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This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

gethostid — get an identifier for the current host

#include <unistd.h>
long gethostid(void);

The gethostid() function shall retrieve a 32-bit identifier for the current host.

Upon successful completion, gethostid() shall return an identifier for the current host.

No errors are defined.

The following sections are informative.


This volume of POSIX.1‐2008 does not define the domain in which the return value is unique.




The Base Definitions volume of POSIX.1‐2008, <unistd.h>

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at .

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2013 IEEE/The Open Group