The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2003 Edition
Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.

NAME

posix_memalign - aligned memory allocation (ADVANCED REALTIME)

SYNOPSIS

[ADV] [Option Start] #include <stdlib.h>

int posix_memalign(void **
memptr, size_t alignment, size_t size); [Option End]

DESCRIPTION

The posix_memalign() function shall allocate size bytes aligned on a boundary specified by alignment, and shall return a pointer to the allocated memory in memptr. The value of alignment shall be a multiple of sizeof( void *), that is also a power of two. Upon successful completion, the value pointed to by memptr shall be a multiple of alignment.

[CX] [Option Start] The free() function shall deallocate memory that has previously been allocated by posix_memalign(). [Option End]

RETURN VALUE

Upon successful completion, posix_memalign() shall return zero; otherwise, an error number shall be returned to indicate the error.

ERRORS

The posix_memalign() function shall 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.

The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

The posix_memalign() function is part of the Advisory Information option and need not be provided on all implementations.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

free() , malloc() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

CHANGE HISTORY

First released in Issue 6. Derived from IEEE Std 1003.1d-1999.

In the SYNOPSIS, the inclusion of <sys/types.h> is no longer required.

End of informative text.


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