char env[tracked_fds_count * (10 + 1) * sizeof(char)];
char *x = env;
size_t i;
for (i = 0; i < tracked_fds_count; i++) {
int length = snprintf(x, 10 + 1, "%d", tracked_fds[i]);
char env[tracked_fds_count * (10 + 1) * sizeof(char)];
char *x = env;
size_t i;
for (i = 0; i < tracked_fds_count; i++) {
int length = snprintf(x, 10 + 1, "%d", tracked_fds[i]);