UNIX域用户数据报套接字一例

服务器端：

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/un.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

typedef struct sockaddr SA;

#define N 256

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

    int listenfd;
    struct sockaddr_un myaddr, peeraddr;
    socklen_t peerlen = sizeof(peeraddr);
    char buffer[N];

    if(argc < 2)
    {
        printf("usage:%s <sock file>\n",argv[0]);
        exit(-1);
    }

    if((listenfd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0)
    {
        perror("fail to socket");
        exit(-1);
    }

    bzero(&myaddr, sizeof(struct sockaddr_un));

    myaddr.sun_family = PF_UNIX;
    strcpy(myaddr.sun_path, argv[1]);

    remove(argv[1]);
    if(bind(listenfd, (SA *)&myaddr, sizeof(myaddr)) < 0)
    {
        perror("fail to bind");
        exit(-1);
    }

    bzero(&peeraddr, peerlen);

    while(1)
    {
        recvfrom(listenfd, buffer, N, 0, (SA *)&peeraddr, &peerlen);

        printf("receive from client [%s]> %s",peeraddr.sun_path, buffer);
        sendto(listenfd, buffer, N, 0, (SA *)&peeraddr, sizeof(peeraddr));
    }

    return 0;
}

客户端：

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

typedef struct sockaddr SA;

#define N 256

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

    int sockfd;
    struct sockaddr_un myaddr,serveraddr;
    char buffer[N];

    if(argc < 3)
    {
        printf("usage:%s <server sock> <client sock>\\n",argv[0]);
        exit(-1);
    }

    if((sockfd = socket(PF_UNIX, SOCK_DGRAM, 0)) < 0)
    {
        perror("fail to socket");
        exit(-1);
    }

    bzero(&myaddr, sizeof(struct sockaddr_un));

    myaddr.sun_family = PF_UNIX;
    strcpy(myaddr.sun_path, argv[2]);

    unlink(argv[2]);
    if(bind(sockfd, (SA *)&myaddr, sizeof(myaddr)) < 0)
    {
        perror("fail to bind");
        exit(-1);
    }


    bzero(&serveraddr, sizeof(struct sockaddr_un));

    serveraddr.sun_family = PF_UNIX;
    strcpy(serveraddr.sun_path, argv[1]);

    while(1)
    {

        fgets(buffer, N ,stdin);
        if(strncmp(buffer, "quit", 4) == 0)
        {
            break;
        }

        sendto(sockfd, buffer, N, 0, (SA *)&serveraddr, sizeof(serveraddr));
        bzero(buffer, N);
        recvfrom(sockfd, buffer, N, 0, NULL, NULL);

        printf("receive from server: %s", buffer);
    }

        close(sockfd);
    return 0;
}

运行：

服务器：

客户端：