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- IIIICCCCMMMMPPPP((((7777PPPP)))) IIIICCCCMMMMPPPP((((7777PPPP))))
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- NNNNAAAAMMMMEEEE
- icmp - Internet Control Message Protocol
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- ####iiiinnnncccclllluuuuddddeeee <<<<ssssyyyyssss////ssssoooocccckkkkeeeetttt....hhhh>>>>
- ####iiiinnnncccclllluuuuddddeeee <<<<nnnneeeettttiiiinnnneeeetttt////iiiinnnn....hhhh>>>>
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- ssss ==== ssssoooocccckkkkeeeetttt((((AAAAFFFF____IIIINNNNEEEETTTT,,,, SSSSOOOOCCCCKKKK____RRRRAAAAWWWW,,,, pppprrrroooottttoooo))));;;;
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- ICMP is the error and control message protocol used by IP and the
- Internet protocol family. It may be accessed through a "raw socket" for
- network monitoring and diagnostic functions. The _p_r_o_t_o parameter to the
- socket call to create an ICMP socket is obtained from _g_e_t_p_r_o_t_o_b_y_n_a_m_e(3N).
- ICMP sockets are connectionless, and are normally used with the _s_e_n_d_t_o
- and _r_e_c_v_f_r_o_m calls, though the _c_o_n_n_e_c_t(2) call may also be used to fix
- the destination for future packets (in which case the _r_e_a_d(2) or _r_e_c_v(2)
- and _w_r_i_t_e(2) or _s_e_n_d(2) system calls may be used).
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- 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.
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- DDDDIIIIAAAAGGGGNNNNOOOOSSSSTTTTIIIICCCCSSSS
- A socket operation may fail with one of the following errors returned:
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- [EISCONN] when trying to establish a connection on a socket which
- already has one, or when trying to send a datagram with
- the destination address specified and the socket is
- already connected;
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- [ENOTCONN] when trying to send a datagram, but no destination address
- is specified, and the socket hasn't been connected;
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- [ENOBUFS] when the system runs out of memory for an internal data
- structure;
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- [EADDRNOTAVAIL]
- when an attempt is made to create a socket with a network
- address for which no network interface exists.
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- send(2), recv(2), intro(3), inet(7F), ip(7P)
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- PPPPaaaaggggeeee 1111
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