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Annotation of 43BSDReno/share/man/man4/icmp.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1986 Regents of the University of California.
                      2: .\" All rights reserved.
                      3: .\"
                      4: .\" Redistribution and use in source and binary forms are permitted provided
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                     18: .\"    @(#)icmp.4      6.5 (Berkeley) 6/23/90
                     19: .\"
                     20: .TH ICMP 4 "June 23, 1990"
                     21: .UC 6
                     22: .SH NAME
                     23: icmp \- Internet Control Message Protocol
                     24: .SH SYNOPSIS
                     25: .B #include <sys/socket.h>
                     26: .br
                     27: .B #include <netinet/in.h>
                     28: .PP
                     29: .B s = socket(AF_INET, SOCK_RAW, proto);
                     30: .SH DESCRIPTION
                     31: ICMP is the error and control message protocol used
                     32: by IP and the Internet protocol family.  It may be accessed
                     33: through a \*(lqraw socket\*(rq for network monitoring
                     34: and diagnostic functions.
                     35: The
                     36: .I proto
                     37: parameter to the socket call to create an ICMP socket
                     38: is obtained from
                     39: .IR getprotobyname (3).
                     40: ICMP sockets are connectionless,
                     41: and are normally used with the
                     42: .I sendto 
                     43: and
                     44: .I recvfrom 
                     45: calls, though the
                     46: .IR connect (2)
                     47: call may also be used to fix the destination for future
                     48: packets (in which case the 
                     49: .IR read (2)
                     50: or
                     51: .IR recv (2)
                     52: and 
                     53: .IR write (2)
                     54: or
                     55: .IR send (2)
                     56: system calls may be used).
                     57: .PP
                     58: Outgoing packets automatically have an IP header prepended to
                     59: them (based on the destination address).
                     60: Incoming packets are received with the IP header and options intact.
                     61: .SH DIAGNOSTICS
                     62: A socket operation may fail with one of the following errors returned:
                     63: .TP 15
                     64: [EISCONN]
                     65: when trying to establish a connection on a socket which
                     66: already has one, or when trying to send a datagram with the destination
                     67: address specified and the socket is already connected;
                     68: .TP 15
                     69: [ENOTCONN]
                     70: when trying to send a datagram, but
                     71: no destination address is specified, and the socket hasn't been
                     72: connected;
                     73: .TP 15
                     74: [ENOBUFS]
                     75: when the system runs out of memory for
                     76: an internal data structure;
                     77: .TP 15
                     78: [EADDRNOTAVAIL]
                     79: when an attempt is made to create a 
                     80: socket with a network address for which no network interface
                     81: exists.
                     82: .SH SEE ALSO
                     83: send(2), recv(2), intro(4), inet(4), ip(4)

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