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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* included from libwebsockets.h
*/
/** \defgroup log Logging
*
* ##Logging
*
* Lws provides flexible and filterable logging facilities, which can be
* used inside lws and in user code.
*
* Log categories may be individually filtered bitwise, and directed to built-in
* sinks for syslog-compatible logging, or a user-defined function.
*/
///@{
enum lws_log_levels {
LLL_ERR = 1 << 0,
LLL_WARN = 1 << 1,
LLL_NOTICE = 1 << 2,
LLL_INFO = 1 << 3,
LLL_DEBUG = 1 << 4,
LLL_PARSER = 1 << 5,
LLL_HEADER = 1 << 6,
LLL_EXT = 1 << 7,
LLL_CLIENT = 1 << 8,
LLL_LATENCY = 1 << 9,
LLL_USER = 1 << 10,
LLL_THREAD = 1 << 11,
LLL_COUNT = 12 /* set to count of valid flags */
};
/**
* lwsl_timestamp: generate logging timestamp string
*
* \param level: logging level
* \param p: char * buffer to take timestamp
* \param len: length of p
*
* returns length written in p
*/
LWS_VISIBLE LWS_EXTERN int
lwsl_timestamp(int level, char *p, int len);
#if defined(LWS_PLAT_OPTEE) && !defined(LWS_WITH_NETWORK)
#define _lws_log(aaa, ...) SMSG(__VA_ARGS__)
#else
LWS_VISIBLE LWS_EXTERN void _lws_log(int filter, const char *format, ...) LWS_FORMAT(2);
LWS_VISIBLE LWS_EXTERN void _lws_logv(int filter, const char *format, va_list vl);
#endif
/* these guys are unconditionally included */
#define lwsl_err(...) _lws_log(LLL_ERR, __VA_ARGS__)
#define lwsl_user(...) _lws_log(LLL_USER, __VA_ARGS__)
#if !defined(LWS_WITH_NO_LOGS)
/* notice and warn are usually included by being compiled in */
#define lwsl_warn(...) _lws_log(LLL_WARN, __VA_ARGS__)
#define lwsl_notice(...) _lws_log(LLL_NOTICE, __VA_ARGS__)
#endif
/*
* weaker logging can be deselected by telling CMake to build in RELEASE mode
* that gets rid of the overhead of checking while keeping _warn and _err
* active
*/
#if defined(_DEBUG)
#if defined(LWS_WITH_NO_LOGS)
/* notice, warn and log are always compiled in */
#define lwsl_warn(...) _lws_log(LLL_WARN, __VA_ARGS__)
#define lwsl_notice(...) _lws_log(LLL_NOTICE, __VA_ARGS__)
#endif
#define lwsl_info(...) _lws_log(LLL_INFO, __VA_ARGS__)
#define lwsl_debug(...) _lws_log(LLL_DEBUG, __VA_ARGS__)
#define lwsl_parser(...) _lws_log(LLL_PARSER, __VA_ARGS__)
#define lwsl_header(...) _lws_log(LLL_HEADER, __VA_ARGS__)
#define lwsl_ext(...) _lws_log(LLL_EXT, __VA_ARGS__)
#define lwsl_client(...) _lws_log(LLL_CLIENT, __VA_ARGS__)
#define lwsl_latency(...) _lws_log(LLL_LATENCY, __VA_ARGS__)
#define lwsl_thread(...) _lws_log(LLL_THREAD, __VA_ARGS__)
#else /* no debug */
#if defined(LWS_WITH_NO_LOGS)
#define lwsl_warn(...) do {} while(0)
#define lwsl_notice(...) do {} while(0)
#endif
#define lwsl_info(...) do {} while(0)
#define lwsl_debug(...) do {} while(0)
#define lwsl_parser(...) do {} while(0)
#define lwsl_header(...) do {} while(0)
#define lwsl_ext(...) do {} while(0)
#define lwsl_client(...) do {} while(0)
#define lwsl_latency(...) do {} while(0)
#define lwsl_thread(...) do {} while(0)
#endif
#define lwsl_hexdump_err(...) lwsl_hexdump_level(LLL_ERR, __VA_ARGS__)
#define lwsl_hexdump_warn(...) lwsl_hexdump_level(LLL_WARN, __VA_ARGS__)
#define lwsl_hexdump_notice(...) lwsl_hexdump_level(LLL_NOTICE, __VA_ARGS__)
#define lwsl_hexdump_info(...) lwsl_hexdump_level(LLL_INFO, __VA_ARGS__)
#define lwsl_hexdump_debug(...) lwsl_hexdump_level(LLL_DEBUG, __VA_ARGS__)
/**
* lwsl_hexdump_level() - helper to hexdump a buffer at a selected debug level
*
* \param level: one of LLL_ constants
* \param vbuf: buffer start to dump
* \param len: length of buffer to dump
*
* If \p level is visible, does a nice hexdump -C style dump of \p vbuf for
* \p len bytes. This can be extremely convenient while debugging.
*/
LWS_VISIBLE LWS_EXTERN void
lwsl_hexdump_level(int level, const void *vbuf, size_t len);
/**
* lwsl_hexdump() - helper to hexdump a buffer (DEBUG builds only)
*
* \param buf: buffer start to dump
* \param len: length of buffer to dump
*
* Calls through to lwsl_hexdump_level(LLL_DEBUG, ... for compatability.
* It's better to use lwsl_hexdump_level(level, ... directly so you can control
* the visibility.
*/
LWS_VISIBLE LWS_EXTERN void
lwsl_hexdump(const void *buf, size_t len);
/**
* lws_is_be() - returns nonzero if the platform is Big Endian
*/
static LWS_INLINE int lws_is_be(void) {
const int probe = ~0xff;
return *(const char *)&probe;
}
/**
* lws_set_log_level() - Set the logging bitfield
* \param level: OR together the LLL_ debug contexts you want output from
* \param log_emit_function: NULL to leave it as it is, or a user-supplied
* function to perform log string emission instead of
* the default stderr one.
*
* log level defaults to "err", "warn" and "notice" contexts enabled and
* emission on stderr. If stderr is a tty (according to isatty()) then
* the output is coloured according to the log level using ANSI escapes.
*/
LWS_VISIBLE LWS_EXTERN void
lws_set_log_level(int level,
void (*log_emit_function)(int level, const char *line));
/**
* lwsl_emit_syslog() - helper log emit function writes to system log
*
* \param level: one of LLL_ log level indexes
* \param line: log string
*
* You use this by passing the function pointer to lws_set_log_level(), to set
* it as the log emit function, it is not called directly.
*/
LWS_VISIBLE LWS_EXTERN void
lwsl_emit_syslog(int level, const char *line);
/**
* lwsl_emit_stderr() - helper log emit function writes to stderr
*
* \param level: one of LLL_ log level indexes
* \param line: log string
*
* You use this by passing the function pointer to lws_set_log_level(), to set
* it as the log emit function, it is not called directly.
*
* It prepends a system timestamp like [2018/11/13 07:41:57:3989]
*
* If stderr is a tty, then ansi colour codes are added.
*/
LWS_VISIBLE LWS_EXTERN void
lwsl_emit_stderr(int level, const char *line);
/**
* lwsl_emit_stderr_notimestamp() - helper log emit function writes to stderr
*
* \param level: one of LLL_ log level indexes
* \param line: log string
*
* You use this by passing the function pointer to lws_set_log_level(), to set
* it as the log emit function, it is not called directly.
*
* If stderr is a tty, then ansi colour codes are added.
*/
LWS_VISIBLE LWS_EXTERN void
lwsl_emit_stderr_notimestamp(int level, const char *line);
/**
* lwsl_visible() - returns true if the log level should be printed
*
* \param level: one of LLL_ log level indexes
*
* This is useful if you have to do work to generate the log content, you
* can skip the work if the log level used to print it is not actually
* enabled at runtime.
*/
LWS_VISIBLE LWS_EXTERN int
lwsl_visible(int level);
///@}
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