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tcflow.c revision 1.5 
      1 /*	$NetBSD: tcflow.c,v 1.5 1999/09/16 11:45:44 lukem 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 1.5 1999/09/16 11:45:44 lukem Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <sys/ioctl.h>
     47 
     48 #include <assert.h>
     49 #include <errno.h>
     50 #include <termios.h>
     51 #include <unistd.h>
     52 
     53 #ifdef __weak_alias
     54 __weak_alias(tcflow,_tcflow);
     55 #endif
     56 
     57 int
     58 tcflow(fd, action)
     59 	int fd, action;
     60 {
     61 	struct termios term;
     62 	u_char c;
     63 
     64 	_DIAGASSERT(fd != -1);
     65 #ifdef _DIAGNOSTIC
     66 	if (fd == -1) {
     67 		errno = EBADF;
     68 		return (-1);
     69 	}
     70 #endif
     71 
     72 	switch (action) {
     73 	case TCOOFF:
     74 		return (ioctl(fd, TIOCSTOP, 0));
     75 	case TCOON:
     76 		return (ioctl(fd, TIOCSTART, 0));
     77 	case TCION:
     78 	case TCIOFF:
     79 		if (tcgetattr(fd, &term) == -1)
     80 			return (-1);
     81 		c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
     82 		if (c != _POSIX_VDISABLE && write(fd, &c, sizeof(c)) == -1)
     83 			return (-1);
     84 		return (0);
     85 	default:
     86 		errno = EINVAL;
     87 		return (-1);
     88 	}
     89 	/* NOTREACHED */
     90 }
     91