icmp man page on Ultrix

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icmp(4p)							      icmp(4p)

Name
       icmp - Internet Control Message Protocol

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

       s = socket(AF_INET, SOCK_RAW, proto);

Description
       The ICMP is the error and control message protocol used by the Internet
       Protocol (IP) transport layer and the Internet protocol family.	It can
       be  accessed  through a ``raw socket'' for network monitoring and diag‐
       nostic functions.  The proto argument to the socket call to  create  an
       ICMP socket is obtained from the routine.  ICMP sockets are connection‐
       less, and are normally used with the and system calls.	The  call  can
       also  be	 used to fix the destination for future packets (in which case
       the or and or system calls can then be used).

       Outgoing packets automatically have an  IP  header  prepended  to  them
       (based on the destination address).  Incoming packets are received with
       the IP header and options intact.

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

       [EISCONN]      Tried to establish a connection on a socket that already
		      has  one,	 or tried to send a datagram with the destina‐
		      tion address specified and the socket was	 already  con‐
		      nected.

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

       [ENOBUFS]      The system ran out of memory for an internal data struc‐
		      ture.

       [EADDRNOTAVAIL]
		      An  attempt  was	made to create a socket with a network
		      address for which no network interface exists.

See Also
       inet(4f), intro(4n), ip(4p)

								      icmp(4p)
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