135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
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/* Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc.
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This file is part of the GNU IO Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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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
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not cause the resulting executable to be covered by the GNU General
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Public License. This exception does not however invalidate any
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other reasons why the executable file might be covered by the GNU
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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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_IO_fdopen (fd, mode)
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int fd;
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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 locked_FILE
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{
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struct _IO_FILE_plus fp;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_t lock;
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#endif
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} *new_f;
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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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MAYBE_SET_EINVAL;
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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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new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
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if (new_f == NULL)
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return NULL;
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#ifdef _IO_MTSAFE_IO
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new_f->fp.file._lock = &new_f->lock;
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#endif
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_IO_init (&new_f->fp.file, 0);
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_IO_JUMPS (&new_f->fp.file) = &_IO_file_jumps;
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_IO_file_init (&new_f->fp.file);
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#if !_IO_UNIFIED_JUMPTABLES
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new_f->fp.vtable = NULL;
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#endif
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if (_IO_file_attach (&new_f->fp.file, fd) == NULL)
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{
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_IO_un_link (&new_f->fp.file);
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free (new_f);
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return NULL;
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}
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new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE;
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new_f->fp.file._IO_file_flags =
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_IO_mask_flags (&new_f->fp.file, read_write,
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_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
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return (_IO_FILE *) &new_f->fp;
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}
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#ifdef weak_alias
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weak_alias (_IO_fdopen, fdopen)
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#endif
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