SilcNotifyType Arguments
The SILC Client Library 'notify' client operation (which is part of the SilcClientOperation callback functions) returns different kind of notifications from the SILC server to the SILC client. The 'notify' client operation implementation has a variable argument list to deliver SilcNotifyType type specific arguments to the application. This document describes these arguments for all notify types to help SILC client software developers to handle the incoming notifications.
notify Client Library operation
The 'notify' client operation callback function prototype is as follows:
`void (*notify)(SilcClient client, SilcClientConnection conn, SilcNotifyType type, ...);`
The first argument 'client' is the SILC Client Library context, the `conn' is the context for the connection to the remote server, and the `type' is the notify type enumeration sent by the server. Rest of the arguments are `type' specific and implementation should handle them by the SilcNotifyType for example in a `switch` statement. The notify types are defined in lib/silccore/silcnotify.h header file. A short example:
`switch(type)
{
case SILC_NOTIFY_TYPE_NONE:
...
break;
case SILC_NOTIFY_TYPE_INVITE:
...
break;
case SILC_NOTIFY_TYPE_JOIN:
...
break;
...
}`
Arguments
The following table describes all notify types and arguments that the client library sends in the 'notify' client operation to the application. By default all arguments that the library sends to application are valid pointers. However, it is possible that some pointers may be NULL. If this is the case it is separately mentioned that the argument may be NULL. In this case application must ignore that argument. The SilcNotifyType arguments per notify type is as follows:

Name | Description | Variable Arguments
SILC_NOTIFY_TYPE_NONE | A message from server that usually does not include any critical information. Application may ignore this or display it for the user. The 'message' argument may be NULL. | char *message
SILC_NOTIFY_TYPE_INVITE | Sent to the client if the user is invited on a channel. The 'channel_name' argument may be NULL. | SilcClientChannel channel, char *channel_name, SilcClientEntry inviter
SILC_NOTIFY_TYPE_JOIN | Sent when someone joins to a channel. | SilcClientEntry joining_client, SilcChannelEntry channel
SILC_NOTIFY_TYPE_LEAVE | Sent when someone leaves (parts) the channel. | SilcClientEntry leaving_client, SilcChannelEntry channel
SILC_NOTIFY_TYPE_SIGNOFF | Sent when someone signoff the SILC network. The 'signoff_message' may be NULL. The 'leaving_client' SilcClientEntry may be incomplete and contain NULL pointers, application must check it's pointers before attempting to display for example nickname information. | SilcClientEntry signoff_client, char *signoff_message
SILC_NOTIFY_TYPE_TOPIC_SET | Sent when the topic of a channel is set/changed. The 'setter_id_type' is used to check what type of pointer the 'setter_entry' is. For SILC_ID_CLIENT SilcClientEntry, for SILC_ID_SERVER SilcServerEntry and for SILC_ID_CHANNEL SilcChannelEntry. | SilcIdType setter_id_type, void *setter_entry, char *topic, SilcChannelEntry channel
SILC_NOTIFY_TYPE_NICK_CHANGE | Sent when someone changes their nickname. The 'old_client_entry' includes the old nickname and the 'new_client_entry' includes the new nickname. Application must understand that the 'old_client_entry' pointer becomes invalid after returning from the function. Note that this notify is not delivered when user changes its own nickname. | SilcClientEntry old_client_entry, SilcClientEntry new_client_entry
SILC_NOTIFY_TYPE_CMODE_CHANGE | Sent when channel's mode has changed. The 'changer_id_type' is used to check what type of pointer the 'changer_entry' is. For SILC_ID_CLIENT SilcClientEntry, for SILC_ID_SERVER SilcServerEntry and for SILC_ID_CHANNEL SilcChannelEntry. The 'mode' is the mode mask after the change. The `cipher_name' is the cipher set for the channel. The `hmac_name' is the HMAC set for the channel. The `passphrase' is the passphrase that was set for the channel. The `founder_key' is the founder's public key when it was set for the channel. The `channel_pubkeys' is an Argument List Payload where each argument is Public Key Payload containing one channel public key. The arguments 'cipher_name', 'hmac_name', 'passphrase', 'founder_key' and 'channel_pubkeys' may be NULL. | SilcIdType changer_id_type, void *changer_entry, SilcUInt32 mode, char *cipher_name, char *hmac_name, char *passphrase, SilcPublicKey founder_key, SilcBuffer channel_pubkeys, SilcChannelEntry channel
SILC_NOTIFY_TYPE_CUMODE_CHANGE | Sent when a users mode on a channel has changed. The 'changer_id_type' is used to check what type of pointer the 'changer_entry' is. For SILC_ID_CLIENT SilcClientEntry, for SILC_ID_SERVER SilcServerEntry and for SILC_ID_CHANNEL SilcChannelEntry. The 'mode' is the mode mask after the change. The 'target_client' is the client whose mode was changed. | SilcIdType changer_id_type, void *changer_entry, SilcUInt32 mode, SilcClientEntry target_client, SilcChannelEntry channel
SILC_NOTIFY_TYPE_MOTD | Message of the Day from the server. | char *motd
SILC_NOTIFY_TYPE_CHANNEL_CHANGE | Sent when a channel's Channel ID changes. It is possible that channel's ID changes and this notify is sent by the server when this happens. Usually application does not need to handle this notify type and may safely ignore it when received. | SilcChannelEntry channel
SILC_NOTIFY_TYPE_SERVER_SIGNOFF | Sent when a server quits the network. The 'clients' is an array SilcClientEntry pointers of size of 'clients_count'. Each client in the entry is one client signing off from the SILC network. | NULL, SilcClientEntry *clients, SilcUInt32 clients_count
SILC_NOTIFY_TYPE_KICKED | Sent when a client (possibly our client) is kicked from a channel. The 'kick_message' may be NULL. If our client was kicked then 'kicked' is our local SilcClientEntry pointer. | SilcClientEntry kicked, char *kick_message, SilcClientEntry kicker, SilcChannelEntry channel
SILC_NOTIFY_TYPE_KILLED | Sent when a client (possibly our client) is killed from the network. The 'kill_message' may be NULL. If our client was killed then 'killed' is our local SilcClientEntry pointer. The 'killer_type' is used to check what type of pointer the 'killer' is. For SILC_ID_CLIENT SilcClientEntry, for SILC_ID_SERVER SilcServerEntry and for SILC_ID_CHANNEL SilcChannelEntry. | SilcClientEntry killed, char *kill_message, SilcIdType killer_type, void *killer, SilcChannelEntry channel
SILC_NOTIFY_TYPE_ERROR | Sent when an error occurs while handling some operation (except command) from the client. Application usually cannot handle this notify type and may safely ignore it. | SilcStatus error
SILC_NOTIFY_TYPE_WATCH | Sent to notify some status change of a client we are wathing. The SILC_COMMAND_WATCH is used to manage clients we are wathing and this notify type is used to deliver information about that client. If the client just changed nickname the 'new_nickname' includes the new nickname. Otherwise this pointer is NULL. The 'user_mode' is the client's mode in the SILC network. The 'notification' contains the notify type that happened for the 'watched_client' (for example SILC_NOTIFY_TYPE_NICK_CHANGE if the client changed their nickname). | SilcClientEntry watched_client, char *new_nickname, SilcUInt32 user_mode, SilcNotifyType notification, SilcPublicKey public_key

SILC protocol defines some additional notify types but those notify types are not delivered to the application. Some of those notify types are only delivered between servers and routers and clients never receive them. Only the notify types listed above are delivered to application.