/sys$common/syshlp/helplib.hlb CC, Run-time functions, sigsuspend  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Atomically changes the set of blocked signals and waits for a
  signal.

  Syntax:

        #include <signal.h>

        int sigsuspend (const sigset_t *signal_mask);