ngtcp2_crypto_write_connection_close
====================================

Synopsis
--------

*#include <ngtcp2/ngtcp2_crypto.h>*

.. function:: ngtcp2_ssize ngtcp2_crypto_write_connection_close( uint8_t *dest, size_t destlen, uint32_t version, const ngtcp2_cid *dcid, const ngtcp2_cid *scid, uint64_t error_code, const uint8_t *reason, size_t reasonlen)

    
    `ngtcp2_crypto_write_connection_close` writes Initial packet
    containing CONNECTION_CLOSE with the given *error_code* and the
    optional *reason* of length *reasonlen* to the buffer pointed by
    *dest* of length *destlen*.  This function is designed for server
    to close connection without committing the state when validating
    Retry token fails.  This function must not be used by client.  The
    *dcid* must be the Source Connection ID in Initial packet from
    client.  The *scid* must be the Destination Connection ID in
    Initial packet from client.  *scid* is used to derive initial
    keying materials.
    
    This function wraps around `ngtcp2_pkt_write_connection_close` for
    easier use.
    
    This function returns 0 if it succeeds, or -1.