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netconn struct
sockets currently are built on netconns, each socket has one netconn
Fields
Field
Declared as
Description
timeout to wait for sending data (which means enqueueing data for sending in internal buffers) in milliseconds.
timeout in milliseconds to wait for new data to be received (or connections to arrive for listening netconns).
TCP: when data passed to netconn_write doesn't fit into the send buffer, this temporarily stores the message. Also used during connect and close.
A callback function that is informed about events for this netconn.
the lwIP internal protocol control block.
mbox where received packets are stored until they are fetched by the netconn application thread (can grow quite big).
mbox where new connections are stored until processed by the application thread.
int
number of threads waiting on an mbox. This is required to unblock all threads when closing while threads are waiting.
Related Functions
Found 39 other functions taking a netconn
argument:
Function
Description
Get and reset pending error on a netconn
Internal helper function to close a TCP netconn: since this sometimes doesn't work at the first attempt, this function is called from multiple places.
Close or shutdown a TCP netconn (doesn't delete it).
Send data over a UDP or RAW netconn (that is already connected).
Close a netconn 'connection' and free its resources. UDP and RAW connection are completely closed, TCP pcbs might still be in a waitstate after this returns.
Get the local or remote IP address and port of a netconn. For RAW netconns, this returns the protocol instead of a port!
Receive data: actual implementation that doesn't care whether pbuf or netbuf is received (this is internal, it's just here for describing common errors)
Delete a netconn and all its resources. The pcb is NOT freed (since we might not be in the right thread context do this).
See if more data needs to be written from a previous call to netconn_write. Called initially from lwip_netconn_do_write. If the first call can't send all data (because of low memory or empty send-buffer), this function is called again from sent_tcp() or poll_tcp() to send more data. If all data is sent, the blocking application thread (waiting in netconn_write) is released.
Setup a tcp_pcb with the correct callback function pointers and their arguments.
Callback registered in the netconn layer for each socket-netconn. Processes recvevent (data available) and wakes up tasks waiting for select.
Send vectorized data atomically over a TCP netconn.
Close a netconn 'connection' and free all its resources but not the netconn itself. UDP and RAW connection are completely closed, TCP pcbs might still be in a waitstate after this returns.
Delete rcvmbox and acceptmbox of a netconn and free the left-over data in these mboxes
Free a socket (under lock)
Free a socket's leftover members.
Send data over a TCP netconn.
Shut down one or both sides of a TCP netconn (doesn't delete it).
Join multicast groups for UDP netconns.
Join multicast groups for UDP netconns.
Receive data (in form of a pbuf) from a TCP netconn
Receive data (in form of a netbuf) from a UDP or RAW netconn
Accept a new connection on a TCP listening netconn.
Bind a netconn to a specific local IP address and port. Binding one netconn twice might not always be checked correctly!
Connect a netconn to a specific remote IP address and port.
Disconnect a netconn from its current peer (only valid for UDP netconns).
Set a TCP netconn into listen mode
Allocate a new socket for a given netconn.
Close a TCP netconn (doesn't delete it).
Receive data (in form of a pbuf) from a TCP netconn
Receive data (in form of a netbuf) from a UDP or RAW netconn
Receive data (in form of a netbuf containing a packet buffer) from a netconn
Send data (in form of a netbuf) to a specific remote IP address and port. Only to be used for UDP and RAW netconns (not TCP).
Bind a netconn to a specific interface and port. Binding one netconn twice might not always be checked correctly!