/* $OpenBSD: wwiomux.c,v 1.9 2003/07/10 00:06:52 david Exp $ */ /* $NetBSD: wwiomux.c,v 1.5 1996/02/08 20:45:09 mycroft Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Edward Wang at The University of California, Berkeley. * * 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. 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. */ #ifndef lint #if 0 static char sccsid[] = "@(#)wwiomux.c 8.1 (Berkeley) 6/6/93"; #else static char rcsid[] = "$OpenBSD: wwiomux.c,v 1.9 2003/07/10 00:06:52 david Exp $"; #endif #endif /* not lint */ #include "ww.h" #include <sys/time.h> #include <sys/types.h> #if !defined(OLD_TTY) && !defined(TIOCPKT_DATA) #include <sys/ioctl.h> #endif #include <fcntl.h> #include <string.h> #include <unistd.h> /* * Multiple window output handler. * The idea is to copy window outputs to the terminal, via the * display package. We try to give wwcurwin highest priority. * The only return conditions are when there is keyboard input * and when a child process dies. * When there's nothing to do, we sleep in a select(). * The history of this routine is interesting. */ wwiomux() { struct ww *w; fd_set imask; int n; char *p; char c; struct timeval tv; char noblock = 0; for (;;) { if (wwinterrupt()) { wwclrintr(); return; } FD_ZERO(&imask); n = -1; for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) { if (w->ww_pty < 0) continue; if (w->ww_obq < w->ww_obe) { if (w->ww_pty > n) n = w->ww_pty + 1; FD_SET(w->ww_pty, &imask); } if (w->ww_obq > w->ww_obp && !ISSET(w->ww_pflags, WWP_STOPPED)) noblock = 1; } if (wwibq < wwibe) { if (0 > n) n = 0 + 1; FD_SET(0, &imask); } if (!noblock) { if (wwcurwin != 0) wwcurtowin(wwcurwin); wwupdate(); wwflush(); (void) setjmp(wwjmpbuf); wwsetjmp = 1; if (wwinterrupt()) { wwsetjmp = 0; wwclrintr(); return; } /* XXXX */ tv.tv_sec = 30; tv.tv_usec = 0; } else { tv.tv_sec = 0; tv.tv_usec = 10000; } wwnselect++; n = select(n + 1, &imask, (fd_set *)0, (fd_set *)0, &tv); wwsetjmp = 0; noblock = 0; if (n < 0) wwnselecte++; else if (n == 0) wwnselectz++; else { if (FD_ISSET(0, &imask)) wwrint(); for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) { if (w->ww_pty < 0 || !FD_ISSET(w->ww_pty, &imask)) continue; wwnwread++; p = w->ww_obq; if (w->ww_type == WWT_PTY) { if (p == w->ww_ob) { w->ww_obp++; w->ww_obq++; } else p--; c = *p; } n = read(w->ww_pty, p, w->ww_obe - p); if (n < 0) { wwnwreade++; (void) close(w->ww_pty); w->ww_pty = -1; } else if (n == 0) { wwnwreadz++; (void) close(w->ww_pty); w->ww_pty = -1; } else if (w->ww_type != WWT_PTY) { wwnwreadd++; wwnwreadc += n; w->ww_obq += n; } else if (*p == TIOCPKT_DATA) { n--; wwnwreadd++; wwnwreadc += n; w->ww_obq += n; } else { wwnwreadp++; if (*p & TIOCPKT_STOP) SET(w->ww_pflags, WWP_STOPPED); if (*p & TIOCPKT_START) CLR(w->ww_pflags, WWP_STOPPED); if (*p & TIOCPKT_FLUSHWRITE) { CLR(w->ww_pflags, WWP_STOPPED); w->ww_obq = w->ww_obp = w->ww_ob; } } } } /* * Try the current window first, if there is output * then process it and go back to the top to try again. * This can lead to starvation of the other windows, * but presumably that what we want. * Update will eventually happen when output from wwcurwin * dies down. */ if ((w = wwcurwin) != 0 && w->ww_pty >= 0 && w->ww_obq > w->ww_obp && !ISSET(w->ww_pflags, WWP_STOPPED)) { n = wwwrite(w, w->ww_obp, w->ww_obq - w->ww_obp); if ((w->ww_obp += n) == w->ww_obq) w->ww_obq = w->ww_obp = w->ww_ob; noblock = 1; continue; } for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) if (w->ww_pty >= 0 && w->ww_obq > w->ww_obp && !ISSET(w->ww_pflags, WWP_STOPPED)) { n = wwwrite(w, w->ww_obp, w->ww_obq - w->ww_obp); if ((w->ww_obp += n) == w->ww_obq) w->ww_obq = w->ww_obp = w->ww_ob; if (wwinterrupt()) break; } } }