Thread: wait() not working

Hey guys,

I'm trying to start a process which executes the uniq command to every string in a string array. this already works good. But I have to wait for execlp in parent, because the main program exits before uniq command finishes. How can I achieve this?

Code:

static void uniq_process(void) {    pid_t pid;
    int fd[2];


    if (pipe(fd) < 0) {
        bail_out("Error creating pipe");
    }


    pid = fork();


    /* child process */
    if (pid == 0) {
        close(fd[1]);
        close(STDIN_FILENO);
        dup(fd[0]);
        (void) execlp("uniq", "uniq", "-d",  (char*) 0 );


        bail_out("execlp failed");
    }     
    /* parent process */
    else if (pid > 0) {
    
        FILE *file = fdopen(fd[1] , "w");
        close(fd[0]);


        for (int i = 0; i < array_size; i++) {
            (void) fprintf(file, "%s", output_array[i]);
        }
        (void) fclose(file);


    } else  {
        bail_out("Fork error");
    }
}

Thanks for your help and time.