libc {
  GLIBC_2.0 {
    # functions with special/multiple interfaces
    __bsd_getpgrp; __setpgid; __getpgid;

    # functions which have an additional interface since they are
    # are cancelable.
    __libc_wait; __libc_waitpid; __libc_pause; __libc_nanosleep;

    # functions with required interface outside normal name space
    _exit;

    # functions used in other libraries
    __sched_get_priority_max; __sched_get_priority_min;
    __sched_getparam; __sched_getscheduler; __sched_setscheduler;
    __sched_yield; __fork; __getpid; __wait;

    # global variables
    __environ; _environ;

    # variables in normal name space
    environ; optarg; opterr; optind; optopt;
    re_max_failures; re_syntax_options;

    # a*
    alarm;

    # c*
    confstr;

    # e*
    execl; execle; execlp; execv; execve; execvp; fexecve;

    # f*
    fnmatch; fork; fpathconf; freeaddrinfo;

    # g*
    getaddrinfo; getdtablesize; getegid; geteuid; getgid; getopt; getopt_long;
    getopt_long_only; getpgid; getpgrp; getpid; getppid; getsid; getuid; glob;
    glob_pattern_p; globfree; group_member;

    # n*
    nanosleep;

    # p*
    pathconf; pause; pselect;

    # r*
    re_comp; re_compile_fastmap; re_compile_pattern; re_exec; re_match;
    re_match_2; re_search; re_search_2; re_set_registers; re_set_syntax;
    regcomp; regerror; regexec; regfree;

    # s*
    sched_get_priority_max; sched_get_priority_min; sched_getparam;
    sched_getscheduler; sched_rr_get_interval; sched_setparam;
    sched_setscheduler; sched_yield; setegid; seteuid; setgid; setlogin;
    setpgid; setpgrp; setsid; setuid; sleep; sysconf;

    # t*
    times;

    # u*
    uname;

    # v*
    vfork;

    # w*
    wait; wait3; wait4; waitpid;
  }
  GLIBC_2.1 {
    # functions used in other libraries
    __pread64; __pwrite64;

    # g*
    gai_strerror; getnameinfo; glob64; globfree64;

    # p*
    pread; pread64; pwrite; pwrite64;

    # w*
    waitid; wordexp; wordfree;
  }
}