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+/* Byte Stream Socket Example
+ Copyright (C) 1991-2017 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ as published by the Free Software Foundation; either version 2
+ of the License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+
+#define PORT 5555
+#define MESSAGE "Yow!!! Are we having fun yet?!?"
+#define SERVERHOST "www.gnu.org"
+
+void
+write_to_server (int filedes)
+{
+ int nbytes;
+
+ nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1);
+ if (nbytes < 0)
+ {
+ perror ("write");
+ exit (EXIT_FAILURE);
+ }
+}
+
+
+int
+main (void)
+{
+ extern void init_sockaddr (struct sockaddr_in *name,
+ const char *hostname,
+ uint16_t port);
+ int sock;
+ struct sockaddr_in servername;
+
+ /* Create the socket. */
+ sock = socket (PF_INET, SOCK_STREAM, 0);
+ if (sock < 0)
+ {
+ perror ("socket (client)");
+ exit (EXIT_FAILURE);
+ }
+
+ /* Connect to the server. */
+ init_sockaddr (&servername, SERVERHOST, PORT);
+ if (0 > connect (sock,
+ (struct sockaddr *) &servername,
+ sizeof (servername)))
+ {
+ perror ("connect (client)");
+ exit (EXIT_FAILURE);
+ }
+
+ /* Send data to the server. */
+ write_to_server (sock);
+ close (sock);
+ exit (EXIT_SUCCESS);
+}