There is no need to include sys/uio.h here.

Drop test for msgbuf_drain() since that function is no longer part of the
public API.

Some KNF nits

Don't use ibuf_open(0) as test. 0 lenght ibufs make little sense and
result in a malloc(0) call which is no bueno. Use ibuf_open(1) instead.
OK miod@

Verify sizes before arithmetic operations

Unsigned overflows are not a bug in C but we have to make sure that
requested buffer sizes will be actually available.

If not, set errno to ERANGE and retu

Verify sizes before arithmetic operations

Unsigned overflows are not a bug in C but we have to make sure that
requested buffer sizes will be actually available.

If not, set errno to ERANGE and return an error value.

ok deraadt, millert

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