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sethostid(3) [osx man page]

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

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 existence, 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

Check Out this Related Man Page

GETHOSTID(2)						     Linux Programmer's Manual						      GETHOSTID(2)

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) Linux 0.99.13 1993-11-29 GETHOSTID(2)
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