Guardian Procedure Calls Reference Manual

◦ A file opened by FILE_OPEN_ uses direct I/O transfers by default; you can use SETMODE
function 72 to force the system to use an intermediate buffer in the process file segment
(PFS) for I/O transfers. A file opened by OPEN uses a PFS buffer for I/O transfers, except
for large transfers to DP2 disks.
◦ If the extended address of the buffer is odd, bounds checking rounds the address to the
next lower word boundary and checks an extra byte as well. The odd address is used
for the transfer.
• See also the FILE_READ64_ procedure Considerations (page 477).
OSS Considerations
This procedure operates only on Guardian objects. If an OSS file is specified, error 2 is returned.
Related Programming Manuals
For programming information about the FILE_READLOCK64_ procedure, see the Guardian
Programmer's Guide, the Enscribe Programmer's Guide, and the data communication manuals.
FILE_READLOCK64_ Procedure 485