What is getaddrinfo used for?

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.

Is getaddrinfo a Posix?

The getaddrinfo() and getnameinfo() functions are part of the POSIX standard application programming interface (API) for converting domain name system (DNS) hostnames and IP addresses between their human-readable text representations and structured binary formats for the operating system’s networking API.

What is af_ unspec?

The value AF_UNSPEC indicates that getaddrinfo() should return socket addresses for any address family (either IPv4 or IPv6, for example) that can be used with node and service. Specifying 0 in this field indicates that socket addresses of any type can be returned by getaddrinfo().

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 getaddrinfo failure?

It most likely means the hostname can’t be resolved. import socket socket.getaddrinfo(‘localhost’, 8080) If it doesn’t work there, it’s not going to work in the Bottle example. You can try ‘127.0. 0.1’ instead of ‘localhost’ in case that’s the problem.

Is getaddrinfo thread safe?

4 Answers. getaddrinfo() is indeed thread-safe. This is required by RFC 3493 Section 6.1: Functions getaddrinfo() and freeaddrinfo() must be thread-safe.

What is Addrinfo?

Description: The addrinfo structure describes address information for use with TCP/IP. To get this information, call getaddrinfo(); to free a linked list of these structures, call freeaddrinfo(). The addrinfo structure includes these members: ai_flags.

What is Gaierror?

It means that your given host name ‘ ‘ is invalid (gai stands for getaddrinfo() ). As NPE already states, maybe an empty string ” would be more appropriate than a space ‘ ‘ .

How does the getaddrinfo function in Win32 work?

The getaddrinfo function returns results for the NS_DNS namespace. The getaddrinfo function aggregates all responses if more than one namespace provider returns information. For use with the IPv6 and IPv4 protocol, name resolution can be by the Domain Name System (DNS), a local hosts file, or by other naming mechanisms for the NS_DNS namespace.

Which is the Unicode version of the getaddrinfo function?

When UNICODE or _UNICODE is defined, GetAddrInfo is defined to GetAddrInfoW, the Unicode version of the function, and ADDRINFOT is defined to the addrinfoW structure.

What is the value for AF _ unspec in getaddrinfo?

The value AF_UNSPEC indicates that getaddrinfo () should return socket addresses for any address family (either IPv4 or IPv6, for example) that can be used with node and service. ai_socktype This field specifies the preferred socket type, for example SOCK_STREAM or SOCK_DGRAM.

Where is the sorting function in getaddrinfo?

The sorting function used within getaddrinfo () is defined in RFC 3484; the order can be tweaked for a particular system by editing /etc/gai.conf (available since glibc 2.5).

What is getaddrinfo used for? 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. Is getaddrinfo a Posix? The getaddrinfo() and getnameinfo()…