1 /* $NetBSD: tcflow.c,v 1.3 1997/07/13 20:26:22 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)termios.c 8.2 (Berkeley) 2/21/94"; 40 #else 41 __RCSID("$NetBSD: tcflow.c,v 1.3 1997/07/13 20:26:22 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/ioctl.h> 46 #include <termios.h> 47 #include <unistd.h> 48 #include <errno.h> 49 50 int 51 tcflow(fd, action) 52 int fd, action; 53 { 54 struct termios term; 55 u_char c; 56 57 switch (action) { 58 case TCOOFF: 59 return (ioctl(fd, TIOCSTOP, 0)); 60 case TCOON: 61 return (ioctl(fd, TIOCSTART, 0)); 62 case TCION: 63 case TCIOFF: 64 if (tcgetattr(fd, &term) == -1) 65 return (-1); 66 c = term.c_cc[action == TCIOFF ? VSTOP : VSTART]; 67 if (c != _POSIX_VDISABLE && write(fd, &c, sizeof(c)) == -1) 68 return (-1); 69 return (0); 70 default: 71 errno = EINVAL; 72 return (-1); 73 } 74 /* NOTREACHED */ 75 } 76