WHAT-IS: client versa server

Table Of Contents

• Definition
• What is a "client" ?
• What is a "server" ?

Definition

client	the part of the software doing the connect system-call
server	the part of the software doing the accept system-call (e.g. service)

What is a "client" ?

• every new client-parent-context start a new server and creating a server-parent-context
  • client: (C, C++, C#, Java, Python, Tcl, Perl, VB.NET)
  • server: (C, C++, C#, Java, Python, Tcl, Perl, VB.NET)
• every deletion of the client-parent-context stop the previous started server
  
• every client application is able to connect to multiple server, there is a 1:N relationship between client and server.
  In local mode the client start and connect to the server using a PIPE:

  client @ server
  

• in remote mode the client connect to the server is using --tcp or --uds for communication setup:

  client --tcp --hots REMOTE_HOST --port REMOTE_PORT ...    or
  client --uds --file MYFILE ...
  

• the client gets all the error/warning/info messages from the server

What is a "server" ?

In general the server is serving services and is started by the client:

• option --pipe

(this is called the local mode and is the DEFAULT)
or as a standalone:

• option --tcp or --uds together with --fork, --thread or --spawn

(this is called the remote mode)

and is defined if the IServerSetup interface is available (C, C++, C#, Java, Python, Tcl, Perl, VB.NET)

In local mode the client is using everything after the first @ command-line argument as server:

client @ server

but only if the client is using the command-line arguments to configure the MqLinkCreate call:

In remote mode the server is started as standalone with tcp sockets:

server --fork --tcp --port 7777

or uds sockets:

server --fork --uds --file /tmp/myservice_file