hurd/port2fd.c

   1 /* Copyright (C) 1994-2017 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 #include <hurd/signal.h>
  21 #include <hurd/term.h>
  22 #include <fcntl.h>
  23
  24 /* Store PORT in file descriptor D, doing appropriate ctty magic.
  25    FLAGS are as for `open'; only O_IGNORE_CTTY and O_CLOEXEC are meaningful.
  26    D should be locked, and will not be unlocked.  */
  27
  28 void
  29 _hurd_port2fd (struct hurd_fd *d, io_t dport, int flags)
  30 {
  31   mach_port_t cttyid;
  32   io_t ctty = MACH_PORT_NULL;
  33
  34   if (!(flags & O_IGNORE_CTTY))
  35     __USEPORT (CTTYID,
  36                ({
  37                  if (port != MACH_PORT_NULL && /* Do we have a ctty? */
  38                      ! __term_getctty (dport, &cttyid)) /* Could this be it? */
  39                    {
  40                      __mach_port_deallocate (__mach_task_self (), cttyid);
  41                      /* This port is capable of being a controlling tty.
  42                         Is it ours?  */
  43                      if (cttyid == port)
  44                        __term_open_ctty (dport, _hurd_pid, _hurd_pgrp, &ctty);
  45                      /* XXX if this port is our ctty, but we are not doing
  46                         ctty style i/o because term_become_ctty barfed,
  47                         what to do?  */
  48                    }
  49                  0;
  50                }));
  51
  52   /* Install PORT in the descriptor cell, leaving it locked.  */
  53   {
  54     mach_port_t old
  55       = _hurd_userlink_clear (&d->port.users) ? d->port.port : MACH_PORT_NULL;
  56     d->port.port = dport;
  57     d->flags = (flags & O_CLOEXEC) ? FD_CLOEXEC : 0;
  58     if (old != MACH_PORT_NULL)
  59       __mach_port_deallocate (__mach_task_self (), old);
  60   }
  61
  62   _hurd_port_set (&d->ctty, ctty);
  63 }