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Some examples of ready-to-dynamic-load builtins. Most of the
examples given are reimplementations of standard commands whose
execution time is dominated by process startup time. The
exceptions are sleep, which allows you to sleep for fractions
of a second, finfo, which provides access to the rest of the
elements of the `stat' structure that `test' doesn't let you
see, and pushd/popd/dirs, which allows you to compile them out
of the shell.
All of the new builtins in ksh93 that bash didn't already have
are included here, as is the ksh `print' builtin.
Compile with cc and whatever pic options you need (look in the
Makefile for a few common settings)
load with ld and whatever shared object options you need (again,
look in the Makefile)
then enable -f filename builtin-name
enable uses a simple reference-counting scheme to avoid unloading a
shared object that implements more than one loadable builtin before
all loadable builtins implemented in the object are removed.
Many of the details needed by builtin writers are found in hello.c,
the canonical example. There is no real `builtin writers' programming
guide'.
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