On Thu, 23 Apr 2015 09:52:56 +0800, æ??å?¬äº® said: > I'm looking for that whether the object allocated by malloc is the > multiple of certain bytes! > Or how does the malloc allocate dynamic memory ?? > I does an experiment in my computer! 1) malloc() is a userspace function, not kernel. 2) There are multiple malloc() implementations out there - the one you're using is *probably* glibc's, but there are others (including debugging memory allocators that return strictly the number of bytes allocated, with canaries on either end to trap misuse of memory). > But the result has no feature about a ,b ,c! What do you mean by "no feature", and what were you expecting? When I run it, I get: % ./a.out a = f35010 b = f35040 c = f35070 which tells me that malloc() returned 3 pointers that are 48 bytes apart (which is *not* the same thing as "there are 48 bytes safe to use").
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