sysdeps/mach/hurd/fdopen.c

   1 /* Copyright (C) 1991, 1994, 1995, 1997, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <hurd/fd.h>
  22 #include <fcntl.h>
  23 #include <hurd/io.h>
  24
  25 /* Defined in fopen.c.  */
  26 extern int __getmode (const char *mode, __io_mode *mptr);
  27
  28 /* Open a new stream on a given system file descriptor.  */
  29 FILE *
  30 __fdopen (fd, mode)
  31      int fd;
  32      const char *mode;
  33 {
  34   FILE *stream;
  35   __io_mode m;
  36   struct hurd_fd *d;
  37   error_t err;
  38   int openmodes;
  39
  40   if (!__getmode (mode, &m))
  41     return NULL;
  42
  43   HURD_CRITICAL_BEGIN;
  44   d = _hurd_fd_get (fd);
  45   if (d == NULL)
  46     err = EBADF;
  47   else
  48     err = HURD_FD_PORT_USE (d, __io_get_openmodes (port, &openmodes));
  49   HURD_CRITICAL_END;
  50
  51   if (err)
  52     return __hurd_dfail (fd, err), NULL;
  53
  54   /* Check the access mode.  */
  55   if ((m.__read && !(openmodes & O_READ)) ||
  56       (m.__write && !(openmodes & O_WRITE)))
  57     {
  58       errno = EBADF;
  59       return NULL;
  60     }
  61
  62   stream = __newstream ();
  63   if (stream == NULL)
  64     return NULL;
  65
  66   stream->__cookie = d;
  67   stream->__mode = m;
  68
  69   return stream;
  70 }
  71
  72 weak_alias (__fdopen, fdopen)