fcntl

This program, the client through the server for group chat. The main lecture is two points: 1. How to make non-blocking mode. 2.select of rough explanation (impatient can skip, look directly at the back code) First, look at the basic logic of this

Chapter5 deep Dive into file I/OThis section describes another system call related to file operations: Multi-purpose Fcntl () and shows one of its applications reading and setting the status flags for open files.5.1 Atomic operating and competitive

This article mainly introduces the Python daemon and script run, small series feel very good, and now share to everyone, but also for everyone to do a reference. Let's take a look at it with a little knitting. First, Introduction The most

C function parameters are represented by both parameters and input parameters.// Use fcntl to lock the file# Include "stdio. h"# Include "unistd. h"# Include "fcntl. h"Int main (){Int fd;Struct flock lk;Int r;Fd = open ("a.txt", O_RDWR );If (fd =-1){

The user interface for the Linux socket. This BSD-compatible socket is a unified interface between the user process and the Kernel network protocol stack, each protocol module belonging to a different protocol family, such as Pf_inet, Pf_ipx,

This article is senlie original, reproduced Please retain this address: http://blog.csdn.net/zhengsenlie Next, I will introduce several different versions of the same tcp client program, including the stop and other versions, the Select and

UNIX file I/OFor most UNIX files, I/O only requires five functions: open, read, write, lseek, and close, which are often called unbufferedi/o without caching.Quasi-I/O functions ). Term-without caching means that each read and write calls a system

I. Overview Common functions for UNIX file operations include:Open,Close,Creat,Lseek,DUP,Dup2,Fcntl, The open, creat, and fcntl functions must contain the header file , The other functions must contain the header file . In Linux, the man command can

VII. Data ManagementMemory managementMalloc,free,realloc and windows are the same, both ANSI C.In fact, the application does not have direct access to physical memory, or it can obtain much larger memory space than actual memory through malloc,

Previous section: http://blog.csdn.net/mybelief321/article/details/8989755 5 basic function Functions open (), read (), write (), Lseek (), and Close () The implementation of the file open, read/write operations, this section will discuss how the

As you all know, under Linux, everything is file, so familiar with Linux file operation, Linux is the basis for programming. Cut the crap, get into the subject. In Linux, the file descriptor is used to represent the common file of the device file,

To discuss the issue of writing to the same file by multiple processes in a concurrent environment, we will involve knowledge of file sharing. Before we begin, let's discuss some knowledge about file sharing. 1. File sharing UNIX systems support the

Address: http://www.iteye.com/topic/309442   This function affects an open file referenced by the FD parameter. # Include Int IOCTL (int fd, int request,.../* void * Arg */); Return 0: Success-1: Error The third parameter is always a pointer, but

  The first application running after Linux kernel is init,Init is the next application in Linux. Its source code is in system/CORE/init. Main is the entry of the application. From the main () function, you can know the main functions of

When learning how to use libevent. Example 1:Libevent_echosrv1.c /** Libevent echo server example. */# include # Include # Include /* For inet_ntoa. */# include/* required by event. H. */# include # Include

  4-day OS installed... Haha, a lot of GAINS. Remember Master Steven S.Best references: 1. Master from the Internet. 2. Linux man command: Man 7 signal, MAN 7 socket. 3. UNP V1 Chapter 1.Article 1: Overview Signal-driven Io, not asynchronous

A pipeline is a way to allow only inter-process communication between relationships, and a pipe is created by the function pipe to read,write read and write operations. #include int pipe (int pipefd[2]);Parameter Pipefd[2] Array returns

The second more general way to make a connect call time-out is to make the socket nonblocking, and then wait for it to complete with select. This approach avoids many of the problems encountered when using alarm, but we must admit that there are

Reading the time found that the problem is not the answer, so I want to put their own results posted, and share with you!First put the title on it:/*********** The posix.1 mentioned in section 8.10 requires that open directory streams be closed

Linux's I/O mechanism has gone through several stages of evolution: (1) Synchronous blocking I/O: User processes perform I/O operations until I/O operations are completed. (2) non-blocking I/O synchronization: the user program can set the O_NONBLOCK