/* * Copyright (c) 2003 Networks Associates Technology, Inc. * All rights reserved. * * This software was developed for the FreeBSD Project in part by Network * Associates Laboratories, the Security Research Division of Network * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), * as part of the DARPA CHATS research program. * * 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 */ #include __FBSDID("$FreeBSD$"); /* * Pseudo-teletype Driver * (Actually two drivers, requiring two entries in 'cdevsw') */ #include "opt_compat.h" #include "opt_tty.h" #include #include #include #include #include #if defined(COMPAT_43) || defined(COMPAT_SUNOS) #include #endif #include #include #include #include #include #include #include #include #include #include static 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 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; static struct cdevsw pts_cdevsw = { .d_version = D_VERSION, .d_open = ptsopen, .d_close = ptsclose, .d_read = ptsread, .d_write = ptswrite, .d_ioctl = ptyioctl, .d_poll = ttypoll, .d_name = "pts", .d_flags = D_TTY, .d_kqfilter = ttykqfilter, }; static struct cdevsw ptc_cdevsw = { .d_version = D_VERSION, .d_open = ptcopen, .d_close = ptcclose, .d_read = ptcread, .d_write = ptcwrite, .d_ioctl = ptyioctl, .d_poll = ptcpoll, .d_name = "ptc", .d_flags = D_TTY, .d_kqfilter = ttykqfilter, }; #define BUFSIZ 100 /* Chunk size iomoved to/from user */ #define TSA_PTC_READ(tp) ((void *)&(tp)->t_outq.c_cf) #define TSA_PTC_WRITE(tp) ((void *)&(tp)->t_rawq.c_cl) #define TSA_PTS_READ(tp) ((void *)&(tp)->t_canq) /*- * Once a tty is allocated, it cannot (currently) be freed. As such, * we keep a global list of ptys that have been used so we can recycle * them. At pt_inuse flag indicates whether or not a pty descriptor * is currently allocated, permitting reuse. pt_flags holds state * associated with a particular session, so isn't overloaded for this. * When a pty descriptor is unused, its number is set to -1 giving * more consistent and traditional allocation orders to pty numbers. * * Locking: (p) indicates that the field is locked by the global pt_mtx. * (c) indicates the value is constant after allocation. Other fields * await tty locking generally, and are protected by Giant. */ struct pt_desc { int pt_inuse; /* (p) in use flag */ int pt_num; /* (c) pty number */ LIST_ENTRY(pt_desc) pt_list; /* (p) global pty list */ int pt_flags; struct selinfo pt_selr, pt_selw; u_char pt_send; u_char pt_ucntl; struct tty *pt_tty; struct cdev *pt_devs, *pt_devc; int pt_pts_open, pt_ptc_open; struct prison *pt_prison; }; /* * Maximum # of ptys is limited by the maximum number of minor device * numbers. We maintain a global linked list of in-use ptys so that * we allocate new ttys with unique pty numbers. pt_free is a count * of "free" entries in the list. pt_inuse is the number of currently * "in use" ptys with numbers allocated. All variables are protected * by pt_mtx. */ static struct mtx pt_mtx; static LIST_HEAD(,pt_desc) pt_list; #define PTY_MAX 256 #define PF_PKT 0x008 /* packet mode */ #define PF_STOPPED 0x010 /* user told stopped */ #define PF_REMOTE 0x020 /* remote and flow controlled input */ #define PF_NOSTOP 0x040 #define PF_UCNTL 0x080 /* user control mode */ #define PF_COPEN 0x100 /* control half open */ #define PF_SOPEN 0x200 /* slave half open */ /* * Given a pty descriptor, search for an available pty number, set it up, * and return it. If no pty number is available, return -1 and don't * update pt->pt_num. For locking reasons, the returned pt_desc should * be immediately added to the pty list on return without first dropping * the lock, or a collision may arise. */ static int pty_getnumber(struct pt_desc *pt) { struct pt_desc *pt_test; int i, collision; mtx_assert(&pt_mtx, MA_OWNED); KASSERT(pt->pt_num == -1, ("pty_getnumber: pt_num != -1 at start")); for (i = 0; i < PTY_MAX; i++) { collision = 0; LIST_FOREACH(pt_test, &pt_list, pt_list) { if (pt_test->pt_num == i) { collision = 1; break; } } if (!collision) { pt->pt_num = i; return (i); } } return (-1); } /* * If there's a free pty descriptor in the pty descriptor list, retrieve it. * Otherwise, allocate a new one, initialize it, and hook it up. If there's * not a tty number, reject. */ static struct pt_desc * pty_new(void) { struct pt_desc *pt; mtx_lock(&pt_mtx); LIST_FOREACH(pt, &pt_list, pt_list) { if (!pt->pt_inuse) break; } if (pt == NULL) { mtx_unlock(&pt_mtx); pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); mtx_lock(&pt_mtx); if (pty_getnumber(pt) == -1) { mtx_unlock(&pt_mtx); free(pt, M_PTY); return (NULL); } pt->pt_inuse = 1; LIST_INSERT_HEAD(&pt_list, pt, pt_list); mtx_unlock(&pt_mtx); pt->pt_tty = ttymalloc(pt->pt_tty); } else { pt->pt_inuse = 1; mtx_unlock(&pt_mtx); } return (pt); } /* * Release a pty descriptor back to the pool for reuse. The pty number * remains allocated. */ static void pty_release(struct pt_desc *pt) { KASSERT(pt->pt_ptc_open == 0 && pt->pt_pts_open == 0, ("pty_release: pts/%d freed while open\n", pt->pt_num)); KASSERT(pt->pt_devs == NULL && pt->pt_devc == NULL, ("pty_release: pts/%d freed whith non-null struct cdev\n", pt->pt_num)); mtx_assert(&pt_mtx, MA_OWNED); pt->pt_inuse = 0; } /* * Given a pty descriptor, if both endpoints are closed, release all * resources and destroy the device nodes to flush file system level * state for the tty (owner, avoid races, etc). */ static void pty_maybecleanup(struct pt_desc *pt) { if (pt->pt_ptc_open || pt->pt_pts_open) return; printf("destroying pty %d\n", pt->pt_num); destroy_dev(pt->pt_devs); destroy_dev(pt->pt_devc); pt->pt_devs = pt->pt_devc = NULL; pt->pt_tty->t_dev = NULL; mtx_lock(&pt_mtx); pty_release(pt); mtx_unlock(&pt_mtx); } /*ARGSUSED*/ static int ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td) { struct tty *tp; int error; struct pt_desc *pt; pt = 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 && suser(td)) { return (EBUSY); } else if (pt->pt_prison != td->td_ucred->cr_prison) { return (EBUSY); } if (tp->t_oproc) /* Ctrlr still around. */ ttyld_modem(tp, 1); while ((tp->t_state & TS_CARR_ON) == 0) { if (flag&FNONBLOCK) break; error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, "ptsopn", 0); if (error) return (error); } error = ttyld_open(tp, dev); if (error == 0) { ptcwakeup(tp, FREAD|FWRITE); pt->pt_pts_open++; } return (error); } static int ptsclose(struct cdev *dev, int flag, int mode, struct thread *td) { struct pt_desc *pt = dev->si_drv1; struct tty *tp; int err; tp = dev->si_tty; err = ttyld_close(tp, flag); ptsstop(tp, FREAD|FWRITE); (void) tty_close(tp); pt->pt_pts_open--; pty_maybecleanup(pt); return (err); } static int ptsread(struct cdev *dev, struct uio *uio, int flag) { struct thread *td = curthread; struct proc *p = td->td_proc; struct tty *tp = dev->si_tty; struct pt_desc *pt = dev->si_drv1; struct pgrp *pg; int error = 0; again: if (pt->pt_flags & PF_REMOTE) { while (isbackground(p, tp)) { sx_slock(&proctree_lock); PROC_LOCK(p); if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || SIGISMEMBER(td->td_sigmask, SIGTTIN) || p->p_pgrp->pg_jobc == 0 || p->p_flag & P_PPWAIT) { PROC_UNLOCK(p); sx_sunlock(&proctree_lock); return (EIO); } pg = p->p_pgrp; PROC_UNLOCK(p); PGRP_LOCK(pg); sx_sunlock(&proctree_lock); pgsignal(pg, SIGTTIN, 1); PGRP_UNLOCK(pg); error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ptsbg", 0); if (error) return (error); } if (tp->t_canq.c_cc == 0) { if (flag & IO_NDELAY) return (EWOULDBLOCK); error = ttysleep(tp, TSA_PTS_READ(tp), TTIPRI | PCATCH, "ptsin", 0); if (error) return (error); goto again; } while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0) if (ureadc(getc(&tp->t_canq), uio) < 0) { error = EFAULT; break; } if (tp->t_canq.c_cc == 1) (void) getc(&tp->t_canq); if (tp->t_canq.c_cc) return (error); } else if (tp->t_oproc) ttyld_read(tp, uio, flag); 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 cdev *dev, struct uio *uio, int flag) { struct tty *tp; tp = dev->si_tty; if (tp->t_oproc == 0) return (EIO); return (ttyld_write(tp, uio, flag)); } /* * Start output on pseudo-tty. * Wake up process selecting or sleeping for input from controlling tty. */ static void ptsstart(struct tty *tp) { struct pt_desc *pt = tp->t_dev->si_drv1; if (tp->t_state & TS_TTSTOP) return; if (pt->pt_flags & PF_STOPPED) { pt->pt_flags &= ~PF_STOPPED; pt->pt_send = TIOCPKT_START; } ptcwakeup(tp, FREAD); } static void ptcwakeup(struct tty *tp, int flag) { struct pt_desc *pt = tp->t_dev->si_drv1; if (flag & FREAD) { selwakeup(&pt->pt_selr); wakeup(TSA_PTC_READ(tp)); } if (flag & FWRITE) { selwakeup(&pt->pt_selw); wakeup(TSA_PTC_WRITE(tp)); } } /* * ptcopen implementes exclusive access to the master/control device * as well as creating the slave device based on the credential of the * process opening the master. By creating the slave here, we avoid * a race to access the master in terms of having a process with access * to an incorrectly owned slave, but it does create the possibility * that a racing process can cause a ptmx user to get EIO if it gets * there first. Consumers of ptmx must look for EIO and retry if it * happens. VFS locking may actually prevent this from occurring due * to the lookup into devfs holding the vnode lock through open, but * it's better to be careful. */ static int ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td) { struct pt_desc *pt = dev->si_drv1; struct ucred *cred = td->td_ucred; struct tty *tp; struct cdev *devs; tp = dev->si_tty; if (tp->t_oproc) return (EIO); /* * XXX: Might want to make the ownership/permissions here more * configurable. */ pt->pt_devs = devs = make_dev(&pts_cdevsw, pt->pt_num, cred->cr_ruid, GID_WHEEL, 0620, "pts/%d", pt->pt_num); devs->si_drv1 = pt; devs->si_tty = pt->pt_tty; pt->pt_tty->t_dev = devs; tp->t_timeout = -1; tp->t_oproc = ptsstart; tp->t_stop = ptsstop; ttyld_modem(tp, 1); tp->t_lflag &= ~EXTPROC; pt = dev->si_drv1; pt->pt_prison = td->td_ucred->cr_prison; pt->pt_flags = 0; pt->pt_send = 0; pt->pt_ucntl = 0; pt->pt_ptc_open++; return (0); } static int ptcclose(struct cdev *dev, int flags, int fmt, struct thread *td) { struct pt_desc *pt = dev->si_drv1; struct tty *tp; tp = dev->si_tty; ttyld_modem(tp, 0); /* * 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 */ pt->pt_ptc_open--; pty_maybecleanup(pt); return (0); } static int ptcread(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp = dev->si_tty; struct pt_desc *pt = 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 (pt->pt_flags&PF_PKT && pt->pt_send) { error = ureadc((int)pt->pt_send, uio); if (error) return (error); if (pt->pt_send & TIOCPKT_IOCTL) { cc = min(uio->uio_resid, sizeof(tp->t_termios)); uiomove(&tp->t_termios, cc, uio); } pt->pt_send = 0; return (0); } if (pt->pt_flags&PF_UCNTL && pt->pt_ucntl) { error = ureadc((int)pt->pt_ucntl, uio); if (error) return (error); pt->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 (flag & IO_NDELAY) return (EWOULDBLOCK); error = tsleep(TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0); if (error) return (error); } if (pt->pt_flags & (PF_PKT|PF_UCNTL)) error = ureadc(0, uio); while (uio->uio_resid > 0 && error == 0) { cc = q_to_b(&tp->t_outq, buf, min(uio->uio_resid, BUFSIZ)); if (cc <= 0) break; error = uiomove(buf, cc, uio); } ttwwakeup(tp); return (error); } static void ptsstop(struct tty *tp, int flush) { struct pt_desc *pt = tp->t_dev->si_drv1; int flag; /* note: FLUSHREAD and FLUSHWRITE already ok */ if (flush == 0) { flush = TIOCPKT_STOP; pt->pt_flags |= PF_STOPPED; } else pt->pt_flags &= ~PF_STOPPED; pt->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 cdev *dev, int events, struct thread *td) { struct tty *tp = dev->si_tty; struct pt_desc *pt = dev->si_drv1; int revents = 0; int s; if ((tp->t_state & TS_CONNECTED) == 0) return (events & (POLLHUP | POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)); /* * Need to block timeouts (ttrstart). */ s = spltty(); if (events & (POLLIN | POLLRDNORM)) if ((tp->t_state & TS_ISOPEN) && ((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) || ((pt->pt_flags & PF_PKT) && pt->pt_send) || ((pt->pt_flags & PF_UCNTL) && pt->pt_ucntl))) revents |= events & (POLLIN | POLLRDNORM); if (events & (POLLOUT | POLLWRNORM)) if (tp->t_state & TS_ISOPEN && ((pt->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 |= events & (POLLOUT | POLLWRNORM); if (events & POLLHUP) if ((tp->t_state & TS_CARR_ON) == 0) revents |= POLLHUP; if (revents == 0) { if (events & (POLLIN | POLLRDNORM)) selrecord(td, &pt->pt_selr); if (events & (POLLOUT | POLLWRNORM)) selrecord(td, &pt->pt_selw); } splx(s); return (revents); } static int ptcwrite(struct cdev *dev, struct uio *uio, int flag) { struct tty *tp = dev->si_tty; u_char *cp = 0; int cc = 0; u_char locbuf[BUFSIZ]; int cnt = 0; struct pt_desc *pt = dev->si_drv1; int error = 0; again: if ((tp->t_state&TS_ISOPEN) == 0) goto block; if (pt->pt_flags & PF_REMOTE) { if (tp->t_canq.c_cc) goto block; while ((uio->uio_resid > 0 || cc > 0) && tp->t_canq.c_cc < TTYHOG - 1) { if (cc == 0) { cc = min(uio->uio_resid, BUFSIZ); cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc); cp = locbuf; error = uiomove(cp, cc, uio); if (error) return (error); /* check again for safety */ if ((tp->t_state & TS_ISOPEN) == 0) { /* adjust as usual */ 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 */ uio->uio_resid += cc; (void) putc(0, &tp->t_canq); ttwakeup(tp); wakeup(TSA_PTS_READ(tp)); return (0); } while (uio->uio_resid > 0 || cc > 0) { if (cc == 0) { cc = min(uio->uio_resid, BUFSIZ); cp = locbuf; error = uiomove(cp, cc, uio); if (error) return (error); /* check again for safety */ if ((tp->t_state & TS_ISOPEN) == 0) { /* adjust for data copied in but not written */ 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; } ttyld_rint(tp, *cp++); 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 */ uio->uio_resid += cc; return (EIO); } if (flag & IO_NDELAY) { /* adjust for data copied in but not written */ uio->uio_resid += cc; if (cnt == 0) return (EWOULDBLOCK); return (0); } error = tsleep(TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0); if (error) { /* adjust for data copied in but not written */ uio->uio_resid += cc; return (error); } goto again; } /*ARGSUSED*/ static int ptyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) { struct tty *tp = dev->si_tty; struct pt_desc *pt = dev->si_drv1; u_char *cc = tp->t_cc; int stop, error; if (devsw(dev)->d_open == ptcopen) { switch (cmd) { case TIOCGPGRP: /* * We avoid calling ttioctl on the controller since, * in that case, tp must be the controlling terminal. */ *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0; return (0); case TIOCPKT: if (*(int *)data) { if (pt->pt_flags & PF_UCNTL) return (EINVAL); pt->pt_flags |= PF_PKT; } else pt->pt_flags &= ~PF_PKT; return (0); case TIOCUCNTL: if (*(int *)data) { if (pt->pt_flags & PF_PKT) return (EINVAL); pt->pt_flags |= PF_UCNTL; } else pt->pt_flags &= ~PF_UCNTL; return (0); } /* * The rest of the ioctls shouldn't be called until * the slave is open. */ if ((tp->t_state & TS_ISOPEN) == 0) return (EAGAIN); switch (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 *)data >= NSIG || *(unsigned int *)data == 0) return(EINVAL); if ((tp->t_lflag&NOFLSH) == 0) ttyflush(tp, FREAD|FWRITE); if (tp->t_pgrp != NULL) { PGRP_LOCK(tp->t_pgrp); pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); PGRP_UNLOCK(tp->t_pgrp); } if ((*(unsigned int *)data == SIGINFO) && ((tp->t_lflag&NOKERNINFO) == 0)) ttyinfo(tp); return(0); } } if (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 *)data) { if (pt->pt_flags & PF_PKT) { pt->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } tp->t_lflag |= EXTPROC; } else { if ((tp->t_lflag & EXTPROC) && (pt->pt_flags & PF_PKT)) { pt->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); } tp->t_lflag &= ~EXTPROC; } return(0); } error = ttioctl(tp, cmd, data, flag); if (error == ENOTTY) { if (pt->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) { if (cmd & 0xff) { pt->pt_ucntl = (u_char)cmd; ptcwakeup(tp, FREAD); } return (0); } error = ENOTTY; } /* * If external processing and packet mode send ioctl packet. */ if ((tp->t_lflag&EXTPROC) && (pt->pt_flags & PF_PKT)) { switch(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 pt->pt_send |= TIOCPKT_IOCTL; ptcwakeup(tp, FREAD); break; default: break; } } stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) && CCEQ(cc[VSTART], CTRL('q')); if (pt->pt_flags & PF_NOSTOP) { if (stop) { pt->pt_send &= ~TIOCPKT_NOSTOP; pt->pt_send |= TIOCPKT_DOSTOP; pt->pt_flags &= ~PF_NOSTOP; ptcwakeup(tp, FREAD); } } else { if (!stop) { pt->pt_send &= ~TIOCPKT_DOSTOP; pt->pt_send |= TIOCPKT_NOSTOP; pt->pt_flags |= PF_NOSTOP; ptcwakeup(tp, FREAD); } } return (error); } /* * Match lookups on /dev/ptmx, find the next free pty (if any), set up * the pty descriptor, register it, and return a reference to the master. * * pts == /dev/pts/xxx (oldstyle: ttyp...) * ptc == /dev/pty/xxx (oldstyle: ptyp...) */ static void pty_clone(void *arg, char *name, int namelen, struct cdev **dev) { struct ucred *cred = curthread->td_ucred; /* XXX */ struct pt_desc *pt; struct cdev *devc; if (*dev != NULL) return; if (strcmp(name, "ptmx") != 0) return; pt = pty_new(); if (pt == NULL) return; /* * XXX: Lack of locking here considered worrying. We expose the * pts/pty device nodes before they are fully initialized, although * Giant likely protects us (unless make_dev blocks...?). * * XXX: If a process performs a lookup on /dev/ptmx but never an * open, we won't GC the device node. We should have a callout * sometime later that GC's device instances that were never * opened, or some way to tell devfs that "this had better be for * an open() or we won't create a device". */ pt->pt_devc = devc = make_dev(&ptc_cdevsw, pt->pt_num, UID_ROOT, GID_WHEEL, 0666, "pty%d", pt->pt_num); devc->si_drv1 = pt; devc->si_tty = pt->pt_tty; *dev = devc; printf("pty_clone: allocated pty %d to uid %d\n", pt->pt_num, cred->cr_ruid); return; } static void pty_drvinit(void *unused) { mtx_init(&pt_mtx, "pt_mtx", NULL, MTX_DEF); LIST_INIT(&pt_list); EVENTHANDLER_REGISTER(dev_clone, pty_clone, 0, 1000); } SYSINIT(ptydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,pty_drvinit,NULL)