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 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Check to see if a file descriptor is that of a stream. 34 * Return 1 with errno set to 0 if it is. Otherwise, 35 * return 0 with errno set to 0. 36 * The only error returned is that case of a bad file desc. 37 * 38 */ 39 40 #pragma weak _isastream = isastream 41 42 #include "lint.h" 43 #include <sys/types.h> 44 #include <stdio.h> 45 #include <errno.h> 46 #include <stropts.h> 47 48 int 49 isastream(int fd) 50 { 51 int rval; 52 53 rval = ioctl(fd, I_CANPUT, 0); 54 if (rval == -1 && errno == EBADF) 55 return (-1); 56 57 errno = 0; 58 if (rval == 0 || rval == 1) 59 return (1); 60 61 return (0); 62 } 63