socket网络编程-----I/O复用之select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/select.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));
    }

    fd_set rdfds;
    struct timeval timeout;
    timeout.tv_sec = ;
    timeout.tv_usec = ;
    while()
    {
        FD_ZERO(&rdfds);
        FD_SET(,&rdfds);
        FD_SET(acceptfd,&rdfds);
        ret = select(acceptfd+,&rdfds,NULL,NULL,&timeout);
        if(ret < )
        {
            printf("polling Monitor failed!\n");
            continue;
        }
        if(FD_ISSET(,&rdfds))
        {
            ret = rw_opt(,acceptfd);
            if(ret == )
                break;
        }
        if(FD_ISSET(acceptfd,&rdfds))
        {
            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/select.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 ;
    }
    fd_set rdfds;
    struct timeval timeout;
    timeout.tv_sec = ;
    timeout.tv_usec = ;

    while()
    {
        FD_ZERO(&rdfds);
        FD_SET(,&rdfds);
        FD_SET(sockfd,&rdfds);
        ret = select(sockfd+,&rdfds,NULL,NULL,&timeout);
        if(ret < )
        {
            printf("polling Monitor failed!\n");
            continue;
        }
        if(FD_ISSET(,&rdfds))
        {
            ret = rw_opt(,sockfd);
            if(ret == )
                break;
        }
        if(FD_ISSET(sockfd,&rdfds))
        {
            ret = rw_opt(sockfd,);
            if(ret == )
                break;
        }

    }
    close(sockfd);
    return ;
}

cli.c