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 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 /* 34 * Check to see if a file descriptor is that of a stream. 35 * Return 1 with errno set to 0 if it is. Otherwise, 36 * return 0 with errno set to 0. 37 * The only error returned is that case of a bad file desc. 38 * 39 */ 40 41 #pragma weak isastream = _isastream 42 43 #include "synonyms.h" 44 #include <sys/types.h> 45 #include <stdio.h> 46 #include <errno.h> 47 #include <stropts.h> 48 49 int 50 isastream(int fd) 51 { 52 int rval; 53 54 rval = ioctl(fd, I_CANPUT, 0); 55 if (rval == -1 && errno == EBADF) 56 return (-1); 57 58 errno = 0; 59 if (rval == 0 || rval == 1) 60 return (1); 61 62 return (0); 63 } 64