#ifndef _POPEN2
#define _POPEN2

#include <popen2.hpp> 

#include <unistd.h>

#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <utility>


// Like popen(), but returns two FILE*: child's stdin and stdout, respectively.
std::pair<FILE *, FILE *> popen2(const char *command) {
    // pipes[0]: parent writes, child reads (child's stdin)
    // pipes[1]: child writes, parent reads (child's stdout)
    int pipes[2][2];

    pipe(pipes[0]);
    pipe(pipes[1]);

    if (fork() > 0) {
        // parent
        close(pipes[0][0]);
        close(pipes[1][1]);

        return {fdopen(pipes[0][1], "w"), fdopen(pipes[1][0], "r")};
    } else {
        // child
        close(pipes[0][1]);
        close(pipes[1][0]);

        dup2(pipes[0][0], STDIN_FILENO);
        dup2(pipes[1][1], STDOUT_FILENO);

        execl("/bin/sh", "/bin/sh", "-c", command, NULL);

        exit(1);
    }
}

#endif