The listen() function marks a connection-mode socket, specified by the socket argument, as accepting connections, and limits the number of outstanding
connections in the socket's listen queue to the value specified by the backlog argument.
If listen() is called with a backlog argument value that is less than 0, the function sets the length of the socket's listen queue to 0.
The implementation may include incomplete connections in the queue subject to the queue limit. The implementation may also increase the specified queue limit internally if it includes such incomplete
connections in the queue subject to this limit.
Implementations may limit the length of the socket's listen queue. If backlog exceeds the implementation-dependent maximum queue length, the length of the socket's listen
queue will be set to the maximum supported value.
The socket in use may require the process to have appropriate privileges to use the listen() function.
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