Linux

1. In the interrupt processing function: The NIC receives a frame ----------------------> ------------------------〉 Cause interruption -----------------> -------------------〉 The CPU calls the corresponding interrupt handler (pointing to the

The first parameter of the CHMOD command can be a number, which is composed of three numbers, representing the user, group, and other attributes respectively. Different attributes can have different execution permissions. Different execution

Scenario: Process a creates shared memory and reads data. process B connects to the shared memory to write data. Enter end to end the process. Application instance: Header file: shm_com.h # Include # include # include # include # include

1. FindProgram(For example, the program name is MySQL) process PID Number and force stop the process: (1) first use PS aux | grep MySQL to find the MySQL process id pid. (2) Use kill-9 PID (-9 indicates force stop) to stop the process whose

1. Prepare Images Divides the mouse into two types: Dynamic and Static. Dynamic, such as the waiting state of the mouse, most of the mouse is static Dynamic: Number of animation frames X number of types Static: number of types of the size 2. Write

Linux LowerHow to install FFMPEG Keyword: Linux FFmpeg Finally installed, record the process First install various Decoder 1. LameLame-3.97.tar.gz URL: http://sourceforge.net/project/showfiles.php? Group_id = 290 & package_id = 309 The

Production systems used by Alibaba--------------------------------------------------------------------------------Fedora 7Redhat Enterprise 3.x, 4.X, 5.xSuSE Linux Enterprise Desktop 10-sp1Opensuse 10.1, 10.2Ubuntu 7.04-------------------------------

In short, a segment error occurs when you access the wrong memory segment. Generally, you do not have the permission or the corresponding physical memory exists, especially when you access the 0 address. IGenerally, a segment error means that the

If you want to program one side in Linux, you must master the skills, that is, view help. Maybe you are used to Google or Baidu for help, but use the following method to get information faster and learn more systematically. There are two methods to

[Concept] A process is a running activity of a program with certain independent functions on which a dataset is closed. It is an independent unit for the system to allocate and schedule resources; A binary thread is an entity of a process and the

The top command is a common performance analysis tool in Linux. It can display the resource usage of various processes in the system in real time, similar to the Windows Task Manager. The following describes how to use it.   I. Overview Top-01:06:48

Kill-l1) sighup 2) SIGINT 3) sigquit 4) sigill5) sigtrap 6) SIGABRT 7) sigbus 8) sigfpe9) sigkill 10) SIGUSR1 11) SIGSEGV 12) sigusr213) sigpipe 14) sigalrm 15) sigterm 17) sigchld18) sigcont 19) sigstop 20) sigtstp 21) sigttin22) sigttou 23) sigurg

Run the RPM installation package Binary and source packages. The binary package can be directly installed in the computer, and the source code package will Rpm is automatically compiled and installed. Source code packages often use SRC. RPM as the

1. Preface Because most embedded Linux development uses a cross-compiling environment, it is inevitable that files are frequently transferred between the Development Board and the PC environment. Of course, the most convenient thing is network

// Note that you can use data = Data * 6.25 on bare metal to increase the temperature by 100 times, but not in the kernel, however, data = Data * 625/100 can be used; // I checked it online. It seems that the kernel does not support floating point.

# Include # Include Typedef struct mac_header { Unsigned char d [6]; Unsigned char s [6]; Unsigned short type; } Mac_header; Void packet_handler (u_char * Param, const struct pcap_pkthdr * Header, const u_char * pkt_data ); Int main (INT argc,

  For beginners who come from windows, they often encounter problems. After writing something in VI, they habitually press Ctrl + S to save it, and then they die there. They don't reflect it at all, so they have to restart, use Alt + F2/3/4 in

Scenario: Process a writes messages to the message queue, while process B reads messages from the message queue. Different from the previous pipeline, the message queue is relatively independent from the process and does not require the process to

Scenario Description: Multiple Clients communicate with the server at the same time. The client sends the Buf to the server for processing. Convert all English letters in Buf into uppercase letters and return them to the client. Implementation

In VI/vim, you can use the: s command to replace the string. In the past, we used only one format to replace the full text. Today we found that there are many ways to write this command (VI is really powerful, and there are still a lot to learn).