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-=pod
-
-=head1 NAME
-
-SSL_write - write bytes to a TLS/SSL connection.
-
-=head1 SYNOPSIS
-
- #include <openssl/ssl.h>
-
- int SSL_write(SSL *ssl, const void *buf, int num);
-
-=head1 DESCRIPTION
-
-SSL_write() writes B<num> bytes from the buffer B<buf> into the specified
-B<ssl> connection.
-
-=head1 NOTES
-
-If necessary, SSL_write() will negotiate a TLS/SSL session, if
-not already explicitly performed by L<SSL_connect(3)|SSL_connect(3)> or
-L<SSL_accept(3)|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 B<ssl> must have been
-initialized to client or server mode. This is being done by calling
-L<SSL_set_connect_state(3)|SSL_set_connect_state(3)> or SSL_set_accept_state()
-before the first call to an L<SSL_read(3)|SSL_read(3)> or SSL_write() function.
-
-If the underlying BIO is B<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
-L<SSL_CTX_set_mode(3)|SSL_CTX_set_mode(3)> call.
-
-If the underlying BIO is B<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
-L<SSL_get_error(3)|SSL_get_error(3)> with the
-return value of SSL_write() will yield B<SSL_ERROR_WANT_READ> or
-B<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 B<buf> of length B<num> has been written. This default behaviour
-can be changed with the SSL_MODE_ENABLE_PARTIAL_WRITE option of
-L<SSL_CTX_set_mode(3)|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.
-
-=head1 WARNING
-
-When an SSL_write() operation has to be repeated because of
-B<SSL_ERROR_WANT_READ> or B<SSL_ERROR_WANT_WRITE>, it must be repeated
-with the same arguments.
-
-When calling SSL_write() with num=0 bytes to be sent the behaviour is
-undefined.
-
-=head1 RETURN VALUES
-
-The following return values can occur:
-
-=over 4
-
-=item E<gt> 0
-
-The write operation was successful, the return value is the number of
-bytes actually written to the TLS/SSL connection.
-
-=item Z<><= 0
-
-The write operation was not successful, because either the connection was
-closed, an error occurred or action must be taken by the calling process.
-Call SSL_get_error() with the return value B<ret> to find out the reason.
-
-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.
-
-Old documentation indicated a difference between 0 and -1, and that -1 was
-retryable.
-You should instead call SSL_get_error() to find out if it's retryable.
-
-=back
-
-=head1 SEE ALSO
-
-L<SSL_get_error(3)|SSL_get_error(3)>, L<SSL_read(3)|SSL_read(3)>,
-L<SSL_CTX_set_mode(3)|SSL_CTX_set_mode(3)>, L<SSL_CTX_new(3)|SSL_CTX_new(3)>,
-L<SSL_connect(3)|SSL_connect(3)>, L<SSL_accept(3)|SSL_accept(3)>
-L<SSL_set_connect_state(3)|SSL_set_connect_state(3)>,
-L<ssl(3)|ssl(3)>, L<bio(3)|bio(3)>
-
-=cut