Unix网络编程-使用select执行TCP和UDP业务
作者：互联网
/**
* @file server-select-TCP-UDP.c
* 使用select同时处理TCP和UDP
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#define PORT 1226
int main(int argc, char **argv)
{
int listenSocket = socket(AF_INET, SOCK_STREAM, 0);
if (listenSocket < 0)
{
perror("socket");
exit(-1);
}
struct sockaddr_in serveraddr;
bzero(&serveraddr, 0);
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(PORT);
serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
const int on = 1; // 一个开关
setsockopt(listenSocket, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(listenSocket, (struct sockaddr*)&serveraddr, sizeof(serveraddr)) < 0)
{
perror("bind");
close(listenSocket);
exit(-1);
}
if (listen(listenSocket, 200) < 0)
{
perror("listen");
exit(-1);
}
int udpsocket = socket(AF_INET, SOCK_DGRAM, 0);
if (udpsocket < 0)
{
perror("socket");
exit(-1);
}
if (bind(udpsocket, (struct sockaddr*)&serveraddr, sizeof(serveraddr)) < 0)
{
perror("bind");
close(udpsocket);
close(listenSocket);
exit(-1);
}
fd_set allset;
FD_ZERO(&allset);
while (1)
{
FD_SET(listenSocket, &allset);
FD_SET(udpsocket, &allset);
int maxfd = max(listenSocket, udpsocket);
int readyNum;
if ((readyNum = select(maxfd + 1, &allset, NULL, NULL, NULL)) < 0)
{
if (errno == EINTR)
{
continue;
}
else
{
perror("select");
exit(-1);
}
}
if (FD_ISSET(listenSocket, &allset))
{
int clientSocket = accept(listenSocket, NULL, NULL);
int childpid = fork();
if (childpid < 0)
{
perror("fork");
exit(-1);
}
if (childpid == 0)
{
// tcp客户端业务
close(listenSocket);
}
else
{
close(clientSocket);
}
}
if (FD_ISSET(udpsocket, &allset))
{
// udp业务
}
}
}标签：unix网络编程 来源：