glibc/hurd/hurdioctl.c
1995-02-18 01:27:10 +00:00

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6.2 KiB
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/* ioctl commands which must be done in the C library.
Copyright (C) 1994, 1995 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>
#include <hurd/fd.h>
#include <sys/ioctl.h>
#include <hurd/ioctl.h>
/* Symbol set of ioctl handler lists. If there are user-registered
handlers, one of these lists will contain them. The other lists are
handlers built into the library. */
symbol_set_define (_hurd_ioctl_handler_lists)
/* Look up REQUEST in the set of handlers. */
ioctl_handler_t
_hurd_lookup_ioctl_handler (int request)
{
void *const *ptr;
const struct ioctl_handler *h;
for (ptr = symbol_set_first_element (_hurd_ioctl_handler_lists);
!symbol_set_end_p (_hurd_ioctl_handler_lists, ptr);
++ptr)
for (h = *ptr; h != NULL; h = h->next)
if (request >= h->first_request && request <= h->last_request)
return h->handler;
return NULL;
}
#include <fcntl.h>
/* Find out how many bytes may be read from FD without blocking. */
static int
fioctl (int fd,
int request,
int *arg)
{
error_t err;
*(volatile int *) arg = *arg;
switch (request)
{
default:
err = EGRATUITOUS;
break;
case FIONREAD:
{
mach_msg_type_number_t navail;
err = HURD_DPORT_USE (fd, __io_readable (port, &navail));
if (!err)
*arg = (int) navail;
}
break;
case FIONBIO:
err = HURD_DPORT_USE (fd, (*arg ?
__io_set_some_openmodes :
__io_clear_some_openmodes)
(port, O_NONBLOCK));
break;
case FIOASYNC:
err = HURD_DPORT_USE (fd, (*arg ?
__io_set_some_openmodes :
__io_clear_some_openmodes)
(port, O_ASYNC));
break;
case FIOSETOWN:
err = HURD_DPORT_USE (fd, __io_mod_owner (port, *arg));
break;
case FIOGETOWN:
err = HURD_DPORT_USE (fd, __io_get_owner (port, arg));
break;
}
return err ? __hurd_fail (err) : 0;
}
_HURD_HANDLE_IOCTLS (fioctl, FIOGETOWN, FIONREAD);
static int
fioclex (int fd,
int request)
{
int flag;
switch (request)
{
default:
return __hurd_fail (EGRATUITOUS);
case FIOCLEX:
flag = FD_CLOEXEC;
break;
case FIONCLEX:
flag = 0;
break;
}
return __fcntl (fd, F_SETFD, flag);
}
_HURD_HANDLE_IOCTLS (fioclex, FIOCLEX, FIONCLEX);
#include <hurd/term.h>
static void
rectty_dtable (mach_port_t cttyid)
{
int i;
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_dtable_lock);
for (i = 0; i < _hurd_dtablesize; ++i)
{
struct hurd_fd *const d = _hurd_dtable[i];
mach_port_t newctty;
if (d == NULL)
/* Nothing to do for an unused descriptor cell. */
continue;
if (cttyid == MACH_PORT_NULL)
/* We now have no controlling tty at all. */
newctty = MACH_PORT_NULL;
else
HURD_PORT_USE (&d->port,
({ mach_port_t id;
/* Get the io object's cttyid port. */
if (! __term_getctty (port, &id))
{
if (id == cttyid && /* Is it ours? */
/* Get the ctty io port. */
__term_open_ctty (port,
_hurd_pid, _hurd_pgrp,
&newctty))
/* XXX it is our ctty but the call failed? */
newctty = MACH_PORT_NULL;
__mach_port_deallocate
(__mach_task_self (), (mach_port_t) id);
}
else
newctty = MACH_PORT_NULL;
0;
}));
/* Install the new ctty port. */
_hurd_port_set (&d->ctty, newctty);
}
__mutex_unlock (&_hurd_dtable_lock);
HURD_CRITICAL_END;
}
/* Called when we have received a message saying to use a new ctty ID port. */
error_t
_hurd_setcttyid (mach_port_t cttyid)
{
error_t err;
if (cttyid != MACH_PORT_NULL)
{
/* Give the new send right a user reference.
This is a good way to check that it is valid. */
if (err = __mach_port_mod_refs (__mach_task_self (), cttyid,
MACH_PORT_RIGHT_SEND, 1))
return err;
}
/* Install the port, consuming the reference we just created. */
_hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid);
/* Reset all the ctty ports in all the descriptors. */
__USEPORT (CTTYID, (rectty_dtable (cttyid), 0));
return 0;
}
/* Make FD be the controlling terminal.
This function is called for `ioctl (fd, TCIOSCTTY)'. */
static int
tiocsctty (int fd,
int request) /* Always TIOCSCTTY. */
{
mach_port_t cttyid;
error_t err;
/* Get FD's cttyid port, unless it is already ours. */
err = HURD_DPORT_USE (fd, ctty != MACH_PORT_NULL ? EADDRINUSE :
__term_getctty (port, &cttyid));
if (err == EADDRINUSE)
/* FD is already the ctty. Nothing to do. */
return 0;
else if (err)
return __hurd_fail (err);
/* Make it our own. */
_hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], cttyid);
/* Reset all the ctty ports in all the descriptors. */
__USEPORT (CTTYID, (rectty_dtable (cttyid), 0));
return 0;
}
_HURD_HANDLE_IOCTL (tiocsctty, TIOCSCTTY);
/* Dissociate from the controlling terminal. */
static int
tiocnotty (int fd,
int request) /* Always TIOCNOTTY. */
{
mach_port_t fd_cttyid;
error_t err;
if (err = HURD_DPORT_USE (fd, __term_getctty (port, &fd_cttyid)))
return __hurd_fail (err);
if (__USEPORT (CTTYID, port != fd_cttyid))
err = EINVAL;
__mach_port_deallocate (__mach_task_self (), fd_cttyid);
if (err)
return __hurd_fail (err);
/* Clear our cttyid port cell. */
_hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], MACH_PORT_NULL);
/* Reset all the ctty ports in all the descriptors. */
__USEPORT (CTTYID, (rectty_dtable (MACH_PORT_NULL), 0));
return 0;
}
_HURD_HANDLE_IOCTL (tiocnotty, TIOCNOTTY);