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cr_seeothergids — determine visibility of objects given their group memberships
int cr_seeothergids(struct ucred *u1, struct ucred *u2);
This function determines the visibility of objects in the kernel based on the group 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_gids. If this variable is non-zero then all objects in the kernel are visible to each other irrespective of their group membership. 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 at least one of u1's group IDs is present in u2's group set.
security.bsd.see_other_gids 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.