making changes in libc - take 2

[asenat dadon]

greetings
my name is asnat dadon and I"m a phd student at the Ben gurion university israel
in my research i need to make changes in the libc for adding new and
modify current functionality,
during my search for the libc code I had found this link:
https://code.woboq.org/userspace/glibc. nevertheless, it seems not to
have all the libc code

my questions are as follows:
1. i appreciate if you send me a site that include all the libc code
2. where can i found the wrapper functions for the exec family, open,
write, fork etc. by wrapper function i mean something like:
    void wrapper_function()
        exec functional code
        invoke interrupt
    end wrapper_function
3. i will also appreciate if you can specify a name of a member that
is located in israel if possible

thank you very much
asnat