gethostid(3) [osx man page]

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
     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)

HISTORY

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

BUGS

     32 bits for the identifier is too small.

BSD
								   June 2, 1993 							       BSD

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

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)

Linux 0.99.13							    1993-11-29							      GETHOSTID(2)