DEBUG_LEVEL
if (level & DEBUG_LEVEL) \
if (level & DEBUG_LEVEL) \
if (level & DEBUG_LEVEL) \
if ((level) & DEBUG_LEVEL) \
#ifndef DEBUG_LEVEL
if (level <= DEBUG_LEVEL) \
if (DEBUG_LEVEL >= 2)
if (ret < 0 && (DEBUG_LEVEL > 0))
if (DEBUG_LEVEL > 0)
if (DEBUG_LEVEL > 4)