09-08-2002
TCP Programming problems with 'recv'
Hey,
I am learning to program a TCP server and managed to get it up and running (I am using Windows 98SE).
I can use the send function to send information to the client and I can use the recv function to ask the user to pass information through, but when I do so it only allows the client to send one character and then adds a load of jibberish symbols to the string.
I think the problem may have to do with the flags (I am using 0), but this is what I have:
recv(ServerDesc,ClientInput,30,0);
Could someone please tell me what I am doing wrong, or if there is an easier way to do what I'm trying to do? Any advice would be fantastic.
Paul
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UDP(4) BSD Kernel Interfaces Manual UDP(4)
NAME
udp -- Internet User Datagram Protocol
SYNOPSIS
#include <sys/socket.h>
#include <netinet/in.h>
int
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) or connectx(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(4).
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
connect(2), connectx(2), getsockopt(2), recv(2), send(2), socket(2), inet(4), intro(4), ip(4)
HISTORY
The udp protocol appeared in 4.2BSD.
4.2 Berkeley Distribution March 18, 2015 4.2 Berkeley Distribution