1214 lines
29 KiB
C
1214 lines
29 KiB
C
/*
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* Copyright (c) 1997-2020 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)tty_pty.c 8.4 (Berkeley) 2/20/95
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*/
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/* Common callbacks for the pseudo-teletype driver (pty/tty)
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* and cloning pseudo-teletype driver (ptmx/pts).
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/proc_internal.h>
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#include <sys/kauth.h>
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#include <sys/tty.h>
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#include <sys/conf.h>
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#include <sys/file_internal.h>
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#include <sys/uio_internal.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/vnode_internal.h> /* _devfs_setattr() */
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#include <sys/stat.h> /* _devfs_setattr() */
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#include <sys/user.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <miscfs/devfs/devfs.h>
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#include <miscfs/devfs/devfsdefs.h> /* DEVFS_LOCK()/DEVFS_UNLOCK() */
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#include <dev/kmreg_com.h>
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#include <machine/cons.h>
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#if CONFIG_MACF
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#include <security/mac_framework.h>
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#endif
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#include "tty_dev.h"
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/* XXX belongs in devfs somewhere - LATER */
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static int _devfs_setattr(void *, unsigned short, uid_t, gid_t);
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/*
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* Forward declarations
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*/
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static void ptcwakeup(struct tty *tp, int flag);
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__XNU_PRIVATE_EXTERN d_open_t ptsopen;
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__XNU_PRIVATE_EXTERN d_close_t ptsclose;
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__XNU_PRIVATE_EXTERN d_read_t ptsread;
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__XNU_PRIVATE_EXTERN d_write_t ptswrite;
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__XNU_PRIVATE_EXTERN d_ioctl_t ptyioctl; /* common ioctl */
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__XNU_PRIVATE_EXTERN d_stop_t ptsstop;
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__XNU_PRIVATE_EXTERN d_reset_t ptsreset;
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__XNU_PRIVATE_EXTERN d_select_t ptsselect;
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__XNU_PRIVATE_EXTERN d_open_t ptcopen;
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__XNU_PRIVATE_EXTERN d_close_t ptcclose;
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__XNU_PRIVATE_EXTERN d_read_t ptcread;
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__XNU_PRIVATE_EXTERN d_write_t ptcwrite;
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__XNU_PRIVATE_EXTERN d_stop_t ptcstop; /* NO-OP */
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__XNU_PRIVATE_EXTERN d_reset_t ptcreset;
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__XNU_PRIVATE_EXTERN d_select_t ptcselect;
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/*
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* XXX Should be devfs function... and use VATTR mechanisms, per
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* XXX vnode_setattr2(); only we maybe can't really get back to the
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* XXX vnode here for cloning devices (but it works for *cloned* devices
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* XXX that are not themselves cloning).
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*
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* Returns: 0 Success
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* namei:???
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* vnode_setattr:???
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*/
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static int
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_devfs_setattr(void * handle, unsigned short mode, uid_t uid, gid_t gid)
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{
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devdirent_t *direntp = (devdirent_t *)handle;
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devnode_t *devnodep;
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int error = EACCES;
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vfs_context_t ctx = vfs_context_current();
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struct vnode_attr va;
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VATTR_INIT(&va);
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VATTR_SET(&va, va_uid, uid);
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VATTR_SET(&va, va_gid, gid);
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VATTR_SET(&va, va_mode, mode & ALLPERMS);
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/*
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* If the TIOCPTYGRANT loses the race with the clone operation because
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* this function is not part of devfs, and therefore can't take the
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* devfs lock to protect the direntp update, then force user space to
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* redrive the grant request.
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*/
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if (direntp == NULL || (devnodep = direntp->de_dnp) == NULL) {
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error = ERESTART;
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goto out;
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}
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/*
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* Only do this if we are operating on device that doesn't clone
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* each time it's referenced. We perform a lookup on the device
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* to insure we get the right instance. We can't just use the call
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* to devfs_dntovn() to get the vp for the operation, because
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* dn_dvm may not have been initialized.
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*/
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if (devnodep->dn_clone == NULL) {
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struct nameidata nd;
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char name[128];
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snprintf(name, sizeof(name), "/dev/%s", direntp->de_name);
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NDINIT(&nd, LOOKUP, OP_SETATTR, FOLLOW, UIO_SYSSPACE, CAST_USER_ADDR_T(name), ctx);
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error = namei(&nd);
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if (error) {
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goto out;
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}
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error = vnode_setattr(nd.ni_vp, &va, ctx);
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vnode_put(nd.ni_vp);
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nameidone(&nd);
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goto out;
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}
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out:
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return error;
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}
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#define BUFSIZ 100 /* Chunk size iomoved to/from user */
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static struct tty_dev_t *tty_dev_head;
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__private_extern__ void
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tty_dev_register(struct tty_dev_t *driver)
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{
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if (driver) {
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driver->next = tty_dev_head;
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tty_dev_head = driver;
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}
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}
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/*
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* Given a minor number, return the corresponding structure for that minor
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* number. If there isn't one, and the create flag is specified, we create
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* one if possible.
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*
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* Parameters: minor Minor number of ptmx device
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* open_flag PF_OPEN_M First open of primary
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* PF_OPEN_S First open of replica
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* 0 Just want ioctl struct
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*
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* Returns: NULL Did not exist/could not create
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* !NULL structure corresponding minor number
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*
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* Locks: tty_lock() on ptmx_ioctl->pt_tty NOT held on entry or exit.
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*/
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static struct tty_dev_t *
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pty_get_driver(dev_t dev)
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{
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int major = major(dev);
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struct tty_dev_t *driver;
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for (driver = tty_dev_head; driver != NULL; driver = driver->next) {
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if ((driver->primary == major || driver->replica == major)) {
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break;
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}
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}
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return driver;
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}
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static struct ptmx_ioctl *
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pty_get_ioctl(dev_t dev, int open_flag, struct tty_dev_t **out_driver)
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{
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struct tty_dev_t *driver = pty_get_driver(dev);
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if (out_driver) {
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*out_driver = driver;
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}
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if (driver && driver->open) {
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return driver->open(minor(dev), open_flag);
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}
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return NULL;
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}
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/*
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* Locks: tty_lock() of old_ptmx_ioctl->pt_tty NOT held for this call.
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*/
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static int
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pty_free_ioctl(dev_t dev, int open_flag)
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{
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struct tty_dev_t *driver = pty_get_driver(dev);
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if (driver && driver->free) {
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return driver->free(minor(dev), open_flag);
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}
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return 0;
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}
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static int
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pty_get_name(dev_t dev, char *buffer, size_t size)
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{
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struct tty_dev_t *driver = pty_get_driver(dev);
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if (driver && driver->name) {
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return driver->name(minor(dev), buffer, size);
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}
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return 0;
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}
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__private_extern__ int
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ptsopen(dev_t dev, int flag, __unused int devtype, __unused struct proc *p)
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{
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int error;
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struct tty_dev_t *driver;
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bool free_ptmx_ioctl = true;
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struct ptmx_ioctl *pti = pty_get_ioctl(dev, PF_OPEN_S, &driver);
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if (pti == NULL) {
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return ENXIO;
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}
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if (!(pti->pt_flags & PF_UNLOCKED)) {
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error = EAGAIN;
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goto out_free;
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}
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struct tty *tp = pti->pt_tty;
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tty_lock(tp);
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if ((tp->t_state & TS_ISOPEN) == 0) {
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termioschars(&tp->t_termios); /* Set up default chars */
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tp->t_iflag = TTYDEF_IFLAG;
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tp->t_oflag = TTYDEF_OFLAG;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_cflag = TTYDEF_CFLAG;
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tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
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ttsetwater(tp); /* would be done in xxparam() */
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} else if ((tp->t_state & TS_XCLUDE) && kauth_cred_issuser(kauth_cred_get())) {
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error = EBUSY;
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goto out_unlock;
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}
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if (tp->t_oproc) { /* Ctrlr still around. */
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(void)(*linesw[tp->t_line].l_modem)(tp, 1);
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}
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while ((tp->t_state & TS_CARR_ON) == 0) {
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if (flag & FNONBLOCK) {
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break;
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}
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error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, __FUNCTION__, 0);
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if (error) {
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goto out_unlock;
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}
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}
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error = (*linesw[tp->t_line].l_open)(dev, tp);
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/* Successful open; mark as open by the replica */
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free_ptmx_ioctl = false;
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CLR(tp->t_state, TS_IOCTL_NOT_OK);
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if (error == 0) {
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ptcwakeup(tp, FREAD | FWRITE);
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}
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out_unlock:
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tty_unlock(tp);
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out_free:
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if (free_ptmx_ioctl) {
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pty_free_ioctl(dev, PF_OPEN_S);
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}
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return error;
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}
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__private_extern__ int
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ptsclose(dev_t dev, int flag, __unused int mode, __unused proc_t p)
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{
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int err;
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/*
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* This is temporary until the VSX conformance tests
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* are fixed. They are hanging with a deadlock
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* where close() will not complete without t_timeout set
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*/
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#define FIX_VSX_HANG 1
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#ifdef FIX_VSX_HANG
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int save_timeout;
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#endif
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struct tty_dev_t *driver;
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struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver);
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struct tty *tp;
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if (pti == NULL) {
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return ENXIO;
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}
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tp = pti->pt_tty;
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tty_lock(tp);
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#ifdef FIX_VSX_HANG
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save_timeout = tp->t_timeout;
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tp->t_timeout = 60;
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#endif
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/*
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* Close the line discipline and backing TTY structures.
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*/
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err = (*linesw[tp->t_line].l_close)(tp, flag);
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(void)ttyclose(tp);
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|
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/*
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* Flush data and notify any waiters on the primary side of this PTY.
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*/
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ptsstop(tp, FREAD | FWRITE);
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#ifdef FIX_VSX_HANG
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tp->t_timeout = save_timeout;
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#endif
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tty_unlock(tp);
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|
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if ((flag & IO_REVOKE) == IO_REVOKE && driver->revoke) {
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driver->revoke(minor(dev), tp);
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}
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/* unconditional, just like ttyclose() */
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pty_free_ioctl(dev, PF_OPEN_S);
|
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|
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return err;
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}
|
|
|
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__private_extern__ int
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ptsread(dev_t dev, struct uio *uio, int flag)
|
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{
|
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struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL);
|
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struct tty *tp;
|
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int error = 0;
|
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struct uthread *ut;
|
|
|
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if (pti == NULL) {
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return ENXIO;
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}
|
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tp = pti->pt_tty;
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tty_lock(tp);
|
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|
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ut = current_uthread();
|
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if (tp->t_oproc) {
|
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error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
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}
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ptcwakeup(tp, FWRITE);
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tty_unlock(tp);
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return error;
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}
|
|
|
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/*
|
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* Write to pseudo-tty.
|
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* Wakeups of controlling tty will happen
|
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* indirectly, when tty driver calls ptsstart.
|
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*/
|
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__private_extern__ int
|
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ptswrite(dev_t dev, struct uio *uio, int flag)
|
|
{
|
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struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL);
|
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struct tty *tp;
|
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int error;
|
|
|
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if (pti == NULL) {
|
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return ENXIO;
|
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}
|
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tp = pti->pt_tty;
|
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tty_lock(tp);
|
|
|
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if (tp->t_oproc == 0) {
|
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error = EIO;
|
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} else {
|
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error = (*linesw[tp->t_line].l_write)(tp, uio, flag);
|
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}
|
|
|
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tty_unlock(tp);
|
|
|
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return error;
|
|
}
|
|
|
|
/*
|
|
* Start output on pseudo-tty.
|
|
* Wake up process selecting or sleeping for input from controlling tty.
|
|
*
|
|
* t_oproc for this driver; called from within the line discipline
|
|
*
|
|
* Locks: Assumes tp is locked on entry, remains locked on exit
|
|
*/
|
|
static void
|
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ptsstart(struct tty *tp)
|
|
{
|
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struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL);
|
|
if (pti == NULL) {
|
|
goto out;
|
|
}
|
|
if (tp->t_state & TS_TTSTOP) {
|
|
goto out;
|
|
}
|
|
if (pti->pt_flags & PF_STOPPED) {
|
|
pti->pt_flags &= ~PF_STOPPED;
|
|
pti->pt_send = TIOCPKT_START;
|
|
}
|
|
ptcwakeup(tp, FREAD);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
static void
|
|
ptcwakeup_knote(struct selinfo *sip, long hint)
|
|
{
|
|
if ((sip->si_flags & SI_KNPOSTING) == 0) {
|
|
sip->si_flags |= SI_KNPOSTING;
|
|
KNOTE(&sip->si_note, hint);
|
|
sip->si_flags &= ~SI_KNPOSTING;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Locks: Assumes tty_lock() is held over this call.
|
|
*/
|
|
static void
|
|
ptcwakeup(struct tty *tp, int flag)
|
|
{
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL);
|
|
if (pti == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (flag & FREAD) {
|
|
selwakeup(&pti->pt_selr);
|
|
wakeup(TSA_PTC_READ(tp));
|
|
ptcwakeup_knote(&pti->pt_selr, 1);
|
|
}
|
|
if (flag & FWRITE) {
|
|
selwakeup(&pti->pt_selw);
|
|
wakeup(TSA_PTC_WRITE(tp));
|
|
ptcwakeup_knote(&pti->pt_selw, 1);
|
|
}
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptcopen(dev_t dev, __unused int flag, __unused int devtype, __unused proc_t p)
|
|
{
|
|
struct tty_dev_t *driver;
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(dev, PF_OPEN_M, &driver);
|
|
if (pti == NULL) {
|
|
return ENXIO;
|
|
} else if (pti == (struct ptmx_ioctl*)-1) {
|
|
return EREDRIVEOPEN;
|
|
}
|
|
|
|
struct tty *tp = pti->pt_tty;
|
|
tty_lock(tp);
|
|
|
|
/* If primary is open OR replica is still draining, pty is still busy */
|
|
if (tp->t_oproc || (tp->t_state & TS_ISOPEN)) {
|
|
tty_unlock(tp);
|
|
/*
|
|
* If primary is closed, we are the only reference, so we
|
|
* need to clear the primary open bit
|
|
*/
|
|
if (!tp->t_oproc) {
|
|
pty_free_ioctl(dev, PF_OPEN_M);
|
|
}
|
|
return EBUSY;
|
|
}
|
|
tp->t_oproc = ptsstart;
|
|
CLR(tp->t_state, TS_ZOMBIE);
|
|
SET(tp->t_state, TS_IOCTL_NOT_OK);
|
|
#ifdef sun4c
|
|
tp->t_stop = ptsstop;
|
|
#endif
|
|
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
|
|
tp->t_lflag &= ~EXTPROC;
|
|
|
|
if (driver->open_reset) {
|
|
pti->pt_flags = PF_UNLOCKED;
|
|
pti->pt_send = 0;
|
|
pti->pt_ucntl = 0;
|
|
}
|
|
|
|
tty_unlock(tp);
|
|
return 0;
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptcclose(dev_t dev, __unused int flags, __unused int fmt, __unused proc_t p)
|
|
{
|
|
struct tty_dev_t *driver;
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver);
|
|
struct tty *tp;
|
|
struct tty *constty = NULL;
|
|
struct tty *freetp = NULL;
|
|
|
|
if (!pti) {
|
|
return ENXIO;
|
|
}
|
|
|
|
tp = pti->pt_tty;
|
|
tty_lock(tp);
|
|
|
|
constty = copy_constty();
|
|
|
|
if (constty == tp) {
|
|
freetp = set_constty(NULL);
|
|
if (freetp != NULL) {
|
|
if (freetp == tp) {
|
|
ttyfree_locked(freetp);
|
|
} else {
|
|
ttyfree(freetp);
|
|
}
|
|
freetp = NULL;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Closing current console tty; disable printing of console
|
|
* messages at bottom-level driver.
|
|
*/
|
|
(*cdevsw[major(tp->t_dev)].d_ioctl)
|
|
(tp->t_dev, KMIOCDISABLCONS, NULL, 0, current_proc());
|
|
}
|
|
|
|
if (constty != NULL) {
|
|
if (constty == tp) {
|
|
ttyfree_locked(constty);
|
|
} else {
|
|
ttyfree(constty);
|
|
}
|
|
constty = NULL;
|
|
}
|
|
|
|
/*
|
|
* XXX MDMBUF makes no sense for PTYs, but would inhibit an `l_modem`.
|
|
* CLOCAL makes sense but isn't supported. Special `l_modem`s that ignore
|
|
* carrier drop make no sense for PTYs but may be in use because other parts
|
|
* of the line discipline make sense for PTYs. Recover by doing everything
|
|
* that a normal `ttymodem` would have done except for sending SIGHUP.
|
|
*/
|
|
(void)(*linesw[tp->t_line].l_modem)(tp, 0);
|
|
if (tp->t_state & TS_ISOPEN) {
|
|
tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
|
|
tp->t_state |= TS_ZOMBIE;
|
|
ttyflush(tp, FREAD | FWRITE);
|
|
}
|
|
|
|
/*
|
|
* Null out the backing TTY struct's open procedure to prevent starting
|
|
* replicas through `ptsstart`.
|
|
*/
|
|
tp->t_oproc = NULL;
|
|
|
|
/*
|
|
* Clear any select or kevent waiters under the lock.
|
|
*/
|
|
knote(&pti->pt_selr.si_note, NOTE_REVOKE, true);
|
|
selthreadclear(&pti->pt_selr);
|
|
knote(&pti->pt_selw.si_note, NOTE_REVOKE, true);
|
|
selthreadclear(&pti->pt_selw);
|
|
|
|
tty_unlock(tp);
|
|
|
|
pty_free_ioctl(dev, PF_OPEN_M);
|
|
#if CONFIG_MACF
|
|
if (driver->mac_notify) {
|
|
mac_pty_notify_close(p, tp, dev, NULL);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptcread(dev_t dev, struct uio *uio, int flag)
|
|
{
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL);
|
|
struct tty *tp;
|
|
char buf[BUFSIZ];
|
|
int error = 0, cc;
|
|
|
|
if (pti == NULL) {
|
|
return ENXIO;
|
|
}
|
|
tp = pti->pt_tty;
|
|
tty_lock(tp);
|
|
|
|
/*
|
|
* We want to block until the replica
|
|
* is open, and there's something to read;
|
|
* but if we lost the replica or we're NBIO,
|
|
* then return the appropriate error instead.
|
|
*/
|
|
for (;;) {
|
|
if (tp->t_state & TS_ISOPEN) {
|
|
if (pti->pt_flags & PF_PKT && pti->pt_send) {
|
|
error = ureadc((int)pti->pt_send, uio);
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
if (pti->pt_send & TIOCPKT_IOCTL) {
|
|
#ifdef __LP64__
|
|
if (uio->uio_segflg == UIO_USERSPACE32) {
|
|
static struct termios32 tio32;
|
|
cc = MIN((int)uio_resid(uio), (int)sizeof(tio32));
|
|
termios64to32((struct user_termios *)&tp->t_termios,
|
|
(struct termios32 *)&tio32);
|
|
uiomove((caddr_t)&tio32, cc, uio);
|
|
#else
|
|
if (uio->uio_segflg == UIO_USERSPACE64) {
|
|
static struct user_termios tio64;
|
|
cc = MIN((int)uio_resid(uio), (int)sizeof(tio64));
|
|
termios32to64((struct termios32 *)&tp->t_termios,
|
|
(struct user_termios *)&tio64);
|
|
uiomove((caddr_t)&tio64, cc, uio);
|
|
#endif
|
|
} else {
|
|
cc = MIN((int)uio_resid(uio), (int)sizeof(tp->t_termios));
|
|
uiomove((caddr_t)&tp->t_termios, cc, uio);
|
|
}
|
|
}
|
|
pti->pt_send = 0;
|
|
goto out;
|
|
}
|
|
if (pti->pt_flags & PF_UCNTL && pti->pt_ucntl) {
|
|
error = ureadc((int)pti->pt_ucntl, uio);
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
pti->pt_ucntl = 0;
|
|
goto out;
|
|
}
|
|
if (tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
if ((tp->t_state & TS_CONNECTED) == 0) {
|
|
goto out; /* EOF */
|
|
}
|
|
if (flag & IO_NDELAY) {
|
|
error = EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
error = ttysleep(tp, TSA_PTC_READ(tp), TTIPRI | PCATCH, __FUNCTION__, 0);
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
}
|
|
if (pti->pt_flags & (PF_PKT | PF_UCNTL)) {
|
|
error = ureadc(0, uio);
|
|
}
|
|
while (uio_resid(uio) > 0 && error == 0) {
|
|
cc = q_to_b(&tp->t_outq, (u_char *)buf, MIN((int)uio_resid(uio), BUFSIZ));
|
|
if (cc <= 0) {
|
|
break;
|
|
}
|
|
error = uiomove(buf, cc, uio);
|
|
}
|
|
(*linesw[tp->t_line].l_start)(tp);
|
|
|
|
out:
|
|
tty_unlock(tp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Line discipline callback
|
|
*
|
|
* Locks: tty_lock() is assumed held on entry and exit.
|
|
*/
|
|
__private_extern__ int
|
|
ptsstop(struct tty* tp, int flush)
|
|
{
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(tp->t_dev, 0, NULL);
|
|
int flag;
|
|
|
|
if (pti == NULL) {
|
|
return ENXIO;
|
|
}
|
|
|
|
/* note: FLUSHREAD and FLUSHWRITE already ok */
|
|
if (flush == 0) {
|
|
flush = TIOCPKT_STOP;
|
|
pti->pt_flags |= PF_STOPPED;
|
|
} else {
|
|
pti->pt_flags &= ~PF_STOPPED;
|
|
}
|
|
pti->pt_send |= flush;
|
|
/* change of perspective */
|
|
flag = 0;
|
|
if (flush & FREAD) {
|
|
flag |= FWRITE;
|
|
}
|
|
if (flush & FWRITE) {
|
|
flag |= FREAD;
|
|
}
|
|
ptcwakeup(tp, flag);
|
|
return 0;
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptsreset(__unused int uban)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ptsselect(dev_t dev, int rw, void *wql, proc_t p)
|
|
{
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL);
|
|
struct tty *tp;
|
|
int retval = 0;
|
|
|
|
if (pti == NULL) {
|
|
return ENXIO;
|
|
}
|
|
tp = pti->pt_tty;
|
|
if (tp == NULL) {
|
|
return ENXIO;
|
|
}
|
|
|
|
tty_lock(tp);
|
|
|
|
switch (rw) {
|
|
case FREAD:
|
|
if (ISSET(tp->t_state, TS_ZOMBIE)) {
|
|
retval = 1;
|
|
break;
|
|
}
|
|
|
|
retval = ttnread(tp);
|
|
if (retval > 0) {
|
|
break;
|
|
}
|
|
|
|
selrecord(p, &tp->t_rsel, wql);
|
|
break;
|
|
case FWRITE:
|
|
if (ISSET(tp->t_state, TS_ZOMBIE)) {
|
|
retval = 1;
|
|
break;
|
|
}
|
|
|
|
if ((tp->t_outq.c_cc <= tp->t_lowat) &&
|
|
ISSET(tp->t_state, TS_CONNECTED)) {
|
|
retval = tp->t_hiwat - tp->t_outq.c_cc;
|
|
break;
|
|
}
|
|
|
|
selrecord(p, &tp->t_wsel, wql);
|
|
break;
|
|
}
|
|
|
|
tty_unlock(tp);
|
|
return retval;
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptcselect(dev_t dev, int rw, void *wql, proc_t p)
|
|
{
|
|
struct tty_dev_t *driver;
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver);
|
|
struct tty *tp;
|
|
int retval = 0;
|
|
|
|
if (pti == NULL) {
|
|
return ENXIO;
|
|
}
|
|
tp = pti->pt_tty;
|
|
tty_lock(tp);
|
|
|
|
if ((tp->t_state & TS_CONNECTED) == 0) {
|
|
retval = 1;
|
|
goto out;
|
|
}
|
|
switch (rw) {
|
|
case FREAD:
|
|
/*
|
|
* Need to block timeouts (ttrstart).
|
|
*/
|
|
if ((tp->t_state & TS_ISOPEN) &&
|
|
tp->t_outq.c_cc && (tp->t_state & TS_TTSTOP) == 0) {
|
|
retval = (driver->fix_7828447) ? tp->t_outq.c_cc : 1;
|
|
break;
|
|
}
|
|
OS_FALLTHROUGH;
|
|
|
|
case 0: /* exceptional */
|
|
if ((tp->t_state & TS_ISOPEN) &&
|
|
(((pti->pt_flags & PF_PKT) && pti->pt_send) ||
|
|
((pti->pt_flags & PF_UCNTL) && pti->pt_ucntl))) {
|
|
retval = 1;
|
|
break;
|
|
}
|
|
selrecord(p, &pti->pt_selr, wql);
|
|
break;
|
|
|
|
|
|
case FWRITE:
|
|
if (tp->t_state & TS_ISOPEN) {
|
|
retval = (TTYHOG - 2) - (tp->t_rawq.c_cc + tp->t_canq.c_cc);
|
|
if (retval > 0) {
|
|
retval = (driver->fix_7828447) ? retval : 1;
|
|
break;
|
|
}
|
|
if (tp->t_canq.c_cc == 0 && (tp->t_lflag & ICANON)) {
|
|
retval = 1;
|
|
break;
|
|
}
|
|
retval = 0;
|
|
}
|
|
selrecord(p, &pti->pt_selw, wql);
|
|
break;
|
|
}
|
|
out:
|
|
tty_unlock(tp);
|
|
|
|
return retval;
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptcstop(__unused struct tty *tp, __unused int flush)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptcreset(__unused int uban)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
__private_extern__ int
|
|
ptcwrite(dev_t dev, struct uio *uio, int flag)
|
|
{
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, NULL);
|
|
struct tty *tp;
|
|
u_char *cp = NULL;
|
|
int cc = 0;
|
|
u_char locbuf[BUFSIZ];
|
|
int wcnt = 0;
|
|
int error = 0;
|
|
|
|
if (pti == NULL) {
|
|
return ENXIO;
|
|
}
|
|
tp = pti->pt_tty;
|
|
tty_lock(tp);
|
|
|
|
again:
|
|
if ((tp->t_state & TS_ISOPEN) == 0) {
|
|
goto block;
|
|
}
|
|
while (uio_resid(uio) > 0 || cc > 0) {
|
|
if (cc == 0) {
|
|
cc = MIN((int)uio_resid(uio), BUFSIZ);
|
|
cp = locbuf;
|
|
error = uiomove((caddr_t)cp, cc, uio);
|
|
if (error) {
|
|
goto out;
|
|
}
|
|
/* check again for safety */
|
|
if ((tp->t_state & TS_ISOPEN) == 0) {
|
|
/* adjust for data copied in but not written */
|
|
uio_setresid(uio, (uio_resid(uio) + cc));
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
while (cc > 0) {
|
|
if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
|
|
(tp->t_canq.c_cc > 0 || !(tp->t_lflag & ICANON))) {
|
|
wakeup(TSA_HUP_OR_INPUT(tp));
|
|
goto block;
|
|
}
|
|
OS_ANALYZER_SUPPRESS("80961525") (*linesw[tp->t_line].l_rint)(*cp++, tp);
|
|
wcnt++;
|
|
cc--;
|
|
}
|
|
cc = 0;
|
|
}
|
|
out:
|
|
tty_unlock(tp);
|
|
|
|
return error;
|
|
|
|
block:
|
|
/*
|
|
* Come here to wait for replica to open, for space
|
|
* in outq, or space in rawq, or an empty canq.
|
|
*/
|
|
if ((tp->t_state & TS_CONNECTED) == 0) {
|
|
/* adjust for data copied in but not written */
|
|
uio_setresid(uio, (uio_resid(uio) + cc));
|
|
error = EIO;
|
|
goto out;
|
|
}
|
|
if (flag & IO_NDELAY) {
|
|
/* adjust for data copied in but not written */
|
|
uio_setresid(uio, (uio_resid(uio) + cc));
|
|
if (wcnt == 0) {
|
|
error = EWOULDBLOCK;
|
|
}
|
|
goto out;
|
|
}
|
|
error = ttysleep(tp, TSA_PTC_WRITE(tp), TTOPRI | PCATCH, __FUNCTION__, 0);
|
|
if (error) {
|
|
/* adjust for data copied in but not written */
|
|
uio_setresid(uio, (uio_resid(uio) + cc));
|
|
goto out;
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* ptyioctl: Assumes dev was opened and lock was initilized
|
|
*/
|
|
__private_extern__ int
|
|
ptyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
|
|
{
|
|
struct tty_dev_t *driver;
|
|
struct ptmx_ioctl *pti = pty_get_ioctl(dev, 0, &driver);
|
|
struct tty *tp;
|
|
int stop, error = 0;
|
|
int allow_ext_ioctl = 1;
|
|
|
|
if (pti == NULL || pti->pt_tty == NULL) {
|
|
return ENXIO;
|
|
}
|
|
|
|
if (cmd == KMIOCDISABLCONS) {
|
|
return 0;
|
|
}
|
|
|
|
tp = pti->pt_tty;
|
|
tty_lock(tp);
|
|
|
|
u_char *cc = tp->t_cc;
|
|
|
|
/*
|
|
* Do not permit extended ioctls on the primary side of the pty unless
|
|
* the replica side has been successfully opened and initialized.
|
|
*/
|
|
if (major(dev) == driver->primary &&
|
|
driver->fix_7070978 &&
|
|
ISSET(tp->t_state, TS_IOCTL_NOT_OK)) {
|
|
allow_ext_ioctl = 0;
|
|
}
|
|
|
|
/*
|
|
* IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
|
|
* ttywflush(tp) will hang if there are characters in the outq.
|
|
*/
|
|
if (cmd == TIOCEXT && allow_ext_ioctl) {
|
|
/*
|
|
* When the EXTPROC bit is being toggled, we need
|
|
* to send an TIOCPKT_IOCTL if the packet driver
|
|
* is turned on.
|
|
*/
|
|
if (*(int *)data) {
|
|
if (pti->pt_flags & PF_PKT) {
|
|
pti->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
tp->t_lflag |= EXTPROC;
|
|
} else {
|
|
if ((tp->t_lflag & EXTPROC) &&
|
|
(pti->pt_flags & PF_PKT)) {
|
|
pti->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
tp->t_lflag &= ~EXTPROC;
|
|
}
|
|
goto out;
|
|
} else if (cdevsw[major(dev)].d_open == ptcopen) {
|
|
switch (cmd) {
|
|
case TIOCGPGRP:
|
|
/*
|
|
* We aviod calling ttioctl on the controller since,
|
|
* in that case, tp must be the controlling terminal.
|
|
*/
|
|
*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
|
|
goto out;
|
|
|
|
case TIOCPKT:
|
|
if (*(int *)data) {
|
|
if (pti->pt_flags & PF_UCNTL) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
pti->pt_flags |= PF_PKT;
|
|
} else {
|
|
pti->pt_flags &= ~PF_PKT;
|
|
}
|
|
goto out;
|
|
|
|
case TIOCUCNTL:
|
|
if (*(int *)data) {
|
|
if (pti->pt_flags & PF_PKT) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
pti->pt_flags |= PF_UCNTL;
|
|
} else {
|
|
pti->pt_flags &= ~PF_UCNTL;
|
|
}
|
|
goto out;
|
|
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
case TIOCSETD:
|
|
case TIOCSETA_32:
|
|
case TIOCSETAW_32:
|
|
case TIOCSETAF_32:
|
|
case TIOCSETA_64:
|
|
case TIOCSETAW_64:
|
|
case TIOCSETAF_64:
|
|
ndflush(&tp->t_outq, tp->t_outq.c_cc);
|
|
break;
|
|
|
|
case TIOCSIG:
|
|
if (*(unsigned int *)data >= NSIG ||
|
|
*(unsigned int *)data == 0) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
if ((tp->t_lflag & NOFLSH) == 0) {
|
|
ttyflush(tp, FREAD | FWRITE);
|
|
}
|
|
if ((*(unsigned int *)data == SIGINFO) &&
|
|
((tp->t_lflag & NOKERNINFO) == 0)) {
|
|
ttyinfo_locked(tp);
|
|
}
|
|
/*
|
|
* SAFE: All callers drop the lock on return and
|
|
* SAFE: the linesw[] will short circut this call
|
|
* SAFE: if the ioctl() is eaten before the lower
|
|
* SAFE: level code gets to see it.
|
|
*/
|
|
tty_pgsignal_locked(tp, *(unsigned int *)data, 1);
|
|
goto out;
|
|
|
|
case TIOCPTYGRANT: /* grantpt(3) */
|
|
/*
|
|
* Change the uid of the replica to that of the calling
|
|
* thread, change the gid of the replica to GID_TTY,
|
|
* change the mode to 0620 (rw--w----).
|
|
*/
|
|
{
|
|
error = _devfs_setattr(pti->pt_devhandle, 0620, kauth_getuid(), GID_TTY);
|
|
if (major(dev) == driver->primary) {
|
|
if (driver->mac_notify) {
|
|
#if CONFIG_MACF
|
|
if (!error) {
|
|
tty_unlock(tp);
|
|
mac_pty_notify_grant(p, tp, dev, NULL);
|
|
tty_lock(tp);
|
|
}
|
|
#endif
|
|
} else {
|
|
error = 0;
|
|
}
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
case TIOCPTYGNAME: /* ptsname(3) */
|
|
/*
|
|
* Report the name of the replica device in *data
|
|
* (128 bytes max.). Use the same template string
|
|
* used for calling devfs_make_node() to create it.
|
|
*/
|
|
pty_get_name(dev, data, 128);
|
|
error = 0;
|
|
goto out;
|
|
|
|
case TIOCPTYUNLK: /* unlockpt(3) */
|
|
/*
|
|
* Unlock the replica device so that it can be opened.
|
|
*/
|
|
if (major(dev) == driver->primary) {
|
|
pti->pt_flags |= PF_UNLOCKED;
|
|
}
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Fail all other calls; pty primaries are not serial devices;
|
|
* we only pretend they are when the replica side of the pty is
|
|
* already open.
|
|
*/
|
|
if (!allow_ext_ioctl) {
|
|
error = ENOTTY;
|
|
goto out;
|
|
}
|
|
}
|
|
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
|
|
if (error == ENOTTY) {
|
|
error = ttioctl_locked(tp, cmd, data, flag, p);
|
|
if (error == ENOTTY) {
|
|
if (pti->pt_flags & PF_UCNTL && (cmd & ~0xff) == UIOCCMD(0)) {
|
|
/* Process the UIOCMD ioctl group */
|
|
if (cmd & 0xff) {
|
|
pti->pt_ucntl = (u_char)cmd;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
error = 0;
|
|
goto out;
|
|
} else if (cmd == TIOCSBRK || cmd == TIOCCBRK) {
|
|
/*
|
|
* POSIX conformance; rdar://3936338
|
|
*
|
|
* Clear ENOTTY in the case of setting or
|
|
* clearing a break failing because pty's
|
|
* don't support break like real serial
|
|
* ports.
|
|
*/
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If external processing and packet mode send ioctl packet.
|
|
*/
|
|
if ((tp->t_lflag & EXTPROC) && (pti->pt_flags & PF_PKT)) {
|
|
switch (cmd) {
|
|
case TIOCSETA_32:
|
|
case TIOCSETAW_32:
|
|
case TIOCSETAF_32:
|
|
case TIOCSETA_64:
|
|
case TIOCSETAW_64:
|
|
case TIOCSETAF_64:
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
case TIOCSETC:
|
|
case TIOCSLTC:
|
|
case TIOCLBIS:
|
|
case TIOCLBIC:
|
|
case TIOCLSET:
|
|
pti->pt_send |= TIOCPKT_IOCTL;
|
|
ptcwakeup(tp, FREAD);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s'))
|
|
&& CCEQ(cc[VSTART], CTRL('q'));
|
|
if (pti->pt_flags & PF_NOSTOP) {
|
|
if (stop) {
|
|
pti->pt_send &= ~TIOCPKT_NOSTOP;
|
|
pti->pt_send |= TIOCPKT_DOSTOP;
|
|
pti->pt_flags &= ~PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
} else {
|
|
if (!stop) {
|
|
pti->pt_send &= ~TIOCPKT_DOSTOP;
|
|
pti->pt_send |= TIOCPKT_NOSTOP;
|
|
pti->pt_flags |= PF_NOSTOP;
|
|
ptcwakeup(tp, FREAD);
|
|
}
|
|
}
|
|
out:
|
|
tty_unlock(tp);
|
|
|
|
return error;
|
|
}
|