210 lines
6.0 KiB
C
210 lines
6.0 KiB
C
/* $NetBSD: wwiomux.c,v 1.3 1995/09/28 10:35:37 tls Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)wwiomux.c 8.1 (Berkeley) 6/6/93";
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#else
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static char rcsid[] = "$NetBSD: wwiomux.c,v 1.3 1995/09/28 10:35:37 tls Exp $";
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#endif
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#endif /* not lint */
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#include "ww.h"
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#include <sys/time.h>
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#include <sys/types.h>
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#if !defined(OLD_TTY) && !defined(TIOCPKT_DATA)
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#include <sys/ioctl.h>
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#endif
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#include <fcntl.h>
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/*
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* Multiple window output handler.
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* The idea is to copy window outputs to the terminal, via the
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* display package. We try to give wwcurwin highest priority.
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* The only return conditions are when there is keyboard input
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* and when a child process dies, which are serviced by signal
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* catchers (wwrint() and wwchild()).
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* When there's nothing to do, we sleep in a select().
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* This can be done better with interrupt driven io. But that's
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* not supported on ptys, yet.
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* The history of this routine is interesting.
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*/
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wwiomux()
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{
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register struct ww *w;
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fd_set imask;
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register n;
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register char *p;
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char c;
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struct timeval tv;
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char noblock = 0;
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for (;;) {
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if (wwinterrupt()) {
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wwclrintr();
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return;
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}
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FD_ZERO(&imask);
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n = -1;
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for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
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if (w->ww_pty < 0)
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continue;
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if (w->ww_obq < w->ww_obe) {
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if (w->ww_pty > n)
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n = w->ww_pty;
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FD_SET(w->ww_pty, &imask);
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}
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if (w->ww_obq > w->ww_obp && !w->ww_stopped)
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noblock = 1;
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}
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if (!noblock) {
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if (wwcurwin != 0)
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wwcurtowin(wwcurwin);
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wwupdate();
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wwflush();
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(void) setjmp(wwjmpbuf);
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wwsetjmp = 1;
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if (wwinterrupt()) {
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wwsetjmp = 0;
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wwclrintr();
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return;
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}
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/*
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* Defensive code. If somebody else (for example,
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* wall) clears the ASYNC flag on us, we will block
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* forever. So we need a finite timeout and set
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* the flag again. Anything more clever will probably
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* need even more system calls. (This is a bug
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* in the kernel.)
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* I don't like this one bit.
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*/
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(void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
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tv.tv_sec = 30;
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tv.tv_usec = 0;
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} else {
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tv.tv_sec = 0;
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tv.tv_usec = 10000;
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}
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wwnselect++;
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n = select(n + 1, &imask, (fd_set *)0, (fd_set *)0, &tv);
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wwsetjmp = 0;
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noblock = 0;
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if (n < 0)
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wwnselecte++;
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else if (n == 0)
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wwnselectz++;
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else
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for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
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if (w->ww_pty < 0 ||
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!FD_ISSET(w->ww_pty, &imask))
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continue;
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wwnwread++;
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p = w->ww_obq;
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if (w->ww_ispty) {
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if (p == w->ww_ob) {
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w->ww_obp++;
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w->ww_obq++;
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} else
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p--;
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c = *p;
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}
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n = read(w->ww_pty, p, w->ww_obe - p);
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if (n < 0) {
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wwnwreade++;
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(void) close(w->ww_pty);
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w->ww_pty = -1;
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} else if (n == 0) {
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wwnwreadz++;
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(void) close(w->ww_pty);
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w->ww_pty = -1;
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} else if (!w->ww_ispty) {
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wwnwreadd++;
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wwnwreadc += n;
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w->ww_obq += n;
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} else if (*p == TIOCPKT_DATA) {
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n--;
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wwnwreadd++;
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wwnwreadc += n;
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w->ww_obq += n;
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} else {
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wwnwreadp++;
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if (*p & TIOCPKT_STOP)
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w->ww_stopped = 1;
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if (*p & TIOCPKT_START)
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w->ww_stopped = 0;
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if (*p & TIOCPKT_FLUSHWRITE) {
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w->ww_stopped = 0;
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w->ww_obq = w->ww_obp =
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w->ww_ob;
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}
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}
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if (w->ww_ispty)
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*p = c;
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}
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/*
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* Try the current window first, if there is output
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* then process it and go back to the top to try again.
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* This can lead to starvation of the other windows,
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* but presumably that what we want.
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* Update will eventually happen when output from wwcurwin
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* dies down.
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*/
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if ((w = wwcurwin) != 0 && w->ww_pty >= 0 &&
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w->ww_obq > w->ww_obp && !w->ww_stopped) {
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n = wwwrite(w, w->ww_obp, w->ww_obq - w->ww_obp);
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if ((w->ww_obp += n) == w->ww_obq)
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w->ww_obq = w->ww_obp = w->ww_ob;
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noblock = 1;
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continue;
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}
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for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw)
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if (w->ww_pty >= 0 && w->ww_obq > w->ww_obp &&
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!w->ww_stopped) {
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n = wwwrite(w, w->ww_obp,
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w->ww_obq - w->ww_obp);
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if ((w->ww_obp += n) == w->ww_obq)
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w->ww_obq = w->ww_obp = w->ww_ob;
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if (wwinterrupt())
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break;
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}
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}
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}
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