Thanks how can getaddrinfo API be used to populate structures in a protocol-independent way? Show 2 more comments. Active Oldest Votes. Remy Lebeau Remy Lebeau k 29 29 gold badges silver badges bronze badges.
Add a comment. Andrew Henle Andrew Henle Well which is it? It isn't guaranteed or it is? Sign up or log in Sign up using Google. Sign up using Facebook. This is also supported on Windows unix socket implementation. Unix sockets provide a mechanism for secure communication.
C ommunication over unix sockets can be secured by controlling the file or directory permissions on the pathname sockets or the parent directory. The creation of the new socket file will fail if the calling process does not has write permission on the directory where the file is being created. Similarly, for connecting to a stream socket, the connecting process should have write permission on the socket.
The same level of security is available and enforced on the Windows unix socket implementation. The Windows kernel networking stack provides a very pluggable and extensible model, that makes it easy to support new network providers. The socket file itself that is created as part of the bind call is a custom NTFS reparse point.
Summarizing from the above, the following Linux unix socket features are either currently unavailable or unsupported in the Windows unix socket implementation. The same applies to Windows unix sockets , except that, DeleteFile or any other file delete API should be used to delete the socket file prior to calling bind with the same path. An optional pointer to a buffer that receives the address of the connecting entity, as known to the communications layer. The exact format of the addr parameter is determined by the address family that was established when the socket from the sockaddr structure was created.
An optional pointer to an integer that contains the length of structure pointed to by the addr parameter. This returned value is a handle for the socket on which the actual connection is made. The integer referred to by addrlen initially contains the amount of space pointed to by addr. On return it will contain the actual length in bytes of the address returned. The accept function extracts the first connection on the queue of pending connections on socket s.
It then creates and returns a handle to the new socket. The newly created socket is the socket that will handle the actual connection; it has the same properties as socket s , including the asynchronous events registered with the WSAAsyncSelect or WSAEventSelect functions. The accept function can block the caller until a connection is present if no pending connections are present on the queue, and the socket is marked as blocking.
If using a local hosts file, it is the first entry after the IP address. Addresses are returned in network byte order. Table 2. Retrieves the host information corresponding to a network address. The gethostbyaddr function has been deprecated by the introduction of the getnameinfo function.
Developers creating Windows Sockets 2 applications are urged to use the getnameinfo function instead of the gethostbyaddr function. Address family types and their corresponding values are defined in the winsock2. Return value. See below. Include file. The gethostbyaddr function returns a pointer to the hostent structure that contains the name and address corresponding to the given network address. Although gethostbyaddr is deprecated by the getnameinfo function, gethostbyaddr is capable of returning a NetBIOS name; getnameinfo is not.
Note The capability to perform reverse lookups using the gethostbyaddr function is convenient, but such lookups are considered inherently unreliable, and should be used only as a hint. Table 3. Return Values. If no error occurs, gethostbyaddr returns a pointer to the hostent structure. Error code. A successful WSAStartup call must occur before using this function.
The network subsystem has failed. Authoritative answer host not found. Non-authoritative host not found, or server failed. A non-recoverable error occurred.
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