POSIX_MEMALIGN(3C)POSIX_MEMALIGN(3C)NAMEposix_memalign - aligned memory allocation
SYNOPSIS
#include <sys/mman.h>
int posix_memalign(void **memptr, size_t alignment, size_t size);
DESCRIPTION
The posix_memalign() function allocates size bytes aligned on a bound‐
ary specified by alignment, and returns a pointer to the allocated mem‐
ory in memptr. The value of alignment must be a power of two multiple
of sizeof(void *).
Upon successful completion, the value pointed to by memptr will be a
multiple of alignment.
If the size of the space requested is 0, the value returned in memptr
will be a null pointer.
The free(3C) function will deallocate memory that has previously been
allocated by posix_memalign().
RETURN VALUES
Upon successful completion, posix_memalign() returns zero. Otherwise,
an error number is returned to indicate the error.
ERRORS
The posix_memalign() function will fail if:
EINVAL
The value of the alignment parameter is not a power of two
multiple of sizeof(void *).
ENOMEM
There is insufficient memory available with the requested
alignment.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬───────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼───────────────────┤
│Interface Stability │ Committed │
├────────────────────┼───────────────────┤
│MT-Level │ MT-Safe │
├────────────────────┼───────────────────┤
│Standard │ See standards(5). │
└────────────────────┴───────────────────┘
SEE ALSOfree(3C), malloc(3C), memalign(3C), attributes(5), standards(5)
Jul 14, 2008 POSIX_MEMALIGN(3C)
