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Asked: 2026-06-17T04:49:04+00:00

I was wondering, what is the best way to get the head pointer of

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I was wondering, what is the best way to get the head pointer of the given memory address? In example, if p is allocated at the address 0 with a size of 32 bytes how can I get back to 0 from the address 12? In other words, get back to the “main address” from an address further into its data structure. Is that possible?

Any help is welcome, thanks!

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  1. Editorial Team

    For structs this can be accomplished using container_of macro provided you know its type and you have a pointer to a member of it (ex. to get the pointer of the struct if you are given a pointer to a member). For memory allocations done using malloc this is not possible unless you have the length you’ve traversed or offset you’re currently at.

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