FreeBSD/Linux Kernel Cross Reference
sys/fs/procfs/procfs_mem.c

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1993 Jan-Simon Pendry
      * Copyright (c) 1993 Sean Eric Fagan
      * Copyright (c) 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
     * Jan-Simon Pendry and Sean Eric Fagan.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)procfs_mem.c        8.5 (Berkeley) 6/15/94
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/ptrace.h>
    #include <sys/systm.h>
    #include <sys/uio.h>
    
    #include <fs/pseudofs/pseudofs.h>
    #include <fs/procfs/procfs.h>
    
    /*
     * Copy data in and out of the target process.
     * We do this by mapping the process's page into
     * the kernel and then doing a uiomove direct
     * from the kernel address space.
     */
    int
    procfs_doprocmem(PFS_FILL_ARGS)
    {
            int error;
    
            if (uio->uio_resid == 0)
                    return (0);
    
            PROC_LOCK(p);
            error = p_candebug(td, p);
            PROC_UNLOCK(p);
            if (error == 0)
                    error = proc_rwmem(p, uio);
    
            return (error);
    }

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