#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>

enum
{
    NAME_SIZE = 24,
    INTEGER_BASE = 10
};

int
main(int argc, char *argv[])
{
    int fd_r = open("/dev/urandom", O_RDONLY);
    unsigned long long num_r;
    read(fd_r, &num_r, sizeof(num_r));
    close(fd_r);

    char filename[NAME_SIZE];
    snprintf(filename, NAME_SIZE, "%llu%s", num_r, ".py");

    char fullpath[PATH_MAX];
    char *env = getenv("XDG_RUNTIME_DIR");
    if (env != NULL) {
        snprintf(fullpath, PATH_MAX, "%s/%s", env, filename);
    } else if ((env = getenv("TMPDIR")) != NULL) {
        snprintf(fullpath, PATH_MAX, "%s/%s", env, filename);
    } else {
        env = "/tmp";
        snprintf(fullpath, PATH_MAX, "%s/%s", env, filename);
    }
    int fd = open(fullpath, O_CREAT | O_WRONLY | O_CLOEXEC, 0755);

    char string_beg[] = "#! /usr/bin/python3 \nimport os, math\nl = [";
    dprintf(fd, "%s", string_beg);

    for (int i = 1; i < argc; ++i) {
        dprintf(fd, "%s,", argv[i]);
    }

    char string_end[] = "]\nprint(math.prod(l)) \nos.remove(__file__)\n";
    dprintf(fd, "%s", string_end);
    close(fd);
    execlp(fullpath, filename, NULL);
}