| /* |
| Copyright (C) 1993, 1994 Free Software Foundation |
| |
| This file is part of the GNU IO Library. This library is free |
| software; you can redistribute it and/or modify it under the |
| terms of the GNU General Public License as published by the |
| Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this library; see the file COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| |
| As a special exception, if you link this library with files |
| compiled with a GNU compiler to produce an executable, this does not cause |
| the resulting executable to be covered by the GNU General Public License. |
| This exception does not however invalidate any other reasons why |
| the executable file might be covered by the GNU General Public License. */ |
| |
| #ifdef __STDC__ |
| #include <stdlib.h> |
| #endif |
| #include "libioP.h" |
| #include <fcntl.h> |
| |
| #ifndef _IO_fcntl |
| #define _IO_fcntl fcntl |
| #endif |
| |
| _IO_FILE * |
| DEFUN(_IO_fdopen, (fd, mode), |
| int fd AND const char *mode) |
| { |
| int read_write; |
| int posix_mode = 0; |
| struct _IO_FILE_plus *fp; |
| int fd_flags; |
| |
| switch (*mode++) |
| { |
| case 'r': |
| read_write = _IO_NO_WRITES; |
| break; |
| case 'w': |
| read_write = _IO_NO_READS; |
| break; |
| case 'a': |
| posix_mode = O_APPEND; |
| read_write = _IO_NO_READS|_IO_IS_APPENDING; |
| break; |
| default: |
| #ifdef EINVAL |
| errno = EINVAL; |
| #endif |
| return NULL; |
| } |
| if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) |
| read_write &= _IO_IS_APPENDING; |
| #ifdef F_GETFL |
| fd_flags = _IO_fcntl (fd, F_GETFL); |
| #ifndef O_ACCMODE |
| #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) |
| #endif |
| if (fd_flags == -1 |
| || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES)) |
| || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS))) |
| return NULL; |
| |
| /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b) |
| [System Application Program Interface (API) Amendment 1: |
| Realtime Extensions], Rationale B.8.3.3 |
| Open a Stream on a File Descriptor says: |
| |
| Although not explicitly required by POSIX.1, a good |
| implementation of append ("a") mode would cause the |
| O_APPEND flag to be set. |
| |
| (Historical implementations [such as Solaris2] do a one-time |
| seek in fdopen.) |
| |
| However, we do not turn O_APPEND off if the mode is "w" (even |
| though that would seem consistent) because that would be more |
| likely to break historical programs. |
| */ |
| if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND)) |
| { |
| #ifdef F_SETFL |
| if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1) |
| #endif |
| return NULL; |
| } |
| #endif |
| |
| fp = (struct _IO_FILE_plus*)malloc(sizeof(struct _IO_FILE_plus)); |
| if (fp == NULL) |
| return NULL; |
| _IO_init(&fp->file, 0); |
| _IO_JUMPS(&fp->file) = &_IO_file_jumps; |
| _IO_file_init(&fp->file); |
| #if !_IO_UNIFIED_JUMPTABLES |
| fp->vtable = NULL; |
| #endif |
| if (_IO_file_attach(&fp->file, fd) == NULL) |
| { |
| _IO_un_link(&fp->file); |
| free (fp); |
| return NULL; |
| } |
| fp->file._flags &= ~_IO_DELETE_DONT_CLOSE; |
| |
| fp->file._IO_file_flags = |
| _IO_mask_flags(&fp->file, read_write, |
| _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); |
| |
| return (_IO_FILE*)fp; |
| } |