Where are functions in ANSI C such as strlen() or getchar() defined on a linux system? You are able to look through the header files but there's no definitions. Sometimes you see a declaration. I think someone told me a while back they are in shared object files *.so files in /usr/lib/. If this is correct, I was wondering how someone would make a shared object file like someone did in libpcap or libdnet? Thanks in advance.
To get the source code for standard library functions like strlen, try
http://www.gnu.org/software/libc/libc.html
As for other packages, maybe try the home page of where the package originates, or perhaps sourceforge?
In either case, someone else compiles the source code down to a set of library files, and then these library files are distributed.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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