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libwebsockets日志系统也是分等级的，如下:

 #define LLL_ERR     (1 << 0)#define LLL_WARN    (1 << 1)#define LLL_NOTICE  (1 << 2)#define LLL_INFO    (1 << 3)#define LLL_DEBUG   (1 << 4)#define LLL_PARSER  (1 << 5)#define LLL_HEADER  (1 << 6)#define LLL_EXT     (1 << 7)#define LLL_CLIENT  (1 << 8)#define LLL_LATENCY (1 << 9)#define LLL_USER    (1 << 10)#define LLL_THREAD  (1 << 11)#define LLL_COUNT   (12) /* set to count of valid flags */NORMAL   masterɆ  include/libwebsockets/lws-logs.h   

要想打印日志，除了设置对应的等级外还需:

• 关闭宏定义LWS_WITH_NO_LOGS
• lws_set_log_level((1<<LLL_COUNT)-1, NULL)设置动态日志等级

/** Figure out which logs to build in or not*/#if defined(_DEBUG)/** In DEBUG build, select all logs unless NO_LOGS*/#if defined(LWS_WITH_NO_LOGS)#define _LWS_LINIT (LLL_ERR | LLL_USER)#else#define _LWS_LINIT ((1 << LLL_COUNT) - 1)#endif
#else /* not _DEBUG */
#if defined(LWS_WITH_NO_LOGS)
#define _LWS_LINIT (LLL_ERR | LLL_USER)
#else#define _LWS_LINIT (LLL_ERR | LLL_USER | LLL_WARN | LLL_NOTICE)
#endif
#endif /* _DEBUG */

lws_set_log_level((1<<LLL_COUNT)-1, NULL);