TCP client/server problem.

Hi all,
I am using Sun Solaris and GCC. In using AF_UNIX socket, I have established a conversation by executing "listen()", "accept()", and "read()" to wait for message from client. When the client try to send more than one message within the same conversation eg calling three "write()", the "read()" doesn't hold there waiting for data but returning 0 every time it is executed. I would like to ask is this how tcp designed to be or I have done something wrong?

the following is the exact code for server and client.

Thanks and regards,

~~~~~~~~~~~Server~~~~~~~~~~~~~~~
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>

#define NAME "socket"

main()
{
int sock, msgsock, rval;
struct sockaddr_un server;
char buf[1024];
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
perror("opening stream socket");
exit(1);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, NAME);
if (bind(sock, &server, sizeof(struct sockaddr_un))) {
perror("binding stream socket");
exit(1);
}
printf("Socket has name %s\n", server.sun_path);
listen(sock, 5);
msgsock = accept(sock, 0, 0);
for (;;) {
if (msgsock == -1)
perror("accept");
else do {
bzero(buf, sizeof(buf));
if ((rval = read(msgsock, buf, 1024)) < 0)
perror("reading stream message");
else if (rval == 0)
printf("Ending connection\n");
else
printf("-->%s\n", buf);
} while (rval > 0);
}
close(msgsock);
close(sock);
unlink(NAME);
}

~~~~~~~~~~~~Client~~~~~~~~~
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>

#define DATA "Half a league, half a league . . ."

main(argc, argv)
int argc;
char *argv[];
{
int sock;
struct sockaddr_un server;
char buf[1024];
if( argc != 2 )
{
printf("Usage: unix_client <socket Name>\n");
exit(-1);
}
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
perror("opening stream socket");
exit(1);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, argv[1]);
if (connect(sock, &server, sizeof(struct sockaddr_un)) < 0) {
close(sock);
perror("connecting stream socket");
exit(1);
}
if (write(sock, DATA, sizeof(DATA)) < 0)
perror("writing on stream socket");
if (write(sock, DATA, sizeof(DATA)) < 0)
perror("writing on stream socket");
if (write(sock, DATA, sizeof(DATA)) < 0)
perror("writing on stream socket");
exit(0);
}