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Select z/OS UNIX System Services File System Interface Reference SA23-2285-00 |
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A PFS should consider supporting the vn_select operation if data for a read-type operation may arrive asynchronously when no read has been issued; or if buffers for a write-type operation are rationed and are therefore sometimes not immediately available (require a WAIT). The LFS answers READY for any select status requested from a PFS that does not support vn_select. See Select/poll processing for more details. |
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