1: /* Copyright (C) 1991,1992,1994,1995,1997,2007 Free Software Foundation, Inc.
    2: 
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include <hurd.h>
   21: 
   22: /* This is initialized in dtable.c when that gets linked in.
   23:    If dtable.c is not linked in, it will be zero.  */
   24: static file_t (*_default_hurd_getdport_fn) (int fd) = 0;
   25: weak_alias (_default_hurd_getdport_fn, _hurd_getdport_fn)
   26: 
   27: file_t
   28: __getdport (int fd)
   29: {
   30:   if (_hurd_getdport_fn)
   31:     /* dtable.c has defined the function to fetch a port from the real file
   32:        descriptor table.  */
   33:     return (*_hurd_getdport_fn) (fd);
   34: 
   35:   /* getdport is the only use of file descriptors,
   36:      so we don't bother allocating a real table.  */
   37: 
   38:   if (_hurd_init_dtable == NULL)
   39:     {
   40:       /* Never had a descriptor table.  */
   41:       errno = EBADF;
   42:       return MACH_PORT_NULL;
   43:     }
   44: 
   45:   if (fd < 0 || (unsigned int) fd > _hurd_init_dtablesize ||
   46:       _hurd_init_dtable[fd] == MACH_PORT_NULL)
   47:     {
   48:       errno = EBADF;
   49:       return MACH_PORT_NULL;
   50:     }
   51:   else
   52:     {
   53:       __mach_port_mod_refs (__mach_task_self (), _hurd_init_dtable[fd],
   54:                             MACH_PORT_RIGHT_SEND, 1);
   55:       return _hurd_init_dtable[fd];
   56:     }
   57: }
   58: 
   59: weak_alias (__getdport, getdport)