Example: Client application that uses AF_UNIX_CCSID address family

/**************************************************************************/
/* This sample program provides code for a client application for         */
/* AF_UNIX_CCSID address family.                                          */
/**************************************************************************/

/**************************************************************************/
/* Header files needed for this sample program                            */
/**************************************************************************/
#include <stdio.h>
#include <string.h>
#include <wcstr.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/unc.h>

/**************************************************************************/
/* Constants used by this program                                         */
/**************************************************************************/
#define SERVER_PATH     "/tmp/server"
#define BUFFER_LENGTH    250
#define FALSE              0

/* Pass in 1 parameter which is either the */
/* path name of the server as a UNICODE    */
/* string, or set the server path in the   */
/* #define SERVER_PATH which is a CCSID    */
/* 500 string.                             */
void main(int argc, char *argv[])
{
   /***********************************************************************/
   /* Variable and structure definitions.                                 */
   /***********************************************************************/
   int    sd=-1, rc, bytesReceived;
   char   buffer[BUFFER_LENGTH];
   struct sockaddr_unc serveraddr;

   /***********************************************************************/
   /* A do/while(FALSE) loop is used to make error cleanup easier.  The   */
   /* close() of the socket descriptor is only done once at the very end  */
   /* of the program.                                                     */
   /***********************************************************************/
   do
   {
      /********************************************************************/
      /* The socket() function returns a socket descriptor representing   */
      /* an endpoint.  The statement also identifies that the UNIX_CCSID  */
      /* address family with the stream transport (SOCK_STREAM) will be   */
      /* used for this socket.                                            */
      /********************************************************************/
      sd = socket(AF_UNIX_CCSID, SOCK_STREAM, 0);
      if (sd < 0)
      {
         perror("socket() failed");
         break;
      }

      /********************************************************************/
      /* If an argument was passed in, use this as the server, otherwise  */
      /* use the #define that is located at the top of this program.      */
      /********************************************************************/
      memset(&serveraddr, 0, sizeof(serveraddr));
      serveraddr.sunc_family = AF_UNIX_CCSID;
      if (argc > 1)
      {
         /* The argument is a UNICODE path name.  Use the default format  */
         serveraddr.sunc_format = SO_UNC_DEFAULT;
         wcscpy(serveraddr.sunc_path.wide, (wchar_t *) argv[1]);
      }
      else
      {
         /* The local #define is CCSID 500.  Set the Qlg_Path_Name to use */
         /* the character format                                          */
         serveraddr.sunc_format          = SO_UNC_USE_QLG;
         serveraddr.sunc_qlg.CCSID       = 500;
         serveraddr.sunc_qlg.Path_Type   = QLG_CHAR_SINGLE;
         serveraddr.sunc_qlg.Path_Length = strlen(SERVER_PATH);
         strcpy((char *)&serveraddr.sunc_path, SERVER_PATH);
      }
      /********************************************************************/
      /* Use the connect() function to establish a connection to the      */
      /* server.                                                          */
      /********************************************************************/
      rc = connect(sd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
      if (rc < 0)
      {
         perror("connect() failed");
         break;
      }

      /********************************************************************/
      /* Send 250 bytes of a's to the server                              */
      /********************************************************************/
      memset(buffer, 'a', sizeof(buffer));
      rc = send(sd, buffer, sizeof(buffer), 0);
      if (rc < 0)
      {
         perror("send() failed");
         break;
      }

      /********************************************************************/
      /* In this example we know that the server is going to respond with */
      /* the same 250 bytes that we just sent.  Since we know that 250    */
      /* bytes are going to be sent back to us, we can use the          */
      /* SO_RCVLOWAT socket option and then issue a single recv() and     */
      /* retrieve all of the data.                                        */
      /*                                                                  */
      /* The use of SO_RCVLOWAT is already illustrated in the server      */
      /* side of this example, so we will do something different here.    */
      /* The 250 bytes of the data may arrive in separate packets,        */
      /* therefore we will issue recv() over and over again until all     */
      /* 250 bytes have arrived.                                          */
      /********************************************************************/
      bytesReceived = 0;
      while (bytesReceived < BUFFER_LENGTH)
      {
         rc = recv(sd, & buffer[bytesReceived],
                   BUFFER_LENGTH - bytesReceived, 0);
         if (rc < 0)
         {
            perror("recv() failed");
            break;
         }
         else if (rc == 0)
         {
            printf("The server closed the connection\n");
            break;
         }

         /*****************************************************************/
         /* Increment the number of bytes that have been received so far  */
         /*****************************************************************/
         bytesReceived += rc;
      }

   } while (FALSE);

   /***********************************************************************/
   /* Close down any open socket descriptors                              */
   /***********************************************************************/
   if (sd != -1)
      close(sd);
}