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-'\" t
-.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
-.\"
-.\" Updated with additions from Mitchum DSouza <m.dsouza@mrc-apu.cam.ac.uk>
-.\" Portions Copyright 1993 Mitchum DSouza <m.dsouza@mrc-apu.cam.ac.uk>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Modified Tue Oct 22 00:22:35 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
-.TH gethostid 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-gethostid, sethostid \- get or set the unique identifier of the current host
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.B long gethostid(void);
-.BI "int sethostid(long " hostid );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR gethostid ():
-.nf
-    Since glibc 2.20:
-        _DEFAULT_SOURCE || _XOPEN_SOURCE >= 500
-.\"        || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-    Up to and including glibc 2.19:
-        _BSD_SOURCE || _XOPEN_SOURCE >= 500
-.\"        || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-.fi
-.P
-.BR sethostid ():
-.nf
-    Since glibc 2.21:
-.\"             commit 266865c0e7b79d4196e2cc393693463f03c90bd8
-        _DEFAULT_SOURCE
-    In glibc 2.19 and 2.20:
-        _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-    Up to and including glibc 2.19:
-        _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-.fi
-.SH DESCRIPTION
-.BR gethostid ()
-and
-.BR sethostid ()
-respectively get or set a unique 32-bit identifier for the current machine.
-The 32-bit identifier was intended to be unique among all UNIX systems in
-existence.
-This normally resembles the Internet address for the local
-machine, as returned by
-.BR gethostbyname (3),
-and thus usually never needs to be set.
-.P
-The
-.BR sethostid ()
-call is restricted to the superuser.
-.SH RETURN VALUE
-.BR gethostid ()
-returns the 32-bit identifier for the current host as set by
-.BR sethostid ().
-.P
-On success,
-.BR sethostid ()
-returns 0; on error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.BR sethostid ()
-can fail with the following errors:
-.TP
-.B EACCES
-The caller did not have permission to write to the file used
-to store the host ID.
-.TP
-.B EPERM
-The calling process's effective user or group ID is not the same
-as its corresponding real ID.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lb lb lbx
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR gethostid ()
-T}	Thread safety	T{
-.na
-.nh
-MT-Safe hostid env locale
-T}
-T{
-.na
-.nh
-.BR sethostid ()
-T}	Thread safety	T{
-.na
-.nh
-MT-Unsafe const:hostid
-T}
-.TE
-.SH VERSIONS
-In the glibc implementation, the
-.I hostid
-is stored in the file
-.IR /etc/hostid .
-(Before glibc 2.2, the file
-.I /var/adm/hostid
-was used.)
-.\" libc5 used /etc/hostid; libc4 didn't have these functions
-.P
-In the glibc implementation, if
-.BR gethostid ()
-cannot open the file containing the host ID,
-then it obtains the hostname using
-.BR gethostname (2),
-passes that hostname to
-.BR gethostbyname_r (3)
-in order to obtain the host's IPv4 address,
-and returns a value obtained by bit-twiddling the IPv4 address.
-(This value may not be unique.)
-.SH STANDARDS
-.TP
-.BR gethostid ()
-POSIX.1-2008.
-.TP
-.BR sethostid ()
-None.
-.SH HISTORY
-4.2BSD; dropped in 4.4BSD.
-SVr4 and POSIX.1-2001 include
-.BR gethostid ()
-but not
-.BR sethostid ().
-.SH BUGS
-It is impossible to ensure that the identifier is globally unique.
-.SH SEE ALSO
-.BR hostid (1),
-.BR gethostbyname (3)