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important: payload should be aligned. (i.e., begin on multiple of alignment size). - usually means that header & block also be aligned. e.g., Linux requires 8-byte The address of a block returned by malloc or realloc in GNU systems is always a multiple of eight Function: void * aligned_alloc (size_t alignment , size_t size ). The malloc() and calloc() functions return a pointer to the allocated memory that is suitably aligned for any kind of variable. On error, these functions return NULL. It has been tested most extensively on Solaris and Linux. People also report .. (If you'd like to. install such a thing yourself, cut out the preliminary declarations . 8-byte alignment is guaranteed by normal malloc calls, so don't. bother callingMalloc tutorial Diagram of linux memory layout, courtesy of Gustavo Duarte. . void *malloc(size_t size) { struct block_meta *block; // TODO: align size? if (size Read aligned_alloc man page on Linux: $ man 3 aligned_alloc size_t size); void *valloc(size_t size); #include void *memalign(size_t alignment, 26 Aug 2008 The only way to guarantee alignment is by doing such alignment yourself. In new [for non-POD types], you'd have to first allocate a sufficiently MALLOC(3) Linux Programmer's Manual MALLOC(3) calloc() functions return a pointer to the allocated memory, which is suitably aligned for any built-in type. 29 Jun 2016 You need an offset if you want to support alignments beyond what your system's malloc() does. For example if your system malloc() aligns to 8 22 Jul 2013 To complicate matters, there's a minimum block size that can be returned by malloc . Alignment is one reason. If there's an integer size secretly