Module nix::sys::socket::sockopt [−][src]
Expand description
Socket options as used by setsockopt and getsockopt.
Structs
Returns a value indicating whether or not this socket has been marked to
accept connections with listen(2).
Bind this socket to a particular device like “eth0”.
Set or get the broadcast flag.
Join a multicast group
Leave a multicast group.
If enabled, this boolean option allows binding to an IP address that is nonlocal or does not (yet) exist.
Set or read a boolean integer argument that determines whether sent multicast packets should be looped back to the local sockets.
Set or read the time-to-live value of outgoing multicast packets for this socket.
Setting this boolean option enables transparent proxying on this socket.
Pass an IP_PKTINFO ancillary message that contains a pktinfo
structure that supplies some information about the incoming packet.
Enable extended reliable error message passing.
Set or retrieve the current time-to-live field that is used in every packet sent from this socket.
Join an IPv6 multicast group.
Leave an IPv6 multicast group.
Control receiving of asynchronous error options.
Set delivery of the IPV6_PKTINFO control message on incoming
datagrams.
Set the unicast hop limit for the socket.
The socket is restricted to sending and receiving IPv6 packets only.
Enable sending of keep-alive messages on connection-oriented sockets.
When enabled, a close(2) or shutdown(2) will not return until all queued messages for the socket have been successfully sent or the linger timeout has been reached.
Set the mark for each packet sent through this socket (similar to the netfilter MARK target but socket-based).
If this option is enabled, out-of-band data is directly placed into the receive data stream.
Enable or disable the receiving of the SCM_CREDENTIALS control
message.
Return the credentials of the foreign process connected to this socket.
Sets or gets the maximum socket receive buffer in bytes.
Using this socket option, a privileged (CAP_NET_ADMIN) process can
perform the same task as SO_RCVBUF, but the rmem_max limit can be
overridden.
Specify the receiving timeout until reporting an error.
Enable or disable the receiving of the SO_TIMESTAMP control message.
Enable or disable the receiving of the SO_TIMESTAMPNS control message.
Enables local address reuse
Permits multiple AF_INET or AF_INET6 sockets to be bound to an identical socket address.
Indicates that an unsigned 32-bit value ancillary message (cmsg) should be attached to received skbs indicating the number of packets dropped by the socket since its creation.
Specify the sending timeout until reporting an error.
Sets or gets the maximum socket send buffer in bytes.
Using this socket option, a privileged (CAP_NET_ADMIN) process can
perform the same task as SO_SNDBUF, but the wmem_max limit can be
overridden.
Gets the socket type as an integer.
Get and clear the pending socket error.
This option allows the caller to set the TCP congestion control algorithm to be used, on a per-socket basis.
The maximum number of keepalive probes TCP should send before dropping the connection.
The time (in seconds) the connection needs to remain idle before TCP starts sending keepalive probes
The time (in seconds) between individual keepalive probes.
The maximum segment size for outgoing TCP packets.
Under most circumstances, TCP sends data when it is presented; when outstanding data has not yet been acknowledged, it gathers small amounts of output to be sent in a single packet once an acknowledgement is received. For a small number of clients, such as window systems that send a stream of mouse events which receive no replies, this packetization may cause significant delays. The boolean option TCP_NODELAY defeats this algorithm.
Specifies the maximum amount of time in milliseconds that transmitted data may remain unacknowledged before TCP will forcibly close the corresponding connection