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linux programming

This is my own linux recording. Time in Linux programming. Kernel measures the passage of the time in three different ways:. Wall time - - measuring absolute time. Monotonic time - - calculating relative time. Unix systems represent absolute time as the number of elapsed seconds since the epoch. Which is defined as 00:00:00 UTC on the morning of 1 January 1970. SO, even absolute time is, at a low level, relative time. The following table shows some useful functions for uing time:. CLOCK PROCESS CPUTIME ID.

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linux programming | penig.blogspot.com Reviews
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This is my own linux recording. Time in Linux programming. Kernel measures the passage of the time in three different ways:. Wall time - - measuring absolute time. Monotonic time - - calculating relative time. Unix systems represent absolute time as the number of elapsed seconds since the epoch. Which is defined as 00:00:00 UTC on the morning of 1 January 1970. SO, even absolute time is, at a low level, relative time. The following table shows some useful functions for uing time:. CLOCK PROCESS CPUTIME ID.
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linux programming | penig.blogspot.com Reviews

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This is my own linux recording. Time in Linux programming. Kernel measures the passage of the time in three different ways:. Wall time - - measuring absolute time. Monotonic time - - calculating relative time. Unix systems represent absolute time as the number of elapsed seconds since the epoch. Which is defined as 00:00:00 UTC on the morning of 1 January 1970. SO, even absolute time is, at a low level, relative time. The following table shows some useful functions for uing time:. CLOCK PROCESS CPUTIME ID.

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linux programming: pulseaudio module-detect analyse

http://www.penig.blogspot.com/2011/01/pulseaudio-module-detect-analyse.html

This is my own linux recording. 1 run this function: "int pa init(pa module*m)". Pa bool t just one = FALSE;" allow more than 1 devices. Function pa modargs new. Modargs.c" analyse the input args, get the args' value such as: "u32, bool, s32." and store in pa hashmap list. For ALSA,OSS,SOLARIS, each has different device node, so the have different codes. And for WIN32, it does nothing except load module "module-waveout". There only analyse ALSA. Ifdef HAVE ALSA- use for alsa. 2 "detect alsa" function:.

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linux programming: ubuntu qq for linux自动关闭的问题解决方法

http://www.penig.blogspot.com/2010/12/ubuntu-qq-for-linux.html

This is my own linux recording. Ubuntu qq for linux自动关闭的问题解决方法. Ubuntu 10.04还是存在这个问题 哎. 1 在终端输入命令代码:sudo vim /usr/bin/qq. Bin/sh下面一行,cd /usr/share/tencent/qq/前面一行的位置插入代码:. Export GDK NATIVE WINDOWS=true. 3 最终修改后的QQ脚本配置文件如下,保存关闭即可。 Export GDK NATIVE WINDOWS=true. 4 重启QQ,qq不再自动退出和关闭了。 订阅: 帖子评论 (Atom). Android gstreamer debug information can not work. Ubuntu qq for linux自动关闭的问题解决方法. Devkit8000,android,NFS boot. Gstreamer Why Cant Use the New Added Plugins. How to Use Gstreamer Debug System.

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linux programming: android gstreamer debug information can not work

http://www.penig.blogspot.com/2010/12/android-gstreamer-debug-information-can.html

This is my own linux recording. Android gstreamer debug information can not work. Gst-launch-0.10 - gst-debug-level=1 audiotestsrc! Could not open converter from 'ASCII' to 'UTF-8'. 在gconvert.c g convert()中添加了以上代码自己转换,将ASCII 转换成 UTF-8,debug 消息就可以打印出来了. 订阅: 帖子评论 (Atom). Android gstreamer debug information can not work. Ubuntu qq for linux自动关闭的问题解决方法. Devkit8000,android,NFS boot. Gstreamer Why Cant Use the New Added Plugins. How to Use Gstreamer Debug System. Enjoy 图片窗口模板. 由 Blogger.

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linux programming: 十二月 2010

http://www.penig.blogspot.com/2010_12_01_archive.html

This is my own linux recording. Git is the fast version control system. Now I am studying how to use git. Here are the commands for common using:. To check out sources. i.e. Download pulseaudio sources:. Git clone git:/ git.0pointer.de/pulseaudio.git. To show your working tree status. To update the codes to the newest version. Git pull origin master. Add or edit your file. Commit your new file. Git add your-file git commit -m 'log'. Push your change to remote repository. Git push origin master. Add one l...

5

linux programming: Time in Linux programming

http://www.penig.blogspot.com/2011/01/time-in-linux-programming.html

This is my own linux recording. Time in Linux programming. Kernel measures the passage of the time in three different ways:. Wall time - - measuring absolute time. Monotonic time - - calculating relative time. Unix systems represent absolute time as the number of elapsed seconds since the epoch. Which is defined as 00:00:00 UTC on the morning of 1 January 1970. SO, even absolute time is, at a low level, relative time. The following table shows some useful functions for uing time:. CLOCK PROCESS CPUTIME ID.

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chenrui: study kernel(3) -- memory,vfs

http://chennrui.blogspot.com/2011/07/study-kernel3-memoryvfs.html

Study kernel(3) - memory,vfs. 1. 逻辑地址:每个逻辑地址都有一个段和偏移量组成,偏移量指明从段开始的地方到实际地址之间的距离。Linux中逻辑地址总是与线性地址一致。 2. 线性地址:虚拟地址。32位系统有4G的线性地址,64位系统有8G线性地址。 3. 物理地址:物理内存的实际地址。 页:线性地址被分成固定长度为单位的组。页内部连续的线性地址被映射到连续的物理地址中。页既指一组线性地址,又指这组地址中的数据。Linux每一页有4KB容量。 页框:或物理页。一个页框包含一个页,因此页框长度与页长度一致。页可存放在任何一个物理页中。页框就是物理内存。 内核中用页述符struct page描述每一个页框的状态信息,所有的页描述符都保存在mem map数组中。 Unsigned long flags; / 描述页框状态. Atomic t count; / 页框的引用计数. Atomic t mapcount; / 页框中页表数目. Void *virtual; / 页框的虚拟地址. Slab的使用:(struct task struct). Linux操作系统采用虚拟内存管理...

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chenrui: 一月 2011

http://chennrui.blogspot.com/2011_01_01_archive.html

The relationship between pad and caps. Name template(eg:wavparse src, wavparse sink) -direction(src or sink) GstStaticPadTemplate- -presence(Sometimes, Always, request) -GstCaps(String is stored in GstStruct) -GstStaticCaps- - -String(support caps) gst static pad template get() -GstObject V GstPadTemplate- - - -direction -presence -GstCaps gst pad new from static template() V -GstObject GstPad- - - - -GstPadTemplate . Add pad into element and set relation. Set pad active from srcpad to sinkpad. GST STATE...

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chenrui: tcpip stack(2) -- L3 send and receve

http://chennrui.blogspot.com/2011/08/tcpip-stack2-l3-send-and-receve.html

Tcpip stack(2) - L3 send and receve. Struct msghdr 保存数据。在. Struct sk buff 保存数据,这个结构被整个网络协议栈使用,如. UDP 等。并且其中的成员变量在结构从一层向另一层传递时解析本层的数据头。 Ip router output flow 根据saddr和daddr在rt hash table中查找路由表。 如果没有找到则查找fib,并 mkroute output创建struct rtable。将rtable加入rt hash table. Neigh create:根据rtable- dst entry创建struct neigh邻居,设置定时操作neigh timer handler,. Ip append data 将大数据分片,创建struct sk buffer,并将其加入struct sk- sk write queue. Ip push pending frames. Ip finish skb 构造ip头. Ip finish output 如果在hh cache中找到daddr信息则将数据传到driver.

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chenrui: study kernel(2) -- sync, interrupt

http://chennrui.blogspot.com/2011/07/study-kernel2-sync-interrupt.html

Study kernel(2) - sync, interrupt. Linux提供了一系列C语言函数来实现内核中的原子操作,这些函数又分为两类,分别针对bit变量和整数变量进行原子操作。它们的共同点是在任何情况下都是原子的,内核代码可以安全的调用它们而不被中断,而且它们都依赖底层CPU的原子操作来实现-所有这些函数都是CPU架构相关的。其实现在atomic.h和bitops.h中. CPU具备屏蔽中断和打开中断的功能,这项功能可以保证正在执行的内核控制路径不被中断处理程序所抢占,防止某些竞争条件的发生。Linux提供了local irq disable()/local irq enable(),local irq save()/local irq restone()来实现屏蔽/开启中断的功能。 信号量为了解决多个内核控制路径竞争资源的问题,这些内核控制路径可能是单处理器系统中分时执行的控制路径,也可能是多处理器系统中的并行执行的控制路径。在试图获得信号量的时候,如果信号量繁忙,相应的内核控制路径会挂起,直到信号量被释放...A 代码量应越少越好,以便中断函数的快速执行。 上述两个条件中,...

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chenrui: tcpip stack(1) -- init

http://chennrui.blogspot.com/2011/07/tcpip-stack1-init.html

Tcpip stack(1) - init. Static struct vfsmount *sock mnt read mostly;. Static int init sock init(void). Skb init(); / 为socket buffer创建高速缓存. Init inodecache(); / 为struct sock alloc创建高速缓存. Register filesystem(&sock fs type);. Sock mnt = kern mount(&sock fs type);. Static struct file system type sock fs type = {. Name = "sockfs",. Mount = sockfs mount,. Kill sb = kill anon super,. Static struct file system type *file systems;. Int register filesystem(struct file system type * fs). Struct file system type * p;.

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chenrui: 十二月 2010

http://chennrui.blogspot.com/2010_12_01_archive.html

Man trap, trap - help都没有,网上搜到格式如下:. Trap "echo "hello world "; echo $1". 额。。。没反应! 原来kill 命令发出信号SIGTERM,如果想用SIGKILL需要执行kill -9。 Trap为信号捕捉器,当接收到指定信号后执行" 中的命令。 1 想查看当前文件夹及子文件夹里有没有文件名为“abc”的文件. 2 想查看当前文件夹及子文件夹里有没有”xyz”目录. Find -type d -name xyz. Type:表示设定类型,d表示文件夹类型,可以替换为f(普通文件)、l(链接文件). 3 想找出当前文件夹及子文件夹里所有后缀是”.txt”的文件. Find -name “*.txt”. 4 想查找当前目录及其子文件夹中“roc”用户自己的文件有哪些. User:用于设定所属用户的名称,此处可替换为-group,即所属用户组的名称. Find -regex ‘.*b.*3′. 7 如果想全部输出用find命令查找出的”*.abc”文件的内容. 输出/tmp/code中所有.h,.c文件长度的总和. Eeese 23 22 fg...

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chenrui: iptables command and rules

http://chennrui.blogspot.com/2011/05/iptables-command-and-rules.html

Iptables command and rules. Iptables [-t table] command [match] [target]. Iptables有5个链:PREROUTING,INPUT,FORWARD,OUTPUT,POSTROUTING;4个表:filter,nat,magle,raw. 4个表的优先级由高到低为:raw- mangle- nat- filter. 选项允许使用标准表之外的任何表。表是包含仅处理特定类型信息包的规则和链的信息包过滤表。该选项不是必需的,如果未指定, 则. 65306;表用于一般的信息包过滤。包括链表:. 65306; 用于转发,与nat table 相关性较高。 65306;主要在进行来源与目的之 IP 或 port 的转换,与 Linux 本机较无关,主要与 Linux 主机后的区域网路内电脑较有相关。包括链表:. 訂閱: 張貼留言 (Atom). Iptables command and rules. Time in Linux programming. Run Android Java console program.

chennrui.blogspot.com chennrui.blogspot.com

chenrui: 八月 2011

http://chennrui.blogspot.com/2011_08_01_archive.html

Tcpip stack(2) - L3 send and receve. Struct msghdr 保存数据。在. Struct sk buff 保存数据,这个结构被整个网络协议栈使用,如. UDP 等。并且其中的成员变量在结构从一层向另一层传递时解析本层的数据头。 Ip router output flow 根据saddr和daddr在rt hash table中查找路由表。 如果没有找到则查找fib,并 mkroute output创建struct rtable。将rtable加入rt hash table. Neigh create:根据rtable- dst entry创建struct neigh邻居,设置定时操作neigh timer handler,. Ip append data 将大数据分片,创建struct sk buffer,并将其加入struct sk- sk write queue. Ip push pending frames. Ip finish skb 构造ip头. Ip finish output 如果在hh cache中找到daddr信息则将数据传到driver.

chennrui.blogspot.com chennrui.blogspot.com

chenrui: 二月 2011

http://chennrui.blogspot.com/2011_02_01_archive.html

2月11日,NOKIA宣布,与微软达成广泛战略合作关系,并将Windows Phone作为其主要的智能手机操作系统。并且MeeGo和移动解决方案业务主管阿尔伯托·托雷斯(Alberto Torres)已经于2月10日离职。 同时有消息,首款MeeGo系统手机Nokia N9-00也不幸夭折。传说中的MeeGo,被视为诺基亚在高端智能手机市场上对抗苹果和谷歌的利器,看来大势已去。不知Intel有何感想,怀胎10月,流产了。 Tieto,跟在Nokia后的小弟,你又何去何从?!。。。命运掌握在自己手中睡觉才踏实,觉醒吧。 訂閱: 文章 (Atom). Time in Linux programming. Run Android Java console program. Chennrui. Watermark範本. 由 Blogger.

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chenrui: study kernel(1) -- process, schedule

http://chennrui.blogspot.com/2011/07/study-kernel1-process-schedule.html

Study kernel(1) - process, schedule. Task struct 定义如下:. Struct task struct {. Volatile long state; / 进程运行状态. Struct thread info; / 线程描述符. Struct mm struct; / 描述内存存储信息. Struct tty struct; / 与进程相关的tty. Struct fs struct; / 当前目录. Struct signal struct; / 所接收的信号. 1. TASK RUNNING:进程正在执行或是可执行的,调度器可将其加入运行队列(runqueue)。 3. EXIT ZOMBIE:进程已经结束,但此时任占用内核栈、thread info、task struct,为了向父进程提供信息。当父进程调用了wait4()后,信息会被释放。 4. TASK STOPPED:进程停止运行。 Asmlinkage int sys fork(struct pt regs regs). Struct pt regs regs;. 普通进程通过静态优先级nice...

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linux programming

This is my own linux recording. Time in Linux programming. Kernel measures the passage of the time in three different ways:. Wall time - - measuring absolute time. Monotonic time - - calculating relative time. Unix systems represent absolute time as the number of elapsed seconds since the epoch. Which is defined as 00:00:00 UTC on the morning of 1 January 1970. SO, even absolute time is, at a low level, relative time. The following table shows some useful functions for uing time:. CLOCK PROCESS CPUTIME ID.

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Penig im Wandel der Zeit. Geschichte der Stadt Penig. Zur Geschichte der Stadt. EFRE - Brachenrevitalisierung Uhlandstraße 24. EFRE - Gewerbebrache Leipziger Straße 64c. LEADER- Gebiet Land des Roten Porphyr. Grundstücke in der Peniger Innenstadt. Grundstücke in den Ortsteilen. Integriertes Quartierskonzept Historischer Stadtkern. Christusgemeinde Penig e.V. Wahl zum Bürgermeister und zum Landrat. Kita Die kleinen Zwerge. Schulhort der Erich Kästner Grundschule. Schulhort der GS Langenleuba-Oberhain.

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