What is struct hostent c++?
What is struct hostent c++?
The hostent structure is used by functions to store information about a given host, such as host name, IPv4 address, and so forth.
Which member variable from struct Hostent is used to retrieve the official host name?
The gethostbyname() function returns a structure of type hostent for the given host name. Here name is either a hostname or an IPv4 address in standard dot notation (as for inet_addr(3)).
What is the use of Gethostbyname?
The gethostbyname function returns a pointer to a hostent structure—a structure allocated by Windows Sockets. The hostent structure contains the results of a successful search for the host specified in the name parameter.
How are host names given in a hostent structure?
As far as the host database is concerned, each address is just a block of memory h_length bytes long. But in other contexts there is an implicit assumption that you can convert IPv4 addresses to a struct in_addr or an uint32_t. Host addresses in a struct hostent structure are always given in network byte order; see Byte Order .
What is the length of a hostent address?
The length, in bytes, of each address. A NULL -terminated list of addresses for the host. Addresses are returned in network byte order. The macro h_addr is defined to be h_addr_list [0] for compatibility with older software.
How is the hostent structure allocated in Win32?
The memory for the hostent structure returned by the gethostbyaddr and gethostbyname functions is allocated internally by the Winsock DLL from thread local storage. Only a single hostent structure is allocated and used, no matter how many times the gethostbyaddr or gethostbyname functions are called on the thread.
What are the host names in GNU C?
These are alternative names for the host, represented as a null-terminated vector of strings. This is the host address type; in practice, its value is always either AF_INET or AF_INET6, with the latter being used for IPv6 hosts.