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GETHOSTID(3)             BSD Library Functions Manual             GETHOSTID(3)

NAME
     gethostid, sethostid -- get/set unique identifier of current host

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     long
     gethostid(void);

     void
     sethostid(long hostid);

DESCRIPTION
     The sethostid() function establishes a 32-bit identifier for the current
     processor.  The id, intended to be unique among all UNIX systems in exis-tence, existence,
     tence, 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.

     The gethostid() function 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(3).

SEE ALSO
     gethostname(3), sysctl(3), sysctl(8)

BUGS
     32 bits for the identifier is too small.

HISTORY
     The gethostid() and sethostid() syscalls appeared in 4.2BSD and were
     dropped in 4.4BSD.

BSD                              June 2, 1993                              BSD