usr/src/lib/libbc/libc/gen/common/isatty.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 #pragma ident   "%Z%%M% %I%     %E% SMI"  /* from S5R3 1.7 */
  23 /*      Copyright (c) 1984 AT&T */
  24 /*        All Rights Reserved   */
  25
  26
  27 /*LINTLIBRARY*/
  28 /*
  29  * Returns 1 iff file is a tty
  30  */
  31 #include <sys/termio.h>
  32
  33 extern int ioctl();
  34 extern int errno;
  35
  36 int
  37 isatty(f)
  38 int     f;
  39 {
  40         struct termio tty;
  41         int err ;
  42
  43         err = errno;
  44         if(ioctl(f, TCGETA, &tty) < 0)
  45         {
  46                 errno = err;
  47                 return(0);
  48         }
  49         return(1);
  50 }