The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1993 Jan-Simon Pendry
    3  * Copyright (c) 1993 Sean Eric Fagan
    4  * Copyright (c) 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Jan-Simon Pendry and Sean Eric Fagan.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)procfs_mem.c        8.5 (Berkeley) 6/15/94
   35  *
   36  * $FreeBSD: releng/8.4/sys/fs/procfs/procfs_mem.c 139776 2005-01-06 18:10:42Z imp $
   37  */
   38 
   39 #include <sys/param.h>
   40 #include <sys/lock.h>
   41 #include <sys/mutex.h>
   42 #include <sys/proc.h>
   43 #include <sys/ptrace.h>
   44 #include <sys/systm.h>
   45 #include <sys/uio.h>
   46 
   47 #include <fs/pseudofs/pseudofs.h>
   48 #include <fs/procfs/procfs.h>
   49 
   50 /*
   51  * Copy data in and out of the target process.
   52  * We do this by mapping the process's page into
   53  * the kernel and then doing a uiomove direct
   54  * from the kernel address space.
   55  */
   56 int
   57 procfs_doprocmem(PFS_FILL_ARGS)
   58 {
   59         int error;
   60 
   61         if (uio->uio_resid == 0)
   62                 return (0);
   63 
   64         PROC_LOCK(p);
   65         error = p_candebug(td, p);
   66         PROC_UNLOCK(p);
   67         if (error == 0)
   68                 error = proc_rwmem(p, uio);
   69 
   70         return (error);
   71 }

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