#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>

void checker(bool stmt, const char *usrmsg, const char *file, const char *func, const int line){
    if(!stmt){
        perror(usrmsg);
        fprintf(stderr, "%s %s %d\n", file, func, line);
        exit(EXIT_FAILURE);
    }
}

#define osAssert(stmt, usrmsg) checker(stmt,usrmsg,__FILE__, __func__, __LINE__);

#define PIPE_RD (0)
#define PIPE_WR (1)
#define MAX_LINE (128)

int main(){
    int pipeFD[2];
    osAssert(-1 != pipe(pipeFD), "pipe creation failed");

    pid_t child = fork();
    osAssert(-1 != child, "fork failed");

    if(child>0){
        //parrent
        close(pipeFD[PIPE_RD]);
        printf("Parrent: ");

        char *lineRead = NULL;
        size_t lineReadLen = 0;
        osAssert(-1 != getline(&lineRead, &lineReadLen, stdin), "user read failed");

        osAssert(-1 != write(pipeFD[PIPE_WR], lineRead, lineReadLen), "write failed");
        osAssert(-1 != wait(NULL), "wait failed");
        close(pipeFD[PIPE_WR]);


    } else {
        //kid
        close(pipeFD[PIPE_WR]);

        char buf[MAX_LINE];
        osAssert(-1 != read(pipeFD[PIPE_RD], buf, sizeof buf), "read failed");
        close(pipeFD[PIPE_RD]);
        printf("Child: %s\n", buf);
        exit(0);
    }
    return 0;
}