1 /* $NetBSD: wwrint.c,v 1.7 2003/08/07 11:17:44 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Edward Wang at The University of California, Berkeley. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)wwrint.c 8.1 (Berkeley) 6/6/93"; 39 #else 40 __RCSID("$NetBSD: wwrint.c,v 1.7 2003/08/07 11:17:44 agc Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <unistd.h> 45 #include "ww.h" 46 #include "tt.h" 47 48 /* 49 * Tty input interrupt handler. 50 * (1) Read input into buffer (wwib*). 51 * (2) Set the interrupt flag if anything is read. 52 * Currently, the last is used to get out of the blocking 53 * select() in wwiomux(). 54 * To avoid race conditions, we only modify wwibq in here, except 55 * when the buffer is empty; and everywhere else, we only change wwibp. 56 * It should be completely safe. 57 */ 58 void 59 wwrint(void) 60 { 61 int n; 62 63 wwnread++; 64 n = read(0, wwibq, wwibe - wwibq); 65 if (n > 0) { 66 if (tt.tt_rint) 67 n = (*tt.tt_rint)(wwibq, n); 68 if (n > 0) { 69 wwibq += n; 70 wwnreadc += n; 71 /* 72 * Hasten or delay the next checkpoint, 73 * as the case may be. 74 */ 75 if (tt.tt_checkpoint && !wwdocheckpoint) 76 (void) alarm(1); 77 wwsetintr(); 78 } 79 } else if (n == 0) 80 wwnreadz++; 81 else 82 wwnreade++; 83 } 84