Unix Domain Socket IPc

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Socket Api 原本是为网络通讯设计的，但后来在socket 的框架上发展出一种IPC机制，他式可靠的通信，他只是将应用层数据从一个进程拷贝到另一个进程。

服务器代码：

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <c#type.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <string.h>

#define MAXLINE 80

int main(void)
{
    int unix_fd = Socket(AF_UNIX, SOCK_STREAM, 0);
    int connfd;
    int cliaddr_len;
    struct sockaddr_un server_addr, cliaddr;

    server_addr.sun_family = AF_UNIX;

    unlink("socket.file");
    strcpy(server_addr.sun_path, "socket.file");
    Bind(unix_fd, (struct sockaddr *)&server_addr, sizeof(server_addr));

    Listen(unix_fd, 20);

    printf("server start ..../n ");

    while (1)
    {
        cliaddr_len = sizeof(cliaddr);
        connfd = Accept(unix_fd, (struct sockaddr *)&cliaddr, &cliaddr_len);
        char buf[MAXLINE];
        int n = Read(connfd, buf, MAXLINE);

        printf("recerve the message: %s/n" , buf);

    }

    Close(connfd);
}

客户端代码：

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

#define MAXLINE 80

int main(void)
{
   int unix_fd = Socket(AF_UNIX, SOCK_STREAM, 0);
   int len;
   char buf[MAXLINE];
   struct sockaddr_un server_addr;
   int n;

   server_addr.sun_family = AF_UNIX;
   strcpy(server_addr.sun_path, "socket.file");

   len = offsetof(struct sockaddr_un, sun_path) + strlen("socket.file");

   //stycpy(server_addr.sun_path, "socket.file");
   //Bind(unix_fd, (struct sockaddr *)&servaddr, sizeof(servaddr));

   Connect(unix_fd, (struct sockaddr *)&server_addr, len);

   while (fgets(buf, MAXLINE, stdin) != NULL)
   {
       Write(unix_fd, buf, strlen(buf));
       n = Read(unix_fd, buf, MAXLINE);

       if (n == 0)
           printf("the other side has been closed: /n");

       else
           Write(STDOUT_FILENO, buf, n);

       //printf("buf: %s/n", buf);
   }

   Close(unix_fd);
}