05-09-2007
UDP socket - can both client and server recv and send
Hi,
Am very new to socket programming.
When we use UDP sockets to communicate between two processess,
will both the client/server socket be able to send/recv ?
meaning can sendto()/ recvfrom() be used on both server and client?
It could be useful even if anybody provide some link on socket programming in C.
Thanks
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
i want to send email from server to the client's email-id. server is solaris. please help me out.i want to send mail to the email-id not to the var/spool/mail. (8 Replies)
Discussion started by: parmeet
8 Replies
2. UNIX for Dummies Questions & Answers
I'm new to socket programming. Have a basic doubt.
I have a structure(global) at the server side.
I have two different client connecting to the server. Will the changes made by one client on the structure be visible to the other client when it accesses the same client? I'm creating a STREAM... (3 Replies)
Discussion started by: abc.working
3 Replies
3. Programming
I have a question regarding the recv syscall.
Suppose I have a client/server and the following exchange of message took place:
Client --> Server using multiple send syscalls one after another immediately:
send "Packet1"
send "Packet2"
send "Packet3"
Server receives in the... (2 Replies)
Discussion started by: heljy
2 Replies
4. Programming
Problem
- Linux Client/Server Socket Application: Preventing Client from quitting on server crash
Hi,
I am writing a Linux socket Server and Client using TCP protocol on Ubuntu 9.04 x64.
I am having problem trying to implement a scenario where the client should keep running even when the... (2 Replies)
Discussion started by: varun.nagpaal
2 Replies
5. IP Networking
Hello !
I seem to have the same problem as in https://www.unix.com/ip-networking/91203-inaddr_any-opposite.html#post302262417
But I can't find a solution.
I have a UDP server socket bound to 0.0.0.0. The server hosts the addresses IP1, IP2 and IP3. I get an incoming request to IP1. I use... (1 Reply)
Discussion started by: steinwej
1 Replies
6. Programming
char name;
printf ("Welcome to the server \n");
printf ("Enter user name: \n");
scanf ("%c", &name);
how can client send name to server:what should be the code?
int send ( int sid , const char ∗buffer Ptr , int len , int f l a g )
how can client receive ack from... (1 Reply)
Discussion started by: saiful_911
1 Replies
7. Programming
hei,
i want to enter name and read it by client server socket program after checking name validity put the password and check.if ok than server clirnt say correct other wise incorrect.
below my code:
char name;
printf ("Welcome to the server \n");
printf ("Enter user name: \n");
scanf... (1 Reply)
Discussion started by: saiful_911
1 Replies
8. Programming
Hi,
I have a situation where i need to communicate a linux client with a windows server, I am using a UDP socket communication channel. I am able to send packets from my linux clients to the windows server but unable to receive any data packet from the server. Do i need to make any setting in... (0 Replies)
Discussion started by: John20
0 Replies
9. Programming
Hello people.
I'm trying to do something like a search engine.
Server runs in the background by using ./server & which has data from a textfile stored in an array.
Client then runs by using ./client
It will then prompt "Search for:"
For example, if I searched for Products called Instant... (0 Replies)
Discussion started by: andylbh
0 Replies
10. Programming
I'm trying to make a "dual/server client" (ipv4,ipv6) with sockets in linux but i don't know how to join both codes. I have a dual client ipv4 and ipv6, but i have problems with the server if you notice the only difference between them it's the AF_INET (pf_inet ipv4, and if_inet6 ipv6) and the port... (3 Replies)
Discussion started by: godna
3 Replies
udp(7) Miscellaneous Information Manual udp(7)
NAME
udp - Internet user datagram protocol (UDP)
SYNOPSIS
#include <sys/socket.h> #include <netinet/in.h>
The following is the socket call for AF_INET sockets:
s = socket(AF_INET, SOCK_DGRAM, 0); The following is the socket call for AF_INET6 sockets:
s = socket(AF_INET6, SOCK_DGRAM, 0);
DESCRIPTION
UDP is a simple, unreliable datagram protocol that 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() functions, though the connect() function may also be
used to fix the destination for future packets, in which case the recv() or read() and send() or write() functions 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 (that is, a UDP port may not be "connected" to a TCP
port). In addition, IPv4 broadcast packets may be sent (assuming the underlying network supports this) by using a reserved "broadcast
address"; this address is network interface dependent. There is no broadcast address in IPv6.
Options at the IP transport level may be used with UDP; see the ip() reference page.
ERRORS
If a socket operation fails, errno may be set to one of the following values: An attempt was made to create a socket with a port that has
already been allocated. An attempt was made to create a socket with a network address for which no network interface exists. The socket
is already connected. This error occurs when trying to establish connection on a socket or when trying to send a datagram with the desti-
nation address specified. The system ran out of memory for an internal data structure. The destination address of a datagram was not
specified, and the socket has not been connected.
RELATED INFORMATION
Functions: getsockopt(2), recv(2), send(2), socket(2)
Files: netintro(7), inet(7), ip(7) delim off
udp(7)