Linux

The following parameters are frequently mentioned in optimizing the network tuning of Linux. Setup in/etc/sysctl. conf # Network tunningNet. ipv4.tcp _ fin_timeout = 35Net. ipv4.tcp _ keepalive_time = 1800Net. ipv4.tcp _ keepalive_intvl = 35Net.

SocketProgramPort windows to Linux:   1) header file Winsock. h/winsock2.h in Windows Sys/socket. h in Linux Error Handling: errno. h   2) initialization Wsastartup is required for Windows. Not required in Linux   3) Disable

ASignalIs a software interrupt delivered to a process. the operating system uses signals to report exceptional situations to an executing program. some signals report errors such as references to invalid memory addresses; others report asynchronous

PS display instructions:Linux @ Ubuntu ::~ $ PS auxwf | lessUser PID % CPU % mem vsz RSS tty stat Start Time CommandRoot 2 0.0 0.0 0 0? S [kthreadd]Root 3 0.0 0.0 0 0? S/_ [ksoftirqd/0]Root 5 0.0 0.0 0 0? S/_ [kworker/u: 0]Root 6 0.0 0.0 0 0? S/_

Use history {$ num} to view the recently used $ num commands. The default value is 500; 1. CTRL + R: (reverse-I-search, the terminal will scroll to display your History commands. When you find the appropriate historical command, you can directly [

In Linux 2.6, these two macro products are often seen, for example: -------------------------------------------------- If (likely (sndcmd )){ Chip-> Functions func (MTD, nand_1__read0, 0x00, page ); Sndcmd = 0; } -------------------------------

I learned something again today. Remember: 1: to create a git server repository, install git first. 1) install OpenSSH-server (SSH: Security shell ); Sudo apt-Get install OpenSSH-Server 2) create a warehouse directory and initialize the

4. Migration Project and description 4.1 modify the starting address of the compressed kernel code Modify file: uClinux-Dist/linux-2.4.x/ARCH/armnommu/boot/makefileModification content:Ifeq ($ (config_board_mba44), Y)Ztextaddr = 0x0c100000Zreladdr =

A few days ago, I assigned my laptop a USB Nic. This is because there is no desktop in the dormitory. In the past few days, I had a desktop computer, but I didn't have a dual Nic. homeshare when I used Netcom,In addition, due to the instability of

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. Generally,A segment error means that the

Ubuntu has a gnome Bluetooth Desktop Manager, which is easy to use, but you cannot understand the details of this tool. Let's look at the method below and use the script written by bluez, I have studied it for Embedded purposes.     1. Load the

# Include 1. Create int pthread_create (pthread_t * tid, const pthread_attr_t * ATTR, void * (* func) (void *), void * Arg); ATTR: thread attributes include: priority, initial stack size, whether it should be a daemon thread. By default, null is

Open the file name of the dynamic library specified in the dynamic library function (dlopen or loadlibrary), and search for the dynamic library in the following order when the program is running 1. Search Path of the library file: 1. In the

Without device drivers, there is no functioning system. User Activities are saved med by means of a set of standardized cballs that are independent of the specific driver; mapping those callto device-specific operations that act on real hardware is

Linux @ Ubuntu ::~ $ RouteKernel IP routing tableDestination gateway genmask flags metric ref use iface192.168.8.0*255.255.255.0 u 0 0 0 eth0Default 192.168.8.1 0.0.0.0 ug 0 0 0 eth0=-=The first line indicates that the network address of the host is

1. I believe you have seen a lot about FFMPEG on the Internet. I will not introduce it here. I will share the code below and share some of my experiences with FFMPEG. 2. Linux FFMPEG usage steps Initialize FFMPEG library av_register_all () Read

First, you have to have at least one camera before learning v4l2. In addition, it is best to specify a plan for you to learn in a targeted manner and set a time so that you have a sense of urgency. It is not very difficult to get started with v4l2

Download this mp3-(right click) Start the Linux Device Driver journey with music. The next few logs will record the compilation and testing of the "character device driver. I chose to paste code and describe to analyze and design our driver, because

After one or two days of exploration, I basically had a preliminary understanding of Linux control hardware: the difference between hardware control in Linux and hardware control in a non-operating system is that the hardware address is different.

CreateThread:Int pthread_create (pthread_t * restrict thread, Const pthread_attr_t * restrict ATTR, Void * (* start_routine) (void *), void * restrict Arg ); Parameters:Thread output thread ID ATTR thread attribute, default: NULL start_routine