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Man page of udp
udp
Section: Environments, Tables, and Troff Macros (7)
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NAME
udp - Internet user datagram protocol (UDP)
SYNOPSIS
#include <sys/socket.h>
#include <netinet/in.h>
s = socket(AF_INET, 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, 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 the
ip()
reference page.
ERRORS
If a socket operation fails,
errno
may be set to one of the following values:
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 destination
address specified.
The
destination address of a datagram was not
specified, and the socket has not been
connected.
The system ran out of memory for
an internal data structure.
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.
RELATED INFORMATION
Functions:
getsockopt(2),
recv(2),
send(2),
socket(2)
Files:
netintro(7),
inet(7),
ip(7)
delim off
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ERRORS
-
- RELATED INFORMATION
-
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Time: 02:40:19 GMT, October 02, 2010