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Is it better to modify existing getaddrinfo API or ha= ve a similar API to it?? And can I make changes to glibc and if yes, is there any reference or proce= dure to do that?? Thanks, Rahul -----Original Message----- From: Florian Weimer [mailto:fweimer@redhat.com] Sent: Wednesday, May 05, 2021 2:10 PM To: JOSHI, RAHUL via Libc-help Cc: JOSHI, RAHUL Subject: Re: Having TTL of resolved IP addresses in 'getaddrinfo' or 'getad= drinfo_a' * RAHUL via Libc-help JOSHI: > Hi all, in current implementation of 'getaddrinfo' or 'getaddrinfo_a' > , the TTL(expiry time) of resolved IP addresses isn't provided. Is=20 > there any alternate API in libc which will provide resolved IP=20 > addresses along with TTL?? > > If no, what needs to be done to get the resolved addresses along with=20 > TTL?? We can't put the TTL directly into struct addrinfo because we shouldn't cha= nge its size. We'd have to add an accessor function and change the way get= addrinfo allocates the result list. Fortunately, there is a freeaddrinfo f= unction, so we can maintain a data structure on the side that keeps track o= f TTLs, for use by the accessor function. It's not super-hard, but also not exactly trivial, either. I'm not aware o= f anyone working on this feature, but it is requested from time to time, so= it would be a nice addition to glibc. Thanks, Florian