Agilent Technologies E8257C - Page 87

Chapter 2 81
Programming Examples
LAN Programming Examples
*
***************************************************************************/
SOCKET openSocket(const char *hostname, int portNumber)
{
struct hostent *hostPtr;
struct sockaddr_in peeraddr_in;
SOCKET s;
memset(&peeraddr_in, 0, sizeof(struct sockaddr_in));
/***********************************************/
/* map the desired host name to internal form. */
/***********************************************/
hostPtr = gethostbyname(hostname);
if (hostPtr == NULL)
{
fprintf(stderr,"unable to resolve hostname '%s'\n", hostname);
return INVALID_SOCKET;
}
/*******************/
/* create a socket */
/*******************/
s = socket(AF_INET, SOCK_STREAM, 0);
if (s == INVALID_SOCKET)
{
fprintf(stderr,"unable to create socket to '%s': %s\n",
hostname, strerror(errno));
return INVALID_SOCKET;
}