1. ECS152b Behrooz Khorashadi
Socket Tutorial
ECS152b
Behrooz Khorashadi

2. Don’t Forget #include <sys/socket.h>
#include <arpa/inet.h>

3. Socket Construction
int socket(int protocolFamily, int type, int protocol)
int sockID = socket(PF_INET, SOCK_STREAM, 0);
int sockID = socket(PF_INET, SOCK_DGRAM, 0);
Return >0 or -1 for error
AF_INET or PF_INET

4. Socket Connection
int connect(int socket, struct sockaddr *serveraddress, unsigned address)
connect(sockID, &serv_addr, sizeof(serv_addr))
serv_addr is actully of type sockaddr_in

5. Socket Send
int send (int socket, const void * msg, unsigned int msglength, int flag)
int stringlength= strlen(stringUsend)
send(sockID, stringUsend, stringlength, 0)
Send will block until send has completed

6. Socket Receive
int recv(int socket, void *rcvBuffer, unsigned int bufferLength, int flag)
Recv(sockID, recvBuffer, buffersize-1, 0)
recvBuffer is a char buffer you create of you own size.
You can use a while loop

7. Socket Close
… close(sockID)…
This should be done on the client side.

8. More Help A good place to start Internet

9. Struct for Sockets struct sockaddr_in {
short sin_family; /* must be AF_INET */ u_short sin_port;
struct in_addr sin_addr;
char sin_zero[8]; /* Not used, must be zero */ };
Struct sockaddr{
usigned short sa_family;
char some_data[14]