Linux

#include #include #include int main (int argc, char * * argv) { int i = 0; for (i = 0; i { printf ("errno.%0 2d is:%s\n ", I, strerror (i)); } return 0; } errno.00 is:successerrno.01 Is:operation not permittederrno.02 is:no such file or

Three points 1.SMTP Protocol 2. Build local mail server 3. Use external mail server to implement mail function 1.SMTP ProtocolThe SMTP (Simple Mail Transfer Protocol) is simply a mail Transfer protocol, a set of rules for sending

/******************** * Character device driver ********************/ (1) Character device driver Introduction A character device is a device that is accessed by a byte stream and is called a character device driver for a character device. This

a.introduction (32-bit system) Linux simplifies the segmentation mechanism so that virtual addresses (logical addresses) are always consistent with linear addresses, so Linux's virtual address space is also 0~4g (2^32). The Linux kernel divides

follow the wiki tutorial to compile kernel 4.4.y: My compiler is this one, set first 1, cross_compile=aarch64-linux-gnu- Configuration file in arch/arm64/configs/ 2, make arch=arm64 nanopi3_linux_defconfig 3, Make arch=arm64 Problem

Every time Linus Torvalds releases a mainline version of a new Linux kernel, this confusion is almost all about which kernel version is the latest "stable version." It's the new x.y, or the x.y-1 in front. Z. The latest kernel version is not too

If a user has a detailed understanding of a command, you can use the Man command. For example, to understand the details of the LS command, the command line writing format is as follows: [Root @teacherroot]# Mans ls Note: Commands are case-sensitive

Non-blocking I/O includes non-blocking input operations, non-blocking output operations, non-blocking receiving foreign connections, non-blocking initiating outgoing connections. The functions included are: Read, Readv, recv, Recvfrom, Recvmsg,

 After restoring the virtual machine Ubuntu, first, click on the virtual machine-install VMware Tools (Install vmware Tools), we will find the CD icon of VMware Tools on the Ubuntu system desktop. Double-clicking on this file icon will reveal

Crond resident command for task schedulingCrond is a command that Linux uses to execute programs on a regular basis. When the operating system is installed, the task Scheduling command is started by default. The Crond order will periodically check

http://blog.csdn.net/david_xtd/article/details/24542595 The use of SMS modem in Linux to send text messages, because the SMS modem uses USB Serial converter (chip for PL2303), the process and methods in the configuration and debugging in this

Reprint please indicate the source:http://blog.csdn.net/u011974987/article/details/52695647This article comes from: "Stromxu's Blog" preface Linux provides a large number of commands that can be used to efficiently perform a large amount of work,

Download Kali-linux: Click here to download Then use software such as the UltraISO, UNetbootin, or Linux boot disk creation tool under Windows to engrave the downloaded image into the U disk and turn on the boot. installation process: Here, just go

Original address: http://www.cnblogs.com/zfyouxi/p/5371317.html Purpose This article will introduce Linux under new files or folders, delete files or folder commands.Touch to create a new file, mkdir to create a new folder. RM is used to delete

origin:https://blog.csdn.net/wuyuwei45/article/details/8926858 Linux kernel2.6 in the above version, the USB device-driven interface changed to Gadget, in the Kernel/driver/usb/gadget directory mainly includes platform USB UDC drive and gadget

Linux kernel2.6 in the above version, the USB device-driven interface changed to Gadget, in the Kernel/driver/usb/gadget directory mainly includes platform USB UDC drive and gadget interface driver. Kernel/driver/usb/gadget SERIAL.C is a commonly

Create encrypted compressed files under Linux Method One:* 1. Create an encrypted zip file using the zip command:* 2. When extracting encrypted files, you will be prompted to enter your password: Method Two:* 1. Create a ZIP file using 7

in the Linux system, to build a service, is to modify its configuration file, in general, the configuration file changes the probability of the problem is not small, mostly some other factors cause the client and server access problems, Here are

1.Linux Server Installation Zabbix monitoring platformZabbix is an open source distributed monitoring platform based on web interface, can monitor the configuration parameters of various servers, support custom configuration and custom alarms, and

A ansible IntroductionDoes not need to install the client, through the sshd to communicateModule-based work, modules can be developed in any languageNot only supports command line use of modules, but also supports writing YAML format playbook, which