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"Sourath Roy" <sourath@gmail.com> writes:

> Hi All,
> I am using NetBSD 3.0.1 and I was trying to call function rtalloc/rtfree

(This belongs on netbsd-help, not current-users.)

> from my program to retrieve route information for a destination address.
> Currently I am unable to link the program, it doesn't find rtalloc() and
> rtfree().
> (throws error: undefined reference to `rtalloc')
> I tried searching over the internet whether they are a part of any shared
> library and I need to point to that during the link.
> But so far I couldn't find something worth noting.

These are kernel functions, not userspace, so you simply cannot call
them from user programs.

> Can these functions be accessed from user programs? If yes, then
> please let me know how.

Probably you want to use the routing socket to ask the kernel about
the route.

See route(4), and in particular RTM_GET.

Also see route(8), and the get operation.
For example, do

  route get -n www.netbsd.org

The route(8) sources in src/sbin/route are likely a helpful example of
how to use the routing socket with RTM_GET.

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