mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
332 lines
8.3 KiB
C
332 lines
8.3 KiB
C
/* ioctl commands which must be done in the C library.
|
||
Copyright (C) 1994-2023 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 Lesser General Public
|
||
License as published by the Free Software Foundation; either
|
||
version 2.1 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
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with the GNU C Library; if not, see
|
||
<https://www.gnu.org/licenses/>. */
|
||
|
||
#include <hurd.h>
|
||
#include <hurd/fd.h>
|
||
#include <sys/ioctl.h>
|
||
#include <hurd/ioctl.h>
|
||
#include <string.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;
|
||
|
||
/* Mask off the type bits, so that we see requests in a single group as a
|
||
contiguous block of values. */
|
||
request = _IOC_NOTYPE (request);
|
||
|
||
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 = ENOTTY;
|
||
break;
|
||
|
||
case FIONREAD:
|
||
{
|
||
vm_size_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_dfail (fd, err) : 0;
|
||
}
|
||
|
||
_HURD_HANDLE_IOCTLS (fioctl, FIOGETOWN, FIONREAD);
|
||
|
||
|
||
static int
|
||
fioclex (int fd,
|
||
int request)
|
||
{
|
||
int flag;
|
||
|
||
switch (request)
|
||
{
|
||
default:
|
||
return __hurd_fail (ENOTTY);
|
||
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>
|
||
#include <hurd/tioctl.h>
|
||
|
||
/* Install a new CTTYID port, atomically updating the dtable appropriately.
|
||
This consumes the send right passed in. */
|
||
|
||
void
|
||
_hurd_locked_install_cttyid (mach_port_t cttyid)
|
||
{
|
||
mach_port_t old;
|
||
struct hurd_port *const port = &_hurd_ports[INIT_PORT_CTTYID];
|
||
struct hurd_userlink ulink;
|
||
int i;
|
||
|
||
/* Install the new cttyid port, and preserve it with a ulink.
|
||
We unroll the _hurd_port_set + _hurd_port_get here so that
|
||
there is no window where the cell is unlocked and CTTYID could
|
||
be changed by another thread. (We also delay the deallocation
|
||
of the old port until the end, to minimize the duration of the
|
||
critical section.)
|
||
|
||
It is important that changing the cttyid port is only ever done by
|
||
holding the dtable lock continuously while updating the port cell and
|
||
re-ctty'ing the dtable; dtable.c assumes we do this. Otherwise, the
|
||
pgrp-change notification code in dtable.c has to worry about racing
|
||
against us here in odd situations. The one exception to this is
|
||
setsid, which holds the dtable lock while changing the pgrp and
|
||
clearing the cttyid port, and then unlocks the dtable lock to allow
|
||
|
||
|
||
*/
|
||
|
||
__spin_lock (&port->lock);
|
||
old = _hurd_userlink_clear (&port->users) ? port->port : MACH_PORT_NULL;
|
||
port->port = cttyid;
|
||
cttyid = _hurd_port_locked_get (port, &ulink);
|
||
|
||
for (i = 0; i < _hurd_dtablesize; ++i)
|
||
{
|
||
struct hurd_fd *const d = _hurd_dtable[i];
|
||
mach_port_t newctty = MACH_PORT_NULL;
|
||
|
||
if (d == NULL)
|
||
/* Nothing to do for an unused descriptor cell. */
|
||
continue;
|
||
|
||
if (cttyid != MACH_PORT_NULL)
|
||
/* We do have some controlling tty. */
|
||
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 (), id);
|
||
}
|
||
0;
|
||
}));
|
||
|
||
/* Install the new ctty port. */
|
||
_hurd_port_set (&d->ctty, newctty);
|
||
}
|
||
|
||
__mutex_unlock (&_hurd_dtable_lock);
|
||
|
||
if (old != MACH_PORT_NULL)
|
||
__mach_port_deallocate (__mach_task_self (), old);
|
||
_hurd_port_free (port, &ulink, cttyid);
|
||
}
|
||
|
||
static void
|
||
install_ctty (mach_port_t cttyid)
|
||
{
|
||
HURD_CRITICAL_BEGIN;
|
||
__mutex_lock (&_hurd_dtable_lock);
|
||
_hurd_locked_install_cttyid (cttyid);
|
||
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. */
|
||
install_ctty (cttyid);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
static inline error_t
|
||
do_tiocsctty (io_t port, io_t ctty)
|
||
{
|
||
mach_port_t cttyid;
|
||
error_t err;
|
||
|
||
if (ctty != MACH_PORT_NULL)
|
||
/* PORT is already the ctty. Nothing to do. */
|
||
return 0;
|
||
|
||
/* Get PORT's cttyid port. */
|
||
err = __term_getctty (port, &cttyid);
|
||
if (err)
|
||
return err;
|
||
|
||
/* Change the terminal's pgrp to ours. */
|
||
err = __tioctl_tiocspgrp (port, _hurd_pgrp);
|
||
if (err)
|
||
__mach_port_deallocate (__mach_task_self (), cttyid);
|
||
else
|
||
/* Make it our own. */
|
||
install_ctty (cttyid);
|
||
|
||
return err;
|
||
}
|
||
|
||
/* Make FD be the controlling terminal.
|
||
This function is called for `ioctl (fd, TCIOSCTTY)'. */
|
||
|
||
static int
|
||
tiocsctty (int fd,
|
||
int request) /* Always TIOCSCTTY. */
|
||
{
|
||
return __hurd_fail (HURD_DPORT_USE (fd, do_tiocsctty (port, ctty)));
|
||
}
|
||
_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. */
|
||
install_ctty (MACH_PORT_NULL);
|
||
|
||
return 0;
|
||
}
|
||
_HURD_HANDLE_IOCTL (tiocnotty, TIOCNOTTY);
|
||
|
||
#include <hurd/pfinet.h>
|
||
#include <net/if.h>
|
||
#include <netinet/in.h>
|
||
|
||
/* Fill in the buffer IFC->IFC_BUF of length IFC->IFC_LEN with a list
|
||
of ifr structures, one for each network interface. */
|
||
static int
|
||
siocgifconf (int fd, int request, struct ifconf *ifc)
|
||
{
|
||
error_t err;
|
||
size_t data_len = ifc->ifc_len;
|
||
char *data = ifc->ifc_buf;
|
||
|
||
if (data_len <= 0)
|
||
return 0;
|
||
|
||
err = HURD_DPORT_USE (fd, __pfinet_siocgifconf (port, ifc->ifc_len,
|
||
&data, &data_len));
|
||
if (data_len < ifc->ifc_len)
|
||
ifc->ifc_len = data_len;
|
||
if (data != ifc->ifc_buf)
|
||
{
|
||
memcpy (ifc->ifc_buf, data, ifc->ifc_len);
|
||
__vm_deallocate (__mach_task_self (), (vm_address_t) data, data_len);
|
||
}
|
||
return err ? __hurd_dfail (fd, err) : 0;
|
||
}
|
||
_HURD_HANDLE_IOCTL (siocgifconf, SIOCGIFCONF);
|