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332 lines
8.3 KiB
C
332 lines
8.3 KiB
C
/* ioctl commands which must be done in the C library.
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Copyright (C) 1994-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <hurd.h>
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#include <hurd/fd.h>
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#include <sys/ioctl.h>
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#include <hurd/ioctl.h>
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#include <string.h>
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/* Symbol set of ioctl handler lists. If there are user-registered
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handlers, one of these lists will contain them. The other lists are
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handlers built into the library. */
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symbol_set_define (_hurd_ioctl_handler_lists)
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/* Look up REQUEST in the set of handlers. */
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ioctl_handler_t
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_hurd_lookup_ioctl_handler (int request)
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{
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void *const *ptr;
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const struct ioctl_handler *h;
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/* Mask off the type bits, so that we see requests in a single group as a
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contiguous block of values. */
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request = _IOC_NOTYPE (request);
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for (ptr = symbol_set_first_element (_hurd_ioctl_handler_lists);
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!symbol_set_end_p (_hurd_ioctl_handler_lists, ptr);
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++ptr)
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for (h = *ptr; h != NULL; h = h->next)
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if (request >= h->first_request && request <= h->last_request)
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return h->handler;
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return NULL;
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}
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#include <fcntl.h>
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/* Find out how many bytes may be read from FD without blocking. */
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static int
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fioctl (int fd,
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int request,
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int *arg)
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{
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error_t err;
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*(volatile int *) arg = *arg;
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switch (request)
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{
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default:
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err = ENOTTY;
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break;
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case FIONREAD:
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{
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vm_size_t navail;
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err = HURD_DPORT_USE (fd, __io_readable (port, &navail));
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if (!err)
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*arg = (int) navail;
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}
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break;
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case FIONBIO:
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err = HURD_DPORT_USE (fd, (*arg
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? __io_set_some_openmodes
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: __io_clear_some_openmodes)
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(port, O_NONBLOCK));
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break;
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case FIOASYNC:
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err = HURD_DPORT_USE (fd, (*arg
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? __io_set_some_openmodes
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: __io_clear_some_openmodes)
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(port, O_ASYNC));
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break;
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case FIOSETOWN:
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err = HURD_DPORT_USE (fd, __io_mod_owner (port, *arg));
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break;
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case FIOGETOWN:
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err = HURD_DPORT_USE (fd, __io_get_owner (port, arg));
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break;
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}
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return err ? __hurd_dfail (fd, err) : 0;
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}
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_HURD_HANDLE_IOCTLS (fioctl, FIOGETOWN, FIONREAD);
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static int
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fioclex (int fd,
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int request)
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{
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int flag;
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switch (request)
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{
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default:
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return __hurd_fail (ENOTTY);
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case FIOCLEX:
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flag = FD_CLOEXEC;
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break;
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case FIONCLEX:
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flag = 0;
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break;
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}
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return __fcntl (fd, F_SETFD, flag);
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}
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_HURD_HANDLE_IOCTLS (fioclex, FIOCLEX, FIONCLEX);
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#include <hurd/term.h>
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#include <hurd/tioctl.h>
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/* Install a new CTTYID port, atomically updating the dtable appropriately.
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This consumes the send right passed in. */
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void
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_hurd_locked_install_cttyid (mach_port_t cttyid)
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{
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mach_port_t old;
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struct hurd_port *const port = &_hurd_ports[INIT_PORT_CTTYID];
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struct hurd_userlink ulink;
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int i;
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/* Install the new cttyid port, and preserve it with a ulink.
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We unroll the _hurd_port_set + _hurd_port_get here so that
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there is no window where the cell is unlocked and CTTYID could
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be changed by another thread. (We also delay the deallocation
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of the old port until the end, to minimize the duration of the
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critical section.)
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It is important that changing the cttyid port is only ever done by
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holding the dtable lock continuously while updating the port cell and
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re-ctty'ing the dtable; dtable.c assumes we do this. Otherwise, the
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pgrp-change notification code in dtable.c has to worry about racing
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against us here in odd situations. The one exception to this is
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setsid, which holds the dtable lock while changing the pgrp and
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clearing the cttyid port, and then unlocks the dtable lock to allow
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*/
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__spin_lock (&port->lock);
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old = _hurd_userlink_clear (&port->users) ? port->port : MACH_PORT_NULL;
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port->port = cttyid;
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cttyid = _hurd_port_locked_get (port, &ulink);
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for (i = 0; i < _hurd_dtablesize; ++i)
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{
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struct hurd_fd *const d = _hurd_dtable[i];
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mach_port_t newctty = MACH_PORT_NULL;
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if (d == NULL)
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/* Nothing to do for an unused descriptor cell. */
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continue;
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if (cttyid != MACH_PORT_NULL)
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/* We do have some controlling tty. */
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HURD_PORT_USE (&d->port,
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({ mach_port_t id;
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/* Get the io object's cttyid port. */
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if (! __term_getctty (port, &id))
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{
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if (id == cttyid /* Is it ours? */
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/* Get the ctty io port. */
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&& __term_open_ctty (port,
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_hurd_pid, _hurd_pgrp,
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&newctty))
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/* XXX it is our ctty but the call failed? */
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newctty = MACH_PORT_NULL;
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__mach_port_deallocate (__mach_task_self (), id);
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}
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0;
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}));
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/* Install the new ctty port. */
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_hurd_port_set (&d->ctty, newctty);
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}
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__mutex_unlock (&_hurd_dtable_lock);
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if (old != MACH_PORT_NULL)
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__mach_port_deallocate (__mach_task_self (), old);
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_hurd_port_free (port, &ulink, cttyid);
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}
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static void
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install_ctty (mach_port_t cttyid)
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{
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&_hurd_dtable_lock);
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_hurd_locked_install_cttyid (cttyid);
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HURD_CRITICAL_END;
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}
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/* Called when we have received a message saying to use a new ctty ID port. */
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error_t
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_hurd_setcttyid (mach_port_t cttyid)
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{
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error_t err;
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if (cttyid != MACH_PORT_NULL)
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{
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/* Give the new send right a user reference.
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This is a good way to check that it is valid. */
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if (err = __mach_port_mod_refs (__mach_task_self (), cttyid,
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MACH_PORT_RIGHT_SEND, 1))
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return err;
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}
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/* Install the port, consuming the reference we just created. */
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install_ctty (cttyid);
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return 0;
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}
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static inline error_t
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do_tiocsctty (io_t port, io_t ctty)
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{
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mach_port_t cttyid;
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error_t err;
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if (ctty != MACH_PORT_NULL)
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/* PORT is already the ctty. Nothing to do. */
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return 0;
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/* Get PORT's cttyid port. */
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err = __term_getctty (port, &cttyid);
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if (err)
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return err;
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/* Change the terminal's pgrp to ours. */
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err = __tioctl_tiocspgrp (port, _hurd_pgrp);
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if (err)
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__mach_port_deallocate (__mach_task_self (), cttyid);
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else
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/* Make it our own. */
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install_ctty (cttyid);
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return err;
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}
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/* Make FD be the controlling terminal.
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This function is called for `ioctl (fd, TCIOSCTTY)'. */
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static int
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tiocsctty (int fd,
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int request) /* Always TIOCSCTTY. */
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{
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return __hurd_fail (HURD_DPORT_USE (fd, do_tiocsctty (port, ctty)));
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}
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_HURD_HANDLE_IOCTL (tiocsctty, TIOCSCTTY);
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/* Dissociate from the controlling terminal. */
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static int
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tiocnotty (int fd,
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int request) /* Always TIOCNOTTY. */
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{
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mach_port_t fd_cttyid;
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error_t err;
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if (err = HURD_DPORT_USE (fd, __term_getctty (port, &fd_cttyid)))
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return __hurd_fail (err);
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if (__USEPORT (CTTYID, port != fd_cttyid))
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err = EINVAL;
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__mach_port_deallocate (__mach_task_self (), fd_cttyid);
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if (err)
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return __hurd_fail (err);
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/* Clear our cttyid port. */
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install_ctty (MACH_PORT_NULL);
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return 0;
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}
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_HURD_HANDLE_IOCTL (tiocnotty, TIOCNOTTY);
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#include <hurd/pfinet.h>
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#include <net/if.h>
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#include <netinet/in.h>
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/* Fill in the buffer IFC->IFC_BUF of length IFC->IFC_LEN with a list
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of ifr structures, one for each network interface. */
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static int
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siocgifconf (int fd, int request, struct ifconf *ifc)
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{
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error_t err;
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mach_msg_type_number_t data_len = ifc->ifc_len;
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char *data = ifc->ifc_buf;
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if (data_len <= 0)
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return 0;
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err = HURD_DPORT_USE (fd, __pfinet_siocgifconf (port, ifc->ifc_len,
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&data, &data_len));
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if (data_len < ifc->ifc_len)
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ifc->ifc_len = data_len;
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if (data != ifc->ifc_buf)
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{
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memcpy (ifc->ifc_buf, data, ifc->ifc_len);
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__vm_deallocate (__mach_task_self (), (vm_address_t) data, data_len);
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}
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return err ? __hurd_dfail (fd, err) : 0;
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}
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_HURD_HANDLE_IOCTL (siocgifconf, SIOCGIFCONF);
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