/* * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tty_pty.c 8.4 (Berkeley) 2/20/95 * $FreeBSD: src/sys/kern/tty_pty.c,v 1.74.2.4 2002/02/20 19:58:13 dillon Exp $ * $DragonFly: src/sys/kern/tty_pty.c,v 1.21 2008/08/13 10:29:38 swildner Exp $ */ /* * Pseudo-teletype Driver * (Actually two drivers, requiring two dev_ops structures) */ #include "use_pty.h" /* XXX */ #include "opt_compat.h" #include #include #if defined(COMPAT_43) || defined(COMPAT_SUNOS) #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define UNIX98_PTYS 1 MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); static void ptsstart (struct tty *tp); static void ptsstop (struct tty *tp, int rw); static void ptcwakeup (struct tty *tp, int flag); static void ptyinit (int n); static d_open_t ptsopen; static d_close_t ptsclose; static d_read_t ptsread; static d_write_t ptswrite; static d_ioctl_t ptyioctl; static d_open_t ptcopen; static d_close_t ptcclose; static d_read_t ptcread; static d_write_t ptcwrite; static d_poll_t ptcpoll; #ifdef UNIX98_PTYS DEVFS_DECLARE_CLONE_BITMAP(pty); static d_clone_t ptyclone; static int pty_debug_level = 0; static struct dev_ops pts98_ops = { { "pts98", 0, D_TTY | D_KQFILTER }, .d_open = ptsopen, .d_close = ptsclose, .d_read = ptsread, .d_write = ptswrite, .d_ioctl = ptyioctl, .d_poll = ttypoll, .d_kqfilter = ttykqfilter, .d_revoke = ttyrevoke }; static struct dev_ops ptc98_ops = { { "ptc98", 0, D_TTY | D_KQFILTER | D_MASTER }, .d_open = ptcopen, .d_close = ptcclose, .d_read = ptcread, .d_write = ptcwrite, .d_ioctl = ptyioctl, .d_poll = ptcpoll, .d_kqfilter = ttykqfilter, .d_revoke = ttyrevoke }; #endif #define CDEV_MAJOR_S 5 static struct dev_ops pts_ops = { { "pts", CDEV_MAJOR_S, D_TTY | D_KQFILTER }, .d_open = ptsopen, .d_close = ptsclose, .d_read = ptsread, .d_write = ptswrite, .d_ioctl = ptyioctl, .d_poll = ttypoll, .d_kqfilter = ttykqfilter, .d_revoke = ttyrevoke }; #define CDEV_MAJOR_C 6 static struct dev_ops ptc_ops = { { "ptc", CDEV_MAJOR_C, D_TTY | D_KQFILTER | D_MASTER }, .d_open = ptcopen, .d_close = ptcclose, .d_read = ptcread, .d_write = ptcwrite, .d_ioctl = ptyioctl, .d_poll = ptcpoll, .d_kqfilter = ttykqfilter, .d_revoke = ttyrevoke }; #define BUFSIZ 100 /* Chunk size iomoved to/from user */ struct pt_ioctl { int pt_flags; int pt_flags2; struct selinfo pt_selr, pt_selw; u_char pt_send; u_char pt_ucntl; struct tty pt_tty; cdev_t devs, devc; struct prison *pt_prison; }; #define PF_PKT 0x08 /* packet mode */ #define PF_STOPPED 0x10 /* user told stopped */ #define PF_REMOTE 0x20 /* remote and flow controlled input */ #define PF_NOSTOP 0x40 #define PF_UCNTL 0x80 /* user control mode */ #define PF_UNIX98 0x01 #define PF_SOPEN 0x02 #define PF_MOPEN 0x04 static int ptydebug(int level, char *fmt, ...) { __va_list ap; __va_start(ap, fmt); if (level <= pty_debug_level) kvprintf(fmt, ap); __va_end(ap); return 0; } /* * This function creates and initializes a pts/ptc pair * * pts == /dev/tty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] * ptc == /dev/pty[pqrsPQRS][0123456789abcdefghijklmnopqrstuv] * * XXX: define and add mapping of upper minor bits to allow more * than 256 ptys. */ static void ptyinit(int n) { cdev_t devs, devc; char *names = "pqrsPQRS"; struct pt_ioctl *pt; /* For now we only map the lower 8 bits of the minor */ if (n & ~0xff) return; pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); pt->devs = devs = make_dev(&pts_ops, n, 0, 0, 0666, "tty%c%r", names[n / 32], n % 32); pt->devc = devc = make_dev(&ptc_ops, n, 0, 0, 0666, "pty%c%r", names[n / 32], n % 32); devs->si_drv1 = devc->si_drv1 = pt; devs->si_tty = devc->si_tty = &pt->pt_tty; devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ pt->pt_tty.t_dev = devs; ttyregister(&pt->pt_tty); } #ifdef UNIX98_PTYS static int ptyclone(struct dev_clone_args *ap) { int unit; struct pt_ioctl *pt; /* * Limit the number of unix98 pty (slave) devices to 1000, as * the utmp(5) format only allows for 8 bytes for the tty, * "pts/XXX". * If this limit is reached, we don't clone and return error * to devfs. */ unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(pty), 1000); if (unit < 0) { ap->a_dev = NULL; return 1; } pt = kmalloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); pt->devc = ap->a_dev = make_only_dev(&ptc98_ops, unit, ap->a_cred->cr_ruid, 0, 0600, "ptm/%d", unit); pt->devs = make_dev(&pts98_ops, unit, ap->a_cred->cr_ruid, GID_TTY, 0620, "pts/%d", unit); pt->devs->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ pt->devc->si_flags |= SI_OVERRIDE; /* uid, gid, perms from dev */ pt->devs->si_drv1 = pt->devc->si_drv1 = pt; pt->devs->si_tty = pt->devc->si_tty = &pt->pt_tty; pt->pt_tty.t_dev = pt->devs; pt->pt_flags2 |= PF_UNIX98; ttyregister(&pt->pt_tty); return 0; } #endif /*ARGSUSED*/ static int ptsopen(struct dev_open_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp; int error; struct pt_ioctl *pti; if (!dev->si_drv1) ptyinit(minor(dev)); if (!dev->si_drv1) return(ENXIO); pti = dev->si_drv1; tp = dev->si_tty; if ((tp->t_state & TS_ISOPEN) == 0) { ttychars(tp); /* Set up default chars */ tp->t_iflag = TTYDEF_IFLAG; tp->t_oflag = TTYDEF_OFLAG; tp->t_lflag = TTYDEF_LFLAG; tp->t_cflag = TTYDEF_CFLAG; tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; } else if ((tp->t_state & TS_XCLUDE) && priv_check_cred(ap->a_cred, PRIV_ROOT, 0)) { return (EBUSY); } else if (pti->pt_prison != ap->a_cred->cr_prison) { return (EBUSY); } if (tp->t_oproc) /* Ctrlr still around. */ (void)(*linesw[tp->t_line].l_modem)(tp, 1); while ((tp->t_state & TS_CARR_ON) == 0) { if (ap->a_oflags & FNONBLOCK) break; error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ptsopn", 0); if (error) return (error); } error = (*linesw[tp->t_line].l_open)(dev, tp); if (error == 0) ptcwakeup(tp, FREAD|FWRITE); #ifdef UNIX98_PTYS /* * Unix98 pty stuff. * On open of the slave, we set the corresponding flag in the common * struct. */ ptydebug(1, "ptsopen=%s | unix98? %s\n", dev->si_name, (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); if ((!error) && (pti->pt_flags2 & PF_UNIX98)) { pti->pt_flags2 |= PF_SOPEN; } #endif return (error); } static int ptsclose(struct dev_close_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp; struct pt_ioctl *pti = dev->si_drv1; int err; tp = dev->si_tty; err = (*linesw[tp->t_line].l_close)(tp, ap->a_fflag); ptsstop(tp, FREAD|FWRITE); (void) ttyclose(tp); #ifdef UNIX98_PTYS /* * Unix98 pty stuff. * On close of the slave, we unset the corresponding flag, and if the master * isn't open anymore, we destroy the slave and unset the unit. */ ptydebug(1, "ptsclose=%s | unix98? %s\n", dev->si_name, (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); if (pti->pt_flags2 & PF_UNIX98) { pti->pt_flags2 &= ~PF_SOPEN; KKASSERT((pti->pt_flags2 & PF_SOPEN) == 0); ptydebug(1, "master open? %s\n", (pti->pt_flags2 & PF_MOPEN)?"yes":"no"); if (!(pti->pt_flags2 & PF_SOPEN) && !(pti->pt_flags2 & PF_MOPEN)) { devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor); destroy_dev(dev); } } #endif return (err); } static int ptsread(struct dev_read_args *ap) { cdev_t dev = ap->a_head.a_dev; struct proc *p = curproc; struct tty *tp = dev->si_tty; struct pt_ioctl *pti = dev->si_drv1; struct lwp *lp; int error = 0; lp = curthread->td_lwp; again: if (pti->pt_flags & PF_REMOTE) { while (isbackground(p, tp)) { if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) || p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) return (EIO); pgsignal(p->p_pgrp, SIGTTIN, 1); error = ttysleep(tp, &lbolt, PCATCH, "ptsbg", 0); if (error) return (error); } if (tp->t_canq.c_cc == 0) { if (ap->a_ioflag & IO_NDELAY) return (EWOULDBLOCK); error = ttysleep(tp, TSA_PTS_READ(tp), PCATCH, "ptsin", 0); if (error) return (error); goto again; } while (tp->t_canq.c_cc > 1 && ap->a_uio->uio_resid > 0) if (ureadc(clist_getc(&tp->t_canq), ap->a_uio) < 0) { error = EFAULT; break; } if (tp->t_canq.c_cc == 1) clist_getc(&tp->t_canq); if (tp->t_canq.c_cc) return (error); } else if (tp->t_oproc) error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag); ptcwakeup(tp, FWRITE); return (error); } /* * Write to pseudo-tty. * Wakeups of controlling tty will happen * indirectly, when tty driver calls ptsstart. */ static int ptswrite(struct dev_write_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp; tp = dev->si_tty; if (tp->t_oproc == 0) return (EIO); return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag)); } /* * Start output on pseudo-tty. * Wake up process selecting or sleeping for input from controlling tty. */ static void ptsstart(struct tty *tp) { struct pt_ioctl *pti = tp->t_dev->si_drv1; if (tp->t_state & TS_TTSTOP) return; if (pti->pt_flags & PF_STOPPED) { pti->pt_flags &= ~PF_STOPPED; pti->pt_send = TIOCPKT_START; } ptcwakeup(tp, FREAD); } static void ptcwakeup(struct tty *tp, int flag) { struct pt_ioctl *pti = tp->t_dev->si_drv1; if (flag & FREAD) { selwakeup(&pti->pt_selr); wakeup(TSA_PTC_READ(tp)); } if (flag & FWRITE) { selwakeup(&pti->pt_selw); wakeup(TSA_PTC_WRITE(tp)); } } static int ptcopen(struct dev_open_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp; struct pt_ioctl *pti; if (!dev->si_drv1) ptyinit(minor(dev)); if (!dev->si_drv1) return(ENXIO); pti = dev->si_drv1; if (pti->pt_prison && pti->pt_prison != ap->a_cred->cr_prison) return(EBUSY); tp = dev->si_tty; if (tp->t_oproc) return (EIO); tp->t_oproc = ptsstart; tp->t_stop = ptsstop; (void)(*linesw[tp->t_line].l_modem)(tp, 1); tp->t_lflag &= ~EXTPROC; pti->pt_prison = ap->a_cred->cr_prison; pti->pt_flags = 0; pti->pt_send = 0; pti->pt_ucntl = 0; pti->devs->si_uid = ap->a_cred->cr_uid; pti->devs->si_gid = 0; pti->devs->si_perms = 0600; pti->devc->si_uid = ap->a_cred->cr_uid; pti->devc->si_gid = 0; pti->devc->si_perms = 0600; #ifdef UNIX98_PTYS /* * Unix98 pty stuff. * On open of the master, we set the corresponding flag in the common * struct. */ ptydebug(1, "ptcopen=%s (master) | unix98? %s\n", dev->si_name, (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); if (pti->pt_flags2 & PF_UNIX98) { pti->pt_flags2 |= PF_MOPEN; } #endif return (0); } static int ptcclose(struct dev_close_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp; struct pt_ioctl *pti = dev->si_drv1; tp = dev->si_tty; (void)(*linesw[tp->t_line].l_modem)(tp, 0); #ifdef UNIX98_PTYS /* * Unix98 pty stuff. * On close of the master, we unset the corresponding flag in the common * struct asap. */ pti->pt_flags2 &= ~PF_MOPEN; #endif /* * XXX MDMBUF makes no sense for ptys but would inhibit the above * l_modem(). CLOCAL makes sense but isn't supported. Special * l_modem()s that ignore carrier drop make no sense for ptys but * may be in use because other parts of the line discipline make * sense for ptys. Recover by doing everything that a normal * ttymodem() would have done except for sending a SIGHUP. */ if (tp->t_state & TS_ISOPEN) { tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED); tp->t_state |= TS_ZOMBIE; ttyflush(tp, FREAD | FWRITE); } tp->t_oproc = 0; /* mark closed */ pti = dev->si_drv1; pti->pt_prison = NULL; pti->devs->si_uid = 0; pti->devs->si_gid = 0; pti->devs->si_perms = 0666; pti->devc->si_uid = 0; pti->devc->si_gid = 0; pti->devc->si_perms = 0666; #ifdef UNIX98_PTYS /* * Unix98 pty stuff. * On close of the master, we destroy the master and, if no slaves are open, * we destroy the slave device and unset the unit. */ ptydebug(1, "ptcclose=%s (master) | unix98? %s\n", dev->si_name, (pti->pt_flags2 & PF_UNIX98)?"yes":"no"); if (pti->pt_flags2 & PF_UNIX98) { KKASSERT((pti->pt_flags2 & PF_MOPEN) == 0); destroy_dev(dev); pti->devc = NULL; if (!(pti->pt_flags2 & PF_SOPEN)) { ptydebug(1, "ptcclose: slaves are not open\n"); destroy_dev(pti->devs); devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(pty), dev->si_uminor); } } #endif return (0); } static int ptcread(struct dev_read_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp = dev->si_tty; struct pt_ioctl *pti = dev->si_drv1; char buf[BUFSIZ]; int error = 0, cc; /* * We want to block until the slave * is open, and there's something to read; * but if we lost the slave or we're NBIO, * then return the appropriate error instead. */ for (;;) { if (tp->t_state&TS_ISOPEN) { if (pti->pt_flags&PF_PKT && pti->pt_send) { error = ureadc((int)pti->pt_send, ap->a_uio); if (error) return (error); if (pti->pt_send & TIOCPKT_IOCTL) { cc = (int)szmin(ap->a_uio->uio_resid, sizeof(tp->t_termios)); uiomove((caddr_t)&tp->t_termios, cc, ap->a_uio); } pti->pt_send = 0; return (0); } if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) { error = ureadc((int)pti->pt_ucntl, ap->a_uio); if (error) return (error); pti->pt_ucntl = 0; return (0); } if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) break; } if ((tp->t_state & TS_CONNECTED) == 0) return (0); /* EOF */ if (ap->a_ioflag & IO_NDELAY) return (EWOULDBLOCK); error = tsleep(TSA_PTC_READ(tp), PCATCH, "ptcin", 0); if (error) return (error); } if (pti->pt_flags & (PF_PKT|PF_UCNTL)) error = ureadc(0, ap->a_uio); while (ap->a_uio->uio_resid > 0 && error == 0) { cc = q_to_b(&tp->t_outq, buf, (int)szmin(ap->a_uio->uio_resid, BUFSIZ)); if (cc <= 0) break; error = uiomove(buf, (size_t)cc, ap->a_uio); } ttwwakeup(tp); return (error); } static void ptsstop(struct tty *tp, int flush) { struct pt_ioctl *pti = tp->t_dev->si_drv1; int flag; /* note: FLUSHREAD and FLUSHWRITE already ok */ if (flush == 0) { flush = TIOCPKT_STOP; pti->pt_flags |= PF_STOPPED; } else pti->pt_flags &= ~PF_STOPPED; pti->pt_send |= flush; /* change of perspective */ flag = 0; if (flush & FREAD) flag |= FWRITE; if (flush & FWRITE) flag |= FREAD; ptcwakeup(tp, flag); } static int ptcpoll(struct dev_poll_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp = dev->si_tty; struct pt_ioctl *pti = dev->si_drv1; int revents = 0; if ((tp->t_state & TS_CONNECTED) == 0) { ap->a_events = seltrue(dev, ap->a_events) | POLLHUP; return(0); } /* * Need to block timeouts (ttrstart). */ crit_enter(); if (ap->a_events & (POLLIN | POLLRDNORM)) if ((tp->t_state & TS_ISOPEN) && ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || ((pti->pt_flags & PF_PKT) && pti->pt_send) || ((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) revents |= ap->a_events & (POLLIN | POLLRDNORM); if (ap->a_events & (POLLOUT | POLLWRNORM)) if (tp->t_state & TS_ISOPEN && ((pti->pt_flags & PF_REMOTE) ? (tp->t_canq.c_cc == 0) : ((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) || (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON))))) revents |= ap->a_events & (POLLOUT | POLLWRNORM); if (ap->a_events & POLLHUP) if ((tp->t_state & TS_CARR_ON) == 0) revents |= POLLHUP; if (revents == 0) { if (ap->a_events & (POLLIN | POLLRDNORM)) selrecord(curthread, &pti->pt_selr); if (ap->a_events & (POLLOUT | POLLWRNORM)) selrecord(curthread, &pti->pt_selw); } crit_exit(); ap->a_events = revents; return (0); } static int ptcwrite(struct dev_write_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp = dev->si_tty; u_char *cp = 0; int cc = 0; u_char locbuf[BUFSIZ]; int cnt = 0; struct pt_ioctl *pti = dev->si_drv1; int error = 0; again: if ((tp->t_state&TS_ISOPEN) == 0) goto block; if (pti->pt_flags & PF_REMOTE) { if (tp->t_canq.c_cc) goto block; while ((ap->a_uio->uio_resid > 0 || cc > 0) && tp->t_canq.c_cc < TTYHOG - 1) { if (cc == 0) { cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ); cc = imin(cc, TTYHOG - 1 - tp->t_canq.c_cc); cp = locbuf; error = uiomove(cp, (size_t)cc, ap->a_uio); if (error) return (error); /* check again for safety */ if ((tp->t_state & TS_ISOPEN) == 0) { /* adjust as usual */ ap->a_uio->uio_resid += cc; return (EIO); } } if (cc > 0) { cc = b_to_q((char *)cp, cc, &tp->t_canq); /* * XXX we don't guarantee that the canq size * is >= TTYHOG, so the above b_to_q() may * leave some bytes uncopied. However, space * is guaranteed for the null terminator if * we don't fail here since (TTYHOG - 1) is * not a multiple of CBSIZE. */ if (cc > 0) break; } } /* adjust for data copied in but not written */ ap->a_uio->uio_resid += cc; clist_putc(0, &tp->t_canq); ttwakeup(tp); wakeup(TSA_PTS_READ(tp)); return (0); } while (ap->a_uio->uio_resid > 0 || cc > 0) { if (cc == 0) { cc = (int)szmin(ap->a_uio->uio_resid, BUFSIZ); cp = locbuf; error = uiomove(cp, (size_t)cc, ap->a_uio); if (error) return (error); /* check again for safety */ if ((tp->t_state & TS_ISOPEN) == 0) { /* adjust for data copied in but not written */ ap->a_uio->uio_resid += cc; return (EIO); } } while (cc > 0) { if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 && (tp->t_canq.c_cc > 0 || !(tp->t_lflag&ICANON))) { wakeup(TSA_HUP_OR_INPUT(tp)); goto block; } (*linesw[tp->t_line].l_rint)(*cp++, tp); cnt++; cc--; } cc = 0; } return (0); block: /* * Come here to wait for slave to open, for space * in outq, or space in rawq, or an empty canq. */ if ((tp->t_state & TS_CONNECTED) == 0) { /* adjust for data copied in but not written */ ap->a_uio->uio_resid += cc; return (EIO); } if (ap->a_ioflag & IO_NDELAY) { /* adjust for data copied in but not written */ ap->a_uio->uio_resid += cc; if (cnt == 0) return (EWOULDBLOCK); return (0); } error = tsleep(TSA_PTC_WRITE(tp), PCATCH, "ptcout", 0); if (error) { /* adjust for data copied in but not written */ ap->a_uio->uio_resid += cc; return (error); } goto again; } /*ARGSUSED*/ static int ptyioctl(struct dev_ioctl_args *ap) { cdev_t dev = ap->a_head.a_dev; struct tty *tp = dev->si_tty; struct pt_ioctl *pti = dev->si_drv1; u_char *cc = tp->t_cc; int stop, error; if (dev_dflags(dev) & D_MASTER) { switch (ap->a_cmd) { case TIOCGPGRP: /* * We avoid calling ttioctl on the controller since, * in that case, tp must be the controlling terminal. */ *(int *)ap->a_data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; return (0); case TIOCPKT: if (*(int *)ap->a_data) { if (pti->pt_flags & PF_UCNTL) return (EINVAL); pti->pt_flags |= PF_PKT; } else pti->pt_flags &= ~PF_PKT; return (0); case TIOCUCNTL: if (*(int *)ap->a_data) { if (pti->pt_flags & PF_PKT) return (EINVAL); pti->pt_flags |= PF_UCNTL; } else pti->pt_flags &= ~PF_UCNTL; return (0); case TIOCREMOTE: if (*(int *)ap->a_data) pti->pt_flags |= PF_REMOTE; else pti->pt_flags &= ~PF_REMOTE; ttyflush(tp, FREAD|FWRITE); return (0); case TIOCISPTMASTER: if ((pti->pt_flags2 & PF_UNIX98) && (pti->devc == dev)) return (0); else return (EINVAL); } /* * The rest of the ioctls shouldn't be called until * the slave is open. */ if ((tp->t_state & TS_ISOPEN) == 0) return (EAGAIN); switch (ap->a_cmd) { #ifdef COMPAT_43 case TIOCSETP: case TIOCSETN: #endif case TIOCSETD: case TIOCSETA: case TIOCSETAW: case TIOCSETAF: /* * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG. * ttywflush(tp) will hang if there are characters in * the outq. */ ndflush(&tp->t_outq, tp->t_outq.c_cc); break; case TIOCSIG: if (*(unsigned int *)ap->a_data >= NSIG || *(unsigned int *)ap->a_data == 0) return(EINVAL); if ((tp->t_lflag&NOFLSH) == 0) ttyflush(tp, FREAD|FWRITE); pgsignal(tp->t_pgrp, *(unsigned int *)ap->a_data, 1); if ((*(unsigned int *)ap->a_data == SIGINFO) && ((tp->t_lflag&NOKERNINFO) == 0)) ttyinfo(tp); return(0); } } if (ap->a_cmd == TIOCEXT) { /* * When the EXTPROC bit is being toggled, we need * to send an TIOCPKT_IOCTL if the packet driver * is turned on. */ if (*(int *)ap->a_data) { if (pti->pt_flags & PF_PKT) { pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } tp->t_lflag |= EXTPROC; } else { if ((tp->t_lflag & EXTPROC) && (pti->pt_flags & PF_PKT)) { pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } tp->t_lflag &= ~EXTPROC; } return(0); } error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data, ap->a_fflag, ap->a_cred); if (error == ENOIOCTL) error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag); if (error == ENOIOCTL) { if (pti->pt_flags & PF_UCNTL && (ap->a_cmd & ~0xff) == UIOCCMD(0)) { if (ap->a_cmd & 0xff) { pti->pt_ucntl = (u_char)ap->a_cmd; ptcwakeup(tp, FREAD); } return (0); } error = ENOTTY; } /* * If external processing and packet mode send ioctl packet. */ if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) { switch(ap->a_cmd) { case TIOCSETA: case TIOCSETAW: case TIOCSETAF: #ifdef COMPAT_43 case TIOCSETP: case TIOCSETN: #endif #if defined(COMPAT_43) || defined(COMPAT_SUNOS) case TIOCSETC: case TIOCSLTC: case TIOCLBIS: case TIOCLBIC: case TIOCLSET: #endif pti->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); default: break; } } stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) && CCEQ(cc[VSTART], CTRL('q')); if (pti->pt_flags & PF_NOSTOP) { if (stop) { pti->pt_send &= ~TIOCPKT_NOSTOP; pti->pt_send |= TIOCPKT_DOSTOP; pti->pt_flags &= ~PF_NOSTOP; ptcwakeup(tp, FREAD); } } else { if (!stop) { pti->pt_send &= ~TIOCPKT_DOSTOP; pti->pt_send |= TIOCPKT_NOSTOP; pti->pt_flags |= PF_NOSTOP; ptcwakeup(tp, FREAD); } } return (error); } static void ptc_drvinit (void *unused); #ifdef UNIX98_PTYS SYSCTL_INT(_kern, OID_AUTO, pty_debug, CTLFLAG_RW, &pty_debug_level, 0, "Change pty debug level"); #endif static void ptc_drvinit(void *unused) { int i; #ifdef UNIX98_PTYS /* * Unix98 pty stuff. * Create the clonable base device. */ make_autoclone_dev(&ptc_ops, &DEVFS_CLONE_BITMAP(pty), ptyclone, 0, 0, 0666, "ptmx"); #endif for (i = 0; i < 256; i++) { ptyinit(i); } } SYSINIT(ptcdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR_C,ptc_drvinit,NULL)