Home | History | Annotate | Line # | Download | only in termios 
      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 	struct termios term;
     57 	u_char c;
     58 
     59 	_DIAGASSERT(fd != -1);
     60 
     61 	switch (action) {
     62 	case TCOOFF:
     63 		return (ioctl(fd, TIOCSTOP, 0));
     64 	case TCOON:
     65 		return (ioctl(fd, TIOCSTART, 0));
     66 	case TCION:
     67 	case TCIOFF:
     68 		if (tcgetattr(fd, &term) == -1)
     69 			return (-1);
     70 		c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
     71 		if (c != _POSIX_VDISABLE && write(fd, &c, sizeof(c)) == -1)
     72 			return (-1);
     73 		return (0);
     74 	default:
     75 		errno = EINVAL;
     76 		return (-1);
     77 	}
     78 	/* NOTREACHED */
     79 }
     80