net snmp

 /etc/snmp/snmpd.conf

rocommunity public

agentAddress udp:161

pass .1.3.6.1.4.1.55554 /bin/bash /snmp.sh

 /snmp.sh

#!/bin/bash

opt=$1

oid=$2

echo "$(date) - called with opt=$opt oid=$oid" >> /tmp/snmp_script.log

if [ "$opt" = "-g" ]; then

  case "$oid" in

    ".1.3.6.1.4.1.55554.1.1.0")

      echo "$oid"

      echo "INTEGER"

      echo "1"

      ;;

    ".1.3.6.1.4.1.55554.1.2.0")

      echo "$oid"

      echo "STRING"

      echo "IPCamModelX"

      ;;

    *)

      exit 1

      ;;

  esac

elif [ "$opt" = "-n" ]; then

  # 簡單示範，回傳下一個 OID

  if [ "$oid" = ".1.3.6.1.4.1.55554.1.1.0" ]; then

    echo ".1.3.6.1.4.1.55554.1.2.0"

    echo "STRING"

    echo "IPCamModelX"

  else

    exit 1

  fi

elif [ "$opt" = "-s" ]; then

  # 如果要支援 set，這邊寫set邏輯

  exit 1

else

  exit 1

fi

Agent

 /usr/sbin/snmpd -V -f -Lo -C -c /etc/snmp/snmpd.conf -Dpass,persist,mib_modules

Client

snmpwalk -v2c -c public localhost .1.3.6.1.4.1.55554.1.1.0

Output

iso.3.6.1.4.1.55554.1.1.0 = INTEGER: 1

Pure RTSP over Websocket Player build in browser

 https://anzal.hashnode.dev/a-beginners-guide-to-rtsp-streaming-with-websockets-using-nodejs-and-ffmpeg

A Beginner’s Guide to RTSP Streaming with WebSockets Using Node.js and FFmpeg.

内存泄漏定位工具之 valgrind

 https://blog.csdn.net/weixin_45631738/article/details/129541098?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-1-129541098-blog-124682490.235^v43^pc_blog_bottom_relevance_base8&spm=1001.2101.3001.4242.2&utm_relevant_index=4

Free scrum board

1. Redmine
1.  Redmine Plugins & Themes 介紹：那些我成功安裝的外掛
2. Plugins Directory » Redmine Dashboard
3. 如何用 Redmine 做專案管理＆體驗心得
4. 
   
   
   
2. OpenProject
1. 
   
   
   
3. Asana
1. 
   
   
   
2. 2G only
4. Gitlab
1. 
   
   
   
5. JIRA
1. 10G only

libevent timer

https://www.cnblogs.com/osbreak/p/17823102.html

 #include <iostream>

#include <event2/event.h> #include <signal.h> using namespace std; void timer(int sockfd, short what, void* arg) { cout << "[timer2]" << endl; } int main(int argc, char* argv[]) { event_base* base = event_base_new(); // 持久事件 event *ev = event_new(base,-1,EV_PERSIST,timer,0); //超时优化性能优化，默认event 用二叉堆存储（完全二叉树） 插入删除O（logn） //优化到双向队列 插入删除O（1） static timeval tv_in = {3,0}; const timeval *t; t = event_base_init_common_timeout(base,&tv_in); event_add(ev3,t3); // 性能优化：插入性能 O(1) // 进入事件主循环 event_base_dispatch(base); event_base_free(base); return 0; }

valgrind compilation

 https://blog.csdn.net/HZHejo/article/details/124682490

Check libraries dependence

 

Ref: https://albert-oma.blogspot.com/

check libraries dependence:

$ arm-linux-gnueabihf-readelf -d ./gst-launch-1.0

Virtual memory related

 Linux内存管理之vmap与vmalloc 圖文並茂 , 針對vmap_area

mmap system call 後, 進kernel 的流程 gitmind 自畫

https://elixir.free-electrons.com/linux/v5.10.230/source/mm/util.c 方便追code, 含各版本

AArch64 Linux memory layout

用 LD_PRELOAD 替換動態連結的函式庫

用 LD_PRELOAD 替換動態連結的函式庫

https://jasonblog.github.io/note/fcamel/04.html

TFAT

Power Fail Safe FAT File System

https://elinux.org/images/5/54/Elc2011_munegowda.pdf 

TI-LFAT and TI-LExFAT :

https://www.researchgate.net/publication/271722839_Design_and_Implementation_of_Log_Structured_FAT_and_ExFAT_File_Systems

KFAT:

https://www.researchgate.net/publication/344581895_KFAT_LOG-BASED_TRANSACTIONAL_FAT_FILESYSTEM_FOR_EMBEDDED_MOBILE_SYSTEMS

TFS4:

1. https://elinux.org/images/5/54/Elc2011_munegowda.pdf
2. https://bitsavers.computerhistory.org/components/samsung/flash/TFS4_v1.5.0_Porting_Guide_20060502.pdf
3. 
   
   
   

ExFAT

1. https://events.static.linuxfound.org/images/stories/pdf/lceu11_munegowda_s.pdf

Renesas:. (not Transaction)

TFAT V.4.02 (FatFs R0.13c) for RX family allows to the format feature for SD memory card and USB memory in addition to eMMC and Serial Flash memory.

1.  https://www.renesas.com/en/document/apn/rx-family-open-source-fat-file-system-m3s-tfat-tiny-module-using-firmware-integration-technology?language=en&srsltid=AfmBOootRvzRHDCmHPSjqznUcYY8yXmaEfAfhSOP7xiem1jOCZ-Jukhm
2. https://www.renesas.com/en/software-tool/fat-file-system-m3s-tfat-tiny-rx-family#overview