unix域格式的協議族的簡單socket編程

所需要的標頭檔：
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/select.h>

用戶端：
#define SOCK_PATH  "foo.sock"
int main(int argc, char **argv)
{
  int client_fd;
  int len;
  ssize_t  I;
  char *msg = "hello server";
  char buf[1024] = {0};
  struct sockaddr_un remote;
  if((client_fd = socket(AF_LOCAL, SOCK_STREAM, 0)) == -1)
  {
    perror("socket()");
    exit(0);
  }
  remote.sun_family = AF_LOCAL;
  strcpy(remote.sun_path, SOCK_PATH);
  len = sizeof(remote);
  if(connect(client_fd, (struct sockaddr *)&remote, len) == -1)
  {
    strerror(errno);
    exit(0);
  }
  if(send(client_fd, msg, strlen(msg), 0) == -1)
  {
    strerror(errno);
    exit(0);
  }
  if(recv(client_fd, buf, sizeof(buf), 0) == -1)
  {
    perror("recv:");
    exit(0);
  }
  printf("%s/n", buf);
}

伺服器端：
int main(int argc, char **argv)
{
  struct sockaddr_un address;
  int sock, conn;
  int addrLength;

  ssize_t I;
  char buf[1024] = {0};
  char *msg = "I has recived";
  if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
  {
    perror("socket");
    exit(0);
  }
  unlink("foo.sock");
  address.sun_family = AF_UNIX;
  strcpy(address.sun_path, "foo.sock");    //foo.sock——會自動建立一個以其為名稱的socket檔案，在目前的目錄下。
  addrLength = sizeof(address.sun_family) + strlen(address.sun_path);
  if(bind(sock, (struct sockaddr *) &address, addrLength))
    perror("bind");
  if(listen(sock, 5))
    perror("listen");
  conn = accept(sock, (struct sockaddr *) &address, &addrLength);

  while(1)

  {

     if((I = recv(conn, buf, sizeof(buf), 0)) == -1)

     {

         if(errno == EINTR)

           continue;

         else

         {

            perror("recv");

            exit(0);

         }

     if(I == 0)

       break;

 }

 
printf("%s/n", buf);
  send(conn, msg, strlen(msg), 0);
  }
  return 0;
}