Aligned allocation

align_alloc.c

@@ -0,0 +1,37 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define ALLOC_SZ 128
+
+int main(void) {
+    /* glibc defaults to 16 byte alignment with regular malloc on x86_64, and 8 byte for x86 */
+    char *mem = aligned_alloc(32, ALLOC_SZ);
+    char *mem2 = NULL;
+
+    int memalign_status = posix_memalign((void **)&mem2, ALLOC_SZ, ALLOC_SZ);
+    assert(memalign_status != ENOMEM);
+    assert(memalign_status != EINVAL); // Fails on non-power-of-two alignment
+
+    char *mem3 = valloc(getpagesize());
+    int   pgsize = getpagesize();
+    printf("Page size: %d\n", pgsize);
+
+    memset(mem, 'B', ALLOC_SZ);
+    memset(mem2, 'C', ALLOC_SZ);
+    memset(mem3, 'A', getpagesize());
+
+    assert((uintptr_t)mem3 % 4096 == 0);
+    assert((uintptr_t)mem2 % 128 == 0);
+    assert((uintptr_t)mem % 32 == 0);
+
+    free(mem);
+    free(mem2);
+    free(mem3);
+
+    printf("Passed!\n");
+}