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.\" ========================================================================
.\"
.IX Title "SSL_CTX_set_mode 3"
.TH SSL_CTX_set_mode 3 "2008-09-06" "0.9.8h" "OpenSSL"
.SH "NAME"
SSL_CTX_set_mode, SSL_set_mode, SSL_CTX_get_mode, SSL_get_mode \- manipulate SSL engine mode
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
.Ve
.PP
.Vb 2
\& long SSL_CTX_set_mode(SSL_CTX *ctx, long mode);
\& long SSL_set_mode(SSL *ssl, long mode);
.Ve
.PP
.Vb 2
\& long SSL_CTX_get_mode(SSL_CTX *ctx);
\& long SSL_get_mode(SSL *ssl);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISSL_CTX_set_mode()\fR adds the mode set via bitmask in \fBmode\fR to \fBctx\fR.
Options already set before are not cleared.
.PP
\&\fISSL_set_mode()\fR adds the mode set via bitmask in \fBmode\fR to \fBssl\fR.
Options already set before are not cleared.
.PP
\&\fISSL_CTX_get_mode()\fR returns the mode set for \fBctx\fR.
.PP
\&\fISSL_get_mode()\fR returns the mode set for \fBssl\fR.
.SH "NOTES"
.IX Header "NOTES"
The following mode changes are available:
.IP "\s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0" 4
.IX Item "SSL_MODE_ENABLE_PARTIAL_WRITE"
Allow SSL_write(..., n) to return r with 0 < r < n (i.e. report success
when just a single record has been written). When not set (the default),
\&\fISSL_write()\fR will only report success once the complete chunk was written.
Once \fISSL_write()\fR returns with r, r bytes have been successfully written
and the next call to \fISSL_write()\fR must only send the n\-r bytes left,
imitating the behaviour of \fIwrite()\fR.
.IP "\s-1SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER\s0" 4
.IX Item "SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER"
Make it possible to retry \fISSL_write()\fR with changed buffer location
(the buffer contents must stay the same). This is not the default to avoid
the misconception that non-blocking \fISSL_write()\fR behaves like
non-blocking \fIwrite()\fR.
.IP "\s-1SSL_MODE_AUTO_RETRY\s0" 4
.IX Item "SSL_MODE_AUTO_RETRY"
Never bother the application with retries if the transport is blocking.
If a renegotiation take place during normal operation, a
\&\fISSL_read\fR\|(3) or \fISSL_write\fR\|(3) would return
with \-1 and indicate the need to retry with \s-1SSL_ERROR_WANT_READ\s0.
In a non-blocking environment applications must be prepared to handle
incomplete read/write operations.
In a blocking environment, applications are not always prepared to
deal with read/write operations returning without success report. The
flag \s-1SSL_MODE_AUTO_RETRY\s0 will cause read/write operations to only
return after the handshake and successful completion.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fISSL_CTX_set_mode()\fR and \fISSL_set_mode()\fR return the new mode bitmask
after adding \fBmode\fR.
.PP
\&\fISSL_CTX_get_mode()\fR and \fISSL_get_mode()\fR return the current bitmask.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIssl\fR\|(3), \fISSL_read\fR\|(3), \fISSL_write\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\s-1SSL_MODE_AUTO_RETRY\s0 as been added in OpenSSL 0.9.6.