网络io与io多路复用select/poll/epoll

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一、网络io多路复用代码实现

#include <sys/socket.h>
#include <errno.h>
#include <netinet/in.h>

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include <pthread.h>
#include <sys/poll.h>
#include <sys/epoll.h>


// block
void *client_thread(void *arg) {
   
   

	int clientfd = *(int *)arg;

	while (1) {
   
   

		char buffer[128] = {
   
   0};
		int count = recv(clientfd, buffer, 128, 0);
		if (count == 0) {
   
   
			break;
		}
		
		//
		
		send(clientfd, buffer, count, 0);
		printf("clientfd: %d, count: %d, buffer: %s\n", clientfd, count, buffer);

	}

	close(clientfd);
}


// tcp 
int main() {
   
   

	int sockfd = socket(AF_INET, SOCK_STREAM, 0);	// 创建一个socket

	struct sockaddr_in serveraddr;
	memset(&serveraddr, 0, sizeof(struct sockaddr_in));

	serveraddr.sin_family = AF_INET;
	serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
	serveraddr.sin_port = htons(2048);

	if (-1 == bind(sockfd, (struct sockaddr*)&serveraddr, sizeof(struct sockaddr))) {
   
   
		perror("bind");
		return -1;
	}

	listen(sockfd, 10);

#if 0
	struct sockaddr_in clientaddr;
	socklen_t len