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GETHOSTID(3) Library Functions Manual GETHOSTID(3)

NAME

gethostid, sethostidget/set unique identifier of current host

SYNOPSIS

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

DESCRIPTION

The sethostid() function establishes a 32-bit identifier for the current processor that is intended to be unique among all UNIX systems in existence. This is normally a DARPA Internet address for the local machine. This call is allowed only to the superuser and is normally performed at boot-time.
gethostid() 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(2).

SEE ALSO

gethostname(3), sysctl(2), sysctl(8)

HISTORY

The gethostid() and sethostid() system calls first appeared in 4.1cBSD and were dropped in 4.4BSD.

BUGS

32 bits for the identifier is too small.
January 12, 2018 OpenBSD-current