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+.\" DO NOT MODIFY THIS FILE!  It was generated by gdoc.
+.TH "gnutls_handshake" 3 "3.7.9" "gnutls" "gnutls"
+.SH NAME
+gnutls_handshake \- API function
+.SH SYNOPSIS
+.B #include <gnutls/gnutls.h>
+.sp
+.BI "int gnutls_handshake(gnutls_session_t " session ");"
+.SH ARGUMENTS
+.IP "gnutls_session_t session" 12
+is a \fBgnutls_session_t\fP type.
+.SH "DESCRIPTION"
+This function performs the handshake of the TLS/SSL protocol, and
+initializes the TLS session parameters.
+
+The non\-fatal errors expected by this function are:
+\fBGNUTLS_E_INTERRUPTED\fP, \fBGNUTLS_E_AGAIN\fP,
+\fBGNUTLS_E_WARNING_ALERT_RECEIVED\fP. When this function is called
+for re\-handshake under TLS 1.2 or earlier, the non\-fatal error code
+\fBGNUTLS_E_GOT_APPLICATION_DATA\fP may also be returned.
+
+The former two interrupt the handshake procedure due to the transport
+layer being interrupted, and the latter because of a "warning" alert that
+was sent by the peer (it is always a good idea to check any
+received alerts). On these non\-fatal errors call this function again,
+until it returns 0; cf.  \fBgnutls_record_get_direction()\fP and
+\fBgnutls_error_is_fatal()\fP. In DTLS sessions the non\-fatal error
+\fBGNUTLS_E_LARGE_PACKET\fP is also possible, and indicates that
+the MTU should be adjusted.
+
+When this function is called by a server after a rehandshake request
+under TLS 1.2 or earlier the \fBGNUTLS_E_GOT_APPLICATION_DATA\fP error code indicates
+that some data were pending prior to peer initiating the handshake.
+Under TLS 1.3 this function when called after a successful handshake, is a no\-op
+and always succeeds in server side; in client side this function is
+equivalent to \fBgnutls_session_key_update()\fP with \fBGNUTLS_KU_PEER\fP flag.
+
+This function handles both full and abbreviated TLS handshakes (resumption).
+For abbreviated handshakes, in client side, the \fBgnutls_session_set_data()\fP
+should be called prior to this function to set parameters from a previous session.
+In server side, resumption is handled by either setting a DB back\-end, or setting
+up keys for session tickets.
+.SH "RETURNS"
+\fBGNUTLS_E_SUCCESS\fP on a successful handshake, otherwise a negative error code.
+.SH "REPORTING BUGS"
+Report bugs to <bugs@gnutls.org>.
+.br
+Home page: https://www.gnutls.org
+
+.SH COPYRIGHT
+Copyright \(co 2001- Free Software Foundation, Inc., and others.
+.br
+Copying and distribution of this file, with or without modification,
+are permitted in any medium without royalty provided the copyright
+notice and this notice are preserved.
+.SH "SEE ALSO"
+The full documentation for
+.B gnutls
+is maintained as a Texinfo manual.
+If the /usr/share/doc/gnutls/
+directory does not contain the HTML form visit
+.B
+.IP https://www.gnutls.org/manual/
+.PP