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POSIX_MEMALIGN(3) Library Functions Manual POSIX_MEMALIGN(3)

posix_memalignaligned memory allocation

#include <stdlib.h>

posix_memalign(void **ptr, size_t alignment, size_t size);

The () function allocates size bytes of memory such that the allocation's base address is a multiple of alignment, and returns the allocation in the value pointed to by ptr.

The requested alignment must be a power of 2 at least as large as (void *).

Memory that is allocated via () can be used as an argument in subsequent calls to realloc(3), reallocarray(3) and free(3), but not recallocarray(3) and freezero(3).

The posix_memalign() function returns the value 0 if successful; otherwise it returns an error value.

The posix_memalign() function will fail if:

The alignment parameter is not a power of 2 at least as large as sizeof(void *).
Memory allocation error.

free(3), malloc(3), realloc(3)

The posix_memalign() function conforms to IEEE Std 1003.1-2001 (“POSIX.1”).

The posix_memalign() function first appeared in OpenBSD 4.8.

May 13, 2017 OpenBSD-6.3