gethostid(3)               Library Functions Manual               gethostid(3)

<?><?><?>
       gethostid, sethostid - <?><?><?><?><?><?><?><?><?><?> <?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?>

LIBRARY
       Standard C library (libc, -lc)

<?><?><?><?><?><?><?><?><?>
       #include <unistd.h>

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

   <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>
   <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?><?> glibc
   (<?><?>. feature_test_macros(7)):

       gethostid():
           Since glibc 2.20:
               _DEFAULT_SOURCE || _XOPEN_SOURCE >= 500
           Up to and including glibc 2.19:
               _BSD_SOURCE || _XOPEN_SOURCE >= 500

       sethostid():
           <?><?><?><?><?><?><?> <?> glibc 2.21:
               _DEFAULT_SOURCE
           <?> glibc 2.19 <?> 2.20:
               _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
           <?><?> glibc 2.19, <?><?><?><?><?><?><?><?><?><?><?><?>:
               _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)

<?><?><?><?><?><?><?><?>
       gethostid()  and 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
       gethostbyname(3), and thus usually never needs to be set.

       <?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?><?> sethostid().

<?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> gethostid() <?><?><?><?><?><?><?><?><?><?>
       32-<?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?>,
       <?><?><?><?><?><?><?><?><?><?><?><?><?> sethostid().

       <?><?><?> <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?>
       sethostid() <?><?><?><?><?><?><?><?><?><?> 0; <?><?><?>
       <?><?><?><?><?><?> -- -1, <?> <?> errno <?><?><?><?><?><?><?><?>
       <?><?><?> <?><?><?><?><?><?>.

<?><?><?><?><?><?>
       <?><?><?><?><?> sethostid() <?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?>:

       EACCES <?><?><?><?><?><?><?><?><?><?> <?><?> <?><?><?><?><?>
              <?><?><?><?> <?><?> <?><?><?><?><?><?> <?> <?><?><?><?>,
              <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?>
              <?><?><?><?><?><?><?><?> ID <?><?><?><?>.

       EPERM  <?><?><?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?>
              <?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?> <?>
              <?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?>
              <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.

<?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> <?> attributes(7).

       +----------------------------+----------------------------------------------------------+--------------------------+
       |<?><?><?><?><?><?><?><?><?> | <?><?><?><?><?><?><?>                                    | <?><?><?><?><?><?><?><?> |
       +----------------------------+----------------------------------------------------------+--------------------------+
       |gethostid()                 | <?><?><?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?> | MT-Safe hostid env       |
       |                            |                                                          | locale                   |
       +----------------------------+----------------------------------------------------------+--------------------------+
       |sethostid()                 | <?><?><?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?> | MT-Unsafe const:hostid   |
       +----------------------------+----------------------------------------------------------+--------------------------+
<?><?><?><?><?><?>
       In the glibc implementation, the hostid is stored in the file
       /etc/hostid.  (Before glibc 2.2, the file /var/adm/hostid was used.)

       <?> <?><?><?><?><?><?><?><?><?><?> glibc, <?><?><?><?> gethostid()
       <?><?> <?><?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?>,
       <?><?><?><?><?><?><?><?><?><?> ID <?><?><?><?>, <?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?> <?><?><?><?> <?>
       <?><?><?><?><?><?><?> gethostname(2), <?><?><?><?><?><?><?><?>
       <?><?><?> <?><?><?> gethostbyname_r(3) <?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?> IPv4 <?><?><?><?>, <?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?> IPv4
       (<?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?><?><?><?> <?><?><?><?>
       <?><?> <?><?><?><?><?><?><?><?><?>).

<?><?><?><?><?><?><?><?><?>
       gethostid()
              POSIX.1-2008.

       sethostid()
              None.

<?><?><?><?><?><?><?>
       4.2BSD; dropped in 4.4BSD.  SVr4 and POSIX.1-2001 include gethostid()
       but not sethostid().

<?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?>, <?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?>.

<?><?>. <?><?><?><?><?>
       hostid(1), gethostbyname(3)

<?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?> <?><?><?>
       <?><?><?><?><?><?> Azamat Hackimov <azamat.hackimov@gmail.com>, Dmitry
       Bolkhovskikh <d20052005@yandex.ru>, Vladislav
       <ivladislavefimov@gmail.com>, Yuri Kozlov <yuray@komyakino.ru> <?>
       <?><?><?><?> <?><?><?><?><?><?> <pavia00@gmail.com>

       <?><?><?><?> <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?><?><?>;
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> GNU
       <?><?><?><?><?><?> 3 <https://www.gnu.org/licenses/gpl-3.0.html>
       <?><?><?> <?><?><?><?><?> <?><?><?><?><?><?><?>, <?><?><?><?><?>
       <?><?><?><?><?><?> <?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?>. <?><?> <?><?>
       <?><?><?><?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.

       <?><?><?><?> <?><?> <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?>
       <?> <?><?><?><?><?><?><?><?> <?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?>, <?><?><?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?> <?><?> <man-pages-ru-talks@lists.sourceforge.net>.

Linux man-pages 6.06  31 <?><?><?><?><?><?><?> 2023 <?>.          gethostid(3)