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 * 3. 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 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char rcsid[] = "$OpenBSD: fdopen.c,v 1.4 2004/09/28 18:12:43 otto Exp $"; 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include <sys/types.h> 38 #include <fcntl.h> 39 #include <unistd.h> 40 #include <stdio.h> 41 #include <errno.h> 42 #include "local.h" 43 44 FILE * 45 fdopen(int fd, const char *mode) 46 { 47 FILE *fp; 48 int flags, oflags, fdflags, tmp; 49 50 if ((flags = __sflags(mode, &oflags)) == 0) 51 return (NULL); 52 53 /* Make sure the mode the user wants is a subset of the actual mode. */ 54 if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) 55 return (NULL); 56 tmp = fdflags & O_ACCMODE; 57 if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { 58 errno = EINVAL; 59 return (NULL); 60 } 61 62 if ((fp = __sfp()) == NULL) 63 return (NULL); 64 fp->_flags = flags; 65 /* 66 * If opened for appending, but underlying descriptor does not have 67 * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to 68 * end before each write. 69 */ 70 if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) 71 fp->_flags |= __SAPP; 72 fp->_file = fd; 73 fp->_cookie = fp; 74 fp->_read = __sread; 75 fp->_write = __swrite; 76 fp->_seek = __sseek; 77 fp->_close = __sclose; 78 return (fp); 79 } 80