fcntl

The file I/O mentioned here refers to the non-cached;1. For IO operations with caching and IO operations without caching, see another article:Detailed with cache IO and without cache IOThe file IO (without the cached IO) in Linux is typically used

Socket Signal DriverIn order for a socket to be able to use the signal-driven I/O, at least the following 3 steps are required. 1. Installing the Sigio signal 2. The owner of the socket is set to the current process. Because the Sigio

Read and write operation of files under Linux (openreadwrite) turn http://www.2cto.com/os/201403/285837.html open (opens file)Correlation function Read,write,fcntl,close,link,stat,umask,unlink,fopenTable header file

This article introduces a so-called "patron saint of Linux file Systems", which is a program module that can observe the changes in the Linux file system in real time. It is very interesting and important to be able to observe the changes of the

1, the concept and role of asynchronous notification Impact: Blocking-The application does not need to poll the device for access Non-blocking--notification of interrupts That is, initiated by the driver, actively notifies the application 2. Linux

How to implement the Connect function with timeout function Principle:Looking at man connect today, I understand the cause of the mistake:EinprogressThe socket is non-blocking and the connectioncannot be completed immediately. It is possibleTo

Learn, record. int dup2 (int oldhandle, int newhandle); function function: Copying a file handle, Newhandle specifies that the dup2 and DUP differ by specifying the value of the new descriptor with the NEWFD parameter, and then closing the NEWFD

Define the int fcntl (int fd, int cmd,...) function ,...);DtcmdThere are several situations:F_dupfd is used to find the smallest and unused file description words greater than or equal to the ARG parameter, and copy the file description words of the

A simple UDP proxy Program As a supplement to 1. Why is this UDP program developed?The network condition is shown in the preceding figure . Our socks proxy has permissions (I believe many companies). When I write this program, I do not have the

"Mr. Wang, I have heard of icing on the cake." I patted the king's head and said. "You are also icing on the cake. I am a long bag on your head for the last few things you mentioned." Mr. Wang glared at me angrily. "Ah, why? I also deliberately

  Chapter 2: I don't know much about it. I think it's not that important.  3.1. Introduction Most file I/o on a UNIX system can be saved med using only five functions:Open,Read,Write,Lseek, AndClose. We then examine the effect of various Buffer

Welcome to reprint, reprint please indicate the source of http://blog.csdn.net/yankai0219/article/details/8453317 Article content 0. Sequence 1. Core Data Structure of nginx locks 2. Analysis of File locks 0. OrderThe strongly

1. Overview: (1) two most important UNIX operating systems: Processes and files (2) Five functions used by most file I/O: open, close, read, write, lseek. There are also file attribute operation functions: dup, fcntl (3) file I/O in UNIX operating

Implementation principle: Key code of asynchronous communication:  Crucial_code APP:signal(SIGIO, my_signal_fun);fcntl(fd, F_SETOWN, getpid());int Oflags = fcntl(fd, F_GETFL);fcntl(fd, F_SETFL, Oflags | FASYNC);DRIVE:static struct fasync_struct

Abstract: This paper introduces a new design method of message queue-based duplicate server communication software, which is different from the parallel server and general duplicate server communication software, this new software has the advantage

This article introduces a so-called "patron saint of Linux File System", which refers to a program module that can observe the changes of Linux File System in real time. Being able to observe changes in the file system in real time and make

The difference between a file stream and a file descriptor A) any process will open 3 Stream objectsby default at run time (stdin, stdout, stderr) and they all have corresponding file descriptors, each with a file descriptor of 0 ,1,2, the

Five I/O modes-blocking (default IO mode), non-blocking (common language pipeline), I/O multiplexing (IO multiplexing scenario), signal I/O, asynchronous I/OFive I/O modes:"1" Blocking I/O (I/O operations under Linux are blocking I/O by default,

The IOCTL is the physical property of setting and acquiring device files, and the physical characteristics of different device files are not the same. such as the serial port baud rate, display variable rate and so on. It is worth noting that the

objective of this section: exec replaces the process image of the EXEC Association function Group (EXECL, EXECLP, Execle, EXECV, EXECVP) One, exec replaces the process image on the process creation Unix takes a unique approach, It separates the