Kernel logs when thread ends

arch/um/include/shared/aha.h

@@ -17,6 +17,7 @@ struct ReplyMessage{
 
 #define EXECVE_MESSAGE 1
 #define CLONE_MESSAGE  2
+#define EXIT_MESSAGE   3 
 #ifdef AHA_DEBUG
     #define AHA_PRINTK(args...) printk(args)
 #else
@@ -30,4 +31,5 @@ void aha_handle_insult_messages(struct ReplyMessage *msg, char __user* file,\
                             char __user* __user* argv);
 void aha_get_reply_message(char* key, struct ReplyMessage *msg);
 void aha_record_sys_clone(int pid, int ppid);
+void aha_dump_exits(void);
 #endif

arch/um/kernel/aha.c

@@ -232,3 +232,33 @@ void aha_record_sys_clone(int pid, int ppid)
     #undef buf__size
 }
 
+/* Tracks if a thread exits, aiming to free up pids in the process trees
+ * Process trees are internally read fronm task_struct
+ */
+void aha_dump_exits(void)
+{
+    int mode = 0644;
+    int fd;
+    struct openflags flg;
+    char filename[32];
+    char qn[64];
+    char buf[16];
+    flg.w = 1;
+    flg.c = 1;
+    if (aha_create_filename((char*)&filename,32)>0){
+        /* Put message in output queue */
+        if (snprintf((char*)&qn,64,"out/%s",filename)>0){
+            if ((fd = os_open_file(qn,flg,mode))>0){
+                __aha_set_type_tag(fd,(char*)&buf,16,EXIT_MESSAGE);
+                __aha_dump_pid_ppids(fd,(char*)&buf,16);
+                __aha_set_done_tag (fd,(char*)&buf,16);
+                os_close_file(fd);
+            }
+        }else{
+            AHA_PRINTK("record-exit: Could not put filename in output queue\n");
+        }
+    }else{
+        AHA_PRINTK("record-exit: No filename could be generated\n");
+    }
+}
+

arch/um/kernel/process.c

@@ -26,6 +26,7 @@
 #include "os.h"
 #include "skas.h"
 #include "tlb.h"
+#include "shared/aha.h"
 
 /*
  * This is a per-cpu array.  A processor only modifies its entry and it only
@@ -123,6 +124,7 @@ void interrupt_end(void)
 
 void exit_thread(void)
 {
+   aha_dump_exits(); 
 }
 
 void *get_current(void)