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Intel Open Source License 

Copyright (c) 2002-2018 Intel Corporation. All rights reserved.
 
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modification, are permitted provided that the following conditions are
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Redistributions of source code must retain the above copyright notice,
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END_LEGAL */
#include <assert.h>
#include <stdio.h>
#include <dlfcn.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <string>
#include <list>
#include <sys/syscall.h>
#include <sched.h>


using namespace std;

bool allThreadsCanceled = false;
void CancelAllThreads();
void BlockSignal(int sigNo);
void UnblockSignal(int sigNo);

/* 
 * The total number of threads that should run in this process
 * The number may be changed in command line with -th_num
 */
unsigned int numOfSecondaryThreads = 4;


/*
 * Get thread Id
 */
pid_t GetTid()
{
     return syscall(__NR_gettid);
}

void UnblockAllSignals()
{
     sigset_t mask;
     sigemptyset(&mask);
     sigprocmask(SIG_SETMASK, &mask, 0);
}

/*
 * A signal handler for canceling all threads
 */
void SigUsr1Handler(int sig)
{
    if (!allThreadsCanceled)
    {
        fprintf(stderr, "Cancel all threads\n");
        CancelAllThreads();
        allThreadsCanceled = true;
    }
}

extern "C" void foo()
{
    throw (0);
}
/*
 * An endless-loop function for secondary threads
 */

void * ThreadEndlessLoopFunc(void * arg)
{
    int x = 0;
    while (1) 
    {
        x++;
        if (x > 10) 
        {
            x = 0;
        }
    }

    return 0;
}


void * ThreadExitFunc(void * arg)
{
    int p;
    pthread_exit(&p);
    return 0;
}


#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
 */
pid_t AttachAndInstrument(list <string > * pinArgs)
{
    list <string >::iterator pinArgIt = pinArgs->begin();

    string pinBinary = *pinArgIt;
    pinArgIt++;

    pid_t parent_pid = getpid();
    
    pid_t child = fork();

    if (child) 
    {
        fprintf(stderr, "Pin injector pid %d\n", child);
        // inside parent
        return child;  
    }
    else
    {
        // inside child

        UnblockAllSignals();
        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);

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


/*
 * 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 == "-th_num")
        {
            numOfSecondaryThreads = atoi(argv[++i]) - 1;
        }
        else 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);
}

pthread_t *thHandle;

extern "C" int ThreadsReady(unsigned int numOfThreads)
{
    assert(numOfThreads == numOfSecondaryThreads+1);
    return 0;
}
    
int main(int argc, char *argv[])
{
   list <string> pinArgs;
   ParseCommandLine(argc, argv, &pinArgs);
    
    signal(SIGUSR1, SigUsr1Handler);
    
    thHandle = new pthread_t[numOfSecondaryThreads];

    // start all secondary threads
    // in the secondary threads SIGUSR1 should be blocked
    BlockSignal(SIGUSR1);
    for (unsigned int i = 0; i < numOfSecondaryThreads; i++)
    {
        pthread_create(&thHandle[i], 0, ThreadEndlessLoopFunc, (void *)i);
    }
    UnblockSignal(SIGUSR1);

    AttachAndInstrument(&pinArgs);
    
    // Give enough time for all threads to get started 
    while (!ThreadsReady(numOfSecondaryThreads+1))
    {
        sched_yield();
    }        
        
    try {
        foo();
    }
    catch(...)
    {
        printf("Exception caught successfully\n");
    }
    
    for (unsigned int i = 0; i < numOfSecondaryThreads; i++)
    {
        pthread_t th;
        pthread_create(&th, 0, ThreadExitFunc, (void *)i);
    }
        
    fprintf(stderr, "Sending SIGUSR1\n");
    kill(getpid(), SIGUSR1);
    
    while(!allThreadsCanceled)
    {
        sched_yield();
    }
    fprintf(stderr, "All threads are canceled after SIGUSR1\n");

    return 0;
}

void CancelAllThreads()
{
    for (unsigned int i = 0; i < numOfSecondaryThreads; i++)
    {
        pthread_cancel(thHandle[i]);
    }
}

void BlockSignal(int sigNo)
{
    sigset_t mask;
    sigemptyset(&mask);
    sigaddset(&mask, sigNo);   
    sigprocmask(SIG_BLOCK, &mask, 0);
}
void UnblockSignal(int sigNo)
{
    sigset_t mask;
    sigemptyset(&mask);
    sigaddset(&mask, sigNo);
    sigprocmask(SIG_UNBLOCK, &mask, 0);
}
