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

void python(int input[2], int output[2]) {
        dup2(output[1], STDOUT_FILENO);
        dup2(input[0], STDIN_FILENO);
        close(output[0]);
        close(output[1]);
        close(input[0]);
        close(input[1]);
        char *const args[] = { "/usr/bin/python", NULL };
        execv(args[0], args);
        _exit(EXIT_FAILURE);
}

int main(int argc, char *argv[])
{
    int input[2];
    pipe(input);
    int output[2];
    pipe(output);

    if (fork() == 0) python(input, output);

    FILE *inputf, *outputf;

    close(output[1]);
    close(input[0]);
    outputf = fdopen(output[0], "r");
    inputf = fdopen(input[1], "w");

    fputs("print 123\n", inputf);
    fclose(inputf);

    char tt;
    for (tt=0; tt<40; tt++)
      fputc(tt, inputf);

    int c;
    while ((c = fgetc(outputf)) != EOF)
	  fputc(c, stdout);

    fputc(EOF, inputf);

    wait(NULL);
    return 0;
}