libgchack.c

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>

typedef struct pthread_internal_t
{
    struct pthread_internal_t*  next;
    struct pthread_internal_t** pref;
    pthread_attr_t              attr;
    pid_t                       kernel_id;
    pthread_cond_t              join_cond;
    int                         join_count;
    void*                       return_value;
    int                         intern;
    __pthread_cleanup_t*        cleanup_stack;
    void**                      tls;         /* thread-local storage area */
} pthread_internal_t;

int main(int argc, char** argv) {
	int pid =  fork();
	int self = pthread_self();
	pthread_internal_t* t = (pthread_internal_t*)self;
	printf("%d %d %d\n", pid, t->kernel_id, gettid());
	
	// 7196 7195 7195
	// 0 7195 7196
	
	// Note that the internal kernel ids are the SAME after fork. This is wrong!
	
	return 0;
}