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[glibc.git] / hurd / getdport.c
blobb58832dbe4b5ed27973137dea66318ae258c5294
1 /* Copyright (C) 1991, 1992, 1994, 1995, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <hurd.h>
21 /* This is initialized in dtable.c when that gets linked in.
22 If dtable.c is not linked in, it will be zero. */
23 static file_t (*_default_hurd_getdport_fn) (int fd) = 0;
24 weak_alias (_default_hurd_getdport_fn, _hurd_getdport_fn)
26 file_t
27 __getdport (int fd)
29 if (_hurd_getdport_fn)
30 /* dtable.c has defined the function to fetch a port from the real file
31 descriptor table. */
32 return (*_hurd_getdport_fn) (fd);
34 /* getdport is the only use of file descriptors,
35 so we don't bother allocating a real table. */
37 if (_hurd_init_dtable == NULL)
38 /* Never had a descriptor table. */
39 return EBADF;
41 if (fd < 0 || (unsigned int) fd > _hurd_init_dtablesize ||
42 _hurd_init_dtable[fd] == MACH_PORT_NULL)
44 errno = EBADF;
45 return MACH_PORT_NULL;
47 else
49 __mach_port_mod_refs (__mach_task_self (), _hurd_init_dtable[fd],
50 MACH_PORT_RIGHT_SEND, 1);
51 return _hurd_init_dtable[fd];
55 weak_alias (__getdport, getdport)