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// @ORIGINAL_AUTHOR: Moshe Lazer

/*! @file
 *  Test pause_tool messages when attaching to Linux process  
 *  The application tests that pause_tool messages appears on INJECTOR stdout  
 */

#include <assert.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string>
#include <list>
#include <sys/types.h>
#include <unistd.h>

using namespace std;


#define DECSTR(buf, num) { buf = (char *)malloc(10); sprintf(buf, "%d", num); }

inline void PrintArguments(char **inArgv)
{
    fprintf(stderr, "Going to run: ");
    for(unsigned int i=0; inArgv[i] != 0; ++i)
    {
        fprintf(stderr, "%s ", inArgv[i]);
    }
    fprintf(stderr, "\n");
}


/* AttachAndInstrument()
 * a special routine that runs $PIN
 */
void AttachAndInstrument(list <string > * pinArgs)
{
    list <string >::iterator pinArgIt = pinArgs->begin();

    string pinBinary = *pinArgIt;
    pinArgIt++;

    pid_t parent_pid = getpid();
    
    int stdoutDupFd = dup(STDOUT_FILENO); // duplicating stdout to new file descriptor
    close(STDOUT_FILENO); // closing stdout 

    pid_t child = fork();
    if (child) 
    {
        // INJECTEE is running with its stdout closed
        return;  
    }
    else
    {
        // inside child

        // open stdout using the application original output
        dup2(stdoutDupFd, STDOUT_FILENO); 

        // INJECTOR is running with the original stdout

        char **inArgv = new char*[pinArgs->size()+10];

        unsigned int idx = 0;
        inArgv[idx++] = (char *)pinBinary.c_str(); 
        inArgv[idx++] = (char*)"-pid"; 
        inArgv[idx] = (char *)malloc(10);
        sprintf(inArgv[idx++], "%d", parent_pid);

        for (; pinArgIt != pinArgs->end(); pinArgIt++)
        {
            inArgv[idx++]= (char *)pinArgIt->c_str();
        }
        inArgv[idx] = 0;
        
        PrintArguments(inArgv);

        // Activate pin INJECTOR
        execvp(inArgv[0], inArgv);
        fprintf(stderr, "ERROR: execv %s failed\n", inArgv[0]);
        kill(parent_pid, 9);
        return; 
    }
}


/*
 * Expected command line: <this exe> [-th_num NUM] -pin $PIN -pinarg <pin args > -t tool <tool args>
 */

void ParseCommandLine(int argc, char *argv[], list < string>* pinArgs)
{
    string pinBinary;
    for (int i=1; i<argc; i++)
    {
        string arg = string(argv[i]);
        if (arg == "-pin")
        {
            pinBinary = argv[++i];
        }
        else if (arg == "-pinarg")
        {
            for (int parg = ++i; parg < argc; parg++)
            {
                pinArgs->push_back(string(argv[parg]));
                ++i;
            }
        }
    }
    assert(!pinBinary.empty());
    pinArgs->push_front(pinBinary);
}



extern "C" int MainThreadReady(void)
{
    return 0;
}
    
int main(int argc, char *argv[])
{
   list <string> pinArgs;
   ParseCommandLine(argc, argv, &pinArgs);

   AttachAndInstrument(&pinArgs);

   // Wait for pin to attach
   while (!MainThreadReady())
   {
       sched_yield();
   }        

   return 0;
}

