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32 .\" @(#)icmp.4 8.1 (Berkeley) 6/5/93
40 .Nd Internet Control Message Protocol
42 .Fd #include <sys/types.h>
43 .Fd #include <sys/socket.h>
44 .Fd #include <netinet/in.h>
46 .Fn socket AF_INET SOCK_RAW proto
49 is the error and control message protocol used
52 and the Internet protocol family. It may be accessed
55 for network monitoring
56 and diagnostic functions.
59 parameter to the socket call to create an
63 .Xr getprotobyname 3 .
65 sockets are connectionless,
66 and are normally used with the
72 call may also be used to fix the destination for future
73 packets (in which case the
81 system calls may be used).
83 Outgoing packets automatically have an
86 them (based on the destination address).
87 Incoming packets are received with the
89 header and options intact.
91 A socket operation may fail with one of the following errors returned:
92 .Bl -tag -width [EADDRNOTAVAIL]
94 when trying to establish a connection on a socket which
95 already has one, or when trying to send a datagram with the destination
96 address specified and the socket is already connected;
98 when trying to send a datagram, but
99 no destination address is specified, and the socket hasn't been
102 when the system runs out of memory for
103 an internal data structure;
104 .It Bq Er EADDRNOTAVAIL
105 when an attempt is made to create a
106 socket with a network address for which no network interface