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I. File System The purpose of a file system is to organize a file into a logical hierarchy that contains directories, connections, and other physical block devices. It does not care about the structure of the underlying physical block device. When

This article is senlie original, reproduced Please retain this address: http://blog.csdn.net/zhengsenlie /*** TCP: use non-blocking connect**/# Include "unp. H"IntConnect_nonb (INT sockfd, const Sa * saptr, socklen_t Salen, int nsec){Int flags, N,

In windows, asynchronous IO can be implemented through WSAEventSelcet to implement asynchronous notifications for IO read/write operations. In UNIX, there is also a type of SIGIO signal to implement the IO asynchronous notification mechanism. To

0. Related header files # Include # Include # Include # Include # Include # Include # include # Include # Include # Include # Include # Include # Include 1. Socket InitializationS = socket (af_inet, sock_dgram,Ipproto_udp ); If(S =-1)Return-1; S

1. Non-blocking I/O Non-blocking I/O allows us to call I/O operations that are not always blocked, such as open, read, and write. If this operation cannot be completed, an error is returned immediately, indicating that the operation will continue to

Http://hi.baidu.com/ahtaria/blog/item/969ae4447eaa59076a63e57d.html Libpcap focuses on the BPF (BSD Packet Filter) packet filtering mechanism. BPF was designed in 1992 to solve the inefficiency of the existing filtering mechanism. The BPF procedure

Asynchronous notification for Linux Device Driver Programming The combination of blocking and non-blocking access and poll functions can better solve the reading and writing of devices, but it is more convenient if asynchronous notifications are

This article focuses on the application and driver layers to explain the Linux asynchronous notification I/O mechanism, hoping to help readers. Due to my limited knowledge, please point out any errors. Thank

Linux File lock: synchronization between processes tutorial, linux File lock I. Scenarios In addition to semaphores and shared memory (atomic operation) synchronization, multi-process synchronization can also be implemented using File locks. II.

Inter-process communication (5) 1. Preface all the examples in this article are based on the RHEL6.5 platform. The previous article introduced anonymous pipelines. Click this link. 2. A major restriction for introducing MPs queue applications is

Cloexec is the new kernel. This option is to put the fcntl settings in open for atomic operations, to avoid the possibility that fcntl may appear in the multi-threaded program while other threads are in fork + execve,Although fork is rare in the

The getch () function source code found on the internet is as follows: #include #include #include int getch(void) {struct termios tm, tm_old;int fd = STDIN_FILENO, c;if(tcgetattr(fd, &tm) After testing, the direction keys cannot be used normally

Http://blog.chinaunix.net/u2/82646/showart_1359552.html Open (open a file) Related functions: read, write, fcntl, close, Link, stat, umask, unlink, and fopenHeader file # include # Include # Include Define the int open (const char * pathname, int

The driver is running in kernel space and the application is running in user space and the two cannot communicate directly. But in the actual application, when the equipment is ready, we want to notify the user program device is OK, the user program

The previous section has analyzed that the main thread listens for socket registration events and the callback function in the worker thread that connects the socket registration event is event_handler, and the core part of Event_handler is a finite

First, the problem introducedDuring work, a system designer throws the following question, the following code, outputs several "-"? ：/****************************************************************************** Copyright by Thomas Hu, all rights

This article mainly introduces the mutual exclusion and blocking knowledge under Linux :1. Atomic OperationAtomic manipulation refers to operations that are not interrupted by other code paths during execution.Examples of commonly used atomic

when multiple processes concurrently access the Operation same File , we can guarantee the correctness of the file data. Linux is typically used in a way that file Lock , to avoid a competing state of shared resources. file locks include Recommended

Linux Read/write Fread/fwrite The difference between the twoThe 1,fread is buffered and read without buffering.2,fopen is defined in standard C, and open is defined in POSIX.3,fread can read a structure. Read in Linux/unix There is no difference

Transferred from: http://blog.csdn.net/raptor/article/details/69218271ProblemIn a Python Web application, you need to perform some tasks on a regular basis, so use the Apscheduler library. Because it is used flask This web framework, so the use of