#define die(...) {fprintf(stderr,"file %s,line %d\n",__FILE__,__LINE__);die_func(__VA_ARGS__);}
void remove_cgroup();

static void die_func(const char *fmt, ...)
{
    va_list params;
    va_start(params, fmt);
    vfprintf(stderr, fmt, params);
    puts("\n");
    va_end(params);
    remove_cgroup();
    exit(1);
}

static void write_file(char* path, char* line)
{
    FILE *f = fopen(path, "w");
    if (f == NULL) {die("Failed to open file %s: %m\n", path);}
    if (fwrite(line, 1, strlen(line), f) < 0) {die("Failed to write to file %s:\n", path);}
    if (fclose(f) != 0) {die("Failed to close file %s: %m\n", path);}
}