I am new in Unix/Linux networking programming, so I have written server-client program in below.In this code there is one socket between client and server, client requests to server, then server responses from 1 to 100 numbers to client. So my question is how can we do this process with 3 socket( tcp connection) without using thread? ( e.g. First socket runs then second runs then third runs then first again .. ) Do you have any suggestion? Thank you
client.c
int main()
{
int sock;
struct sockaddr_in sa;
int ret;
char buf[1024];
int x;
sock = socket (AF_INET, SOCK_STREAM, 0);
bzero (&sa, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(SERVER_PORT);
inet_pton (AF_INET, SERVER_IP, &sa.sin_addr);
ret = connect (sock,
(const struct sockaddr *) &sa,sizeof (sa));
if (ret != 0) {
printf ("connect failed\n");
exit (0);
}
x = 0;
while (x != -1) {
read (sock, buf , sizeof(int));
x = ntohl(*((int *)buf));
if (x != -1)
printf ("int rcvd = %d\n", x);
}
close (sock);
exit (0);
}
server.c
int main()
{
int list_sock;
int conn_sock;
struct sockaddr_in sa, ca;
socklen_t ca_len;
char buf[1024];
int i;
char ipaddrstr[IPSTRLEN];
list_sock = socket (AF_INET, SOCK_STREAM, 0);
bzero (&sa, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(INADDR_ANY);
sa.sin_port = htons(SERVER_PORT);
bind (list_sock,(struct sockaddr *) &sa,sizeof(sa));
listen (list_sock, 5);
while (1){
bzero (&ca, sizeof(ca));
ca_len = sizeof(ca); // important to initialize
conn_sock = accept (list_sock,(struct sockaddr *) &ca,&ca_len);
printf ("connection from: ip=%s port=%d \n",inet_ntop(AF_INET, &(ca.sin_addr),
ipaddrstr, IPSTRLEN),ntohs(ca.sin_port));
for (i=0; i<100; ++i){
*((int *)buf) = htonl(i+20);
// we using converting to network byte order
write (conn_sock, buf, sizeof(int));
}
* ((int *)buf) = htonl(-1);
write (conn_sock, buf, sizeof(int));
close (conn_sock);
printf ("server closed connection to client\n");
}
}
