Implement process clone trampoline

libprocess/process.c

@@ -7,11 +7,32 @@
 #include <stdint.h>
 #include <system.h>
 
-int process_spawn (process_func_t func, void* argument_ptr) {
+void _clone_tramp (void);
+
+struct process_data* process_spawn (process_func_t func, void* argument_ptr) {
   void* stack = malloc (STACK_SIZE);
   if (stack == NULL)
-    return -ST_OOM_ERROR;
+    return NULL;
+
+  struct process_data* pdata = malloc (sizeof (*pdata));
+
+  if (pdata == NULL) {
+    free (stack);
+    return NULL;
+  }
+
+  pdata->arg_ptr = argument_ptr;
+  pdata->fn = func;
 
   uintptr_t top = (uintptr_t)stack + STACK_SIZE;
-  return clone (top, func, argument_ptr);
+  int pid = clone (top, &_clone_tramp, (void*)pdata);
+
+  if (pid < 0) {
+    free (stack);
+    free (pdata);
+    return NULL;
+  }
+
+  pdata->pid = pid;
+  return pdata;
 }