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Programming Interfaces
External Program Interfaces : Host Language Call Interface : HLC applications on UNIX systems : Handling raw disk I/O
 
Handling raw disk I/O
On UNIX systems that do not provide a synchronous write instruction, ABL uses raw disk I/O when writing to some of its key files. An HLC link script automatically modifies the permissions and ownership of the executable it creates. However, you might have to supply a root password when running the link script. If your OpenEdge executable does not have proper permissions, UNIX displays a message similar to the following when you attempt to execute the new module:
Unable to use raw disk I/O