23f31f2a3a
successfully emulates a few test program that use poll semaphores, including the attach-to-file-descriptor-and-select feature. There are a few issues: 1) at least one ioctl need to set retval. We handle this in irix_sys_ioctl() by replacing the data argument by a pointer to a strucutre in the stackgap that carries the real data and retval. The underlying ioctl methods can therefore retreive both data and retval. 2) usemaclone is a cloning device: each time it is open, it creates a new context, and ioctl operation on each open file descriptor will lead to different behavior. This functionnality is available in NetBSD through the devvp branch. This first implementation does not use devvp yet, but this should be done later. Currently, we create a new vnode, and we provide our own vnode operations. Some operation are applied to the cloned vnode, others are applied to the original vnode. The v_data field is used to hold a reference to the original vnode so that we can work on it. 3) at least the setattr vnode operation needs some customisation: IRIX libc relies on the fact that fchmod on /dev/usema will return 0 in case of failure.
154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
/* $NetBSD: irix_ioctl.c,v 1.2 2002/05/22 05:14:01 manu Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Emmanuel Dreyfus
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: irix_ioctl.c,v 1.2 2002/05/22 05:14:01 manu Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/file.h>
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#include <sys/filio.h>
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#include <sys/filedesc.h>
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#include <sys/ioctl.h>
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#include <sys/vnode.h>
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#include <sys/types.h>
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#include <sys/syscallargs.h>
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#include <miscfs/specfs/specdev.h>
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#include <compat/common/compat_util.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_lwp.h>
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#include <compat/svr4/svr4_ucontext.h>
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#include <compat/svr4/svr4_signal.h>
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#include <compat/svr4/svr4_syscall.h>
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#include <compat/svr4/svr4_syscallargs.h>
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#include <compat/irix/irix_ioctl.h>
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#include <compat/irix/irix_usema.h>
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#include <compat/irix/irix_signal.h>
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#include <compat/irix/irix_types.h>
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#include <compat/irix/irix_exec.h>
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#include <compat/irix/irix_syscallargs.h>
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int
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irix_sys_ioctl(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct irix_sys_ioctl_args /* {
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syscallarg(int) fd;
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syscallarg(u_long) com;
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syscallarg(caddr_t) data;
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} */ *uap = v;
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u_long cmd;
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caddr_t data;
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struct file *fp;
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struct filedesc *fdp;
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struct vnode *vp;
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struct irix_ioctl_usrdata iiu;
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struct irix_ioctl_usrdata *iiup;
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caddr_t sg = stackgap_init(p, 0);
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int error;
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/*
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* This duplicates 6 lines from svr4_sys_ioctl()
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* It would be nice to merge it.
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*/
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fdp = p->p_fd;
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cmd = SCARG(uap, com);
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data = SCARG(uap, data);
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if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
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return EBADF;
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if ((fp->f_flag & (FREAD | FWRITE)) == 0)
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return EBADF;
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/*
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* A special hook for /dev/usemaclone ioctls. Some of the ioctl
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* commands need to set the return value, which is normally
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* impossible in the file methods and lower. We do the job by
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* copying the retval address and the data argument to a
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* struct irix_ioctl_usrdata in the stackgap. The data argument
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* is set to the address of the structure, and the underlying
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* code will be able to retreive both data and the retval address
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* by fecthing the struct irix_ioctl_usrdata.
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*
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* We also bypass the checks in sys_ioctl() because theses ioctl
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* are defined _IO but really are _IOR. XXX need security review.
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*/
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if ((cmd & IRIX_UIOC_MASK) == IRIX_UIOC) {
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FILE_USE(fp);
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vp = (struct vnode*)fp->f_data;
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if (vp->v_type != VCHR || vp->v_rdev != irix_usemaclonedev) {
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error = ENOTTY;
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goto out;
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}
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iiup = stackgap_alloc(p, &sg, sizeof(iiu));
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iiu.iiu_data = data;
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iiu.iiu_retval = retval;
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data = (caddr_t)iiup;
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if ((error = copyout(&iiu, iiup, sizeof(iiu))) != 0)
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goto out;
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error = (*fp->f_ops->fo_ioctl)(fp, cmd, data, p);
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out:
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FILE_UNUSE(fp, p);
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return error;
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}
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switch (cmd) {
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case IRIX_SIOCNREAD: /* number of bytes to read */
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return (*(fp->f_ops->fo_ioctl))(fp, FIONREAD,
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SCARG(uap, data), p);
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break;
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default: /* Fallback to the standard SVR4 ioctl's */
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error = svr4_sys_ioctl(p, v, retval);
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break;
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}
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return error;
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}
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