77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
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/* Byte Stream Socket Example
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Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#define PORT 5555
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#define MESSAGE "Yow!!! Are we having fun yet?!?"
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#define SERVERHOST "www.gnu.org"
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void
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write_to_server (int filedes)
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{
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int nbytes;
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nbytes = write (filedes, MESSAGE, strlen (MESSAGE) + 1);
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if (nbytes < 0)
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{
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perror ("write");
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exit (EXIT_FAILURE);
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}
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}
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int
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main (void)
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{
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extern void init_sockaddr (struct sockaddr_in *name,
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const char *hostname,
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uint16_t port);
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int sock;
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struct sockaddr_in servername;
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/* Create the socket. */
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sock = socket (PF_INET, SOCK_STREAM, 0);
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if (sock < 0)
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{
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perror ("socket (client)");
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exit (EXIT_FAILURE);
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}
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/* Connect to the server. */
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init_sockaddr (&servername, SERVERHOST, PORT);
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if (0 > connect (sock,
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(struct sockaddr *) &servername,
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sizeof (servername)))
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{
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perror ("connect (client)");
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exit (EXIT_FAILURE);
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}
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/* Send data to the server. */
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write_to_server (sock);
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close (sock);
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exit (EXIT_SUCCESS);
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}
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