cdb meaning

First of all, I set the socket to asynchronous, and then when I use write to send data, the way is to loop a large amount of data, because it is asynchronous, Write\send will send the data submitted to the send buffer is immediately returned, do not need to confirm the data received. In this case, it is quite possible that the send buffer is filled up, causing the write\send to no longer commit the data to be sent to the buffer. So there is the resource temporarily unavailable error, Eagain

tree--lists directories and files in tree formUnder Linux, the colors of different files represent meaningBlue--CatalogueWhite--General documents, text, configuration, source code, etc.Light blue--linked files, mainly files created by the LN commandGreen file--executable fileRed file--compress file or package fileQuestion: Today, when I look at the source code, there is a problem, that is, when I click on a class or method, it will not jump to their definition of the beginning of the placeResolu

means that you rarely need to create it yourself.As hardware moves out of the computer, the names become more blurred. Fortunately, today's high-grade software blocks on Linux use easy-to-understand names for history and hardware. For example, well, Pango (http://www.pango.org/) is one of them.If you are interested in these things, then I suggest you read the grand, but some of US English history-centric, written by Eric S. Raymond Jargon File. It does not explain all the terminology used in Un

In Linux we have been exposed to RC scripts, RC commands, but what does "RC" mean here? 2015-01-27 Beijing Haidian NBSP;NBSP; Zhang Junhao 0we are using Linux systems, for example, when we use BusyBox to make the Linux root file system, the root file system directory has LINUXRC, as the kernel run up the first initprogram, such as a script to run automatically when booting, need and/etc/rc.d/rc.local this file to deal with, then what does RC mean? theRC "and it is" Runcommabbreviat

-Number between 0.00-1.00 NormalThe road manager will tell the driver that if the front is more congested, the driver will have to wait, if the front way unimpeded, then the driver can drive directly.Specifically:The numbers between the 0.00-1.00 indicate that the traffic is very good at this time, without congestion, and the vehicle can pass without hindrance.1.00 means the road is normal, but it is likely to worsen and cause congestion. At this point the system has no redundant resources, the

clock signal. is similar to SIGALRM, but calculates the CPU time that is consumed by the process.SIGPROF)Similar to SIGALRM/SIGVTALRM, but includes the CPU time used by the process and the time of the system call.Sigwinch)emitted when the window size changes.) SIGIOThe file descriptor is ready to start the input/output operation.SIGPWR)Power failureSigsys)An illegal system call.In the signals listed above, the program can not capture, block or ignore the signal is: sigkill,sigstopSignals that c

x N. Each of its entries would be either an integer or the character x. The value of a (I,J) indicates the expense of sending A message directly from node I to node J. A value of X for A (I,J) indicates that a message cannot is sent directly from the node I to node J.Note that for a node to send a message to itself does not require network communication, so a (i,i) = 0 for 1 The input to your program is the lower triangular section of A. That's, the second line of input would contain one entry,

Maybe we all understand these, as do not understand I guess the meaning of this interface, he is in order to call the next time to call the implementation of the interface in the class of the content, good around the mouth ah, write an example to stay for later seepay.php Copy Code code as follows: Interface Ipay { function Withmoney (); function withinternet (); } Class Dmeng implements Ipay { function Withmoney () { echo "Spend RMB to buy thing

What does 404 Not found mean? Why does it appear 404 Not Found? The meaning of 404 Not Found: 404 Not Found is a standard HTTP return code that, when a user enters a link, the IIS (Internet Information Services) on the server first detects whether the user-entered address link has the corresponding page information, and if there is no corresponding page information, Indicates that the user entered an invalid string of links, and IIS sends a 404 erro

This article mainly introduces the definition of the constructor parameters of type in Python, this paper uses an example of encoding to explain the function and meaning of the parameters of Python type, and the friends who need it can refer to The test code is as follows: The code is as follows: Class Modelmetaclass (Type): def __new__ (cls,name,base,attrs): Logging.info ("CLS is:" +str (CLS)) Logging.info ("name is:" +STR (name)) Logging.info

Iis〓 Profile 〓 The meaning of the IIS system error---" 〓 Body 〓 error Message 400 Bad Request (wrong requests) 401.1 Logon failed (Logon failure) 401.2 logon failed due to server configuration (logon failure due to server configuration) 401.3 unauthorized due to ACLs on resource (due to ACLs on resources, unauthorized) 401.4 Authorization failed by filter (due to filters, authorization failed) 401.5 Authoriz

1. DefinitionThe __read_mostly primitive defines the variable to be stored in the . data.read_mostly segment, and the prototype is defined in include/asm/cache.h: #define __read_mostly __attribute__ ((__section__ (". data.read_mostly")) 2. RoleBecause __read_mostl modified variables are placed in the . data.read_mostly segment, we can define the data that is often needed to be read as a __read_mostly type, so When the Linux kernel is loaded , the data is automatically stored in the cache to

Permissions for the file :　　R : The actual contents of this file can be read .　　W: Can edit , add , or modify the contents of the file ( but not delete the file), if there is no r permission, the W .　　x : The file has permission to be executed by the system and can be deleted .Permissions for the folder :　　R : has permission to read the list of directory structures .　　W: There are permissions to change the directory structure list .　　　 such as: Create new files and directories, delete existing

In Linux/unix, the information generally seen on the screen is from stdout (standard output) or stderr (standard error Output). Many people will ask, output is output, sent to the screen does not have, why is divided into stdout and stderr it? That is because in the server environment, almost all of the programs are run in background, so, in order to facilitate debug, generally in the design process, the STDOUT sent to/saved to a file, the wrong information stderr saved to different files.Which

First, there is red in front of the project! That indicates that the path to the package in the Classpath in the project is wrongWorkaround:Right-click project name BuildPath---> Configure Build paht ... , and then there are several tabs above to find the package that appears in libraries with the Red Cross in the path error. Modify the current path of the corresponding package into classpath. Then go back to Eclipse and F5 refresh the project.My method: Under the Project Package folder mvn Ecli

name is www.rol.cn.net.The hypertext file (the file type is. html) is the talk1.htm under the directory/talk.This is the address of the chat room, which can enter the 1th room of the chat room.2. The URL of the fileWhen a file is represented by a URL, the server is represented by a filename, followed by information such as the host IP address, the access path (that is, the directory), and the file name.Directories and file names can sometimes be omitted, but the "/" symbol cannot be omitted.Exa

No intention to find MU class network to modify the functional bug of personal signatureThe issue of modifying a personal signature failedImageAfter testing, like this two lines of text in the middle of a newline, save will prompt error,ImageAnd if you do not wrap, you can succeed:ImageImageChrome for browsers0.0 It may be that the web is not allowed to do so. In addition to let me change two times the information has not been successful and no impact. Feedback has been submitted.I do not know t

The main time information in Ython's Os.stat is three: St_mtime,st_atime,st_ctime.1. St_mtime:time of Last modification The last modification time, if a file is written using the Write function, the time of the file is changed 2. St_atime:time of last access The last access time, if a file is read using the Read function, it will change the time of the file 3. St_ctime:time of last change the last time the file permission is modified, if you use chmod to modify the permissions of the file, t

, __set, __isset, __unset, __sleep, __wakeup, __toString, __set_state, __clone, __autoload __autoload The __autoload function, which is called automatically when trying to use a class that has not yet been defined. By calling this function, the scripting engine has the last chance to load the required classes before PHP fails. If you are defining a global auto-load class, you must register the processing class with the PHP standard library using the Spl_autoload_register () method: Note: Except

, phrases such as "is issued" or "This is" are recognized incorrectly by the expression.In a JScript expression, the global flag (' G ') after the regular expression indicates that the expression will be used to find as many matches as possible in the input string. Case sensitivity is specified by the case sensitivity tag (' I ') at the end of the expression. A multiline tag specifies a potential match that may appear at both ends of a newline character. For VBScript, you cannot set various toke