What are the common socket errors?

Common socket errors include ECONNREFUSED, ECONNABORTED, ENOTCONN, EFAULT, EINVAL, EISCONN, ESOCKTNOSUPPORT, EADDRINUSE, EADDRNOTAVAIL, EWOULDBLOCK, EINPROGRESS, EALREADY, ECONNRESET, ETIMEDOUT, EHOSTUNREACH, etc.

Common socket errors mainly include the following:

1. ECONNREFUSED: The connection was refused. This is usually because the target host is not listening on the specified port, or a firewall is blocking the connection.

2. ECONNABORTED: The connection was interrupted. This could be due to a network outage, the target host actively disconnecting, or the application actively disconnecting.

3. ENOTCONN: Connection not established. This is usually because the socket has been closed or the connection has not been established before trying to connect.

4. EFAULT: Invalid address. This means that when the socket function was called, the address passed to the function was invalid.

5. EINVAL: Invalid parameter. This means that when calling the socket function, the arguments passed to the function were invalid.

6. EISCONN: Already connected. This means that the socket has established a connection, but when the connect function is called again, this error will be returned.

7. ESOCKTNOSUPPORT: Unsupported socket type. This indicates that the application attempted to use an unsupported socket type.

8. EADDRINUSE: The address is already in use. This indicates that the application is trying to connect to an address that is already assigned to another socket.

9. EADDRNOTAVAIL: The address is not available. This indicates that the application is trying to connect to an unavailable address.

10. EWOULDBLOCK: The operation will block. This means that when calling the socket function, the operation may block because the socket is set to non-blocking mode.

11. EINPROGRESS: Operation in progress. This indicates that an operation is in progress when the socket function is called.

12. EALREADY:Already exists. This indicates that there is already an operation in progress when the socket function is called.

13. ECONNRESET: The connection was reset. This indicates that the target host actively disconnected.

14. ETIMEDOUT: Timeout. This means that a timeout occurred while trying to connect or receive data.

15. EHOSTUNREACH: The host cannot be reached. This indicates that the target host cannot be reached, either due to a network outage or because the target host does not exist.

These errors can usually be resolved by checking the network connection, checking the socket settings and parameters, and checking the status of the target host.

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