sock_listen()

Listen for connections on a socket.

Description

The sock_listen() function is used to put a socket into a listening state, allowing it to accept incoming connections. This function is similar to the listen function in POSIX, which is used to mark a socket as a passive socket that can accept connections.

When a socket is in the listening state, it can receive connection attempts from remote clients. The socket remains in the listening state until it is closed or the application explicitly stops listening.

Syntax

  ;;; Note: This is similar to `listen`
  ;;;
  ;;; attempt is made
  ;;; Polling the socket handle will wait until a connection
  ;;;
  ;;; Listen for connections on a socket
  (@interface func (export "sock_listen")
    ;;; File descriptor of the socket to be bind
    (param $fd $fd)
    ;;; Maximum size of the queue for pending connections
    (param $backlog $size)
    (result $error (expected (error $errno)))
  )

Parameters

• ctx: A mutable reference to the function environment.
• sock: The file descriptor of the socket to listen on.
• backlog: The maximum size of the queue for pending connections. This parameter specifies the maximum number of connections that can be queued while the socket is waiting for acceptance.

Return Value

The function returns an Errno value indicating the outcome of the operation. If the operation is successful, Errno::Success is returned. If an error occurs, an appropriate Errno value is returned.

Notes

• The sock_listen() function puts a socket into a listening state, allowing it to accept incoming connections.
• The behavior and limitations of the sock_listen() function may vary depending on the specific runtime environment and underlying networking implementation. It is important to consult the documentation or specifications of the specific environment to understand its behavior in that context.
• The backlog parameter determines the maximum number of connections that can be queued while the socket is waiting for acceptance. If the number of pending connections exceeds the backlog value, additional connection attempts may be refused or dropped.
• After calling sock_listen(), the application can use the sock_accept() function to accept incoming connections and establish new sockets for communication with the clients.
• The specific runtime environment may impose additional restrictions on the sock_listen() function, such as limits on the backlog size or other system-specific considerations.