GETDNS_CONTEXT_SET_CONTEXT_UPDATE_CALLBACK(3)

✨ getdns_context_set_context_update_callback — bestie, you get told when the context changes ✨

okay so this is a page from the DNS Resolver library manual, specifically getdns_context_set_context_update_callback(3) — the "hey bestie, something moved" hotline for your getdns context. 🎀

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🌸 NAME 🌸

getdns_context_set_context_update_callback — get informed on getdns context updates 💅

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📚 LIBRARY 📚

DNS Resolver library (libgetdns, -lgetdns) 🫶

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✨ SYNOPSIS ✨

#include <getdns.h>

getdns_return_t
getdns_context_set_context_update_callback (getdns_context ** context,
   void (*cbfun)(getdns_context *context, getdns_context_code_t
   changed_item)

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💖 DESCRIPTION 💖

So here's the tea ☕: stuff about your context can change behind your back — think system files that affect the context like /etc/resolv.conf etc. — and when that happens, getdns calls the callback function you passed in as cbfun. That's it. That's the whole vibe. You get notified, no cap. 🔥

• context — a previously initialized context. Like, you gotta have made it already, bestie, we're not conjuring it out of thin air 🧚
• cbfun — the callback function that gets invoked when the specified context changes. And if this argument is NULL, then updates to the context will not invoke a callback. So passing NULL is the "do not disturb" mode of this whole situation. 💀

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⭐ RETURN VALUES ⭐

When everything goes right, each of these functions returns GETDNS_RETURN_GOOD — slay, we love a clean return. 👑

Otherwise, these error values come back at you:

• GETDNS_RETURN_GENERIC_ERROR — memory allocation failed, or some other untoward thing happened 😭 like genuinely not the moment
• GETDNS_RETURN_BAD_CONTEXT — if the context pointer is invalid 🙈 that pointer is not giving what it's supposed to give

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🦋 EXAMPLES 🦋

TBD — yes bestie, the examples are literally "to be determined". The authors left us on read. 🍓

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🔍 SEE ALSO 🔍

• libgetdns(3)
• getdns_context_create(3)
• getdns_context_set(3)
• getdns_context_set_context_update_callback(3)

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and that's the whole page, periodt. 🌈 This little love letter came to you from getdns 1.7.3, dated December 2 — shoutout to the getdns girlies for keeping the docs cute. 💜 mwah, go initialize your context responsibly. 🎀✨