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I want to know how I can "give" a forked process a different dynamic library than the one it "asks" for. For example, if the fork "asks" for the library "foo.so" the main process "intercepts" that and instead provides "bar.so".
Considering I don't know much about how dynamic libraries are loaded, it's very much possible that this is impossible.

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You can set LD_LIBRARY_PATH for the forked process in execve pointing to a directory with your custom version of foo.so. More about shared libraries and environmental variables that control the loading process here.

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