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icmp(7)
NAME
  icmp - Internet Control Message Protocol

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

  The following is the socket call for sockets using the IPv4 address format:

       s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);

  The following is the socket call for sockets using the IPv6 address format:

       s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);

DESCRIPTION
  The Internet Control Message Protocol (ICMP) is the error and control
  message protocol used by the Internet Protocol (IP) and the Internet
  Protocol family.  It may be accessed through a raw socket for network
  monitoring and diagnostic functions. ICMP sockets are connectionless, and
  are normally used with the sendto() and recvfrom() functions.	 The
  connect() function may also be used to fix the destination for future
  packets, in which case the read() or recv() and write() or send() functions
  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
  If a socket operation fails, errno may be set to one of the following
  values:

  [EISCONN]
      The socket is already connected.	This error occurs when trying to
      establish connection on a socket or when trying to send a datagram with
      the destination address specified.

  [ENOTCONN]
      The destination address of a datagram was not specified, and the socket
      has not been connected.

  [ENOBUFS]
      The system ran out of memory for an internal data structure.

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

SEE ALSO
  Functions: send(2), recv(2)

  Files: netintro(7), inet(7), ip(7)

  RFC 792, Internet Control Message Protocol

  RFC 2463, Internet Control Message Protocol (ICMPv6) for the Internet
  Protocol Version 6 (IPv6)

Index for Section 7

Alphabetical listing for I

Top of page