libc {

  GLIBC_2.4 {

    ioperm; iopl;

    inb; inw; inl;

    outb; outw; outl;

  }

  GLIBC_2.11 {

    fallocate64;

  }

  GLIBC_2.24 {

    recvmsg; sendmsg;

  }

  GLIBC_PRIVATE {

    # A copy of sigaction lives in libpthread, and needs these.

    __default_sa_restorer; __default_rt_sa_restorer;

    # nptl/pthread_cond_timedwait.c uses INTERNAL_VSYSCALL(clock_gettime).

    __vdso_clock_gettime;

  }

}