FreeBSD/Linux Kernel Cross Reference
sys/conf/kmod_syms.awk

     # $FreeBSD$
     
     # Read global symbols from object file.
     BEGIN {
             modname = ARGV[1]
             while ("${NM:='nm'} -g " ARGV[1] | getline) {
                     if (match($0, /^[^[:space:]]+ [^AU] (.*)$/)) {
                             syms[$3] = $2
                     }
            }
            delete ARGV[1]
    }
    
    # De-list symbols from the export list.
    {
            smbl = $0
            if (!(smbl in syms)) {
                    printf "Symbol %s is not present in %s\n",      \
                        smbl, modname > "/dev/stderr"
            }
            delete syms[smbl]
    }
    
    # Strip commons, make everything else local.
    END {
            for (member in syms) {
                    if (syms[member] == "C")
                            print "-N" member
                    else
                            print "-L" member
            }
    }

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