Function cbm_spawn_backoff

src/foundation/subprocess.c:969–974

enum { CBM_SPAWN_BACKOFF_BASE_MS = 10, CBM_SPAWN_BACKOFF_MAX_SHIFT = 8 };

static void cbm_spawn_backoff(int attempt) {
    int shift = attempt < CBM_SPAWN_BACKOFF_MAX_SHIFT ? attempt : CBM_SPAWN_BACKOFF_MAX_SHIFT;
    long ms = (long)CBM_SPAWN_BACKOFF_BASE_MS << shift;
    struct timespec delay = {ms / 1000L, (ms % 1000L) * 1000L * 1000L};
    (void)cbm_nanosleep(&delay, NULL);
}

/* fork() fails with EAGAIN under the same pressure posix_spawn does, and the
 * fallback path must not be less robust than the primary one. */