1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)fdopen.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/fdopen.c,v 1.11 2008/05/10 18:39:20 antoine Exp $ 34 * $DragonFly: src/lib/libc/stdio/fdopen.c,v 1.6 2005/07/23 20:23:05 joerg Exp $ 35 */ 36 37 #include "namespace.h" 38 #include <sys/types.h> 39 #include <fcntl.h> 40 #include <unistd.h> 41 #include <stdio.h> 42 #include <errno.h> 43 #include "un-namespace.h" 44 45 #include "local.h" 46 #include "priv_stdio.h" 47 48 FILE * 49 fdopen(int fd, const char *mode) 50 { 51 FILE *fp; 52 int flags, oflags, fdflags, tmp; 53 54 if ((flags = __sflags(mode, &oflags)) == 0) 55 return (NULL); 56 57 /* Make sure the mode the user wants is a subset of the actual mode. */ 58 if ((fdflags = _fcntl(fd, F_GETFL, 0)) < 0) 59 return (NULL); 60 tmp = fdflags & O_ACCMODE; 61 if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { 62 errno = EINVAL; 63 return (NULL); 64 } 65 66 if ((fp = __sfp()) == NULL) 67 return (NULL); 68 fp->pub._flags = flags; 69 /* 70 * If opened for appending, but underlying descriptor does not have 71 * O_APPEND bit set, assert __SAPP so that __swrite() caller 72 * will _sseek() to the end before write. 73 */ 74 if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) 75 fp->pub._flags |= __SAPP; 76 fp->pub._fileno = fd; 77 fp->_cookie = fp; 78 fp->_read = __sread; 79 fp->_write = __swrite; 80 fp->_seek = __sseek; 81 fp->_close = __sclose; 82 return (fp); 83 } 84