 83464880Sphk case 'P': u = 128; break; 83564880Sphk case 'Q': u = 160; break; 83664880Sphk case 'R': u = 192; break; 83764880Sphk case 'S': u = 224; break; 83864880Sphk default: return; 83964880Sphk } 84064880Sphk if (name[4] >= '0' && name[4] <= '9') 84164880Sphk u += name[4] - '0'; 84264880Sphk else if (name[4] >= 'a' && name[4] <= 'v') 84364880Sphk u += name[4] - 'a' + 10; 84464880Sphk else 84564880Sphk return; 84677176Sphk *dev = make_dev(&ptc_cdevsw, u, 84777176Sphk UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); 84877176Sphk (*dev)->si_flags |= SI_CHEAPCLONE; 84964880Sphk return; 85064880Sphk} 85164880Sphk 85264880Sphkstatic void 85329506Sbdeptc_drvinit(unused) 85429506Sbde void *unused; 85512517Sjulian{ 856108363Sphk 85765374Sphk EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); 85812517Sjulian} 85912517Sjulian 86012517SjulianSYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL) 861