asuswrt-merlin.ng/release/src-rt-5.02axhnd.675x/router-sysdep.rt-ax82u/bcm_util/bcm_ulog.c

/***********************************************************************
 *
 *  Copyright (c) 2018  Broadcom Ltd
 *  All Rights Reserved
 *
<:label-BRCM:2018:DUAL/GPL:standard

Unless you and Broadcom execute a separate written software license
agreement governing use of this software, this software is licensed
to you under the terms of the GNU General Public License version 2
(the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php,
with the following added to such license:

   As a special exception, the copyright holders of this software give
   you permission to link this software with independent modules, and
   to copy and distribute the resulting executable under terms of your
   choice, provided that you also meet, for each linked independent
   module, the terms and conditions of the license of that module.
   An independent module is a module which is not derived from this
   software.  The special exception does not apply to any modifications
   of the software.

Not withstanding the above, under no circumstances may you combine
this software in any way with any other Broadcom software provided
under a license other than the GPL, without Broadcom's express prior
written consent.

:>
 *
 ************************************************************************/

#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <syslog.h>

#include "sysutil.h"
#include "sysutil_proc.h"
#include "bcm_ulog.h"


static BcmuLogLevel ulogLevel = BCMULOG_DEFAULT_LEVEL;
static UINT32 ulogDestMask = BCMULOG_DEFAULT_DESTMASK;
static UINT32 ulogHdrMask = BCMULOG_DEFAULT_HDRMASK;
static char appName[BCMULOG_MAX_APP_NAME_LEN] = {0};


void bcmuLog_formatLine(BcmuLogFormatInfo *info, const char *pFmt, va_list ap)
{
   UINT32 len=0;
   UINT32 maxLen;

   /* start with empty buf and reserve 1 byte at end for termination. */
   memset(info->buf, 0, info->bufLen);
   maxLen = info->bufLen - 1;

   if ((info->logHeaderMask & BCMULOG_HDRMASK_APPNAME) && (len < maxLen))
   {
      if (info->appName[0] != '\0')
      {
         len += snprintf(&(info->buf[len]), maxLen - len, "%s:", info->appName);
      }
   }

   if ((info->logHeaderMask & BCMULOG_HDRMASK_THREAD_ID) && (len < maxLen))
   {
      int tid = sysUtl_gettid();
      len += snprintf(&(info->buf[len]), maxLen - len, "%d:", tid);
   }

   /*
    * Eventhough syslog will also log the time, this timestamp is more accurate.
    * But caller can always turn it off.
    */
   if ((info->logHeaderMask & BCMULOG_HDRMASK_TIMESTAMP) && (len < maxLen))
   {
      struct timespec ts = {0, 0};
      clock_gettime(CLOCK_MONOTONIC, &ts);
      len += snprintf(&(info->buf[len]), maxLen - len, "%lu.%03lu:",
                      ts.tv_sec%1000, ts.tv_nsec/1000000);
   }

   if ((info->logHeaderMask & BCMULOG_HDRMASK_LEVEL) && (len < maxLen))
   {
      /*
       * Don't include severity when going to syslog because syslog puts
       * that in for us.
       */
      if (!(info->logDestMask & BCMULOG_DESTMASK_SYSLOG))
      {
         char *logLevelStr;
         switch(info->logLevel)
         {
         case BCMULOG_LEVEL_ERR:
            logLevelStr = "error";
            break;
         case BCMULOG_LEVEL_NOTICE:
            logLevelStr = "notice";
            break;
         case BCMULOG_LEVEL_DEBUG:
            logLevelStr = "debug";
            break;
         default:
            logLevelStr = "invalid-log-level";
            break;
         }
         len += snprintf(&(info->buf[len]), maxLen - len, "%s:", logLevelStr);
      }
   }

   if ((info->logHeaderMask & BCMULOG_HDRMASK_LOCATION) && (len < maxLen))
   {
      len += snprintf(&(info->buf[len]), maxLen - len, "%s:%u:",
                      info->funcName, info->lineNum);
   }

   if (len < maxLen)
   {
      vsnprintf(&(info->buf[len]), maxLen - len, pFmt, ap);
   }
}

void bcmuLog_setName(const char *name)
{
   if (name != NULL)
   {
      strncpy(appName, name, sizeof(appName)-1);
   }
}

void bcmuLog_setLevel(UINT32 level)
{
   ulogLevel = level;
}

UINT32 bcmuLog_getLevel(void)
{
   return ulogLevel;
}

void bcmuLog_setHdrMask(UINT32 mask)
{
   ulogHdrMask = mask;
}

UINT32 bcmuLog_getHdrMask(void)
{
   return ulogHdrMask;
}

void bcmuLog_setDestMask(UINT32 mask)
{
   ulogDestMask = mask;
}

static void setNameFromProc()
{
   ProcThreadInfo tInfo;
   int tid;

   tid = sysUtl_gettid();
   sysUtl_getThreadInfoFromProc(tid, &tInfo);
   strncpy(appName, tInfo.name, sizeof(appName)-1);
   return;
}

static void fillFormatInfo(char *buf,
                           UINT32 bufLen,
                           BcmuLogLevel level,
                           const char *funcName,
                           UINT32 lineNum,
                           BcmuLogFormatInfo *info)
{
   memset(info, 0, sizeof(BcmuLogFormatInfo));
   info->buf = buf;
   info->bufLen = bufLen;
   info->logLevel = level;
   info->logDestMask = ulogDestMask;
   info->logHeaderMask = ulogHdrMask;
   info->lineNum = lineNum;
   strncpy(info->funcName, funcName, sizeof(info->funcName)-1);
   if (appName[0] == '\0')
   {
      setNameFromProc();
   }
   strncpy(info->appName, appName, sizeof(info->appName)-1);
}

static void outputLogBuf(int level, const char *buf)
{
   if (ulogDestMask & BCMULOG_DESTMASK_STDERR)
   {
      fprintf(stderr, "%s\n", buf);
      fflush(stderr);
   }

   if (ulogDestMask & BCMULOG_DESTMASK_SYSLOG)
   {
      /* use of openlog is optional, so just call syslog */
      syslog(level, "%s", buf);
   }
}

void ulog_log(BcmuLogLevel level, const char *funcName, UINT32 lineNum, const char *pFmt, ... )
{
   char logBuf[BCMULOG_MAX_LINE_LEN];
   BcmuLogFormatInfo info;
   va_list ap;

   if (level > ulogLevel)
   {
      return;
   }

   fillFormatInfo(logBuf, sizeof(logBuf), level, funcName, lineNum, &info);
   va_start(ap, pFmt);
   bcmuLog_formatLine(&info, pFmt, ap);
   va_end(ap);

   outputLogBuf(level, logBuf);
}