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setenv
======

Syntax
------

     #include <stdlib.h>
     
     int setenv(const char *name, const char *value, int rewrite);

Description
-----------

This function sets the environment variable NAME to VALUE.  If REWRITE
is set, then this function will replace any existing value.  If it is
not set, it will only put the variable into the environment if that
variable isn't already defined.

Return Value
------------

Zero on success, -1 on failure.