Add build system scaffolding and libc headers

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/libc/stdlib/posix_memalign.c b/lib/libc/stdlib/posix_memalign.c
new file mode 100644
index 00000000..a7cbd2a2
--- /dev/null
+++ b/lib/libc/stdlib/posix_memalign.c
@@ -0,0 +1,31 @@
+#include <errno.h>
+#include <stdlib.h>
+
+int posix_memalign(void **memptr, size_t alignment, size_t size)
+{
+	if (memptr == NULL) {
+		return EINVAL;
+	}
+
+	*memptr = NULL;
+
+	if (alignment < sizeof(void *) || alignment % sizeof(void *) != 0 ||
+	    (alignment & (alignment - 1)) != 0) {
+		return EINVAL;
+	}
+
+	if (size == 0) {
+		*memptr = NULL;
+		return 0;
+	}
+
+	size_t aligned_size = (size + alignment - 1) & ~(alignment - 1);
+
+	void *ptr = aligned_alloc(alignment, aligned_size);
+	if (ptr == NULL) {
+		return ENOMEM;
+	}
+
+	*memptr = ptr;
+	return 0;
+}