712 lines
20 KiB
C
712 lines
20 KiB
C
/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* (tty_compat.c)
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* The compatible layer which interacts with process management core (lwp)
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*
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* Change Logs:
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* Date Author Notes
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* 2023-11-13 Shell init ver.
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*/
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#define DBG_TAG "lwp.tty"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#include "../tty_config.h"
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#include "../tty_internal.h"
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#include "../terminal.h"
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1994-1995 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* is the tty and session leader already binding ? */
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static rt_bool_t _is_already_binding(lwp_tty_t tp, rt_lwp_t p)
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{
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rt_bool_t rc;
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rt_processgroup_t pgrp = p->pgrp;
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/* lwp is already locked */
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RT_ASSERT(pgrp);
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/* Note: pgrp->session is constant after process group is created */
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if (tp->t_session && tp->t_session == pgrp->session)
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{
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rc = RT_TRUE;
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}
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else
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{
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rc = RT_FALSE;
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}
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return rc;
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}
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static rt_bool_t _is_tty_or_sess_busy(lwp_tty_t tp, rt_lwp_t p)
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{
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rt_bool_t rc;
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rt_session_t sess = p->pgrp->session;
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SESS_LOCK(sess);
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if (sess->ctty)
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{
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rc = RT_TRUE;
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}
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else if (tp->t_session)
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{
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/**
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* TODO: allow TTY stolen if the sess leader is killed while resource
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* had not been collected
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*/
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if (tp->t_session->leader == RT_NULL)
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rc = RT_FALSE;
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else
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rc = RT_TRUE;
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}
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else
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{
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rc = RT_FALSE;
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}
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SESS_UNLOCK(sess);
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return rc;
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}
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int lwp_tty_bg_stop(struct lwp_tty *tp, struct rt_condvar *cv)
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{
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int error;
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int revokecnt = tp->t_revokecnt;
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rt_lwp_t self_lwp;
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rt_thread_t header_thr;
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rt_thread_t cur_thr = rt_thread_self();
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int jobctl_stopped;
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self_lwp = cur_thr->lwp;
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RT_ASSERT(self_lwp);
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jobctl_stopped = self_lwp->jobctl_stopped;
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tty_lock_assert(tp, MA_OWNED | MA_NOTRECURSED);
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MPASS(!tty_gone(tp));
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LWP_LOCK(self_lwp);
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header_thr = rt_list_entry(self_lwp->t_grp.prev, struct rt_thread, sibling);
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if (!jobctl_stopped && header_thr == cur_thr &&
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cur_thr->sibling.prev == &self_lwp->t_grp)
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{
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/* update lwp status */
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jobctl_stopped = self_lwp->jobctl_stopped = RT_TRUE;
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}
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LWP_UNLOCK(self_lwp);
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error = cv_wait(cv, tp->t_mtx);
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if (jobctl_stopped)
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{
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self_lwp->jobctl_stopped = RT_FALSE;
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}
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/* Bail out when the device slipped away. */
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if (tty_gone(tp))
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return -ENXIO;
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/* Restart the system call when we may have been revoked. */
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if (tp->t_revokecnt != revokecnt)
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return -ERESTART;
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return error;
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}
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/* process management */
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int lwp_tty_set_ctrl_proc(lwp_tty_t tp, rt_thread_t td)
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{
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int rc = -1;
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struct rt_lwp *p = td->lwp;
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tty_unlock(tp);
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LWP_LOCK(p);
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tty_lock(tp);
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if (is_sess_leader(p))
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{
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if (_is_already_binding(tp, p))
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{
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rc = 0;
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}
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else if (_is_tty_or_sess_busy(tp, p))
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{
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rc = -EPERM;
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}
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else
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{
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/**
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* Binding controlling process
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* note: p->pgrp is protected by lwp lock;
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* pgrp->session is always constant.
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*/
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tp->t_session = p->pgrp->session;
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tp->t_session->ctty = tp;
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tp->t_sessioncnt++;
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/* Assign foreground process group */
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tp->t_pgrp = p->pgrp;
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p->term_ctrlterm = RT_TRUE;
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LOG_D("%s(sid=%d)", __func__, tp->t_session->sid);
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rc = 0;
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}
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}
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else
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{
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rc = -EPERM;
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}
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LWP_UNLOCK(p);
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return rc;
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}
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int lwp_tty_assign_foreground(lwp_tty_t tp, rt_thread_t td, int pgid)
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{
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struct rt_processgroup *pg;
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rt_lwp_t cur_lwp = td->lwp;
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tty_unlock(tp);
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pg = lwp_pgrp_find_and_inc_ref(pgid);
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if (pg == NULL || cur_lwp == NULL)
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{
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tty_lock(tp);
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return -EPERM;
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}
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else
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{
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PGRP_LOCK(pg);
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if (pg->sid != cur_lwp->sid)
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{
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PGRP_UNLOCK(pg);
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lwp_pgrp_dec_ref(pg);
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LOG_D("%s: NoPerm current process (pid=%d, pgid=%d, sid=%d), "
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"tagget group (pgid=%d, sid=%d)", __func__,
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cur_lwp->pid, cur_lwp->pgid, cur_lwp->sid, pgid, pg->sid);
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tty_lock(tp);
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return -EPERM;
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}
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}
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tty_lock(tp);
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/**
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* Determine if this TTY is the controlling TTY after
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* relocking the TTY.
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*/
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if (!tty_is_ctty(tp, td->lwp))
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{
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PGRP_UNLOCK(pg);
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LOG_D("%s: NoCTTY current process (pid=%d, pgid=%d, sid=%d), "
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"tagget group (pgid=%d, sid=%d)", __func__,
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cur_lwp->pid, cur_lwp->pgid, cur_lwp->sid, pgid, pg->sid);
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return -ENOTTY;
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}
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tp->t_pgrp = pg;
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PGRP_UNLOCK(pg);
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lwp_pgrp_dec_ref(pg);
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/* Wake up the background process groups. */
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cv_broadcast(&tp->t_bgwait);
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LOG_D("%s: Foreground group %p (pgid=%d)", __func__, tp->t_pgrp,
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tp->t_pgrp ? tp->t_pgrp->pgid : -1);
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return 0;
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}
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/**
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* Signalling processes.
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*/
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void lwp_tty_signal_sessleader(struct lwp_tty *tp, int sig)
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{
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struct rt_lwp *p;
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struct rt_session *s;
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tty_assert_locked(tp);
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MPASS(sig >= 1 && sig < _LWP_NSIG);
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/* Make signals start output again. */
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tp->t_flags &= ~TF_STOPPED;
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tp->t_termios.c_lflag &= ~FLUSHO;
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/**
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* Load s.leader exactly once to avoid race where s.leader is
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* set to NULL by a concurrent invocation of killjobc() by the
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* session leader. Note that we are not holding t_session's
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* lock for the read.
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*/
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if ((s = tp->t_session) != NULL &&
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(p = (void *)rt_atomic_load((rt_atomic_t *)&s->leader)) != NULL)
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{
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lwp_signal_kill(p, sig, SI_KERNEL, 0);
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}
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}
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void lwp_tty_signal_pgrp(struct lwp_tty *tp, int sig)
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{
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tty_assert_locked(tp);
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MPASS(sig >= 1 && sig < _LWP_NSIG);
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/* Make signals start output again. */
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tp->t_flags &= ~TF_STOPPED;
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tp->t_termios.c_lflag &= ~FLUSHO;
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#ifdef USING_BSD_SIGINFO
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if (sig == SIGINFO && !(tp->t_termios.c_lflag & NOKERNINFO))
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tty_info(tp);
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#endif /* USING_BSD_SIGINFO */
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if (tp->t_pgrp != NULL)
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{
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PGRP_LOCK(tp->t_pgrp);
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lwp_pgrp_signal_kill(tp->t_pgrp, sig, SI_KERNEL, 0);
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PGRP_UNLOCK(tp->t_pgrp);
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}
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}
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/* bsd_ttydev_methods.d_ioctl */
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rt_inline size_t _copy_to_user(void *to, void *from, size_t n)
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{
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return lwp_put_to_user(to, from, n) == n ? 0 : -EFAULT;
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}
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rt_inline size_t _copy_from_user(void *to, void *from, size_t n)
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{
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return lwp_get_from_user(to, from, n) == n ? 0 : -EFAULT;
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}
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static void termios_to_termio(struct termios *tios, struct termio *tio)
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{
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memset(tio, 0, sizeof(*tio));
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tio->c_iflag = tios->c_iflag;
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tio->c_oflag = tios->c_oflag;
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tio->c_cflag = tios->c_cflag;
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tio->c_lflag = tios->c_lflag;
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tio->c_line = tios->c_line;
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memcpy(tio->c_cc, tios->c_cc, NCC);
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}
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static void termio_to_termios(struct termio *tio, struct termios *tios)
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{
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int i;
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tios->c_iflag = tio->c_iflag;
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tios->c_oflag = tio->c_oflag;
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tios->c_cflag = tio->c_cflag;
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tios->c_lflag = tio->c_lflag;
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for (i = NCC; i < NCCS; i++)
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tios->c_cc[i] = _POSIX_VDISABLE;
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memcpy(tios->c_cc, tio->c_cc, NCC);
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}
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#define IOCTL(cmd, data, fflags, td) \
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bsd_ttydev_methods.d_ioctl(tp, cmd, data, fflags, td)
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int lwp_tty_ioctl_adapter(lwp_tty_t tp, int cmd, int oflags, void *args, rt_thread_t td)
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{
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long fflags = FFLAGS(oflags);
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struct termios tios;
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struct termio tio;
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int error;
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LOG_D("%s(cmd=0x%x, args=%p)", __func__, cmd, args);
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switch (cmd & 0xffff)
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{
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case TCGETS:
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error = IOCTL(TIOCGETA, (rt_caddr_t)&tios, fflags, td);
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if (error)
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break;
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error = _copy_to_user(args, &tios, sizeof(tios));
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break;
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case TCSETS:
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error = _copy_from_user(&tios, args, sizeof(tios));
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if (error)
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break;
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error = (IOCTL(TIOCSETA, (rt_caddr_t)&tios, fflags, td));
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break;
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case TCSETSW:
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error = _copy_from_user(&tios, args, sizeof(tios));
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if (error)
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break;
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error = (IOCTL(TIOCSETAW, (rt_caddr_t)&tios, fflags, td));
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break;
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case TCSETSF:
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error = _copy_from_user(&tios, args, sizeof(tios));
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if (error)
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break;
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error = (IOCTL(TIOCSETAF, (rt_caddr_t)&tios, fflags, td));
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break;
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case TCGETA:
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error = IOCTL(TIOCGETA, (rt_caddr_t)&tios, fflags, td);
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if (error)
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break;
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termios_to_termio(&tios, &tio);
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error = _copy_to_user((void *)args, &tio, sizeof(tio));
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break;
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case TCSETA:
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error = _copy_from_user(&tio, (void *)args, sizeof(tio));
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if (error)
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break;
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termio_to_termios(&tio, &tios);
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error = (IOCTL(TIOCSETA, (rt_caddr_t)&tios, fflags, td));
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break;
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case TCSETAW:
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error = _copy_from_user(&tio, (void *)args, sizeof(tio));
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if (error)
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break;
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termio_to_termios(&tio, &tios);
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error = (IOCTL(TIOCSETAW, (rt_caddr_t)&tios, fflags, td));
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break;
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case TCSETAF:
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error = _copy_from_user(&tio, (void *)args, sizeof(tio));
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if (error)
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break;
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termio_to_termios(&tio, &tios);
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error = (IOCTL(TIOCSETAF, (rt_caddr_t)&tios, fflags, td));
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break;
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case TCSBRK:
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if (args != 0)
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{
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/**
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* Linux manual: SVr4, UnixWare, Solaris, and Linux treat
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* tcsendbreak(fd,arg) with nonzero arg like tcdrain(fd).
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*/
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error = IOCTL(TIOCDRAIN, (rt_caddr_t)&tios, fflags, td);
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}
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else
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{
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/**
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* Linux manual: If the terminal is using asynchronous serial
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* data transmission, and arg is zero, then send a break (a
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* stream of zero bits) for between 0.25 and 0.5 seconds.
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*/
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LOG_D("%s: ioctl TCSBRK arg 0 not implemented", __func__);
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error = -ENOSYS;
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}
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break;
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#ifdef USING_BSD_IOCTL_EXT
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/* Software flow control */
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case TCXONC: {
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switch (args->arg)
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{
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case TCOOFF:
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args->cmd = TIOCSTOP;
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break;
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case TCOON:
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args->cmd = TIOCSTART;
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break;
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case TCIOFF:
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case TCION: {
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int c;
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struct write_args wr;
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error = IOCTL(TIOCGETA, (rt_caddr_t)&tios, fflags,
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td);
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if (error)
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break;
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fdrop(fp, td);
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c = (args->arg == TCIOFF) ? VSTOP : VSTART;
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c = tios.c_cc[c];
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if (c != _POSIX_VDISABLE)
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{
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wr.fd = args->fd;
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wr.buf = &c;
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wr.nbyte = sizeof(c);
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return (sys_write(td, &wr));
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}
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else
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return 0;
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}
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default:
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fdrop(fp, td);
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return -EINVAL;
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}
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args->arg = 0;
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error = (sys_ioctl(td, (struct ioctl_args *)args));
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break;
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}
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#endif /* USING_BSD_IOCTL_EXT */
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case TCFLSH: {
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int val;
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error = 0;
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switch ((rt_base_t)args)
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{
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case TCIFLUSH:
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val = FREAD;
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break;
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case TCOFLUSH:
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val = FWRITE;
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break;
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case TCIOFLUSH:
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val = FREAD | FWRITE;
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break;
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default:
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error = -EINVAL;
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break;
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}
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if (!error)
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error = (IOCTL(TIOCFLUSH, (rt_caddr_t)&val, fflags, td));
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break;
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}
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#ifdef USING_BSD_IOCTL_EXT
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case TIOCEXCL:
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args->cmd = TIOCEXCL;
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error = (sys_ioctl(td, (struct ioctl_args *)args));
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break;
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case TIOCNXCL:
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args->cmd = TIOCNXCL;
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error = (sys_ioctl(td, (struct ioctl_args *)args));
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break;
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#endif /* USING_BSD_IOCTL_EXT */
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/* Controlling terminal */
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case TIOCSCTTY:
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case TIOCNOTTY:
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/* Process group and session ID */
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case TIOCGPGRP:
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case TIOCSPGRP:
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case TIOCGSID:
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/* TIOCOUTQ */
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/* TIOCSTI */
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case TIOCGWINSZ:
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case TIOCSWINSZ:
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error = IOCTL(cmd, (rt_caddr_t)args, fflags, td);
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break;
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#ifdef USING_BSD_IOCTL_EXT
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case TIOCMGET:
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args->cmd = TIOCMGET;
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error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case TIOCMBIS:
|
|
args->cmd = TIOCMBIS;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case TIOCMBIC:
|
|
args->cmd = TIOCMBIC;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case TIOCMSET:
|
|
args->cmd = TIOCMSET;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
/* TIOCGSOFTCAR */
|
|
/* TIOCSSOFTCAR */
|
|
|
|
case FIONREAD: /* TIOCINQ */
|
|
args->cmd = FIONREAD;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
/* TIOCLINUX */
|
|
|
|
case TIOCCONS:
|
|
args->cmd = TIOCCONS;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case TIOCGSERIAL: {
|
|
struct linux_serial_struct lss;
|
|
|
|
bzero(&lss, sizeof(lss));
|
|
lss.type = PORT_16550A;
|
|
lss.flags = 0;
|
|
lss.close_delay = 0;
|
|
error = copyout(&lss, (void *)args->arg, sizeof(lss));
|
|
break;
|
|
}
|
|
|
|
case TIOCSSERIAL: {
|
|
struct linux_serial_struct lss;
|
|
error = copyin((void *)args->arg, &lss, sizeof(lss));
|
|
if (error)
|
|
break;
|
|
/* XXX - It really helps to have an implementation that
|
|
* does nothing. NOT!
|
|
*/
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
case TIOCPKT:
|
|
args->cmd = TIOCPKT;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case FIONBIO:
|
|
args->cmd = FIONBIO;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case TIOCSETD: {
|
|
int line;
|
|
switch (args->arg)
|
|
{
|
|
case N_TTY:
|
|
line = TTYDISC;
|
|
break;
|
|
case N_SLIP:
|
|
line = SLIPDISC;
|
|
break;
|
|
case N_PPP:
|
|
line = PPPDISC;
|
|
break;
|
|
default:
|
|
fdrop(fp, td);
|
|
return -EINVAL;
|
|
}
|
|
error = (ioctl_emit(TIOCSETD, (rt_caddr_t)&line, fflags, td));
|
|
break;
|
|
}
|
|
|
|
case TIOCGETD: {
|
|
int linux_line;
|
|
int bsd_line = TTYDISC;
|
|
error =
|
|
ioctl_emit(TIOCGETD, (rt_caddr_t)&bsd_line, fflags, td);
|
|
if (error)
|
|
break;
|
|
switch (bsd_line)
|
|
{
|
|
case TTYDISC:
|
|
linux_line = N_TTY;
|
|
break;
|
|
case SLIPDISC:
|
|
linux_line = N_SLIP;
|
|
break;
|
|
case PPPDISC:
|
|
linux_line = N_PPP;
|
|
break;
|
|
default:
|
|
fdrop(fp, td);
|
|
return -EINVAL;
|
|
}
|
|
error = (copyout(&linux_line, (void *)args->arg, sizeof(int)));
|
|
break;
|
|
}
|
|
|
|
/* TCSBRKP */
|
|
/* TIOCTTYGSTRUCT */
|
|
|
|
case FIONCLEX:
|
|
args->cmd = FIONCLEX;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case FIOCLEX:
|
|
args->cmd = FIOCLEX;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case FIOASYNC:
|
|
args->cmd = FIOASYNC;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
/* TIOCSERCONFIG */
|
|
/* TIOCSERGWILD */
|
|
/* TIOCSERSWILD */
|
|
/* TIOCGLCKTRMIOS */
|
|
/* TIOCSLCKTRMIOS */
|
|
|
|
case TIOCSBRK:
|
|
args->cmd = TIOCSBRK;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
|
|
case TIOCCBRK:
|
|
args->cmd = TIOCCBRK;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
case TIOCGPTN: {
|
|
int nb;
|
|
|
|
error = ioctl_emit(TIOCGPTN, (rt_caddr_t)&nb, fflags, td);
|
|
if (!error)
|
|
error = copyout(&nb, (void *)args->arg, sizeof(int));
|
|
break;
|
|
}
|
|
case TIOCGPTPEER:
|
|
linux_msg(td, "unsupported ioctl TIOCGPTPEER");
|
|
error = -ENOIOCTL;
|
|
break;
|
|
case TIOCSPTLCK:
|
|
/*
|
|
* Our unlockpt() does nothing. Check that fd refers
|
|
* to a pseudo-terminal master device.
|
|
*/
|
|
args->cmd = TIOCPTMASTER;
|
|
error = (sys_ioctl(td, (struct ioctl_args *)args));
|
|
break;
|
|
#endif /* USING_BSD_IOCTL_EXT */
|
|
|
|
/**
|
|
* those are for current implementation of devfs, and we dont want to
|
|
* log them
|
|
*/
|
|
case F_DUPFD:
|
|
case F_DUPFD_CLOEXEC:
|
|
case F_GETFD:
|
|
case F_SETFD:
|
|
case F_GETFL:
|
|
case F_SETFL:
|
|
/* fall back to fs */
|
|
error = -ENOIOCTL;
|
|
break;
|
|
default:
|
|
LOG_I("%s: unhandle commands 0x%x", __func__, cmd);
|
|
error = -ENOSYS;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|