u014211079的专栏

Raw sockets提供3个特性，这些是TCP和UDP都不提供的：

What we need is the capability to tell the kernel that we want to be notified if one or more I/O conditions are ready (i.e., input is ready to be read, or the descriptor is capable oftaking more out

Socket Timeouts三种方法设置timeout

The Unix domain protocols are not an actual protocol suite, but a way of performing client/server communication on a single host using the same API that is used for clients and servers on different ho

A common use of ioctl by network programs (typically servers) is to obtain information onall the host's interfaces when the program starts: the interface addresses, whether theinterface supports

#include ssize_t recvfrom(int sockfd, void *buff, size_t nbytes, int flags, struct sockaddr *from, socklen_t *addrlen);ssize_t sendto(int sockfd, const void *buff, size_t nbytes, int flags, const

create a semaphore directly, then set it up with sema_init:void sema_init(struct semaphore *sem, int val);

Socket TimeoutsThere are three ways to place a timeout on an I/O operation involving a socket:

By default, sockets are blocking.

We will also develop a simple TCPclient using the Transport Provider Interface (TPI), the interface into the transport layerthat sockets normally use on a system based on STREAMS

位置：net/socket.c首先，和目录，一般文件一样，socket也是一种文件类型，对它的处理通过VFS系统来进行，先来看初始化：core_initcall(sock_init); /* early initcall */#define core_initcall(fn) __define_initcall(fn, 1)#define __define_initcall(f

Signal-Driven I/O for Sockets三个步骤：

在传输层，当连接的一端有很重要的情况发生时，wf

有多种方法设置和得到socket

STREAMS是一个framework，使用TPI（Transport Provider Interface，）

可以看到本地链kht

#include struct sigaction