44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <hurd.h>
|
|
|
|
/* Open a file descriptor on a port. */
|
|
|
|
int
|
|
openport (io_t port)
|
|
{
|
|
int fd;
|
|
|
|
/* Give the port a new user reference.
|
|
This is a good way to check that it is valid. */
|
|
if (__mach_port_mod_refs (__mach_task_self (), port,
|
|
MACH_PORT_RIGHT_SEND, 1))
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
fd = _hurd_dalloc (port, 0);
|
|
if (fd < 0)
|
|
/* The descriptor table is full. */
|
|
__mach_port_deallocate (__mach_task_self (), port);
|
|
|
|
return fd;
|
|
}
|