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32 .\" @(#)icmp.4 8.1 (Berkeley) 6/5/93
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41 .Nd Internet Control Message Protocol
47 .Fn socket AF_INET SOCK_RAW proto
50 is the error and control message protocol used
53 and the Internet protocol family. It may be accessed
56 for network monitoring
57 and diagnostic functions.
60 parameter to the socket call to create an
64 .Xr getprotobyname 3 .
66 sockets are connectionless,
67 and are normally used with the
73 call may also be used to fix the destination for future
74 packets (in which case the
82 system calls may be used).
84 Outgoing packets automatically have an
87 them (based on the destination address).
88 Incoming packets are received with the
90 header and options intact.
92 A socket operation may fail with one of the following errors returned:
95 when trying to establish a connection on a socket which
96 already has one, or when trying to send a datagram with the destination
97 address specified and the socket is already connected;
99 when trying to send a datagram, but
100 no destination address is specified, and the socket hasn't been
103 when the system runs out of memory for
104 an internal data structure;
105 .It Bq Er EADDRNOTAVAIL
106 when an attempt is made to create a
107 socket with a network address for which no network interface