Programming

pid = fork();

errno=0;    
    if(pid == 0) //Target Program-Child Process
     {
            dup2(fd2,STDOUT_FILENO);
            dup2(fd2,STDERR_FILENO);
            close(fd2);close(fd1);

               execl(argv[2],argv[3],argv[4],NULL);
//--------------------------------------------pipe -->return here only in the case of execve failure
        close(mypipe[0]);
        write(mypipe[1],strerror(errno),(strlen(strerror(errno))+1));    
//-------------------------------------------end of pipe-----
          exit(EXIT_FAILURE);

         }

    else if (pid>0)//Fault Injector Process-Parent Process
    {
    sprintf(proc_status,"/proc/%d/status",pid);
    timer(0.100);
    f12=fopen(proc_status,"r");fseek(f12,20,SEEK_SET);str=fgetc(f12);
    if(str!='Z'){shoot++;kill(pid,9);}

    
     waitpid(pid,&status,0);//wait for child to finish or interrupt
....
void timer(float cycle)//timer in microsec precision
{
    float count=0.0;
    int loop=1;
while(loop)
{
    usleep(1000);
    count+=0.001;
    if(count>=cycle)
    {loop=0;}
}
}

 f12=fopen(proc_status,"r");fseek(f12,20,SEEK_SET);str=fgetc(f12);
    if(str!='Z'){shoot++;kill(pid,9);}