//---------------------------------------------------------
// com.pipe.cc
//---------------------------------------------------------

#include "check.h" // check

#include <iostream>   // cout
#include <sys/wait.h> // wait
#include <unistd.h>   // fork pipe

int main()
{
    const char EOS = '\0';
    const int RD = 0, WR = 1;

    int c2p[2]; // child to parent pipe

    check(pipe(c2p)); // create pipe

    if (check(fork())) // parent/reader
    {
        char c = 0;
        std::cout << "parent/reader: ";
        do
        {
            check(read(c2p[RD], &c, 1));
            if (c != '\0')
                std::cout << c;
        } while (c != '\0');
        wait(nullptr);
    }
    else // child/writer
    {
        std::cout << " child/writer: ";
        for (char c = 'a'; c <= 'z'; ++c)
        {
            check(write(c2p[WR], &c, 1));
            std::cout << c;
        }
        check(write(c2p[WR], &EOS, 1));
    }

    std::cout << std::endl;
}