#include "kernel/types.h"
#include "user/user.h"

int main(int argc, char** argv) {
    int p[2]; // hell, read from p[0] and write to p[1] no matter in pa/ch
    if (pipe(p) == -1) exit(1);
    uint8 senddata[] = {0xAC};
    uint8 recvdata[] = {0};
    int pid = fork();
    if (pid == 0) {
        // child
        if (read(p[0], recvdata, 1) != 1) printf("error child read\n");
        close(p[0]);
        printf("%d: received ping\n", getpid());
        if (write(p[1], senddata, 1) != 1) printf("error child write\n");
        close(p[1]);
        exit(0);
    }
    else {
        if (write(p[1], senddata, 1) != 1) printf("error parent write\n");
        close(p[1]);
        if (read(p[0], recvdata, 1) != 1) printf("error parent read\n");
        printf("%d: received pong\n", getpid());
        close(p[0]);
        exit(0);
    }
}