lib/libc/termios/tcflow.c

   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 }