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glibc  2.9
getdport.c
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00001 /* Copyright (C) 1991,1992,1994,1995,1997,2007 Free Software Foundation, Inc.
00002 
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <hurd.h>
00021 
00022 /* This is initialized in dtable.c when that gets linked in.
00023    If dtable.c is not linked in, it will be zero.  */
00024 static file_t (*_default_hurd_getdport_fn) (int fd) = 0;
00025 weak_alias (_default_hurd_getdport_fn, _hurd_getdport_fn)
00026 
00027 file_t
00028 __getdport (int fd)
00029 {
00030   if (_hurd_getdport_fn)
00031     /* dtable.c has defined the function to fetch a port from the real file
00032        descriptor table.  */
00033     return (*_hurd_getdport_fn) (fd);
00034 
00035   /* getdport is the only use of file descriptors,
00036      so we don't bother allocating a real table.  */
00037 
00038   if (_hurd_init_dtable == NULL)
00039     {
00040       /* Never had a descriptor table.  */
00041       errno = EBADF;
00042       return MACH_PORT_NULL;
00043     }
00044 
00045   if (fd < 0 || (unsigned int) fd > _hurd_init_dtablesize ||
00046       _hurd_init_dtable[fd] == MACH_PORT_NULL)
00047     {
00048       errno = EBADF;
00049       return MACH_PORT_NULL;
00050     }
00051   else
00052     {
00053       __mach_port_mod_refs (__mach_task_self (), _hurd_init_dtable[fd],
00054                          MACH_PORT_RIGHT_SEND, 1);
00055       return _hurd_init_dtable[fd];
00056     }
00057 }
00058 
00059 weak_alias (__getdport, getdport)