elisp: Network Servers
36.15 Network Servers
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You create a server by calling ‘make-network-process’ (
Network
Processes) with ‘:server t’. The server will listen for connection
requests from clients. When it accepts a client connection request,
that creates a new network connection, itself a process object, with the
following parameters:
• The connection’s process name is constructed by concatenating the
server process’s NAME with a client identification string. The
client identification string for an IPv4 connection looks like
‘<A.B.C.D:P>’, which represents an address and port number.
Otherwise, it is a unique number in brackets, as in ‘<NNN>’. The
number is unique for each connection in the Emacs session.
• If the server has a non-default filter, the connection process does
not get a separate process buffer; otherwise, Emacs creates a new
buffer for the purpose. The buffer name is the server’s buffer
name or process name, concatenated with the client identification
string.
The server’s process buffer value is never used directly, but the
log function can retrieve it and use it to log connections by
inserting text there.
• The communication type and the process filter and sentinel are
inherited from those of the server. The server never directly uses
its filter and sentinel; their sole purpose is to initialize
connections made to the server.
• The connection’s process contact information is set according to
the client’s addressing information (typically an IP address and a
port number). This information is associated with the
‘process-contact’ keywords ‘:host’, ‘:service’, ‘:remote’.
• The connection’s local address is set up according to the port
number used for the connection.
• The client process’s plist is initialized from the server’s plist.
Info Catalog
elisp: Network
elisp: Processes
elisp: Datagrams