0cc7521383
Implement a "variable" directory structure. Files that do not make sense for the given process do not "appear" and cannot be opened. For example, "system" processes do not have "file", "regs" or "fpregs", because they do not have a user area. "attempt" to fill in the user area of a given process when it is being accessed via /proc/pid/mem (the user struct is just after VM_MAXUSER_ADDRESS in the process address space.) Dont do IO to the U area while it's swapped, hold it in place if possible. Lock off access to the "ctl" file if it's done a setuid like the other pseudo-files in there.
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/*
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* Copyright (c) 1993 Jan-Simon Pendry
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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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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* @(#)procfs_fpregs.c 8.1 (Berkeley) 1/27/94
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*
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* $Id: procfs_fpregs.c,v 1.2 1994/08/02 07:45:12 davidg Exp $
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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/time.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <machine/reg.h>
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#include <miscfs/procfs/procfs.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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int
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procfs_dofpregs(curp, p, pfs, uio)
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struct proc *curp;
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struct proc *p;
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struct pfsnode *pfs;
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struct uio *uio;
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{
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int error;
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struct fpreg r;
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char *kv;
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int kl;
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kl = sizeof(r);
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kv = (char *) &r;
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kv += uio->uio_offset;
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kl -= uio->uio_offset;
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if (kl > uio->uio_resid)
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kl = uio->uio_resid;
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PHOLD(p);
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if (kl < 0)
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error = EINVAL;
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else
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error = procfs_read_fpregs(p, &r);
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if (error == 0)
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error = uiomove(kv, kl, uio);
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if (error == 0 && uio->uio_rw == UIO_WRITE) {
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if (p->p_stat != SSTOP)
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error = EBUSY;
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else
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error = procfs_write_fpregs(p, &r);
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}
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PRELE(p);
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uio->uio_offset = 0;
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return (error);
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}
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int
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procfs_validfpregs(p)
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struct proc *p;
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{
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return ((p->p_flag & P_SYSTEM) == 0);
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}
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