hurd/intern-fd.c

   1 /* Copyright (C) 1994-2016 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <hurd.h>
  19 #include <hurd/fd.h>
  20
  21 /* Allocate a new file descriptor and install PORT in it.  FLAGS are as for
  22    `open'; only O_IGNORE_CTTY and O_CLOEXEC are meaningful.
  23
  24    If the descriptor table is full, set errno, and return -1.
  25    If DEALLOC is nonzero, deallocate PORT first.  */
  26 int
  27 _hurd_intern_fd (io_t port, int flags, int dealloc)
  28 {
  29   int fd;
  30   struct hurd_fd *d;
  31
  32   HURD_CRITICAL_BEGIN;
  33   d = _hurd_alloc_fd (&fd, 0);
  34   if (d != NULL)
  35     {
  36       _hurd_port2fd (d, port, flags);
  37       __spin_unlock (&d->port.lock);
  38     }
  39   HURD_CRITICAL_END;
  40
  41   if (d == NULL)
  42     {
  43       if (dealloc)
  44         __mach_port_deallocate (__mach_task_self (), port);
  45       return -1;
  46     }
  47
  48   return fd;
  49 }