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(release_upto): Ditto. (dll_list::reserve_space): New function to reserve space needed by DLL_LOAD dlls early in the fork process. (dll_list::load_after_fork): Rewrite to use recursion to track reservations it makes while trying to make dlls land where they belong. (dll_list::load_after_fork_impl): New function used by load_after_fork. (dll_list::alloc): Initialize image base field. * dll_init.h (dll_list::prefered_base): New field. (dll_list::reserve_space): Declare new function. (dll_list::load_after_fork): Declare new function. * fork.cc (frok::child): call dll_list::reserve_space early, so we can retry if it fails.
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