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105 lines
3.2 KiB
Groff
105 lines
3.2 KiB
Groff
.\"
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.\" Copyright (c) 2015 Mark Johnston <markj@FreeBSD.org>
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 7, 2015
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.Dt PROC_RWMEM 9
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.Os
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.Sh NAME
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.Nm proc_rwmem ,
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.Nm proc_readmem ,
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.Nm proc_writemem
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.Nd read from or write to a process address space
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/ptrace.h
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.Ft int
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.Fn proc_rwmem "struct proc *p" "struct uio *uio"
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.Ft ssize_t
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.Fn proc_readmem "struct thread *td" "struct proc *p" "vm_offset_t va" "void *buf" "size_t len"
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.Ft ssize_t
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.Fn proc_writemem "struct thread *td" "struct proc *p" "vm_offset_t va" "void *buf" "size_t len"
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.Sh DESCRIPTION
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These functions are used to read to or write from the address space of the
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process
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.Fa p .
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The
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.Fn proc_rwmem
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function requires the caller to specify the I/O parameters using a
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.Vt "struct uio" ,
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described in
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.Xr uio 9 .
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The
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.Fn proc_readmem
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and
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.Fn proc_writemem
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functions provide a simpler, less general interface which allows the caller to
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read into or write the kernel buffer
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.Fa buf
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of size
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.Fa len
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from or to the memory at offset
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.Fa va
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in the address space of
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.Fa p .
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The operation is performed on behalf of thread
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.Fa td ,
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which will most often be the current thread.
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.Pp
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These functions may sleep and thus may not be called with any non-sleepable
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locks held.
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The process
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.Fa p
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must be held by the caller using
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.Xr PHOLD 9 .
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.Sh RETURN VALUES
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The
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.Fn proc_rwmem
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function returns
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.Dv 0
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on success.
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.Dv EFAULT
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is returned if the specified user address is invalid, and
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.Dv ENOMEM
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is returned if the target pages could not be faulted in due to a resource
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shortage.
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.Pp
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The
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.Fn proc_readmem
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and
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.Fn proc_writemem
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functions return the number of bytes read or written, respectively.
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This may be smaller than the number of bytes requested, for example if the
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request spans multiple pages in the process address space and one of them after
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the first is not mapped.
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Otherwise, -1 is returned.
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.Sh SEE ALSO
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.Xr copyin 9 ,
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.Xr locking 9 ,
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.Xr PHOLD 9 ,
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.Xr uio 9
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.Sh AUTHORS
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This manual page was written by
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.An Mark Johnston Aq Mt markj@FreeBSD.org .
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