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merge with Lite, keep local changes.  clean up id usage

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.\"     @(#)valloc.3	8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt VALLOC 3
.Os BSD 3
.Sh NAME
.Nm valloc
.Nd aligned memory allocation function
.Sh SYNOPSIS
.Fd #include <unistd.h>
.Ft char *
.Fn valloc "unsigned size"
.Sh DESCRIPTION
.Bf -symbolic
Valloc is obsoleted by the current version of malloc(3),
which aligns page-sized and larger allocations.
.Ef
.Pp
The
.Fn valloc
function
allocates
.Fa size
bytes aligned on a page boundary.
It is implemented by calling
.Xr malloc 3
with a slightly larger request, saving the true beginning of the block
allocated, and returning a properly aligned pointer.
.Sh RETURN VALUES
The
.Fn valloc
function returns
a pointer to the allocated space if successful; otherwise
a null pointer is returned
.Sh HISTORY
The
.Fn valloc
function appeared in 
.Bx 3.0 .
.Sh BUGS
A
.Em vfree
function
has not been implemented.