fcntl

The following functions are I/O (unbuffered I/O) functions without Caching: For the kernel, all opened files are described by a non-negative integer (called a file descriptor ). The following describes the file I/O functions: (1) Open This

Recently, I am working on a demo version of a server project. The process is as follows: Tcpserver-> WCF server-> Silverlight client/winfom Client The database uses SQLite and the persistence layer uses ibatis. TCP adopts the asynchronous

Go to http://blog.sina.com.cn/s/blog_5f84dc840100n2hb.html//source code sources include # include # include # include # include char buffer [4096]; int main (INT argc, char ** argv ){   Int delay = 1, n, m = 0;        If (argc> 1)    {   

About fcntl (FD, f_setfd, fd_cloexec) setting the close attribute during Exec Snd_ctl_hw_open# Define sndrv_file_control alsa_device_directory "controlc % I"Sprintf (filename, sndrv_file_control, card); // path/dev/snd/controlc0FD = snd_open_device (

#include # Include # Include # Include # Include # Include # Include # Include # Define maxline 100 VoidSetnonblocking (INT sock){Int opts = 0;Opts = fcntl (sock, f_getfl );If

First: Copy codeThe Code is as follows: import socket Import fcntl Import struct Def get_ip_address (ifname ): S = socket. socket (socket. AF_INET, socket. SOCK_DGRAM) Return socket. inet_ntoa (fcntl. ioctl ( S. fileno (), 0x8915, #

Use GTK and socket to implement a simple chat room-general Linux technology-Linux technology and application information. The following is a detailed description. (5ty ( When you use GTK and socket to implement a simple chat room, a "segment error"

File IO and system programming This article is the author read Tlpi (the Linux Programer interface Summary), in order to highlight the focus, avoid a cut, I will not too much to introduce the basic concepts and usage, I will focus on the

: This article mainly introduces the inter-process nginx communication-socketpair. if you are interested in the PHP Tutorial, refer to it. In nginx, the master process and worker process use a full-duplex communication method-socketpair. After the

In linux, the write operation principle, error causes, and troubleshooting methods are as follows: 1. introduction to the write function (1) contention between file I/O and standard I/O: according to the introduction in "advanced programming of UNIX

Part 1   In the network Program Some of the problems encountered in this section are summarized. Here we mainly aim at the summary of common TCP socket problems, which may cause errors. If you have any questions, please submit them.For more

1, IO Model introduction:There are five types of IO models in general:* Blocking IO* nonblocking IO* IO Multiplexing* Signal Driven IO* Asynchronous IOBut signal driven IO (signal-driven IO) is not commonly used in practice, so it only introduces

In multi-process development under Mac, Nsdistributedlock is a very handy mutex solution, and it's a common way to use it: 1 2 3 4 5 6 7 8 nsdistributedlock *lock = [[Nsdistributedlock] Alloc] Initwithpath:

The previous article is the file operation (chapter III), the code in the article in the file operation (code download).3.6 formatted output and input 3.6.1 printf, fprintf, and sprintf functions printf functions are capable of formatting and

First, IntroductionThe most important feature of the daemon is running in the background, which must be isolated from the environment before it is run, including non-closed file descriptors, control terminals, session and process groups, working

//Use FCNTL to lock files#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){Fd=open ("A.txt", o_rdwr| O_creat| O_EXCL, 0666);if (fd==-1){Perror ("File Open

Using Write\send to send datagrams Eagain:resource temporarily unavailable error under LinuxFirst 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,

Reprint please indicate source: http://blog.csdn.net/cywosp/article/details/389652391. Overviewin the Linux system, everything can be considered as a file, and the file can be divided into: Ordinary files, directory files, linked files and device

　　A process is an address space running one or more threads and the system resources required by these threads, and the PS-AJX command is used to print all current processes, where the state is expressed as: s for Sleep, R for run, D for wait, T for

As we know, the server concurrency model is usually divided into single-threaded and multithreaded models, where threads usually refer to "I/O threads", which are responsible for I/O operations, coordinating the allocation of "management threads" of