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https://github.com/freebsd/freebsd-src
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Extend to use poll backend. If memory serves correctly, most of this was
adapted from NetBSD.. However, there are some differences in the tty system that are big enough to cause their code to not fit comfortably. Obtained from: NetBSD (I think)
This commit is contained in:
Peter Wemm
parent
6b8e64f55f
commit
6183953301
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=29354
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@ -36,7 +36,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tty.c 8.8 (Berkeley) 1/21/94
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* $Id: tty.c,v 1.94 1997/03/24 12:02:59 bde Exp $
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* $Id: tty.c,v 1.95 1997/09/02 20:05:54 bde Exp $
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*/
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/*-
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@ -83,6 +83,7 @@
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#include <sys/fcntl.h>
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#include <sys/conf.h>
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#include <sys/dkstat.h>
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#include <sys/poll.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/signalvar.h>
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@ -1031,35 +1032,34 @@ ttioctl(tp, cmd, data, flag)
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}
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int
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ttyselect(tp, rw, p)
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ttypoll(tp, events, p)
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struct tty *tp;
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int rw;
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int events;
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struct proc *p;
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{
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int s;
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int revents = 0;
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if (tp == NULL)
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return (ENXIO);
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if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
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return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
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| POLLHUP);
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s = spltty();
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switch (rw) {
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case FREAD:
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if (events & (POLLIN | POLLRDNORM))
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if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
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goto win;
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selrecord(p, &tp->t_rsel);
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break;
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case FWRITE:
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revents |= events & (POLLIN | POLLRDNORM);
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else
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selrecord(p, &tp->t_rsel);
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if (events & (POLLOUT | POLLWRNORM))
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if ((tp->t_outq.c_cc <= tp->t_lowat &&
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ISSET(tp->t_state, TS_CONNECTED))
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|| ISSET(tp->t_state, TS_ZOMBIE)) {
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win: splx(s);
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return (1);
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}
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selrecord(p, &tp->t_wsel);
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break;
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}
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|| ISSET(tp->t_state, TS_ZOMBIE))
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revents |= events & (POLLOUT | POLLWRNORM);
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else
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selrecord(p, &tp->t_wsel);
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splx(s);
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return (0);
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return (revents);
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}
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/*
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@ -1067,12 +1067,12 @@ win: splx(s);
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* cdevsw. It relies on a proper xxxdevtotty routine.
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*/
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int
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ttselect(dev, rw, p)
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ttpoll(dev, events, p)
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dev_t dev;
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int rw;
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int events;
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struct proc *p;
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{
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return ttyselect((*cdevsw[major(dev)]->d_devtotty)(dev), rw, p);
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return ttypoll((*cdevsw[major(dev)]->d_devtotty)(dev), events, p);
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}
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/*
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
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* $Id: tty_pty.c,v 1.44 1997/07/30 10:05:18 jmg Exp $
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* $Id: tty_pty.c,v 1.45 1997/09/02 20:05:55 bde Exp $
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*/
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/*
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@ -49,6 +49,7 @@
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#include <sys/tty.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/poll.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/signalvar.h>
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@ -74,19 +75,19 @@ static d_open_t ptcopen;
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static d_close_t ptcclose;
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static d_read_t ptcread;
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static d_write_t ptcwrite;
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static d_select_t ptcselect;
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static d_poll_t ptcpoll;
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#define CDEV_MAJOR_S 5
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#define CDEV_MAJOR_C 6
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static struct cdevsw pts_cdevsw =
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{ ptsopen, ptsclose, ptsread, ptswrite, /*5*/
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ptyioctl, ptsstop, nullreset, ptydevtotty,/* ttyp */
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ttselect, nommap, NULL, "pts", NULL, -1 };
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ttpoll, nommap, NULL, "pts", NULL, -1 };
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static struct cdevsw ptc_cdevsw =
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{ ptcopen, ptcclose, ptcread, ptcwrite, /*6*/
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ptyioctl, nullstop, nullreset, ptydevtotty,/* ptyp */
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ptcselect, nommap, NULL, "ptc", NULL, -1 };
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ptcpoll, nommap, NULL, "ptc", NULL, -1 };
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#if NPTY == 1
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@ -459,58 +460,53 @@ ptsstop(tp, flush)
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}
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static int
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ptcselect(dev, rw, p)
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ptcpoll(dev, events, p)
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dev_t dev;
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int rw;
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int events;
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struct proc *p;
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{
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register struct tty *tp = &pt_tty[minor(dev)];
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struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
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int revents = 0;
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int s;
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if ((tp->t_state & TS_CONNECTED) == 0)
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return (1);
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switch (rw) {
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return (seltrue(dev, events, p) | POLLHUP);
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case FREAD:
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/*
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* Need to block timeouts (ttrstart).
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*/
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s = spltty();
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if ((tp->t_state&TS_ISOPEN) &&
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tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
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splx(s);
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return (1);
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}
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splx(s);
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/* FALLTHROUGH */
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/*
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* Need to block timeouts (ttrstart).
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*/
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s = spltty();
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case 0: /* exceptional */
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if ((tp->t_state&TS_ISOPEN) &&
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((pti->pt_flags&PF_PKT && pti->pt_send) ||
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(pti->pt_flags&PF_UCNTL && pti->pt_ucntl)))
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return (1);
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selrecord(p, &pti->pt_selr);
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break;
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if (events & (POLLIN | POLLRDNORM))
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if ((tp->t_state & TS_ISOPEN) &&
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((tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) ||
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((pti->pt_flags & PF_PKT) && pti->pt_send) ||
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((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl)))
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revents |= events & (POLLIN | POLLRDNORM);
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if (events & (POLLOUT | POLLWRNORM))
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if (tp->t_state & TS_ISOPEN &&
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((pti->pt_flags & PF_REMOTE) ?
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(tp->t_canq.c_cc == 0) :
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((tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG - 2) ||
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(tp->t_canq.c_cc == 0 && (tp->t_iflag & ICANON)))))
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revents |= events & (POLLOUT | POLLWRNORM);
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case FWRITE:
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if (tp->t_state&TS_ISOPEN) {
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if (pti->pt_flags & PF_REMOTE) {
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if (tp->t_canq.c_cc == 0)
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return (1);
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} else {
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if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
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return (1);
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if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON))
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return (1);
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}
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}
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selrecord(p, &pti->pt_selw);
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break;
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if (events & POLLHUP)
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if ((tp->t_state & TS_CARR_ON) == 0)
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revents |= POLLHUP;
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if (revents == 0) {
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if (events & (POLLIN | POLLRDNORM))
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selrecord(p, &pti->pt_selr);
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if (events & (POLLOUT | POLLWRNORM))
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selrecord(p, &pti->pt_selw);
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}
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return (0);
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splx(s);
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return (revents);
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}
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static int
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@ -31,13 +31,14 @@
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* SUCH DAMAGE.
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*
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* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
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* $Id: tty_tty.c,v 1.16 1997/03/24 11:24:38 bde Exp $
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* $Id: tty_tty.c,v 1.17 1997/09/02 20:05:56 bde Exp $
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*/
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/*
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* Indirect driver for controlling tty.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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@ -52,14 +53,14 @@ static d_open_t cttyopen;
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static d_read_t cttyread;
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static d_write_t cttywrite;
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static d_ioctl_t cttyioctl;
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static d_select_t cttyselect;
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static d_poll_t cttypoll;
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#define CDEV_MAJOR 1
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/* Don't make static, fdesc_vnops uses this. */
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struct cdevsw ctty_cdevsw =
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{ cttyopen, nullclose, cttyread, cttywrite, /*1*/
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cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
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cttyselect, nommap, NULL, "ctty", NULL, -1 };
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cttypoll, nommap, NULL, "ctty", NULL, -1 };
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#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
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@ -160,16 +161,17 @@ cttyioctl(dev, cmd, addr, flag, p)
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/*ARGSUSED*/
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static int
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cttyselect(dev, flag, p)
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cttypoll(dev, events, p)
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dev_t dev;
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int flag;
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int events;
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struct proc *p;
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{
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struct vnode *ttyvp = cttyvp(p);
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if (ttyvp == NULL)
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return (1); /* try operation to get EOF/failure */
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return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
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/* try operation to get EOF/failure */
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return (seltrue(dev, events, p));
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return (VOP_POLL(ttyvp, events, p->p_ucred, p));
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}
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static ctty_devsw_installed = 0;
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