What is Setsockopt used for?

Remarks. The setsockopt function sets the current value for a socket option associated with a socket of any type, in any state. Although options can exist at multiple protocol levels, they are always present at the uppermost socket level.

What is So_rcvlowat?

SO_RCVLOWAT. Sets the minimum number of bytes to process for socket input operations. The default value for SO_RCVLOWAT is 1. If SO_RCVLOWAT is set to a larger value, blocking receive calls normally wait until they have received the smaller of the low water mark value or the requested amount.

What is Setsockopt function in Linux?

The setsockopt() function provides an application program with the means to control socket behavior. An application program can use setsockopt() to allocate buffer space, control timeouts, or permit socket data broadcasts. The header defines the socket-level options available to setsockopt().

What does Setsockopt return?

Upon successful completion, setsockopt() shall return 0. Otherwise, -1 shall be returned and errno set to indicate the error.

What is Inaddr_any?

This is an IP address that is used when we don’t want to bind a socket to any specific IP. Basically, while implementing communication, we need to bind our socket to an IP address. When we don’t know the IP address of our machine, we can use the special IP address INADDR_ANY .

What is So_keepalive?

The SO_KEEPALIVE socket option is designed to allow an application to enable keep-alive packets for a socket connection. To query the status of this socket option, call the getsockopt function. To set this option, call the setsockopt function with the following parameters.

What is Ipproto_ip?

IPPROTO_IP creates a socket that sends/receives raw data for IPv4-based protocols (TCP, UDP, etc). It will handle the IP headers for you, but you are responsible for processing/creating additional protocol data inside the IP payload.

What is Sol_socket?

SOL_SOCKET is the socket layer itself. It is used for options that are protocol independent.

What is socket Sock_dgram?

SOCK_DGRAM. User Datagram Protocol (UDP) The datagram socket (SOCK_DGRAM) interface defines a connectionless service for datagrams, or messages. Datagrams are sent as independent packets. The reliability is not guaranteed, data can be lost or duplicated, and datagrams can arrive out of order.

What is So_sndbuf?

SO_SNDBUF int Specifies the total per-socket buffer space reserved for sends.

What is Ip_pktinfo?

IP_PKTINFO (since Linux 2.2) Pass an IP_PKTINFO ancillary message that contains a pktinfo structure that supplies some information about the incoming packet. This works only for datagram oriented sockets. The argument is a flag that tells the socket whether the IP_PKTINFO message should be passed or not.

What is Keepaliveinterval?

The Keep Alive Interval setting in the TCP profile is used to adjust the frequency at which the BIG-IP system sends TCP Keep-Alive packets to a remote host for connection validation.

What is a Sock_stream?

SOCK_STREAM. Provides sequenced, two-way byte streams with a transmission mechanism for stream data. This socket type transmits data on a reliable basis, in order, and with out-of-band capabilities. In the UNIX domain, the SOCK_STREAM socket type works like a pipe.

What is Ip_tos?

IP_TOS (since Linux 1.0) Set or receive the Type-Of-Service (TOS) field that is sent with every IP packet originating from this socket. It is used to prioritize packets on the network. TOS is a byte.

How do you use keepalive?

Use “KeepAlive On” to enable it. To disable, just use “KeepAlive Off”. It sets the maximum number of requests for every Keep-Alive connection. A value of 100 is normally good enough for almost any scenario.