where syscall(?) in libc

[Miwa Susumu]

hi.

I'm studying for NetBSD.

I think libc implmented system call (e.g. chmod(2)).
src/lib/libc/sys/Makefile.inc:

ASM=    access.S acct.S \
    bind.S \
    chdir.S chflags.S chmod.S chown.S chroot.S __clock_getres50.S \
        __clock_gettime50.S \
    dup.S dup2.S dup3.S \
    :

but I can't found chmod.S.
Where can I find chmod.S?

by the way, I use i386.

-- 
miwarin