-
-__private_extern__ int
-ptcread(dev_t dev, struct uio *uio, int flag)
-{
- struct tty *tp = pt_tty[minor(dev)];
- struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
- char buf[BUFSIZ];
- int error = 0, cc;
-
- tty_lock(tp);
-
- /*
- * 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, uio);
- if (error)
- goto out;
- if (pti->pt_send & TIOCPKT_IOCTL) {
- cc = min(uio_resid(uio),
- sizeof(tp->t_termios));
- uiomove((caddr_t)&tp->t_termios, cc,
- uio);
- }
- pti->pt_send = 0;
- goto out;
- }
- if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
- error = ureadc((int)pti->pt_ucntl, uio);
- if (error)
- goto out;
- pti->pt_ucntl = 0;
- goto out;
- }
- if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
- break;
- }
- if ((tp->t_state & TS_CONNECTED) == 0)
- goto out; /* EOF */
- if (flag & IO_NDELAY) {
- error = EWOULDBLOCK;
- goto out;
- }
- error = ttysleep(tp, TSA_PTC_READ(tp), TTIPRI | PCATCH, "ptcin", 0);
- if (error)
- goto out;
- }
- if (pti->pt_flags & (PF_PKT|PF_UCNTL))
- error = ureadc(0, uio);
- while (uio_resid(uio) > 0 && error == 0) {
- cc = q_to_b(&tp->t_outq, (u_char *)buf, min(uio_resid(uio), BUFSIZ));
- if (cc <= 0)
- break;
- error = uiomove(buf, cc, uio);
- }
- (*linesw[tp->t_line].l_start)(tp);
-
-out:
- tty_unlock(tp);
-
- return (error);
-}
-
-/*
- * Line discipline callback
- *
- * Locks: tty_lock() is assumed held on entry and exit.
- */
-__private_extern__ void
-ptsstop(struct tty *tp, int flush)
-{
- struct pt_ioctl *pti;
- int flag;
-
- pti = &pt_ioctl[minor(tp->t_dev)];
-
- /* 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);
-}
-
-__private_extern__ int
-ptcselect(dev_t dev, int rw, void *wql, struct proc *p)
-{
- struct tty *tp = pt_tty[minor(dev)];
- struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
- int retval = 0;
-
- tty_lock(tp);
-
- if ((tp->t_state & TS_CONNECTED) == 0) {
- retval = 1;
- goto out;
- }
- switch (rw) {
-
- case FREAD:
- /*
- * Need to block timeouts (ttrstart).
- */
- if ((tp->t_state&TS_ISOPEN) &&
- tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
- retval = 1;
- goto out;
- }
- /* FALLTHROUGH */
-
- case 0: /* exceptional */
- if ((tp->t_state&TS_ISOPEN) &&
- ((pti->pt_flags&PF_PKT && pti->pt_send) ||
- (pti->pt_flags&PF_UCNTL && pti->pt_ucntl))) {
- retval = 1;
- goto out;
- }
- selrecord(p, &pti->pt_selr, wql);
- break;
-
-
- case FWRITE:
- if (tp->t_state&TS_ISOPEN) {
- if (pti->pt_flags & PF_REMOTE) {
- if (tp->t_canq.c_cc == 0) {
- retval = 1;
- goto out;
- }
- } else {
- if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2) {
- retval = 1;
- goto out;
- }
- if (tp->t_canq.c_cc == 0 && (tp->t_lflag&ICANON)) {
- retval = 1;
- goto out;
- }
- }
- }
- selrecord(p, &pti->pt_selw, wql);
- break;
-
- }
-out:
- tty_unlock(tp);
-
- return (retval);
-}
-
-__private_extern__ int
-ptcwrite(dev_t dev, struct uio *uio, int flag)
-{
- struct tty *tp = pt_tty[minor(dev)];
- u_char *cp = NULL;
- int cc = 0;
- u_char locbuf[BUFSIZ];
- int wcnt = 0;
- struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
- int error = 0;
-
- tty_lock(tp);
-
-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 ((uio_resid(uio) > 0 || cc > 0) &&
- tp->t_canq.c_cc < TTYHOG - 1) {
- if (cc == 0) {
- cc = min(uio_resid(uio), BUFSIZ);
- cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
- cp = locbuf;
- error = uiomove((caddr_t)cp, cc, uio);
- if (error)
- goto out;
- /* check again for safety */
- if ((tp->t_state & TS_ISOPEN) == 0) {
- /* adjust as usual */
- uio_setresid(uio, (uio_resid(uio) + cc));
- error = EIO;
- goto out;
- }
- }
- if (cc > 0) {
- cc = b_to_q((u_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_setresid(uio, (uio_resid(uio) + cc));
- (void) putc(0, &tp->t_canq);
- ttwakeup(tp);
- wakeup(TSA_PTS_READ(tp));
- goto out;
- }
- while (uio_resid(uio) > 0 || cc > 0) {
- if (cc == 0) {
- cc = min(uio_resid(uio), BUFSIZ);
- cp = locbuf;
- error = uiomove((caddr_t)cp, cc, uio);
- if (error)
- goto out;
- /* check again for safety */
- if ((tp->t_state & TS_ISOPEN) == 0) {
- /* adjust for data copied in but not written */
- uio_setresid(uio, (uio_resid(uio) + cc));
- error = EIO;
- goto out;
- }
- }
- 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);
- wcnt++;
- cc--;
- }
- cc = 0;
- }
-out:
- tty_unlock(tp);
-
- return (error);
-
-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_setresid(uio, (uio_resid(uio) + cc));
- error = EIO;
- goto out;
- }
- if (flag & IO_NDELAY) {
- /* adjust for data copied in but not written */
- uio_setresid(uio, (uio_resid(uio) + cc));
- if (wcnt == 0)
- error = EWOULDBLOCK;
- goto out;
- }
- error = ttysleep(tp, TSA_PTC_WRITE(tp), TTOPRI | PCATCH, "ptcout", 0);
- if (error) {
- /* adjust for data copied in but not written */
- uio_setresid(uio, (uio_resid(uio) + cc));
- goto out;
- }
- goto again;
-}
-
-__private_extern__ int
-ptyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
-{
- struct tty *tp = pt_tty[minor(dev)];
- struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
- u_char *cc = tp->t_cc;
- int stop, error = 0;
-
- tty_lock(tp);
-
- /*
- * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
- * ttywflush(tp) will hang if there are characters in the outq.
- */
- 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 (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;
- }
- goto out;
- } else
- if (cdevsw[major(dev)].d_open == ptcopen)
- switch (cmd) {
-
- case TIOCGPGRP:
- /*
- * We aviod 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;
- goto out;
-
- case TIOCPKT:
- if (*(int *)data) {
- if (pti->pt_flags & PF_UCNTL) {
- error = EINVAL;
- goto out;
- }
- pti->pt_flags |= PF_PKT;
- } else
- pti->pt_flags &= ~PF_PKT;
- goto out;
-
- case TIOCUCNTL:
- if (*(int *)data) {
- if (pti->pt_flags & PF_PKT) {
- error = EINVAL;
- goto out;
- }
- pti->pt_flags |= PF_UCNTL;
- } else
- pti->pt_flags &= ~PF_UCNTL;
- goto out;
-
- case TIOCREMOTE:
- if (*(int *)data)
- pti->pt_flags |= PF_REMOTE;
- else
- pti->pt_flags &= ~PF_REMOTE;
- ttyflush(tp, FREAD|FWRITE);
- goto out;
-
- case TIOCSETP:
- case TIOCSETN:
- case TIOCSETD:
- case TIOCSETA_32:
- case TIOCSETAW_32:
- case TIOCSETAF_32:
- case TIOCSETA_64:
- case TIOCSETAW_64:
- case TIOCSETAF_64:
- ndflush(&tp->t_outq, tp->t_outq.c_cc);
- break;
-
- case TIOCSIG:
- if (*(unsigned int *)data >= NSIG ||
- *(unsigned int *)data == 0) {
- error = EINVAL;
- goto out;
- }
- if ((tp->t_lflag&NOFLSH) == 0)
- ttyflush(tp, FREAD|FWRITE);
- if ((*(unsigned int *)data == SIGINFO) &&
- ((tp->t_lflag&NOKERNINFO) == 0))
- ttyinfo_locked(tp);
- /*
- * SAFE: All callers drop the lock on return and
- * SAFE: the linesw[] will short circut this call
- * SAFE: if the ioctl() is eaten before the lower
- * SAFE: level code gets to see it.
- */
- tty_unlock(tp);
- tty_pgsignal(tp, *(unsigned int *)data, 1);
- tty_lock(tp);
- goto out;
-
- case TIOCPTYGRANT: /* grantpt(3) */
- /*
- * Change the uid of the slave to that of the calling
- * thread, change the gid of the slave to GID_TTY,
- * change the mode to 0620 (rw--w----).
- */
- {
- _devfs_setattr(pti->pt_devhandle, 0620, kauth_getuid(), GID_TTY);
- goto out;
- }
-
- case TIOCPTYGNAME: /* ptsname(3) */
- /*
- * Report the name of the slave device in *data
- * (128 bytes max.). Use the same derivation method
- * used for calling devfs_make_node() to create it.
- */
- snprintf(data, 128, "/dev/tty%c%x",
- START_CHAR + (minor(dev) / HEX_BASE),
- minor(dev) % HEX_BASE);
- error = 0;
- goto out;
-
- case TIOCPTYUNLK: /* unlockpt(3) */
- /*
- * Unlock the slave device so that it can be opened.
- */
- error = 0;
- goto out;
- }
- error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
- if (error == ENOTTY) {
- error = ttioctl_locked(tp, cmd, data, flag, p);
- if (error == ENOTTY) {
- if (pti->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) {
- /* Process the UIOCMD ioctl group */
- if (cmd & 0xff) {
- pti->pt_ucntl = (u_char)cmd;
- ptcwakeup(tp, FREAD);
- }
- error = 0;
- goto out;
- } else if (cmd == TIOCSBRK || cmd == TIOCCBRK) {
- /*
- * POSIX conformance; rdar://3936338
- *
- * Clear ENOTTY in the case of setting or
- * clearing a break failing because pty's
- * don't support break like real serial
- * ports.
- */
- error = 0;
- goto out;
- }
- }
- }
-
- /*
- * If external processing and packet mode send ioctl packet.
- */
- if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
- switch(cmd) {
- case TIOCSETA_32:
- case TIOCSETAW_32:
- case TIOCSETAF_32:
- case TIOCSETA_64:
- case TIOCSETAW_64:
- case TIOCSETAF_64:
- case TIOCSETP:
- case TIOCSETN:
- case TIOCSETC:
- case TIOCSLTC:
- case TIOCLBIS:
- case TIOCLBIC:
- case TIOCLSET:
- 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);
- }
- }
-out:
- tty_unlock(tp);
-
- return (error);
-}
projects / apple / xnu.git / blobdiff