For a child spawned by a function from the exec family of
    functions, associates specified file descriptors with a child's
    standard streams: stdin, stdout, and stderr.

    Format

      #include  <unixlib.h>

      int decc$set_child_standard_streams  (int fd1, int fd2, int fd3);

  Additional Information (explode) :

• Arguments
• Description
• Return Values
• Example