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This code fragment is part of the same IPv4 client program that
ships in the HP-UX 11i IPv6 /usr/lib/demos/networking/socket directory. The client requests a service called “example.” Add an entry to the /etc/services for “example”. Assign any unused port number, such
as 22375, to the service “example” for a port address. The host running
the server must also have the same port number assigned to “example” in the /etc/services file. |
struct sockaddr_in peeraddr_in; /* for peer socket address */
memset ((char *)&peeraddr_in, 0, sizeof(struct sockaddr_in));hp = gethostbyname (argv[1]); if (hp == NULL) {
fprintf(stderr, "%s: %s not found in /etc/hosts\n",
argv[0], argv[1]);
exit(1);
}peeraddr_in.sin_addr.s_addr = ((struct in_addr *)(hp->h_addr))->s_addr; /* Find the information for the "example" server
* in order to get the needed port number.
*/sp = getservbyname ("example", "tcp");if (sp == NULL) {
fprintf(stderr, "%s: example not found in /etc/services\n argv[0]);
exit(1);
}
peeraddr_in.sin_port = sp->s_port;
/* Create the socket. */
s = socket (AF_INET, SOCK_STREAM, 0);
if (s == -1) {
perror(argv[0]);
fprintf(stderr, "%s: unable to create socket\n", argv[0]);
exit(1);
}
/* Try to connect to the remote server at the address put in peeraddr.
*/
if (connect(s, &peeraddr_in, sizeof(struct sockaddr_in)) == -1{ perror(argv[0]);
fprintf(stderr, "%s: unable to connect to remote\n", argv[0]);
exit(1);
} |
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