HP Rp7410 BSD Sockets Interface Programmer's Guide - Page 54

C L I E N T . T C P

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Using Internet Stream Sockets Example Using Internet Stream Sockets /* The port number must be converted first to * host byte order before printing. On most hosts, * this is not necessary, but the ntohs() call is * included here so this program could easily * be ported to a host that does require it. */ printf("Completed %s port %u, %d requests, at %s\n", hostname, ntohs(peeraddr_in.sin_port), reqcnt, ctime(&timevar)); } /* * C L I E N T . T C P * * This example program demonstrates the use of stream * sockets as a BSD Sockets mechanism. This contains the client, * and is intended to operate in conjunction with the server * program found in serv.tcp. Together, these two programs * demonstrate many of the features of sockets, as well as * good conventions for using these features. * * This program requests a service called "example". For it * to function, an entry needs to exist in the /etc/services * file. The port address for this service can be any port * number that is not used, such as 22375, for example. The * host on which the server will be running must also have the * same entry (same port number) in its /etc/services file. * */ #include #include #include #include #include int s; /* connected socket descriptor */ struct hostent *hp; struct servent *sp; /* pointer to host info for remote host */ /* pointer to service information */ long timevar; char *ctime(); /* contains time returned by time() */ /* declare time formatting routine */ struct sockaddr_in myaddr_in; /* for local socket address */ struct sockaddr_in peeraddr_in; /* for peer socket address */ /* * M A I N * * This routine is the client that requests service from the * remote example server. It creates a connection, sends a few * of requests, shuts down the connection in one direction to * signal the server about the end of data, and then receives * all of the responses. Status will be written to stdout. * * The name of the system to which the requests will be sent * is given as a parameter to the command. */ main(argc, argv) 54 Chapter 2

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54
Chapter 2
Using Internet Stream Sockets
Example Using Internet Stream Sockets
/* The port number must be converted first to
* host byte order before printing.
On most hosts,
* this is not necessary, but the ntohs() call is
* included here so this program could easily
* be ported to a host that does require it.
*/
printf(”Completed %s port %u, %d requests, at %s\n”,
hostname, ntohs(peeraddr_in.sin_port), reqcnt,
ctime(&timevar));
}
/*
*
C L I E N T . T C P
*
*
This example program demonstrates the use of stream
*
sockets as a BSD Sockets mechanism.
This contains the client,
*
and is intended to operate in conjunction with the server
*
program found in serv.tcp.
Together, these two programs
*
demonstrate many of the features of sockets, as well as
*
good conventions for using these features.
*
*
This program requests a service called “example”.
For it
*
to function, an entry needs to exist in the /etc/services
*
file.
The port address for this service can be any port
*
number that is not used, such as 22375, for example. The
*
host on which the server will be running must also have the
*
same entry (same port number) in its /etc/services file.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <netdb.h>
int s;
/* connected socket descriptor */
struct hostent *hp;
/* pointer to host info for remote host */
struct servent *sp;
/* pointer to service information */
long timevar;
/* contains time returned by time() */
char *ctime();
/* declare time formatting routine */
struct sockaddr_in myaddr_in;
/* for local socket address */
struct sockaddr_in peeraddr_in; /* for peer socket address */
/*
*
M A I N
*
*
This routine is the client that requests service from the
*
remote example server. It creates a connection, sends a few
*
of requests, shuts down the connection in one direction to
*
signal the server about the end of data, and then receives
*
all of the responses. Status will be written to stdout.
*
*
The name of the system to which the requests will be sent
*
is given as a parameter to the command.
*/
main(argc, argv)