lib/libc/termios/tcflow.c

   1 /*      $NetBSD: tcflow.c,v 1.8 2003/08/07 16:44:13 agc 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 1.8 2003/08/07 16:44:13 agc 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(fd, action)
  55         int fd, action;
  56 {
  57 #ifdef __minix
  58         _DIAGASSERT(fd != -1);
  59         return ioctl(fd, TCFLOW, &action);
  60 #else /* !__minix */
  61         struct termios term;
  62         u_char c;
  63
  64         _DIAGASSERT(fd != -1);
  65
  66         switch (action) {
  67         case TCOOFF:
  68                 return (ioctl(fd, TIOCSTOP, 0));
  69         case TCOON:
  70                 return (ioctl(fd, TIOCSTART, 0));
  71         case TCION:
  72         case TCIOFF:
  73                 if (tcgetattr(fd, &term) == -1)
  74                         return (-1);
  75                 c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
  76                 if (c != _POSIX_VDISABLE && write(fd, &c, sizeof(c)) == -1)
  77                         return (-1);
  78                 return (0);
  79         default:
  80                 errno = EINVAL;
  81                 return (-1);
  82         }
  83         /* NOTREACHED */
  84 #endif /* !__minix */
  85 }