Setting child proc affinity before fork() ?

The CPU_* macros and sched_setaffinity() etc allow you to try and force a
given process to run on a given CPU/core , but is there a way to set the
affinity of a process yet to be created by fork() ? Eg if I have a parent
process running on CPU 0 can I make it so that the child will run on CPU 1
before the child is created so that the child itself doesn't have to set
the affinity? I'm thinking of situations with fork-exec when the exec'd
binary won't set any affinity so the parent needs to do it for it.

Thanks for any help.