10-18-2004
Hai Arun
Quote:
Hai,
How cani declare socket and collect the data in a string varialbe.
Since i am new to this i am asking this.
Can we connect multiple port.
Thank you.
Arun there are some built-in functions and structures available in C language to create and communicate through sockets. The recv function itself gets the recieved value from the socket in a string variable.
here is a good links for you to learn the system programing, sockets and all.
Let me give you some more good sites in the due-course
Good luck to your start
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UDP(4P) UDP(4P)
NAME
udp - Internet User Datagram Protocol
SYNOPSIS
#include <sys/socket.h>
#include <netinet/in.h>
s = socket(AF_INET, SOCK_DGRAM, 0);
DESCRIPTION
UDP is a simple, unreliable datagram protocol which is used to support the SOCK_DGRAM abstraction for the Internet protocol family. UDP
sockets are connectionless, and are normally used with the sendto and recvfrom calls, though the connect(2) call may also be used to fix
the destination for future packets (in which case the recv(2) or read(2) and send(2) or write(2) system calls may be used).
UDP address formats are identical to those used by TCP. In particular UDP provides a port identifier in addition to the normal Internet
address format. Note that the UDP port space is separate from the TCP port space (i.e. a UDP port may not be "connected" to a TCP port).
In addition broadcast packets may be sent (assuming the underlying network supports this) by using a reserved "broadcast address"; this
address is network interface dependent.
Options at the IP transport level may be used with UDP; see ip(4P).
DIAGNOSTICS
A socket operation may fail with one of the following errors returned:
[EISCONN] when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the destina-
tion address specified and the socket is already connected;
[ENOTCONN] when trying to send a datagram, but no destination address is specified, and the socket hasn't been connected;
[ENOBUFS] when the system runs out of memory for an internal data structure;
[EADDRINUSE] when an attempt is made to create a socket with a port which has already been allocated;
[EADDRNOTAVAIL]
when an attempt is made to create a socket with a network address for which no network interface exists.
SEE ALSO
getsockopt(2), recv(2), send(2), socket(2), intro(4N), inet(4F), ip(4P)
4.2 Berkeley Distribution May 16, 1986 UDP(4P)