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            #include <openssl/ssl.h>
            int SSL_write(SSL *ssl, const void *buf, int num);


           SSL_write() writes num bytes from the buffer buf into the specified ssl


           If necessary, SSL_write() will negotiate a TLS/SSL session, if not
           already explicitly performed by SSL_connect(3) or SSL_accept(3). If the
           peer requests a re-negotiation, it will be performed transparently
           during the SSL_write() operation. The behaviour of SSL_write() depends
           on the underlying BIO.
           For the transparent negotiation to succeed, the ssl must have been
           initialized to client or server mode. This is being done by calling
           SSL_set_connect_state(3) or SSL_set_accept_state() before the first
           call to an SSL_read(3) or SSL_write() function.
           If the underlying BIO is blocking, SSL_write() will only return, once
           the write operation has been finished or an error occurred, except when
           a renegotiation take place, in which case a SSL_ERROR_WANT_READ may
           occur.  This behaviour can be controlled with the SSL_MODE_AUTO_RETRY
           flag of the SSL_CTX_set_mode(3) call.
           If the underlying BIO is non-blocking, SSL_write() will also return,
           when the underlying BIO could not satisfy the needs of SSL_write() to
           continue the operation. In this case a call to SSL_get_error(3) with
           the return value of SSL_write() will yield SSL_ERROR_WANT_READ or
           SSL_ERROR_WANT_WRITE. As at any time a re-negotiation is possible, a
           call to SSL_write() can also cause read operations! The calling process
           then must repeat the call after taking appropriate action to satisfy
           the needs of SSL_write(). The action depends on the underlying BIO.
           When using a non-blocking socket, nothing is to be done, but select()
           can be used to check for the required condition. When using a buffering
           BIO, like a BIO pair, data must be written into or retrieved out of the
           BIO before being able to continue.
           SSL_write() will only return with success, when the complete contents
           of buf of length num has been written. This default behaviour can be
           changed with the SSL_MODE_ENABLE_PARTIAL_WRITE option of
           SSL_CTX_set_mode(3). When this flag is set, SSL_write() will also
           return with success, when a partial write has been successfully
           completed. In this case the SSL_write() operation is considered
           completed. The bytes are sent and a new SSL_write() operation with a
           new buffer (with the already sent bytes removed) must be started.  A
           partial write is performed with the size of a message block, which is
           16kB for SSLv3/TLSv1.


               connection was closed. Call SSL_get_error() with the return value
               ret to find out, whether an error occurred or the connection was
               shut down cleanly (SSL_ERROR_ZERO_RETURN).
               SSLv2 (deprecated) does not support a shutdown alert protocol, so
               it can only be detected, whether the underlying connection was
               closed. It cannot be checked, why the closure happened.
           <0  The write operation was not successful, because either an error
               occurred or action must be taken by the calling process. Call
               SSL_get_error() with the return value ret to find out the reason.


           SSL_get_error(3), SSL_read(3), SSL_CTX_set_mode(3), SSL_CTX_new(3),
           SSL_connect(3), SSL_accept(3) SSL_set_connect_state(3), ssl(3), bio(3)

    1.0.1e 2017-03-22 SSL_write(3)


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