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ip(4p) [ultrix man page]

ip(4p)																	    ip(4p)

       ip - Internet Protocol

       #include <sys/socket.h>
       #include <netinet/in.h>

       s = socket(AF_INET, SOCK_RAW, 0);

       The  IP	is the transport layer protocol used by the Internet protocol family.  It can be accessed through a ``raw socket'' when developing
       new protocols or special purpose applications.  IP sockets are connectionless and are normally used with the and calls.	The call, however,
       can also be used to fix the destination for future packets, in which case the or and or system calls can be used.

       Outgoing  packets automatically have an IP header prepended to them, based on the destination address and the protocol number the socket is
       created with.  Incoming packets are received with their IP headers and options intact.

       On failure, a socket operation returns any of the following errors:

       [EISCONN]      Tried to establish a connection on a socket that already had one, or tried to send a datagram with the  destination  address
		      specified when the socket was already connected.

       [ENOTCONN]     Tried to send a datagram, but no destination address was specified and the socket was not connected.

       [ENOBUFS]      The system ran out of memory for an internal data structure.

		      Made an attempt to create a socket with a network address for which no network interface existed.

See Also
       send(2), recv(2), inet(4f), intro(4n), packetfilter(4)


Check Out this Related Man Page

udp(4p) 																   udp(4p)

       udp - Internet User Datagram Protocol

       #include <sys/socket.h>
       #include <netinet/in.h>

       s = socket(AF_INET, SOCK_DGRAM, 0);

       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 and calls, though the call can also be used to fix  the  destination  for  future
       packets (in which case the or and or 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 (for example,	a UDP port may not be ``connected''  to  a
       TCP  port).   In  addition  broadcast  packets  can be sent (assuming the underlying network supports this) by using a reserved ``broadcast
       address''; this address is network interface dependent.	The SO_BROADCAST option must be set on the socket for broadcasting to succeed.

       A socket operation may fail with one of the following errors returned:

       [EISCONN]      Try to establish a connection on a socket which already has one, or when trying to send  a  datagram  with  the  destination
		      address specified and the socket already connected.

       [ENOTCONN]     Try to send a datagram, but no destination address is specified, and the socket has not been connected.

       [ENOBUFS]      The system runs out of memory for an internal data structure.

       [EADDRINUSE]   An attempt is made to create a socket with a port that has already been allocated.

		      An attempt is made to create a socket with a network address for which no network interface exists.

See Also
       getsockopt(2), send(2), socket(2) recv(2), intro(4n), inet(4f)

Man Page

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