| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /* $OpenBSD: fdopen.c,v 1.5 2005/08/08 08:05:36 espie Exp $ */ |
| 2 | /*- |
| 3 | * Copyright (c) 1990, 1993 |
| 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software contributed to Berkeley by |
| 7 | * Chris Torek. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #include <sys/types.h> |
| 35 | #include <fcntl.h> |
| 36 | #include <unistd.h> |
| 37 | #include <stdio.h> |
| 38 | #include <errno.h> |
| 39 | #include "local.h" |
| 40 | |
| 41 | FILE * |
| 42 | fdopen(int fd, const char *mode) |
| 43 | { |
| 44 | FILE *fp; |
| 45 | int flags, oflags, fdflags, tmp; |
| 46 | |
| 47 | if ((flags = __sflags(mode, &oflags)) == 0) |
| 48 | return (NULL); |
| 49 | |
| 50 | /* Make sure the mode the user wants is a subset of the actual mode. */ |
| 51 | if ((fdflags = fcntl(fd, F_GETFL, 0)) < 0) |
| 52 | return (NULL); |
| 53 | tmp = fdflags & O_ACCMODE; |
| 54 | if (tmp != O_RDWR && (tmp != (oflags & O_ACCMODE))) { |
| 55 | errno = EINVAL; |
| 56 | return (NULL); |
| 57 | } |
| 58 | |
| 59 | if ((fp = __sfp()) == NULL) |
| 60 | return (NULL); |
| 61 | fp->_flags = flags; |
| 62 | /* |
| 63 | * If opened for appending, but underlying descriptor does not have |
| 64 | * O_APPEND bit set, assert __SAPP so that __swrite() will lseek to |
| 65 | * end before each write. |
| 66 | */ |
| 67 | if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) |
| 68 | fp->_flags |= __SAPP; |
| 69 | fp->_file = fd; |
| 70 | fp->_cookie = fp; |
| 71 | fp->_read = __sread; |
| 72 | fp->_write = __swrite; |
| 73 | fp->_seek = __sseek; |
| 74 | fp->_close = __sclose; |
| 75 | return (fp); |
| 76 | } |