本地socket--SOCK_DGRAM方式

服务端

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>

#define PATH "./tt"

int main(int argc ,char *argv[])
{
    int sockfd = 0;
    struct sockaddr_un addr;
    unlink(PATH);  
    addr.sun_family = AF_UNIX;
    strcpy(addr.sun_path,PATH);

    unsigned int len = strlen(addr.sun_path) + sizeof(addr.sun_family);
    sockfd = socket(AF_UNIX,SOCK_DGRAM,0);
    if(sockfd < 0 )
    {
        perror("socket error");
        exit(-1);
    }

    if(bind(sockfd,(struct sockaddr *)&addr,len) < 0)
    {
        perror("bind error");
        close(sockfd);
        exit(-1);
    }
    printf("Bind is ok\n");

    while(1)
    {
        char recv_buf[20] = "";
        recvfrom(sockfd,recv_buf,sizeof(recv_buf),0,(struct sockaddr*)&addr,&len);
        printf("Recv: %s\n",recv_buf);
    }
    return 0;

}

客户端：

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>

#define PATH "./tt"

int main(int argc,char *argv[])
{
    int sockfd = 0;
    struct sockaddr_un addr;
    bzero(&addr,sizeof(addr));

    addr.sun_family = AF_UNIX;
    strcpy(addr.sun_path,PATH);

    sockfd = socket(AF_UNIX,SOCK_DGRAM,0);
    if(sockfd < 0)
    {
        perror("socket error");
        exit(-1);
    }

    while(1)
    {
        static int counter = 0;
        char send_buf[20] = "";
        counter++;
        sprintf(send_buf,"Counter is %d",counter);
        int len = strlen(addr.sun_path)+sizeof(addr.sun_family);
        sendto(sockfd,send_buf,strlen(send_buf),0,(struct sockaddr*)&addr,len);
        printf("Send: %s\n",send_buf);
        sleep(1);
    }
    return 0;
}