tcp和udp多线程的epoll服务器+客户端源代码

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转载最新推荐文章于 2026-08-17 09:18:56 发布 5.9k 阅读 AI 写同款· GEO 优化 ›

【原创】性能炸裂c++20协程+iocp/epoll，C++20无栈协程超轻量高性能异步库开发实战主要讲述c++20协程库开发的实战过程和思路方法，比较干货，后面有源码。刚学也有很多不足，希望大佬指正。阅读详情

程序是从网上的一个epoll例子修改而来的

epoll tcp服务端 epoll_server.c:

/*
gcc -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I${ORACLE_HOME}/rdbms/public -I${ORACLE_HOME}/rdbms/demo -L${ORACLE_HOME}/lib -lclntsh -pthread -o epoll_server epoll_server.c
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
//#include
//#include
#include
#include
#include
#include

//#include "oci_api.h"

#define MAXBUF 1024
#define MAXEPOLLSIZE 10000

/*
setnonblocking - 设置句柄为非阻塞方式
*/
int setnonblocking(int sockfd)
{
    if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1) {
        return -1;
    }
    return 0;
}

/*
handle_message - 处理每个 socket 上的消息收发
*/
int handle_message(int new_fd)
{
    char buf[MAXBUF + 1];
    char sendbuf[MAXBUF+1];
    int len;
    /* 开始处理每个新连接上的数据收发 */
    bzero(buf, MAXBUF + 1);
    /* 接收客户端的消息 */
    len = recv(new_fd, buf, MAXBUF, 0);
    if (len > 0){

        printf
            ("%d接收消息成功:'%s'，共%d个字节的数据/n",
             new_fd, buf, len);
   /*

        char *s1="insert";
        char *s2="select";
        char *s3="delete";

    if(!strncmp(s1,buf,6))
        oci_insert(buf,sendbuf);
    else if(!strncmp(s2,buf,6))
        oci_select(buf,sendbuf);
    else if(!strncmp(s3,buf,6))
        oci_delete(buf,sendbuf);
    else
        sprintf(sendbuf,"input sql is error!/n");

        len=send(new_fd,sendbuf,strlen(sendbuf),0);
        if(len<0)
     printf("消息发送失败！错误代码是%d，错误信息是'%s'/n",

errno, strerror(errno));

*/
    }
    else {
        if (len < 0)
            printf
                ("消息接收失败！错误代码是%d，错误信息是'%s'/n",
                 errno, strerror(errno));
else
    printf
("客户端%d退出!/n",new_fd);
        //close(new_fd);
        return -1;
    }
    /* 处理每个新连接上的数据收发结束 */
    return len;
}
/************关于本文档********************************************
*filename: epoll-server.c
*purpose: 演示epoll处理海量socket连接的方法
*wrote by: zhoulifa(zhoulifa@163.com) 周立发(http://zhoulifa.bokee.com)
Linux爱好者 Linux知识传播者 SOHO族开发者最擅长C语言
*date time:2007-01-31 21:00
*Note: 任何人可以任意复制代码并运用这些文档，当然包括你的商业用途
* 但请遵循GPL
*Thanks to:Google
*Hope:希望越来越多的人贡献自己的力量，为科学技术发展出力
* 科技站在巨人的肩膀上进步更快！感谢有开源前辈的贡献！
*********************************************************************/
int main(int argc, char **argv)
{
    int listener, new_fd, nfds, n, ret;
    struct epoll_event ev;
    int kdpfd, curfds;
    socklen_t len;
    struct sockaddr_in my_addr, their_addr;
    unsigned int myport, lisnum;
    struct epoll_event events[MAXEPOLLSIZE];
    struct rlimit rt;

    if (argc>1)
        myport = atoi(argv[1]);
    else
        myport = 1234;

    if (argc>2)
        lisnum = atoi(argv[2]);
    else
        lisnum = 10;

    /* 设置每个进程允许打开的最大文件数 */
    rt.rlim_max = rt.rlim_cur = MAXEPOLLSIZE;
    if (setrlimit(RLIMIT_NOFILE, &rt) == -1) {
        perror("setrlimit");
        exit(1);
    }
    else printf("设置系统资源参数成功！/n");

    /* 开启 socket 监听 */
    if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(1);
    } else
        printf("socket 创建成功！/n");

    /*设置socket属性，端口可以重用*/
    int opt=SO_REUSEADDR;
    setsockopt(listener,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));

/*设置socket为非阻塞模式*/
setnonblocking(listener);

    bzero(&my_addr, sizeof(my_addr));
    my_addr.sin_family = PF_INET;
    my_addr.sin_port = htons(myport);
    if (argc>3)
        my_addr.sin_addr.s_addr = inet_addr(argv[3]);
    else
        my_addr.sin_addr.s_addr = INADDR_ANY;

    if (bind
        (listener, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))
        == -1) {
        perror("bind");
        exit(1);
    } else
        printf("IP 地址和端口绑定成功/n");

    if (listen(listener, lisnum) == -1) {
        perror("listen");
        exit(1);
    } else
        printf("开启服务成功！/n");

    /* 创建 epoll 句柄，把监听 socket 加入到 epoll 集合里 */
    kdpfd = epoll_create(MAXEPOLLSIZE);
    len = sizeof(struct sockaddr_in);
    ev.events = EPOLLIN | EPOLLET;
    ev.data.fd = listener;
    if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, listener, &ev) < 0) {
        fprintf(stderr, "epoll set insertion error: fd=%d/n", listener);
        return -1;
    } else
        printf("监听 socket 加入 epoll 成功！/n");
    curfds = 1;
    while (1) {
        /* 等待有事件发生 */
        nfds = epoll_wait(kdpfd, events, curfds, -1);
        if (nfds == -1) {
            perror("epoll_wait");
            break;
        }
        /* 处理所有事件 */
        for (n = 0; n < nfds; ++n) {
            if (events[n].data.fd == listener) {
                new_fd = accept(listener, (struct sockaddr *) &their_addr,
                                &len);
                if (new_fd < 0) {
                    perror("accept");
                    continue;
                } else
                    printf("有连接来自于： %s:%d，分配的 socket 为:%d/n", inet_ntoa(their_addr.sin_addr), ntohs(their_addr.sin_port), new_fd);

                setnonblocking(new_fd);
                ev.events = EPOLLIN | EPOLLET;
                ev.data.fd = new_fd;
                if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, new_fd, &ev) < 0) {
                    fprintf(stderr, "把 socket '%d' 加入 epoll 失败！%s/n",
                            new_fd, strerror(errno));
                    return -1;
                }
                curfds++;
            } else {
                ret = handle_message(events[n].data.fd);
                if (ret < 1 && errno != 11) {
                    if(epoll_ctl(kdpfd, EPOLL_CTL_DEL, events[n].data.fd,
                              &ev) < 0)
             {
             fprintf(stderr, "把 socket '%d' 从 epoll 删除失败！%s/n",
                     events[n].data.fd, strerror(errno));
             }
                    curfds--;
      close(events[n].data.fd);
                }
            }
        }
    }
    close(listener);
    return 0;
}

tcp客户端client.c:

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#define MAXLINE 1024
char sendhead[MAXLINE];

int main(int argc , char* argv[])

{
int sockfd;

struct sockaddr_in servaddr;

char *info="cxt";
int maxfdp1, stdineof;
fd_set rset;
char recvbuf[MAXLINE],tmp[128],sendbuf[MAXLINE];
int n,len,fd;

if(argc!=3){
printf("useage:client address port ");
exit(0);
}

if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1 )

{
perror("socket");
exit(1);
}
   printf("%s connect server/n",info);
   bzero(&servaddr,sizeof(servaddr));
   servaddr.sin_family=AF_INET;
   servaddr.sin_port=htons(atoi(argv[2]));
   inet_pton(AF_INET,argv[1],&servaddr.sin_addr);
   if( ( connect(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr)) )<0)
   {
     perror("connect");
     exit(1);
   }
send(sockfd,info,strlen(info),0);
//FD_ZERO(&rset);
//FD_SET(sockfd, &rset);
        //FD_SET(0, &rset);
//maxfdp1=sockfd+1;
for ( ; ; ) {
FD_ZERO(&rset);
FD_SET(sockfd, &rset);
         FD_SET(0, &rset);
maxfdp1=sockfd+1;

if( ( select(maxfdp1, &rset, NULL, NULL, NULL) )<=0){
      perror("select");
}else{
if (FD_ISSET(0,&rset)){
                        fgets(sendbuf, MAXLINE, stdin);
                        n=send(sockfd,sendbuf,strlen(sendbuf)-1,0);
                        if(n>0)
                                printf("send: %s",sendbuf);
                        else
                                printf("send: %s error,the erro cause is %s:%s/n",sendbuf,errno,strerror(errno));
   bzero(sendbuf,strlen(sendbuf));

}

if (FD_ISSET(sockfd, &rset)) { /* socket is readable */
   n=recv(sockfd, recvbuf, MAXLINE,0) ;
                      if(n<0) {
    perror("str_cli: server terminated prematurely");
   }else if(n==0)
    {
    printf("sever shutdown!");
    exit(-1);
    }
   //recvbuf
   recvbuf[n]='/0';
   printf("receive :%s/n",recvbuf);
   fflush(stdout);
   bzero(recvbuf,strlen(recvbuf));
}
}
}

exit(0);
}

udp +epoll+多线程服务器 udp_epoll_server.c:

/*
gcc -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I${ORACLE_HOME}/rdbms/public -I${ORACLE_HOME}/rdbms/demo -L${ORACLE_HOME}/lib -lclntsh -pthread -o udp_epoll_server udp_epoll_server.c -lpthread
*/

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
//#include
//#include
#include
#include
#include
#include
#include
#include

//#include "oci_api.h"

#define MAXBUF 1024
#define MAXEPOLLSIZE 100

/*
   setnonblocking – 设置句柄为非阻塞方式
   */
int setnonblocking(int sockfd)
{
    if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1)
    {
        return -1;
    }
    return 0;
}

/*
   pthread_handle_message – 线程处理 socket 上的消息收发
   */
void* pthread_handle_message(int* sock_fd)
{
    char recvbuf[MAXBUF + 1];
    char sendbuf[MAXBUF+1];
    int ret;
    int new_fd;
    struct sockaddr_in client_addr;
    socklen_t cli_len=sizeof(client_addr);

    new_fd=*sock_fd;
    /* 开始处理每个新连接上的数据收发 */
    bzero(recvbuf, MAXBUF + 1);
    bzero(sendbuf, MAXBUF + 1);
    /* 接收客户端的消息 */
    ret = recvfrom(new_fd, recvbuf, MAXBUF, 0, (struct sockaddr *)&client_addr, &cli_len);
    if (ret > 0)
    {
        printf("socket %d 接收到来自:%s:%d的消息成功:’%s’，共%d个字节的数据/n",
             new_fd, inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port), recvbuf, ret);
/* char *s1="insert";
    char *s2="select";
    char *s3="delete";

    if(!strncmp(s1,recvbuf,6))
        oci_insert(recvbuf,sendbuf);
    else if(!strncmp(s2,recvbuf,6))
        oci_select(recvbuf,sendbuf);
    else if(!strncmp(s3,recvbuf,6))
        oci_delete(recvbuf,sendbuf);
    else
        sprintf(sendbuf,"input sql is error!/n");

ret = sendto(new_fd, sendbuf, strlen(sendbuf), 0, (struct sockaddr *)&client_addr, cli_len);
        if(ret<0)
            printf("消息发送失败！错误代码是%d，错误信息是'%s'/n",
                            errno, strerror(errno));
   */

    }
    else
    {
            printf("消息接收失败！错误代码是%d，错误信息是’%s’/n",
                 errno, strerror(errno));
    }
    /* 处理每个新连接上的数据收发结束 */
    //printf("pthread exit!");
    fflush(stdout);
    pthread_exit(NULL);
}

int main(int argc, char **argv)
{
    int listener, kdpfd, nfds, n, curfds;
    socklen_t len;
    struct sockaddr_in my_addr, their_addr;
    unsigned int myport;
    struct epoll_event ev;
    struct epoll_event events[MAXEPOLLSIZE];
    struct rlimit rt;

myport = 1234;

pthread_t thread;
pthread_attr_t attr;

    /* 设置每个进程允许打开的最大文件数 */
    rt.rlim_max = rt.rlim_cur = MAXEPOLLSIZE;
    if (setrlimit(RLIMIT_NOFILE, &rt) == -1)
    {
        perror("setrlimit");
        exit(1);
    }
    else
    {
        printf("设置系统资源参数成功！/n");
    }
    /* 开启 socket 监听 */
    if ((listener = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
    {
        perror("socket 创建失败！");
        exit(1);
    }
    else
    {
        printf("socket 创建成功！/n");
    }

    /*设置socket属性，端口可以重用*/
    int opt=SO_REUSEADDR;
    setsockopt(listener,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));

    setnonblocking(listener);
    bzero(&my_addr, sizeof(my_addr));
    my_addr.sin_family = PF_INET;
    my_addr.sin_port = htons(myport);
    my_addr.sin_addr.s_addr = INADDR_ANY;
    if (bind(listener, (struct sockaddr *) &my_addr, sizeof(struct sockaddr)) == -1)
    {
        perror("bind");
        exit(1);
    }
    else
    {
        printf("IP 地址和端口绑定成功/n");
    }

    /* 创建 epoll 句柄，把监听 socket 加入到 epoll 集合里 */
    kdpfd = epoll_create(MAXEPOLLSIZE);
    len = sizeof(struct sockaddr_in);
    ev.events = EPOLLIN | EPOLLET;
    ev.data.fd = listener;
    if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, listener, &ev) < 0)
    {
        fprintf(stderr, "epoll set insertion error: fd=%d/n", listener);
        return -1;
    }
    else
    {
        printf("监听 socket 加入 epoll 成功！/n");
    }
    while (1)
    {
        /* 等待有事件发生 */
        nfds = epoll_wait(kdpfd, events, 10000, -1);
        if (nfds == -1)
        {
            perror("epoll_wait");
            break;
        }
        /* 处理所有事件 */
        for (n = 0; n < nfds; ++n)
        {
            if (events[n].data.fd == listener)
            {
                /*初始化属性值，均设为默认值*/
                pthread_attr_init(&attr);
                pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
                /* 设置线程为分离属性*/
                pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

                if(pthread_create(&thread,&attr,(void*)pthread_handle_message,(void*)&(events[n].data.fd)))
                {
                        perror("pthread_creat error!");
                        exit(-1);
                }
            }
        }
    }
    close(listener);
    return 0;
}

udp客户端 udp_client.c:

#include
#include
#include
#include
#include
#include
#include
#include

#define MAXLINE 1024
#define SERV_PORT 1234

void do_cli(FILE *fp, int sockfd, struct sockaddr *pservaddr, socklen_t servlen)
{
int n;
char sendline[MAXLINE], recvline[MAXLINE + 1];

/* connect to server */
if(connect(sockfd, (struct sockaddr *)pservaddr, servlen) == -1)
{
perror("connect error");
exit(1);
}

while(fgets(sendline, MAXLINE, fp) != NULL)
{
/* read a line and send to server */
write(sockfd, sendline, strlen(sendline)-1);
/* receive data from server */
n = read(sockfd, recvline, MAXLINE);
if(n == -1)
{
perror("read error");
exit(1);
}
recvline[n] = '/0'; /* terminate string */
//fputs(recvline, stdout);
printf("receive:%s/n",recvline);
fflush(stdout);

}
}

int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;

/* check args */
if(argc != 2)
{
printf("usage: udpclient /n");
exit(1);
}

/* init servaddr */
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(SERV_PORT);
if(inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0)
{
printf("[%s] is not a valid IPaddress/n", argv[1]);
exit(1);
}

sockfd = socket(AF_INET, SOCK_DGRAM, 0);

do_cli(stdin, sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));

return 0;
}

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