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Privacy policy. The gethostbyname function retrieves host information corresponding to a host name from a host database. If no error occurs, gethostbyname returns a pointer to the hostent structure described above.
This error should not be interpreted to mean that the name parameter contains a name string that has been validated for a particular protocol an IP hostname, for example.
Since Winsock supports multiple name service providers, a name may potentially be valid for one provider and not accepted by another provider. 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. If the host specified in the name parameter has both IPv4 and IPv6 addresses, only the IPv4 addresses will be returned. The gethostbyname function can only return IPv4 addresses for the name parameter.
The getaddrinfo function and associated addrinfo structure should be used if IPv6 addresses for the host are required or if both IPv4 and IPv6 addresses for the host are required. If the name parameter points to an empty string or name is NULL , the returned string is the same as the string returned by a successful gethostname function call the standard host name for the local computer.
If the name parameter contains a string representation of a legal IPv4 address, then the binary IPv4 address that represents the string is returned in the hostent structure.
The memory for the hostent structure returned by the gethostbyname function 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.
The returned hostent structure must be copied to an application buffer if additional calls are to be made to the gethostbyname or gethostbyaddr functions on the same thread. Otherwise, the return value will be overwritten by subsequent gethostbyname or gethostbyaddr calls on the same thread.
On a side-note, PHP 5. In short, once PHP looks up an address, it may not actually perform another lookup as you may expect. In my particular case I think the problem was a change to resolv. In short, if you change resolv. On another note, it can be a pain when iterating with while loops for example that on failure gethostbyname returns the hostname, rather than FALSE.
If somebody notices a speed-up after the second lookup of the same domain - that's most likely your dns-cache itself, not some php-internal dns-cache. This is the best method I've come up with to resolve any host-name to ip-address, it's quick and reliable and has support for timeout!
It works only with unix though. Just a heads up. I was using this function on my site to verify email host addresses. I thought all was good, until a potential client contacted me and said they couldn't sign up correctly. They have a valid email address and domain, but this function failed. DEBUG threading. Thread json. Python socket. Project: sagemaker-xgboost-container Author: aws File: tracker. Project: dynamic-training-with-apache-mxnet-on-aws Author: awslabs File: diagnose.
Project: b1tifi Author: mh4x0f File: ssh. Project: The-chat-room Author: 11ze File: client-test2.
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