Fix ptrace returning ENODEV when process exists

src/syscall/process.rs

@@ -1065,6 +1065,8 @@ pub fn fexec(fd: FileHandle, arg_ptrs: &[[usize; 2]], var_ptrs: &[[usize; 2]]) -
 }
 
 pub fn exit(status: usize) -> ! {
+    ptrace::breakpoint_callback(PTRACE_STOP_EXIT, Some(ptrace_event!(PTRACE_STOP_EXIT, status)));
+
     {
         let context_lock = {
             let contexts = context::contexts();
@@ -1072,8 +1074,6 @@ pub fn exit(status: usize) -> ! {
             Arc::clone(&context_lock)
         };
 
-        ptrace::breakpoint_callback(PTRACE_STOP_EXIT, Some(ptrace_event!(PTRACE_STOP_EXIT, status)));
-
         let mut close_files = Vec::new();
         let pid = {
             let mut context = context_lock.write();
@@ -1152,7 +1152,7 @@ pub fn exit(status: usize) -> ! {
         }
 
         // Alert any tracers waiting of this process
-        ptrace::close_session(pid);
+        ptrace::close_tracee(pid);
 
         if pid == ContextId::from(1) {
             println!("Main kernel thread exited with status {:X}", status);