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_spawn... Constants
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Constant:  _P_OVERLAY, _P_WAIT
 
  Include:   <process.h>
 
  Context:   _spawn family of functions
 
  Summary:   The <modeflag> argument determines the action taken by the
             parent process before and during spawn.
 
     The following values for <modeflag> are possible:
 
     Constant       Meaning
 
     _P_OVERLAY     Overlays parent process with child, destroying the
                    parent (same effect as exec calls).
 
     _P_WAIT        Suspends parent process until execution of child
                    process is complete (synchronous spawn).
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