hurd/intern-fd.c

   1 /* Copyright (C) 1994, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <hurd.h>
  20 #include <hurd/fd.h>
  21
  22 /* Allocate a new file descriptor and install PORT in it.  FLAGS are as for
  23    `open'; only O_IGNORE_CTTY is meaningful.
  24
  25    If the descriptor table is full, set errno, and return -1.
  26    If DEALLOC is nonzero, deallocate PORT first.  */
  27 int
  28 _hurd_intern_fd (io_t port, int flags, int dealloc)
  29 {
  30   int fd;
  31   struct hurd_fd *d;
  32
  33   HURD_CRITICAL_BEGIN;
  34   d = _hurd_alloc_fd (&fd, 0);
  35   if (d != NULL)
  36     {
  37       _hurd_port2fd (d, port, flags);
  38       __spin_unlock (&d->port.lock);
  39     }
  40   HURD_CRITICAL_END;
  41
  42   if (d == NULL)
  43     {
  44       if (dealloc)
  45         __mach_port_deallocate (__mach_task_self (), port);
  46       return -1;
  47     }
  48
  49   return fd;
  50 }