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glibc  2.9
fd-close.c
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00001 /* Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <hurd/fd.h>
00020 
00021 error_t
00022 _hurd_fd_close (struct hurd_fd *fd)
00023 {
00024   error_t err;
00025 
00026   HURD_CRITICAL_BEGIN;
00027 
00028   __spin_lock (&fd->port.lock);
00029   if (fd->port.port == MACH_PORT_NULL)
00030     {
00031       __spin_unlock (&fd->port.lock);
00032       err = EBADF;
00033     }
00034   else
00035     {
00036       /* Clear the descriptor's port cells.
00037         This deallocates the ports if noone else is still using them.  */
00038       _hurd_port_set (&fd->ctty, MACH_PORT_NULL);
00039       _hurd_port_locked_set (&fd->port, MACH_PORT_NULL);
00040       err = 0;
00041     }
00042 
00043   HURD_CRITICAL_END;
00044 
00045   return err;
00046 }