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10.30 aligned_alloc

Documentation:
man aligned_alloc

Gnulib module: aligned_alloc

Portability problems fixed by Gnulib:

• This function fails if the alignment argument is smaller than sizeof (void *) on some platforms: macOS 14, AIX 7.3.1.

Portability problems not fixed by Gnulib:

• On some platforms, aligned_alloc crashes if the requested size is not a multiple of the alignment: AddressSanitizer (gcc 11.2 or clang 13).
• This function is missing on many older platforms: glibc 2.15, macOS 10.14, FreeBSD 6.4, NetBSD 7.1, OpenBSD 6.0, Minix 3.1.8, AIX 7.1, HP-UX 11.31, Solaris 11.3, Cygwin 1.7.x, mingw, MSVC 14, Android 8.1.

Gnulib has partial substitutes for aligned_alloc that do not crash even if the AddressSanitizer bug is present:

• The Gnulib module alignalloc provides a portable function alignalloc that is a near-substitute for glibc aligned_alloc, except that the result must be freed with alignfree rather than plain free.
• The Gnulib module aligned-malloc provides functions for allocating and freeing blocks of suitably aligned memory.
• The Gnulib module pagealign_alloc provides a similar API for allocating and freeing blocks of memory aligned on a system page boundary.