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sethostid (2)
  • sethostid (2) ( Русские man: Системные вызовы )
  • >> sethostid (2) ( Linux man: Системные вызовы )
  • sethostid (3) ( FreeBSD man: Библиотечные вызовы )
  •  

    NAME

    gethostid, sethostid - get or set the unique identifier of the current host
     
    

    SYNOPSIS

    #include <unistd.h>

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

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    sethostid(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)  

    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().  

    FILES

    /etc/hostid  

    CONFORMING TO

    4.2BSD; these functions were dropped in 4.4BSD. SVr4 includes gethostid() but not sethostid(). POSIX.1-2001 specifies gethostid() but not sethostid().  

    NOTES

    In the glibc implementation, if gethostid() cannot open /etc/hostid, then it obtains the hostname using gethostname(2), passes that hostname to 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.)  

    SEE ALSO

    hostid(1), gethostbyname(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    FILES
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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