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Use the xcompre exit to validate all locally and remotely initiated transfers before they begin, and to customize parameters for that transfer as indicated below. This exit is invoked by specifying the XPRECMD parameter in xcom.glb. If XPRECMD is set when xcomd is invoked, the pre-allocation exit will be active for remotely initiated transfers. This gives the system administrator additional capabilities to control access, such as allowing only a particular user to perform a transfer, or only allowing transfers to or from a particular directory.
Customization is useful in certain applications where the remote user does not specify the true file name, and the local system uses a database to map the specified name to the true local name. For example, certain e-mail application systems work in this way. By way of additional explanation, for example, an incoming transfer specifies a certain file name, but the administrator of the local system that is receiving the file wants to place the data in a different file, depending on the user ID of the sender. The script retrieves parameter values and sends the relevant information to standard output, using the -g option, and if desired, changes the values using the -p option.
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