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The function
attempts to create a unique key suitable for use with the and functions
given the of an existing file and a user-selectable The specified must
specify an existing file that is accessible to the calling process or the
call will fail. Also, note that links to files will return the same key,
given the same
The function will return -1 if does not exist
or if it cannot be accessed by the calling process.
The
function originate with System V and is typically used by programs that
use the System V IPC routines.
Thorsten Lockert <tholo@sigmasoft.com>
The returned key is computed based on the device and inode of the
specified in combination with the given Thus is is quite possible for
the routine to return duplicate keys given that those fields are not 8-
and 16-bit quantities like they were on System V based systems where this
library routine’s ancestor were originally created.
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