How does the resolve function in ELF files know what libs are the symbols in?

How does the resolve function in ELF files know what libs are the symbols in?

References

Reference NO 1

http://stackoverflow.com/questions/15190185/how-does-the-resolve-function-in-elf-files-know-what-libs-are-the-symbols-in

Reference NO 2

http://stackoverflow.com/questions/tagged/elf?page=3&sort=newest

Reference NO 3

http://grugq.github.io/docs/subversiveld.pdf

Reference NO 4

http://www.qnx.com/developers/docs/6.3.0SP3/neutrino/sys_arch/dll.html

Reference NO 5

http://cs.nyu.edu/~xiaojian/bookmark/linux/ld_so%20%20Dynamic-Link%20Library%20support.htm

Reference NO 6

http://www.bottomupcs.com/libraries_and_the_linker.html

Reference NO 7

http://ftp.gnu.org/pub/old-gnu/Manuals/ld-2.9.1/html_node/ld_3.html

Reference NO 8

http://www.ibm.com/developerworks/library/l-dynamic-libraries/