BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
version(!OPENSSL_NO_SCTP)
extern (C) nothrow
enum BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE = 50;

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