Input character头文件#include 函数原型int*fp);从文件流中读取下一个字节,并作为字符返回到达文件尾或出现错误时,返回EOFintgetc*fp);与fgetc()功能类似,但可实现成一个宏int getchar(void);相当于getc(stdin)Output character header file #include function prototype int fputc (int c, file *fp); writes a
Basic concepts of documentationFileObjects that can be read and writtenHave a certain right attribute, including access rights, types, etc.File systemA collection of files and their attributes, providing a naming and management mechanismFile
First, Socket basic knowledge 1. Socket functionSocket hierarchyThe socket essentially provides the endpoint of the process communication, before the process communicates, the two parties must first create an endpoint individually, otherwise there
Reprint please indicate source: http://blog.csdn.net/cywosp/article/details/300830151. Overview of the scenein the multi-threaded development, the mutex can be used to protect the critical resources and prevent inconsistent data, which is the most
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
This must be supported, and who told him to advertise that select is a standard.
#include #include #include #include #include #include
int main (int argc, char *argv[]){int LISTENFD, CONNFD;struct sockaddr_in serveraddr;Char buff[20];if ((LISTENFD
Original address: http://www.cnblogs.com/haippy/archive/2012/01/09/2317269.html
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Epoll Introduction
Epoll is an extensible IO event-handling mechanism in the Linux kernel that was first introduced in the Linux 2.5.44 kernel
Most file I/O in a Linux system uses only 5 functions: Open,read,write,lseek and close. The functions covered in this topic are called I/O with no buffering, and without buffering, read or read are implemented through a system call to the kernel,
EPOLL-I/O Event Notification Facility
In Linux network programming, it is a long time to use Select to do event triggering. In the new Linux kernel, there is a mechanism to replace it, which is epoll.
The biggest advantage over Select,epoll is
FAQ for Network programming Management collection
Summary of common problems in network programming
Some of the problems encountered in the network program are summarized, here is mainly for our commonly used TCP sockets related to the summary,
2015.1.22C Advanced Environment Construction:GCC compilers:Full name GUN CC, is a GNU tool chain, the source code compiled into machine code, the compilation of GCC depends on a lot of gadgets4.3.3 and 3.4. Version 3 are relatively stableGCC
Use the original DUP function of the system when implemented
MYDUP2.C//2015/08/17 Lucifer Zhang version1.0//write my own dup2 function//use DUP () function when inplemen tation #include //include DUP () #include #include #define OPEN_MAX 25
6/*
This article introduces the file I/0 in linux. for the kernel, all opened files are referenced by file descriptors. Each process has some associated file descriptors. The file descriptor is a non-negative integer. When you open an existing file or
Before Linux with a Python script to write a grab packet analysis gadget, really do not want to use what libpcap, Pypcap so, simple to a tcpdump plus grep to fix. The basic idea is to start tcpdump and grep two processes, the process directly
1, the UDP process 2 reminds: The client's sendto always succeeds, even if the service side does not run, also does not have the error, therefore has the second kind of flow. Server client socket (SOCK_DGRAM) Sockets
Records conflicts between php5.4 and php-redis. recently, due to the ubuntu update source, some lib conflicts between the original new source and the local system Library, leading to abnormal display on the system desktop, php5.4.9 is installed,
1. Mutual exclusion Lock (volume) and condition variableBy default, mutexes and condition variables are used for inter-thread synchronization, and can be used for inter-process synchronization if they are placed in a shared memory area.1.1 Mutual
Most file I/O requires only 5 functions: Open, read, write, Lseek, closeThis chapter describes the I/O without buffering (read write calls a system call in the kernel)File descriptorFor the kernel, all files are referenced by a file descriptor.The
12. function sync, Fsync and FdatasyncDeferred write: Traditional UNIX systems have buffers or page buffers in the kernel, most disk I/O are through buffers, and when we write data to a file, the kernel usually first copies the data to the buffer,
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