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cr_seeotheruids — determine visibility of objects given their user
cr_seeotheruids(struct ucred *u1, struct ucred *u2);
This function determines the visibility of objects in the kernel based on
the real user IDs in the credentials u1 and u2 associated with them.
The visibility of objects is influenced by the sysctl(8) variable
security.bsd.see_other_uids. If this variable is non-zero then all
objects in the kernel are visible to each other irrespective of their
user IDs. If this variable is zero then the object with credentials u2
is visible to the object with credentials u1 if either u1 is the super-
user credential, or if u1 and u2 have the same real user ID.
Must be non-zero if objects with unprivileged credentials are to
be able to see each other.
This function returns zero if the object with credential u1 can “see” the
object with credential u2, or ESRCH otherwise.