POSIX_MEMALIGN(3)

NAME
posix_memalign - aligned memory allocation

LIBRARY
libc

SYNOPSIS
#include <stdlib.h>
int
posix_memalign(void **ptr, size_t alignment, size_t size);

DESCRIPTION
The posix_memalign() function allocates size bytes of memory such that the allocation's base address is an even 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 sizeof(void *).

Memory that is allocated via posix_memalign() can be used as an argument in subsequent calls to realloc(3), reallocf(3), and free(3).

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

ERRORS
The posix_memalign() function will fail if:

[EINVAL]
    The alignment parameter is not a power of 2 at least as large as sizeof(void *).

[ENOMEM]
    Memory allocation error.

SEE ALSO
free(3), malloc(3), realloc(3), reallocf(3), valloc(3)

STANDARDS
The posix_memalign() function conforms to p1003.1-2001.

HISTORY
The posix_memalign() function first appeared in FreeBSD 7.0.