>With Solaris, is there a way to specify the set of symbols that you want
>to be visible from the library or are all symbols that need to be
>shared between modules within the library visible no matter what?
Yes; this is done through linker mapfiles.
For a (not that) typical example see usr/src/lib/libumem/common/mapfile:
(This also assigns version numbers which allow the runtime linker to quickly
determine whether a program will run with a particular library version)
(NODIRECT supresses direct binding and is not relevant here;
global: symbols are exported;
local: symbols are not;
the default is to export all, hence the "local: *;" clause at the end.
SUNW_1.1 {
global:
calloc = NODIRECT;
free = NODIRECT;
malloc = NODIRECT;
memalign = NODIRECT;
realloc = NODIRECT;
umem_alloc;
umem_cache_alloc;
umem_cache_create;
umem_cache_destroy;
umem_cache_free;
umem_free;
umem_nofail_callback;
umem_zalloc;
valloc = NODIRECT;
};
SUNWprivate_1.1 {
global:
umem_alloc_align;
umem_free_align;
umem_reap;
vmem_add;
vmem_alloc;
vmem_contains;
vmem_create;
vmem_destroy;
vmem_free;
vmem_heap_arena;
vmem_size;
vmem_walk;
vmem_xalloc;
vmem_xfree;
local:
*;
};
