243 lines
6.4 KiB
C
243 lines
6.4 KiB
C
/* $NetBSD: wwiomux.c,v 1.13 2006/12/18 20:04:55 christos 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. 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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#include <sys/cdefs.h>
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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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__RCSID("$NetBSD: wwiomux.c,v 1.13 2006/12/18 20:04:55 christos Exp $");
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#endif
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#endif /* not lint */
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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 <sys/time.h>
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#include <poll.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <err.h>
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#include "ww.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.
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* When there's nothing to do, we sleep in a select().
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* The history of this routine is interesting.
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*/
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void
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wwiomux(void)
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{
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struct ww *w;
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int nfd;
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int volatile dostdin; /* avoid longjmp clobbering */
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char volatile c; /* avoid longjmp clobbering */
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char *p;
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int millis;
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char noblock = 0;
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static struct pollfd *pfd = NULL;
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static size_t maxfds = 0;
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c = 0; /* XXXGCC -Wuninitialized */
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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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nfd = 0;
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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_obe)
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continue;
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nfd++;
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}
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if (maxfds <= ++nfd) { /* One more for the fd=0 case below */
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struct pollfd *npfd = pfd == NULL ?
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malloc(sizeof(*pfd) * nfd) :
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realloc(pfd, sizeof(*pfd) * nfd);
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if (npfd == NULL) {
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warn("will retry");
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if (pfd)
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free(pfd);
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pfd = NULL;
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maxfds = 0;
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return;
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}
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pfd = npfd;
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maxfds = nfd;
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}
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nfd = 0;
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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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pfd[nfd].fd = w->ww_pty;
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pfd[nfd++].events = POLLIN;
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}
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if (w->ww_obq > w->ww_obp &&
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!ISSET(w->ww_pflags, WWP_STOPPED))
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noblock = 1;
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}
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if (wwibq < wwibe) {
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dostdin = nfd;
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pfd[nfd].fd = 0;
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pfd[nfd++].events = POLLIN;
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} else {
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dostdin = -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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/* XXXX */
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millis = 30000;
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} else {
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millis = 10;
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}
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wwnselect++;
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nfd = poll(pfd, nfd, millis);
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wwsetjmp = 0;
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noblock = 0;
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if (nfd < 0)
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wwnselecte++;
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else if (nfd == 0)
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wwnselectz++;
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else {
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if (dostdin != -1 && (pfd[dostdin].revents & POLLIN) != 0)
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wwrint();
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nfd = 0;
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for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
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int n;
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if (w->ww_pty < 0)
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continue;
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if (w->ww_pty != pfd[nfd].fd)
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continue;
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if ((pfd[nfd++].revents & POLLIN) == 0)
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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_type == WWT_PTY) {
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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_type != WWT_PTY) {
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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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SET(w->ww_pflags, WWP_STOPPED);
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if (*p & TIOCPKT_START)
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CLR(w->ww_pflags, WWP_STOPPED);
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if (*p & TIOCPKT_FLUSHWRITE) {
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CLR(w->ww_pflags, WWP_STOPPED);
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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_type == WWT_PTY)
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*p = c;
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}
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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 &&
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!ISSET(w->ww_pflags, WWP_STOPPED)) {
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int 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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!ISSET(w->ww_pflags, WWP_STOPPED)) {
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int 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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