1 /* $NetBSD: tcflow.c,v 1.9 2012/06/25 22:32:46 abs 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)termios.c 8.2 (Berkeley) 2/21/94"; 36 #else 37 __RCSID("$NetBSD: tcflow.c,v 1.9 2012/06/25 22:32:46 abs Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/ioctl.h> 43 44 #include <assert.h> 45 #include <errno.h> 46 #include <termios.h> 47 #include <unistd.h> 48 49 #ifdef __weak_alias 50 __weak_alias(tcflow,_tcflow) 51 #endif 52 53 int 54 tcflow(int fd, int action) 55 { 56 #ifdef __minix 57 _DIAGASSERT(fd != -1); 58 return ioctl(fd, TCFLOW, &action); 59 #else /* !__minix */ 60 struct termios term; 61 u_char c; 62 63 _DIAGASSERT(fd != -1); 64 65 switch (action) { 66 case TCOOFF: 67 return (ioctl(fd, TIOCSTOP, 0)); 68 case TCOON: 69 return (ioctl(fd, TIOCSTART, 0)); 70 case TCION: 71 case TCIOFF: 72 if (tcgetattr(fd, &term) == -1) 73 return (-1); 74 c = term.c_cc[action == TCIOFF ? VSTOP : VSTART]; 75 if (c != _POSIX_VDISABLE && write(fd, &c, sizeof(c)) == -1) 76 return (-1); 77 return (0); 78 default: 79 errno = EINVAL; 80 return (-1); 81 } 82 /* NOTREACHED */ 83 #endif /* !__minix */ 84 } 85