Fix attaching uprobes - replace bad characters in path with '_'

src/attached_probe.cpp

 #include <iostream>
-#include <tuple>
+#include <regex>
 #include <sys/utsname.h>
+#include <tuple>
 #include <unistd.h>
 
 #include "attached_probe.h"
@@ -100,12 +101,17 @@ std::string AttachedProbe::eventname() const
     case ProbeType::uprobe:
     case ProbeType::uretprobe:
       offset_str << std::hex << offset();
-      return eventprefix() + probe_.path + "_" + offset_str.str();
+      return eventprefix() + sanitise(probe_.path) + "_" + offset_str.str();
     default:
       abort();
   }
 }
 
+std::string AttachedProbe::sanitise(const std::string &str)
+{
+  return std::regex_replace(str, std::regex("[^A-Za-z0-9_]"), "_");
+}
+
 uint64_t AttachedProbe::offset() const
 {
   bcc_symbol sym;

src/attached_probe.h

@@ -20,6 +20,7 @@ public:
 private:
   std::string eventprefix() const;
   std::string eventname() const;
+  static std::string sanitise(const std::string &str);
   uint64_t offset() const;
   void load_prog();
   void attach_kprobe();