The caller:
-1. allocates and clears (memset(&chld, '0', sizeof(chld));) a
+1. allocates and clears (memset(&chld, 0, sizeof(chld));) a
struct child_process variable;
2. initializes the members;
3. calls start_command();
The caller:
-1. allocates and clears (memset(&asy, '0', sizeof(asy));) a
+1. allocates and clears (memset(&asy, 0, sizeof(asy));) a
struct async variable;
2. initializes .proc and .data;
3. calls start_async();