Compute and pring the time that it takes to execute system calls. This data...

sandbox/linux/seccomp/debug.h

Index: sandbox/linux/seccomp/debug.h
===================================================================
--- sandbox/linux/seccomp/debug.h	(revision 41782)
+++ sandbox/linux/seccomp/debug.h	(working copy)
@@ -31,13 +31,23 @@
 
   // If debugging is enabled, write the name of the syscall and an optional
   // message to stderr.
-  static void syscall(int sysnum, const char* msg, int call = -1)
+  static void syscall(long long* tm, int sysnum,
+                      const char* msg, int call = -1)
   #ifndef NDEBUG
   ;
   #else
   { }
   #endif
 
+  // Print how much wall-time has elapsed since the last call to syscall()
+  static void elapsed(long long tm, int sysnum, int call = -1)
+  #ifndef NDEBUG
+  ;
+  #else
+  {
+  }
+  #endif
+
   // Check whether debugging is enabled.
   static bool isEnabled() {
     #ifndef NDEBUG
@@ -50,12 +60,16 @@
  private:
   #ifndef NDEBUG
   Debug();
+  static bool  enter();
+  static bool  leave();
+  static void  _message(const char* msg);
+  static void  gettimeofday(long long* tm);
   static char* itoa(char* s, int n);
 
   static Debug debug_;
 
   static bool  enabled_;
-  static int  numSyscallNames_;
+  static int   numSyscallNames_;
   static const char **syscallNames_;
   static std::map<int, std::string> syscallNamesMap_;
   #endif