Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)

System Functions (n - p) put_setOSSFileIOHandler(2)
RETURN VALUES
PUT_SUCCESS
This value is returned for any of the following conditions:
The filedes interest was successfully set
The filedes was not registered prior to this call
The specified filedes is invalid
The specified filedes is not supported
PUT_ERROR The specified filedes was less than 0 (zero).
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