Topic       : Pure C Library Documentation
Author      : John Kormylo
Version     : LIB.HYP 1.0
Subject     : Documentation/Pure C Library
Nodes       : 1309
Index Size  : 32068
HCP-Version : 3
Compiled on : Atari
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View Ref-File[ Redirection Address Table ]

  extern void* _RedirTab[6];

The redirection table is neither initialized by PCSTART, nor is it
used by any library function.  However, PCSTART contains a pointer to
it two bytes into the TEXT segment of the program, making it easy to
locate by another process.

One can use this feature to redirect I/O of an child process as
follows:

1) Load the child process into RAM using Pexec().
2) Insert jump vectors from the current process into the _RedirTab of
   the child process.
3) When the child process executes, it must look into _RedirTab for
   these jump vectors and execute them instead of using putc() etc.

This is how PCC.TTP etc. are able to write into the message window of
Pure C instead of to the VT52 emulator.