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glibc  2.9
intern-fd.c
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00001 /* Copyright (C) 1994, 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.h>
00020 #include <hurd/fd.h>
00021 
00022 /* Allocate a new file descriptor and install PORT in it.  FLAGS are as for
00023    `open'; only O_IGNORE_CTTY is meaningful.
00024 
00025    If the descriptor table is full, set errno, and return -1.
00026    If DEALLOC is nonzero, deallocate PORT first.  */
00027 int
00028 _hurd_intern_fd (io_t port, int flags, int dealloc)
00029 {
00030   int fd;
00031   struct hurd_fd *d;
00032 
00033   HURD_CRITICAL_BEGIN;
00034   d = _hurd_alloc_fd (&fd, 0);
00035   if (d != NULL)
00036     {
00037       _hurd_port2fd (d, port, flags);
00038       __spin_unlock (&d->port.lock);
00039     }
00040   HURD_CRITICAL_END;
00041 
00042   if (d == NULL)
00043     {
00044       if (dealloc)
00045        __mach_port_deallocate (__mach_task_self (), port);
00046       return -1;
00047     }
00048 
00049   return fd;
00050 }