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Returns the error number value associated with the last referenced socket.
&ZSOCERRN is set in combination with &ZFDBK and &ZSOCVERR. For more information, see the appendix "&SOCKET Verbs".
Example: &ZSOCERRN
&SOCKET SEND ID=&SOCKID DATA=&MSG &IF &RETCODE NE 0 &THEN + &WRITE DATA=SEND FAILED ERRNO=&ZSOCERRN
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