Added broken code

Makefile

@@ -18,7 +18,7 @@ $(OUT_NAME): $(objs)
 clean:
 	rm -f *.o $(OUT_NAME)
 
-main.o: main.c
+main.o: main.c alloc_api.h
 	$(CC) $(CFLAGS) -c main.c -o main.o
 
 tree_alloc.o: tree_alloc.c allocator_internal.h

alloc_api.h

@@ -0,0 +1,13 @@
+
+#include <stdint.h>
+
+struct Arena {
+  void *root_freespace;
+  void *root_treealloc;
+  void *(*get_new_region)(uintptr_t);
+  void (*error)(char*);
+};
+
+void unalloc(struct Arena *arena, void *addr);
+void *alloc(struct Arena *arena, uintptr_t size, uintptr_t align);
+

main.c

@@ -1,6 +1,30 @@
 #include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include "alloc_api.h"
+
+void *get_new_region(uintptr_t size) {
+  void *m = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  if (m == MAP_FAILED) {
+    return 0;
+  }
+  return m;
+}
+
+void error(char *msg) {
+  printf("=== ALLOCATOR ERROR ===\n%s\n====== END ERROR ======\n", msg);
+}
 
 int main() {
 	printf("Hello, World!\n");
+  struct Arena arena = {
+    NULL,
+    NULL,
+    get_new_region,
+    error,
+  };
 	return 0;
 }