Example of getnameinfo()

• int s; /* socket */

• ssize_t cc;

• char buf[256];

• struct sockaddr_storage ss;

• socklen_t sslen = sizeof(ss);

• char hbuf[NI_MAXHOST], serv[NI_MAXSERV];

• sslen = sizeof(ss);

• cc = recvfrom(s, buf, sizeof(buf),

• (struct sockaddr *)&ss, &sslen);

• if (cc >= 0 &&

• getnameinfo((struct sockaddr *)&ss, sslen,

• hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),

• NI_NUMERICHOST|NI_NUMERICSERV) == 0) {

• printf(“%d bytes from %s port %s\n”,

• (int)cc, hbuf, pbuf);

• }

Notes: