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Diffstat (limited to '')
| -rw-r--r-- | doc/man3/OSSL_PARAM.pod | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/man3/OSSL_PARAM.pod b/doc/man3/OSSL_PARAM.pod index 361028fa00..df532b4264 100644 --- a/doc/man3/OSSL_PARAM.pod +++ b/doc/man3/OSSL_PARAM.pod @@ -87,6 +87,11 @@ setting parameters) or shall (when requesting parameters) be stored, and I<data_size> is its size in bytes. The organization of the data depends on the parameter type and flag. +When I<requesting parameters>, it's acceptable for I<data> to be NULL. +This can be used by the I<requestor> to figure out dynamically exactly +how much buffer space is needed to store the parameter data. +In this case, I<data_size> is ignored. + When the B<OSSL_PARAM> is used as a parameter descriptor, I<data> should be ignored. If I<data_size> is zero, it means that an arbitrary data size is |