1 /* $NetBSD: fdopen.c,v 1.14 2003/08/07 16:43:22 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)fdopen.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: fdopen.c,v 1.14 2003/08/07 16:43:22 agc Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 #include <sys/types.h> 46 47 #include <assert.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <unistd.h> 51 #include <stdio.h> 52 53 #include "reentrant.h" 54 #include "local.h" 55 56 #ifdef __weak_alias 57 __weak_alias(fdopen,_fdopen) 58 #endif 59 60 FILE * 61 fdopen(fd, mode) 62 int fd; 63 const char *mode; 64 { 65 FILE *fp; 66 int flags, oflags, fdflags, tmp; 67 68 _DIAGASSERT(fd != -1); 69 70 if ((flags = __sflags(mode, &oflags)) == 0) 71 return (NULL); 72 73 /* Make sure the mode the user wants is a subset of the actual mode. */ 74 if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) 75 return (NULL); 76 tmp = fdflags & O_ACCMODE; 77 if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { 78 errno = EINVAL; 79 return (NULL); 80 } 81 82 if (oflags & O_NONBLOCK) { 83 struct stat st; 84 if (fstat(fd, &st) == -1) { 85 return (NULL); 86 } 87 if (!S_ISREG(st.st_mode)) { 88 errno = EFTYPE; 89 return (NULL); 90 } 91 } 92 93 if ((fp = __sfp()) == NULL) 94 return (NULL); 95 fp->_flags = flags; 96 /* 97 * If opened for appending, but underlying descriptor does not have 98 * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to 99 * end before each write. 100 */ 101 if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) 102 fp->_flags |= __SAPP; 103 fp->_file = fd; 104 fp->_cookie = fp; 105 fp->_read = __sread; 106 fp->_write = __swrite; 107 fp->_seek = __sseek; 108 fp->_close = __sclose; 109 return (fp); 110 } 111