Thread: what is wrong with this simple problem

What is wrong with the following code, there is no result ,just waiting, i do not know why that happens

Code:

int main(void) {
    int pid, mypipe[2];
    if(pipe(mypipe) == -1) {
        perror("pipe");
        exit(1);
    }
    pid = fork();
    if(pid > 0) {
        dup2(mypipe[0],0);
        close(mypipe[0]);
        execlp("wc","wc",NULL);
        perror("exec");
        exit(1);
    }
    if(pid == 0) {
        dup2(mypipe[1],1);
        close(mypipe[1]);
        execlp("ls", "ls", NULL);
        perror("exec");
        exit(1);
    }
    return 0;
}

I think you should write some debug information into a file (or two) so
you can see what is going on. Flush the file after every write.