Fixed wrong pid bug

The issue was that the thread ID wasn't factored in. A presumption was,
that FUSE already returned the PID, not TID. The issue was fixed by
implementing a function that translates the TID to PID.

src/process_info.h

@@ -10,7 +10,11 @@
 #define PROCESS_INFO_H
 
 #include "proc_operations.h"
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
 #include <sys/types.h>
+#include <unistd.h>
 struct process_info {
   pid_t PID;
   char *name;
@@ -18,7 +22,7 @@ struct process_info {
 
 static inline struct process_info get_process_info(pid_t pid) {
   struct process_info pi;
-  pi.PID = pid;
+  pi.PID = get_main_thread_pid(pid);
   pi.name = get_process_name_by_pid(pi.PID);
   if (pi.name == NULL) {
     pi.PID = 0;