1 /* $OpenBSD: tcflow.c,v 1.5 2005/08/05 13:03:00 espie Exp $ */ 2 /*- 3 * Copyright (c) 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/ioctl.h> 32 #include <termios.h> 33 #include <unistd.h> 34 #include <errno.h> 35 36 int 37 tcflow(int fd, int action) 38 { 39 struct termios term; 40 u_char c; 41 42 switch (action) { 43 case TCOOFF: 44 return (ioctl(fd, TIOCSTOP, 0)); 45 case TCOON: 46 return (ioctl(fd, TIOCSTART, 0)); 47 case TCION: 48 case TCIOFF: 49 if (tcgetattr(fd, &term) == -1) 50 return (-1); 51 c = term.c_cc[action == TCIOFF ? VSTOP : VSTART]; 52 if (c != _POSIX_VDISABLE && write(fd, &c, sizeof(c)) == -1) 53 return (-1); 54 return (0); 55 default: 56 errno = EINVAL; 57 return (-1); 58 } 59 /* NOTREACHED */ 60 } 61