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| <h4 class="subsection">16.9.6 Byte Stream Socket Example</h4> |
| |
| <p>Here is an example client program that makes a connection for a byte |
| stream socket in the Internet namespace. It doesn't do anything |
| particularly interesting once it has connected to the server; it just |
| sends a text string to the server and exits. |
| |
| <p>This program uses <code>init_sockaddr</code> to set up the socket address; see |
| <a href="Inet-Example.html#Inet-Example">Inet Example</a>. |
| |
| <pre class="smallexample"> #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 "mescaline.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; |
| |
| /* <span class="roman">Create the socket.</span> */ |
| sock = socket (PF_INET, SOCK_STREAM, 0); |
| if (sock < 0) |
| { |
| perror ("socket (client)"); |
| exit (EXIT_FAILURE); |
| } |
| |
| /* <span class="roman">Connect to the server.</span> */ |
| init_sockaddr (&servername, SERVERHOST, PORT); |
| if (0 > connect (sock, |
| (struct sockaddr *) &servername, |
| sizeof (servername))) |
| { |
| perror ("connect (client)"); |
| exit (EXIT_FAILURE); |
| } |
| |
| /* <span class="roman">Send data to the server.</span> */ |
| write_to_server (sock); |
| close (sock); |
| exit (EXIT_SUCCESS); |
| } |
| </pre> |
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