What is Freeaddrinfo in C?

What is Freeaddrinfo in C?

General description. The freeaddrinfo() function frees one or more addrinfo structures returned by getaddrinfo(), along with any additional storage associated with those structures. If the ai_next field of the structure is not null, the entire list of structures is freed.

What is Ai_flags?

ai_flags contains the AI_NUMERICHOST flag, then node must be a numerical network address. The AI_NUMERICHOST flag suppresses any potentially lengthy network host address lookups. ai_flags, and node is NULL, then the returned socket addresses will be suitable for bind(2)ing a socket that will accept(2) connections.

What is Ai_family?

ptr->ai_family is just an integer, a member of a struct addrinfo. ( And if you are wondering about the particular syntax of ptr-> , you can go through this question ), it will have a value of either AF_INET or AF_INET6 (Or in theory any other supported protocol)

What is Ai_addr?

ai_addr. Binary socket address. ai_next. A pointer to the next addrinfo structure in the linked list.

How can I get free Addrinfo?

The freeaddrinfo() function shall free one or more addrinfo structures returned by getaddrinfo(), along with any additional storage associated with those structures. If the ai_next field of the structure is not null, the entire list of structures shall be freed.

Does getaddrinfo allocate memory?

freeaddrinfo() This function frees the memory allocated by function getaddrinfo(). As the result of the latter is a linked list of addrinfo structures starting at the address ai, freeaddrinfo() loops through the list and frees each one in turn.

What is the use of getaddrinfo?

The getaddrinfo function can be used to convert a text string representation of an IP address to an addrinfo structure that contains a sockaddr structure for the IP address and other information.

What is getaddrinfo used for?

What is Ai_protocol?

ai_protocol. Used to limit the returned information to a specific protocol. A value of 0 means that the caller accepts any protocol. The following are the acceptable protocols: Protocol Name.

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. When we don’t know the IP address of our machine, we can use the special IP address INADDR_ANY . It allows our server to receive packets that have been targeted by any of the interfaces.

What is Sockaddr_storage?

The SOCKADDR_STORAGE structure stores socket address information. Since the SOCKADDR_STORAGE structure is sufficiently large to store address information for IPv4, IPv6, or other address families, its use promotes protocol-family and protocol-version independence and simplifies cross-platform development.

What does getaddrinfo do in C?

The getaddrinfo() function translates the name of a service location (for example, a host name) and/or service name and returns a set of socket addresses and associated information to be used in creating a socket with which to address the specified service.