UNIX环境高级编程——TCP/IP网络编程

//server.c

#include <stdio.h>  
#include <unistd.h>  
#include <stdlib.h>  
#include <sys/types.h>  
#include <sys/socket.h>  
#include <errno.h>  
#include <strings.h>  
#include <sys/un.h>  
      
typedef struct sockaddr SA;  
#define N 64  
      
      
int main(int argc, char *argv[])  
{  
    int listenfd, connfd;  
    struct sockaddr_un myaddr, peeraddr;  
    socklen_t len;  
    char buf[N] = {0};  
    ssize_t n;  
      
      
    if ((listenfd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)  
    {  
        perror("socket");  
        exit(-1);  
    }  
          
    bzero(&myaddr, sizeof(myaddr));  
    myaddr.sun_family = PF_UNIX;  
    strcpy(myaddr.sun_path, "serversocket");  
      
    unlink("serversocket");  
    if (bind (listenfd, (SA *)&myaddr, sizeof(myaddr)) == -1)  
    {  
        perror("bind");  
        exit(-1);  
    }  
      
    if (listen(listenfd, 5) == -1)  
    {  
        perror("listen");  
        exit(-1);  
    }  
      
    bzero(&peeraddr, sizeof(peeraddr));  
    len = sizeof(peeraddr);  
      
    while (1)  
    {  
        if ((connfd = accept(listenfd, (SA *)&peeraddr, &len)) == -1)  
        {  
            perror("accept");  
            exit(-1);  
        }  
        printf("welcome %sn", peeraddr.sun_path);  
      
        while (1)  
        {  
            bzero(buf, sizeof(buf));  
            if ((n = recv(connfd, buf, N, 0)) == 0)  
                break;  
            send(connfd, buf, N, 0);  
        }  
      
        close(connfd);  
    }  
      
      
    exit(0);  
}

//client.c

#include <stdio.h>  
#include <unistd.h>  
#include <string.h>  
#include <stdlib.h>  
#include <sys/types.h>  
#include <sys/socket.h>  
#include <errno.h>  
#include <strings.h>  
#include <sys/un.h>  
      
typedef struct sockaddr SA;  
#define N 64  
      
int main(int argc, char *argv[])  
{  
    int sockfd;  
    ssize_t n;  
    struct sockaddr_un servaddr,myaddr;  
    char buf[N] = {0};  
      
    if ((sockfd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)  
    {  
        perror("socket");  
        exit(-1);  
    }  
      
#if 1  
    bzero(&myaddr, sizeof(myaddr));  
    myaddr.sun_family = PF_UNIX;  
    strcpy(myaddr.sun_path, "clientsocket");  
      
    unlink("clientsocket");  
    if (bind (sockfd, (SA *)&myaddr, sizeof(myaddr)) == -1)  
    {  
        perror("bind");  
        exit(-1);  
    }  
#endif  
          
    bzero(&servaddr, sizeof(servaddr));  
    servaddr.sun_family = PF_UNIX;  
    strcpy(servaddr.sun_path, "serversocket");  
      
    if (connect(sockfd, (SA *)&servaddr, sizeof(servaddr)) == -1)  
    {  
        perror("connect");  
        exit(-1);  
    }  
      
    printf(">");  
    while (fgets(buf, N, stdin) != NULL)//abcn   
    {  
        buf[strlen(buf)-1] = 0;//abc
        send(sockfd, buf, N, 0);  
      
        bzero(buf, sizeof(buf));  
        n = recv(sockfd, buf, N, 0);  
        printf("n=%d buf=%sn", n, buf);  
        printf(">");  
    }  
      
    close(sockfd);  
      
    exit(0);  
}

UNIX域（用户数据报）套接字

//client.c

#include <stdio.h>  
#include <unistd.h>  
#include <stdlib.h>  
#include <sys/types.h>  
#include <sys/socket.h>  
#include <errno.h>  
#include <strings.h>  
#include <string.h>  
#include <sys/un.h>  
      
typedef struct sockaddr SA;  
#define N 64  
      
int main(int argc, char *argv[])  
{  
    int sockfd;  
    struct sockaddr_un servaddr, myaddr;  
    socklen_t len;  
    char buf[N] = {0};  
      
    if ((sockfd = socket(PF_UNIX, SOCK_DGRAM, 0)) == -1)  
    {  
        perror("socket");  
        exit(-1);  
    }  
          
    bzero(&myaddr, sizeof(myaddr));  
    myaddr.sun_family = PF_UNIX;  
    strcpy(myaddr.sun_path, "clientsocket");  
      
    unlink("clientsocket");  
    if (bind (sockfd, (SA *)&myaddr, sizeof(myaddr)) == -1)  
    {  
        perror("bind");  
        exit(-1);  
    }  
      
    bzero(&servaddr, sizeof(servaddr));  
    servaddr.sun_family = PF_UNIX;  
    strcpy(servaddr.sun_path, "serversocket");  
      
    printf(">");  
    while (fgets(buf, N, stdin) != NULL)  
    {  
        buf[strlen(buf)-1] = 0;  
        sendto(sockfd, buf, N, 0, (SA *)&servaddr, sizeof(servaddr));  
        bzero(buf, sizeof(buf));  
        recvfrom(sockfd, buf, N, 0, NULL, NULL);  
        printf("%sn", buf);  
        printf(">");  
    }  
      
    close(sockfd);  
      
    exit(0);  
}

//server.c

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