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Example : If 2 addresses have been resolved, then the allocation for result should be 2 * sizeof(addrinfo) + allocate memory for TTL Is my understanding correct?? Thanks, Rahul -----Original Message----- From: JOSHI, RAHUL=20 Sent: Wednesday, May 05, 2021 3:11 PM To: 'Florian Weimer' Cc: 'libc-help@sourceware.org' ; 'libc-alpha@sour= ceware.org' Subject: RE: Having TTL of resolved IP addresses in 'getaddrinfo' or 'getad= drinfo_a' -----Original Message----- From: JOSHI, RAHUL Sent: Wednesday, May 05, 2021 2:26 PM To: Florian Weimer Subject: RE: Having TTL of resolved IP addresses in 'getaddrinfo' or 'getad= drinfo_a' Thanks Weimer for the response, I did look into the glibc code and the TTL = is already calculated(as minimum TTL value among list of resolved addresses= ) by some of the API but not accessed by 'getaddrinfo' (passed NULL as argu= ment to TTL pointer). 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