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Diffstat (limited to 'openssl/doc/ssl/SSL_write.pod')
-rw-r--r-- | openssl/doc/ssl/SSL_write.pod | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/openssl/doc/ssl/SSL_write.pod b/openssl/doc/ssl/SSL_write.pod deleted file mode 100644 index 4c1a7ee..0000000 --- a/openssl/doc/ssl/SSL_write.pod +++ /dev/null @@ -1,106 +0,0 @@ -=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 |