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NAME

       gethostid,  sethostid - get or set the unique identifier of the current
       host

SYNOPSIS

       #include <unistd.h>

       long gethostid(void);
       int sethostid(long hostid);

DESCRIPTION

       Get or set a unique 32-bit identifier for  the  current  machine.   The
       32-bit  identifier  is  intended to be unique among all UNIX systems in
       existence. This normally resembles the Internet address for  the  local
       machine,  as returned by gethostbyname(3), and thus usually never needs
       to be set.

       The sethostid() call is restricted to the superuser.

       The hostid argument is stored in the file /etc/hostid.

RETURN VALUE

       gethostid() returns the 32-bit identifier for the current host  as  set
       by sethostid(2).

CONFORMING TO

       4.2BSD.   These  functions  were  dropped  in 4.4BSD.  POSIX.1 does not
       define these  functions,  but  ISO/IEC  9945-1:1990  mentions  them  in
       B.4.4.1.  SVr4 includes gethostid() but not sethostid().

FILES

       /etc/hostid

SEE ALSO

       hostid(1), gethostbyname(3)