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Re: [vox-tech] Relocation errors and dynamic symbols
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Re: [vox-tech] Relocation errors and dynamic symbols

Peter Jay Salzman wrote:

"U" doesn't mean a fatal undefined error; it simply means something that
needs to be linked on the fly by ld.so. Right? Is there a way of querying
ld.so about whether it "knows" a particular symbol?

The dynamic linker doesn't know about particular symbols. The nm executable contains a list of shared libraries that it was linked with; you can use ldd to see this list. When nm is executed, the dynamic linker loads those libraries into its address space and tries to resolve all of the undefined symbols.

The dynamic linker also has an API which can be invoked to access other libraries under the program's control. This is used by things like PAM to load authentication modules, or by mozilla to load plugins.
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