Changing malloc function allocation space

Question

Is there a way to change where malloc allocate memory space?

For an example, let's say I want malloc to allocate memory within 0x100000 and 0x500000. How can I do this or is there a way for this without changing the malloc implementation?

Even change the malloc implementation still can't do that,maybe need change system call — Ron Tang, Mar 13 '15 at 07:49
Suspect XY Question - what are you ACTUALLY trying to achieve? Why does heap allocation address matter to you? — Mats Petersson, Mar 13 '15 at 08:46
@MatsPetersson - I'm trying to copy memory segment to another process so that the internal pointers and such will be available as same as they were in the original process. I'm trying to find a faster way than serialization/relocation/etc... . FYI. — Sanka Darshana, Mar 13 '15 at 09:55

score 0 · Answer 1 · edited May 23 '17 at 11:50

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You probably cannot change the behavior of the standard malloc call (aside from runtime substitutions such as via LD_PRELOAD), but for some platforms can write your own (separate) memory allocator using specific addresses with the mmap function call.

edited May 23 '17 at 11:50

Community

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answered Mar 13 '15 at 08:02

Thomas Dickey

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score 0 · Answer 2 · answered Mar 13 '15 at 08:03

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Using malloc allocates memory on the heap.If your question is related to an embedded software, you can often change the heap start address,size and other parameters in the startup file or linker configuration file.

answered Mar 13 '15 at 08:03

user3415290

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Changing malloc function allocation space

2 Answers2