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/*
   Test the scenario where Pin attaches to an application, using the command line,
   which one of its secondary thread is a zombie thread
   Pin wouldn't attach the zombie thread and wouldn't give a thread detach callbacks
   on detach to the zombie thread.
*/

#include <stdio.h>
#include <pthread.h>
#include <sys/types.h>
#include <unistd.h>
#include <assert.h>
#include <stdlib.h>
#include <sched.h>
#include <string.h>
#include <iostream>
#include "zombie_utils.h"

static int pipefd[2];

void* SecondaryThreadMain(void* v)
{
    close(pipefd[0]); // Close child's read end
    write(pipefd[1], const_cast<char *>("NotifyParent"), strlen(const_cast<char *>("NotifyParent")));
    close(pipefd[1]);// Close parent's write end
    pthread_exit(0);
}


// Expected argv arguments:
// [1] pin executable
// [2] -slow_assert
// [3] tool
// [4] output file	
int main(int argc, char *argv[])
{    
    if(argc!=5)
    {
       fprintf(stderr, "Not enough arguments\n" );
       fflush(stderr);
       exit(RES_INVALID_ARGS);
    }
    
    if( pipe(pipefd)== -1)         
    {         
        fprintf(stderr, "Pipe Failed.\n");  
        return RES_PIPE_CREATION_ERROR;
    } 

    // The pipe is used to transfer information from the
    // child process to the secondary thread.
    pid_t child_pid;
    pid_t parentPid = getpid();

    child_pid = fork ();
    
    if (child_pid > 0) 
    {  
        pthread_t tid; 
        pthread_create(&tid, NULL, SecondaryThreadMain, NULL);       
        while(1) sleep(1);
    }
    else 
    {  
        // In child
        char attachPid[MAX_SIZE];
        snprintf(attachPid ,MAX_SIZE , "%d", parentPid);
        
        close(pipefd[1]);// Close parent's write end
        int buf[2];
        if (read(pipefd[0], buf, 1) < 0)
        {
            exit(RES_PIPE_ERROR);
        }

        close(pipefd[0]);// Close parent's write end.

        // Pin attaches to the application.
        execl(argv[1], argv[1], argv[2], "-probe","-pid", attachPid,  "-t",  argv[3], "-o", argv[4], NULL); // never return
        
        exit(RES_EXEC_FAILED);
       
    }

    return RES_SUCCESS;
}
