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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * Check to see if a file descriptor is that of a stream. 32 * Return 1 with errno set to 0 if it is. Otherwise, 33 * return 0 with errno set to 0. 34 * The only error returned is that case of a bad file desc. 35 * 36 */ 37 38 #pragma weak _isastream = isastream 39 40 #include "lint.h" 41 #include <sys/types.h> 42 #include <stdio.h> 43 #include <errno.h> 44 #include <stropts.h> 45 46 int 47 isastream(int fd) 48 { 49 int rval; 50 51 rval = ioctl(fd, I_CANPUT, 0); 52 if (rval == -1 && errno == EBADF) 53 return (-1); 54 55 errno = 0; 56 if (rval == 0 || rval == 1) 57 return (1); 58 59 return (0); 60 } 61