socket网络编程-----I/O复用之poll函数

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/time.h>

#define BUFSIZE 255

int rw_opt(int rdfd,int wdfd)
{
    int num;
    char buf[BUFSIZE];
    memset(buf,,sizeof(buf));
    num = read(rdfd,buf,sizeof(buf));
    if(wdfd == )
        write(,">>>",);
    write(wdfd,buf,num);
    if(strncmp(buf,"quit",) == )
        return ;
    return num;
}

int main()
{
    int sockfd,ret;
    int acceptfd;
    struct sockaddr_in s_addr;
    sockfd = socket(AF_INET,SOCK_STREAM,);
    if(sockfd == -)
    {
        printf("socket error!\n");
        return ;
    }

    memset(&s_addr,,sizeof(struct sockaddr_in));
    s_addr.sin_family = AF_INET;
    s_addr.sin_port = htons();
    s_addr.sin_addr.s_addr = htons(INADDR_ANY);
    ret = bind(sockfd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));
    if(ret == -)
    {
        printf("bind error!\n");
        return ;
    }

    ret = listen(sockfd,);
    if(ret == -)
    {
        printf("listen error!\n");
        return ;
    }

    int addrlen = sizeof(struct sockaddr);
    acceptfd = accept(sockfd,(struct sockaddr *)&s_addr,&addrlen);
    if(acceptfd == -)
    {
        printf("accept error!\n");
    }
    else
    {
        printf("%s-----%d\n",inet_ntoa(s_addr.sin_addr),ntohs(s_addr.sin_port));
    }

    struct pollfd fds[];
    fds[].fd=;
    fds[].fd=acceptfd;
    fds[].events=POLLIN|POLLOUT;
    fds[].events=POLLIN|POLLOUT;
    while()
    {
        ret=poll(fds, , -);
        if(ret<)
        {
            perror("poll");
            continue;
        }
        if(fds[].revents&POLLIN)
        {
            ret=rw_opt(, acceptfd);
            if(ret == )
                break;
        }
        if(fds[].revents&POLLIN)
        {
            ret=rw_opt(acceptfd, );
            if(ret == )
                break;
        }
    }
    close(acceptfd);
    close(sockfd);
    return ;
}

ser.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/time.h>

#define BUFSIZE 255

int rw_opt(int rdfd,int wdfd)
{
    int num;
    char buf[BUFSIZE];
    memset(buf,,sizeof(buf));
    num = read(rdfd,buf,sizeof(buf));
    if(wdfd == )
        write(,">>>",);
    write(wdfd,buf,num);
    if(strncmp(buf,"quit",) == )
        return ;
    return num;
}

int main(int argc,char **argv)
{
    int sockfd,ret;
    int acceptfd;
    struct sockaddr_in s_addr;
    sockfd = socket(AF_INET,SOCK_STREAM,);
    if(sockfd == -)
    {
        printf("socket error!\n");
        return ;
    }

    memset(&s_addr,,sizeof(struct sockaddr_in));
    s_addr.sin_family = AF_INET;
    s_addr.sin_port = htons();
    s_addr.sin_addr.s_addr = inet_addr(argv[]);
    ret = connect(sockfd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));
    if(ret == -)
    {
        printf("connect error!\n");
        return ;
    }

    struct pollfd fds[];
    fds[].fd=;
    fds[].fd=sockfd;
    fds[].events=POLLIN|POLLOUT;
    fds[].events=POLLIN|POLLOUT;

    while()
    {
        ret=poll(fds, , -);
        if(ret<)
        {
            perror("poll");
            continue;
        }
        if(fds[].revents&POLLIN)
        {
            ret=rw_opt(,sockfd);
            if(ret == )
                break;
        }
        if(fds[].revents&POLLIN)
        {
            ret=rw_opt(sockfd, );
            if(ret == )
                break;
        }
    }
    close(sockfd);
    return ;
}

cli.c