SSL_write man page on QNX

Man page or keyword search:  
man Server   4347 pages
apropos Keyword Search (all sections)
Output format
QNX logo
[printable version]

SSL_write(3)			    OpenSSL			  SSL_write(3)

       SSL_write - write bytes to a TLS/SSL connection.

	#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.

       When an SSL_write() operation has to be repeated because of
       SSL_ERROR_WANT_READ or 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

       The following return values can occur:

       >0  The write operation was successful, the return value is the number
	   of bytes actually written to the TLS/SSL connection.

       0   The write operation was not successful. Probably the underlying
	   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)

0.9.8q				  2002-07-19			  SSL_write(3)
                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
More information is available in HTML format for server QNX

List of man pages available for QNX

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net