socket.getsockopt

socket.getsockopt(level, option)

  • This function returns the value of a socket option

  • The level defines the level of the option

    • It is SOL_SOCKET for socket-level options
    • It is IPPROTO_IP for protocol-related options
  • The optname selects a specific option

  • The following are the socket options:

    • SOL_SOCKET: The option is defined at the socket level
    • IPPROTO_IP: The option is defined at the IP protocol level

Some Socket Options for SOL_SOCKET

Option Name Value Description
SO_ACCEPTCONN 0,1 Is the socket accepting connections?
SO_ERROR int Gets error status.
SO_KEEPALIVE 0,1 Is there a keepalive probe?
SO_TYPE int Gets socket type.

Some Socket Options for IPPROTO_IP

Option Name Value Description
IP_HDRINCL int Gets IP header included with data.
IP_RECVDSTADDR 0,1 Receive all IP options with datagram.
IP_TOS int Gets type of service.
IP_TTL int Gets time-to-live.

Example of getsockopt

>>> import socket
>>> sock = socket(AF_INET, SOCK_STREAM)
>>> sock.getsockopt(sock.SOL_SOCKET, sock.SO_REUSEADDR)
1

References

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socket.getpeername

socket.listen

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