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doc: correct description of libpq's PQsetnonblocking() mode
Reported-by: Yugo NAGATA Discussion: https://postgr.es/m/20210713115949.702986955f8ccf23fa81073c@sraoss.co.jp Backpatch-through: 12-16, master already done
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@ -4941,11 +4941,12 @@ int PQsetnonblocking(PGconn *conn, int arg);
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</para>
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<para>
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In the nonblocking state, calls to
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In the nonblocking state, successful calls to
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<function>PQsendQuery</function>, <function>PQputline</function>,
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<function>PQputnbytes</function>, <function>PQputCopyData</function>,
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and <function>PQendcopy</function> will not block but instead return
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an error if they need to be called again.
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and <function>PQendcopy</function> will not block; their changes
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are stored in the local output buffer until they are flushed.
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Unsuccessful calls will return an error and must be retried.
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</para>
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<para>
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