1/* Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc. 2 This file is part of the GNU IO Library. 3 4 This library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU General Public License as 6 published by the Free Software Foundation; either version 2, or (at 7 your option) any later version. 8 9 This library is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this library; see the file COPYING. If not, write to 16 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 17 MA 02111-1307, USA. 18 19 As a special exception, if you link this library with files 20 compiled with a GNU compiler to produce an executable, this does 21 not cause the resulting executable to be covered by the GNU General 22 Public License. This exception does not however invalidate any 23 other reasons why the executable file might be covered by the GNU 24 General Public License. */ 25 26#ifdef __STDC__ 27#include <stdlib.h> 28#endif 29#include "libioP.h" 30#include <fcntl.h> 31 32#ifndef _IO_fcntl 33#define _IO_fcntl fcntl 34#endif 35 36_IO_FILE * 37_IO_fdopen (fd, mode) 38 int fd; 39 const char *mode; 40{ 41 int read_write; 42 int posix_mode = 0; 43 struct locked_FILE 44 { 45 struct _IO_FILE_plus fp; 46#ifdef _IO_MTSAFE_IO 47 _IO_lock_t lock; 48#endif 49 } *new_f; 50 int fd_flags; 51 52 switch (*mode++) 53 { 54 case 'r': 55 read_write = _IO_NO_WRITES; 56 break; 57 case 'w': 58 read_write = _IO_NO_READS; 59 break; 60 case 'a': 61 posix_mode = O_APPEND; 62 read_write = _IO_NO_READS|_IO_IS_APPENDING; 63 break; 64 default: 65 MAYBE_SET_EINVAL; 66 return NULL; 67 } 68 if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) 69 read_write &= _IO_IS_APPENDING; 70#ifdef F_GETFL 71 fd_flags = _IO_fcntl (fd, F_GETFL); 72#ifndef O_ACCMODE 73#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) 74#endif 75 if (fd_flags == -1 76 || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES)) 77 || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS))) 78 return NULL; 79 80 /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b) 81 [System Application Program Interface (API) Amendment 1: 82 Realtime Extensions], Rationale B.8.3.3 83 Open a Stream on a File Descriptor says: 84 85 Although not explicitly required by POSIX.1, a good 86 implementation of append ("a") mode would cause the 87 O_APPEND flag to be set. 88 89 (Historical implementations [such as Solaris2] do a one-time 90 seek in fdopen.) 91 92 However, we do not turn O_APPEND off if the mode is "w" (even 93 though that would seem consistent) because that would be more 94 likely to break historical programs. 95 */ 96 if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND)) 97 { 98#ifdef F_SETFL 99 if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1) 100#endif 101 return NULL; 102 } 103#endif 104 105 new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); 106 if (new_f == NULL) 107 return NULL; 108#ifdef _IO_MTSAFE_IO 109 new_f->fp.file._lock = &new_f->lock; 110#endif 111 _IO_init (&new_f->fp.file, 0); 112 _IO_JUMPS (&new_f->fp.file) = &_IO_file_jumps; 113 _IO_file_init (&new_f->fp.file); 114#if !_IO_UNIFIED_JUMPTABLES 115 new_f->fp.vtable = NULL; 116#endif 117 if (_IO_file_attach (&new_f->fp.file, fd) == NULL) 118 { 119 _IO_un_link (&new_f->fp.file); 120 free (new_f); 121 return NULL; 122 } 123 new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE; 124 125 new_f->fp.file._IO_file_flags = 126 _IO_mask_flags (&new_f->fp.file, read_write, 127 _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); 128 129 return (_IO_FILE *) &new_f->fp; 130} 131 132#ifdef weak_alias 133weak_alias (_IO_fdopen, fdopen) 134#endif 135