caixhc-CSDN博客

原创 IOT协议

IOT协议概览

2022-05-06 17:00:59 748

原创 ipv6 socket bind 失败 - accept_dad

file: /proc/sys/net/ipv6/conf/interface/accept_dadvariable: net.ipv6.conf.interface.accept_dadOfficial referenceWhether to accept DAD (Duplicate Address Detection). 0: Disable DAD 1: Enable DAD (default) 2: Enable DAD, and disable IPv6 operation if MA

2020-11-05 10:29:50 1316

转载【转】虚拟网卡 TUN/TAP 驱动程序设计原理

转载：https://www.ibm.com/developerworks/cn/linux/l-tuntap/

2020-10-22 13:33:41 202

转载 ebtables/iptables interaction on a Linux-based bridge

ebtables/iptables interaction on a Linux-based bridgeTable of ContentsIntroduction How frames traverse theebtableschains A machine used as a bridge and a router (not a brouter) DNAT'ing bridged packets Chain traversal for bridged IP packets ...

2020-10-22 13:32:59 386

原创 GDB 调试coredump

举例：NTP coredump1. ps查看ntp的进程号1842 admin 1560 S /usr/sbin/ntpd -n -p cn.ntp.org.cn -p edu.ntp.org.cn2. 先gdb attach到ntp进程，然后手动生成一个coredump文件./gdb attach 1842dlopen failed on 'libthread_db.so.1' - File not foundGDB will not be able to debu...

2020-09-09 09:23:48 1285

原创 glib库宏G_DISABLE_CHECKS

#ifdef G_DISABLE_CHECKS/*** g_return_if_fail:* @expr: the expression to check** Verifies that the expression @expr, usually representing a precondition,* evaluates to %TRUE. If the function returns a value, use* g_return_val_if_fail() instead...

2020-05-15 17:26:29 294

原创 Linux cache哪些情况下不会被释放

1. tmpfs中的文件会占用cache，未删除则不会释放cache2. shmget申请的共享内存，未删除则不会释放cache3. mmap 申请的带MAP_SHARED标志的内存，未调用

2019-08-14 15:21:12 2981

转载 Linux free详解

解释一下Linux上free命令的输出。　　下面是free的运行结果，一共有4行。为了方便说明，我加上了列号。这样可以把free的输出看成一个二维数组FO(Free Output)。例如：FO[2][1] = 24677460FO[3][2] = 10321516 1 2 3 4

2017-09-01 16:40:50 403

mplayer安装详解－让老师写的资料

源码包 mplayer-new.tar.gz <- 只能够在文本下看电影，听 MP3 编码包 essential-20071007.tar.bz2 <- 支持媒体格式 rm, rmvb, ....... 图形播放插件皮肤包 OSX-Mod-1.1.tar.bz2.tgz 字体包 font-arial-iso-8859-1.tar.bz2 tar xvf mplayer-new.tar.gz -C /usr/src/ cd /usr/src/mplayer make clean <- 先清垃圾 ( 由于我曾经编译过 ) tar xvf /share/source/mplayer/essential-20071007.tar.bz2 -C /usr/src cd /usr/src/mplayer ./configure --help <- 支持图形播放 ( --enable-gui ) 支持播放编码插件 (--codecsdir=) ./configure --enable-gui --codecsdir=/usr/src/essential-20071007 make make install 安装皮肤 tar xvf OSX-Mod-1.1.tar.bz2.tgz -C /usr/local/share/mplayer/skins/ mv /usr/local/share/mplayer/skins/OSX-Mod /usr/local/share/mplayer/skins/default 安装字体 mkdir /usr/local/share/mplayer/font tar xvf font-arial-iso-8859-1.tar.bz2 -C /usr/local/share/mplayer/font/ cp /usr/local/share/mplayer/font/font-arial-iso-8859-1/font-arial-18-iso-8859-1/* /usr/local/share/mplayer/font/ 测试 -> make install 后 mplayer, 文字播放 mplayer -vo X11 file.rmvb (123.mp3) gmplayer 图形播放 gmplayer file.rmvb (123.mp3)

2010-07-29