fdopen.c

来自「一个C源代码分析器」· C语言 代码 · 共 69 行

/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include <errno.h>
#include <stdio.h>
#include <hurd/fd.h>
#include <fcntl.h>
#include <hurd/io.h>

/* Defined in fopen.c.  */
extern int EXFUN(__getmode, (CONST char *mode, __io_mode *mptr));

/* Open a new stream on a given system file descriptor.  */
FILE *
DEFUN(fdopen, (fd, mode), int fd AND CONST char *mode)
{
  FILE *stream;
  __io_mode m;
  struct hurd_fd *d;
  error_t err;
  int openmodes;

  if (!__getmode (mode, &m))
    return NULL;

  d = _hurd_fd_get (fd);
  if (d == NULL)
    {
      errno = EBADF;
      return NULL;
    }

  if (err = HURD_FD_PORT_USE (d, __io_get_openmodes (port, &openmodes)))
    return __hurd_dfail (fd, err), NULL;

  /* Check the access mode.  */
  if ((m.__read && !(openmodes & O_READ)) ||
      (m.__write && !(openmodes & O_WRITE)))
    {
      errno = EBADF;
      return NULL;
    }

  stream = __newstream ();
  if (stream == NULL)
    return NULL;

  stream->__cookie = d;
  stream->__mode = m;

  return stream;
}