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Allocate aligned memory
#include <stdlib.h>
int posix_memalign( void ** memptr,
size_t alignment,
size_t size );
- memptr
- A pointer to a location where posix_memalign() can store
a pointer the memory.
- alignment
- The alignment to use for the memory.
This must be a multiple of size( void * ).
- size
- The size, in bytes, of the block to allocate.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The posix_memalign() function allocates size bytes
aligned on a boundary specified by alignment.
It returns a pointer to the allocated memory in memptr.
The buffer allocated by posix_memalign()
is contiguous in virtual address space, but not physical memory.
Since some platforms don't allocate memory in 4 KB page sizes,
you shouldn't assume that the memory allocated will be physically contiguous
if you specify a size of 4 KB or less.
You can obtain the physical address of the start of the buffer using
mem_offset()
with fd=NOFD.
- 0
- Success.
- -1
- An error occurred
(errno
is set).
- EINVAL
- The value of alignment isn't a multiple of
size( void * ).
- ENOMEM
- There's insufficient memory available with the requested alignment.
POSIX 1003.1 ADV
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
errno,
free(),
malloc(),
memalign()
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