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ICMP(4)		       FreeBSD Kernel Interfaces Manual		       ICMP(4)

NAME
     icmp -- Internet Control Message Protocol

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

     int
     socket(AF_INET, SOCK_RAW, proto);

DESCRIPTION
     ICMP is the error and control message protocol used by IP and the Inter-
     net protocol family.  It may be accessed through a	``raw socket'' for
     network monitoring	and diagnostic functions.  The proto parameter to the
     socket call to create an ICMP socket is obtained from getprotobyname(3).
     ICMP sockets are connectionless, and are normally used with the sendto(2)
     and recvfrom(2) calls, though the connect(2) call may also	be used	to fix
     the destination for future	packets	(in which case the read(2) or recv(2)
     and write(2) or send(2) system calls may 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.

ERRORS
     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	data-
			gram with the destination 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 con-
			nected;

     [ENOBUFS]		when the system	runs out of memory for an internal
			data structure;

     [EADDRNOTAVAIL]	when an	attempt	is made	to create a socket with	a net-
			work address for which no network interface exists.

SEE ALSO
     recv(2), send(2), inet(4),	intro(4), ip(4)

HISTORY
     The icmp protocol appeared	in 4.3BSD.

FreeBSD	9.2			 June 5, 1993			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | ERRORS | SEE ALSO | HISTORY

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