4.4BSD/usr/share/man/cat2/sethostid.0

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GETHOSTID(3)                BSD Programmer's Manual               GETHOSTID(3)

NNAAMMEE
     ggeetthhoossttiidd, sseetthhoossttiidd - get/set unique identifier of current host

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<uunniissttdd..hh>>

     _l_o_n_g
     ggeetthhoossttiidd(_v_o_i_d);

     _i_n_t
     sseetthhoossttiidd(_l_o_n_g _h_o_s_t_i_d);

DDEESSCCRRIIPPTTIIOONN
     SSeetthhoossttiidd() establishes a 32-bit identifier for the current processor
     that is intended to be unique among all UNIX systems in existence.  This
     is normally a DARPA Internet address for the local machine.  This call is
     allowed only to the super-user and is normally performed at boot time.

     GGeetthhoossttiidd() returns the 32-bit identifier for the current processor.

     This function has been deprecated.  The hostid should be set or retrieved
     by use of sysctl(2).

SSEEEE AALLSSOO
     sysctl(2),  gethostname(3),  sysctl(8).

BBUUGGSS
     32 bits for the identifier is too small.

HHIISSTTOORRYY
     The ggeetthhoossttiidd() and sseetthhoossttiidd() syscalls appeared in 4.2BSD and were
     dropped in 4.4BSD.

4.2 Berkeley Distribution        June 2, 1993                                1