Versions

libc {
  GLIBC_2.0 {
    # functions with special/multiple interfaces
    __sigaddset; __sigdelset; __sigismember; __sysv_signal;

    # functions used in inline functions or macros
    __sigpause;

    # functions used in other libraries
     __sigaction;

    # b*
    bsd_signal;

    # g*
    gsignal;

    # k*
    kill; killpg;

    # p*
    psignal;

    # r*
    raise;

    # s*
    sigaction; sigaddset; sigaltstack; sigandset; sigblock; sigdelset;
    sigemptyset; sigfillset; siggetmask; siginterrupt; sigisemptyset;
    sigismember; siglongjmp; signal; sigorset; sigpause; sigpending;
    sigprocmask; sigreturn; sigsetmask; sigstack; sigsuspend; sigvec;
    sigwait; ssignal;
  }
  GLIBC_2.1 {
    # helper functions
    __libc_current_sigrtmin; __libc_current_sigrtmax; __libc_allocate_rtsig;

    # s*
    sighold; sigrelse; sigignore; sigset; sysv_signal;

    # New RT signal functions.
    sigqueue; sigtimedwait; sigwaitinfo;
  }
  GLIBC_2.1.3 {
    # LinuxThreads needs this entry point.
    __sigsuspend;
  }
  GLIBC_2.2 {
    # Needed to provide a pointer to the XPG sigpause function.
    __xpg_sigpause;
  }
  GLIBC_2.21 {
  }
}