Linux

Standard C library functions gettimeofday (3C) NameGettimeofday, settimeofday-Get or set the date and time Synopsis# Include # Include   Int gettimeofday (struct timeval * TP, void *); Int settimeofday (struct timeval * TP, void *);

  Struct task_struct { // The current running status of the process Volatile long state;/*-1 unrunnable, 0 runnable,> 0 stopped */Unsigned int flags;/* per process flags, defined below */// Dynamic priority, static priority, and general priority Int

Interrupt service programs are usually executed when the CPU is disconnected, so as to avoid interrupting nesting and complicate the control. However, the CPU disconnection time cannot be too long; otherwise, the interruption signal may be easily

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--># Include # Include # Include Inline doubleNow (){Timeval TV;Gettimeofday (& TV, 0 );Double S = (TV. TV _sec );S + = (1e-6 * TV. TV _usec );Return

You have never used Windows or UNIX, but you only need to drag a file. I just know that the hard disk is C: D: e: But I have never studied partition tables. Maybe I will use VC to compile a program and get used to its integrated environment

This is a backup script mybackup. Sh I am using. Running properly in RedHat Linux 7.2 Mybackup. Sh#! /Bin/shUmount/mnt/bakMount/dev/sdb1/mnt/bak If ['date + % d' = '01'] # complete backup on the first day of every monthThenBakdir = "/mnt/bak/daybak/

In Linux, the name of the currently running program instance Is a process. For example, when you start Apache, the system assigns a process ID to it. Then you can use This ID monitors and controls this program. Process monitoring and control are

The original text is also transferred. The address is http://blog.csdn.net/freedom2028/article/details/7104014. This command is used to view detailed information about files and subdirectories in a directory. [Root @ gucuiwen root] # llTotal

The role of path:PATH is a string variable. When a command is input, Linux searches for the path recorded in the path. For example, you can enter the LS command in the root directory/or in the/usr directory, but the LS command is not in the two

  Download PPT:Click here to download the code PPTHttp://p.blog.csdn.net/images/p_blog_csdn_net/dedodong/cvsppt.gifNote: Right-click the file and choose Save As. After the file is downloaded, set the file suffix GIF to RAR. PPT content: CVS

We usually make some common functions into function libraries for use by other programs. Function libraries can be divided into static libraries and dynamic libraries. The static library will be connected to the target code during program

Debugging segment errors on Linux System Development Boards that do not have a GDB environment, roughly Locating Error Function locations I will not talk about the theoretical knowledge. If you want to know more, you can search for the article

  The blog has been opened for a long time, suffering from reading books and consolidating basic knowledge. I have always felt that I have no need to write a blog. After all, I did not know what to write. I have read the Linux driver twice, I have

After learning the embedded system for a period of time, the complexity of it is reflected in the need to deal with hardware and control hardware in the operating system. There is an instance on the development board. I modified it for ease of

First, there are two concepts: static library and dynamic library. Static Library: The program copies the static library to the executable file during the link, that is, after the executable file is generated, the executable file can still be

# DEFINE _ xopen_source# Include Char * crypt (const char * Key, const char * salt ); Link with-lcrypt. The above is a description of the crypt function. The parameter key is the string to be encrypted, and the salt is the string that affects the

Mounted Optical Drive Mount-T cd9660/dev/acd0/CDROM Detach an optical drive Umount-F/CDROM Mount USB Mount-T msdos/dev/da0s1/mnt/USB Unmount USB Umount/dev/da0s1   Load the kernel NIC Driver Module: -------------------------------- Modprobe pcnet32  

Fang juntan is original. If it is reproduced, please keep this note.   Currently, the. Bin installation package provided by QT provides drivers such as qmysql. You need to manually compile and add it.   Step 1; jump

C Standard functions do not seem to have platform problems: Let's take a look at this program: # Include # Include Int main () { Rename ("/tmp/ABC", "/tmp/BCD "); Perror ("Why :"); } The program runs properly. Change the

In Linux, the Select call process is as follows:1. the user-layer application calls select (), and the underlying calls poll ())2. The core layer calls sys_select () ------> do_select ()Finally, call the poll function of struct file_operations *