f1f29c8b8d
encountered, such as a USB serial device being unplugged. Instead of spinning, the process reading from the serial line will exit, leaving the process reading from the local terminal to exit when it notices that its child has gone away.
170 lines
4.3 KiB
C
170 lines
4.3 KiB
C
/* $NetBSD: tipout.c,v 1.9 2005/12/09 03:15:42 gavan 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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* 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[] = "@(#)tipout.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: tipout.c,v 1.9 2005/12/09 03:15:42 gavan Exp $");
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#endif /* not lint */
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#include "tip.h"
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/*
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* tip
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*
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* lower fork of tip -- handles passive side
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* reading from the remote host
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*/
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static jmp_buf sigbuf;
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void intEMT __P((int));
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void intIOT __P((int));
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void intSYS __P((int));
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void intTERM __P((int));
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/*
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* TIPOUT wait state routine --
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* sent by TIPIN when it wants to posses the remote host
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*/
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void
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intIOT(dummy)
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int dummy;
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{
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write(repdes[1],&ccc,1);
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read(fildes[0], &ccc,1);
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longjmp(sigbuf, 1);
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}
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/*
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* Scripting command interpreter --
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* accepts script file name over the pipe and acts accordingly
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*/
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void
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intEMT(dummy)
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int dummy;
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{
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char c, line[256];
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char *pline = line;
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char reply;
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read(fildes[0], &c, 1);
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while (c != '\n' && line + sizeof line - pline > 0) {
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*pline++ = c;
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read(fildes[0], &c, 1);
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}
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*pline = '\0';
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if (boolean(value(SCRIPT)) && fscript != NULL)
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fclose(fscript);
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if (pline == line) {
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setboolean(value(SCRIPT), FALSE);
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reply = 'y';
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} else {
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if ((fscript = fopen(line, "a")) == NULL)
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reply = 'n';
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else {
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reply = 'y';
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setboolean(value(SCRIPT), TRUE);
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}
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}
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write(repdes[1], &reply, 1);
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longjmp(sigbuf, 1);
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}
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void
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intTERM(dummy)
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int dummy;
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{
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if (boolean(value(SCRIPT)) && fscript != NULL)
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fclose(fscript);
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exit(0);
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}
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void
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intSYS(dummy)
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int dummy;
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{
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setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY)));
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longjmp(sigbuf, 1);
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}
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/*
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* ****TIPOUT TIPOUT****
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*/
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void
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tipout()
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{
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char buf[BUFSIZ];
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char *cp;
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int cnt;
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int omask;
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGEMT, intEMT); /* attention from TIPIN */
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signal(SIGTERM, intTERM); /* time to go signal */
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signal(SIGIOT, intIOT); /* scripting going on signal */
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signal(SIGHUP, intTERM); /* for dial-ups */
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signal(SIGSYS, intSYS); /* beautify toggle */
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(void) setjmp(sigbuf);
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for (omask = 0;; sigsetmask(omask)) {
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cnt = read(FD, buf, BUFSIZ);
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if (cnt <= 0) {
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/* lost carrier || EOF */
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if ((cnt < 0 && errno == EIO) || (cnt == 0)) {
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sigblock(sigmask(SIGTERM));
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intTERM(0);
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/*NOTREACHED*/
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}
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continue;
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}
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#define ALLSIGS sigmask(SIGEMT)|sigmask(SIGTERM)|sigmask(SIGIOT)|sigmask(SIGSYS)
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omask = sigblock(ALLSIGS);
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for (cp = buf; cp < buf + cnt; cp++)
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*cp &= STRIP_PAR;
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write(1, buf, cnt);
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if (boolean(value(SCRIPT)) && fscript != NULL) {
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if (!boolean(value(BEAUTIFY))) {
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fwrite(buf, 1, cnt, fscript);
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continue;
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}
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for (cp = buf; cp < buf + cnt; cp++)
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if ((*cp >= ' ' && *cp <= '~') ||
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any(*cp, value(EXCEPTIONS)))
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putc(*cp, fscript);
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}
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}
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}
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