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