sd_hwdb_new, sd_hwdb_new_from_path, sd_hwdb_ref, sd_hwdb_unref — Create a new hwdb object and create or destroy references to it
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sd_hwdb_new() creates a new hwdb object to access the binary hwdb
database. Upon initialization, the file containing the binary representation of the hardware database is
located and opened. The new object is returned in
sd_hwdb_new_from_path() may be used to specify the path from which the binary
hardware database should be opened.
hwdb object is reference counted.
sd_hwdb_unref() may be used to get a new reference or destroy an existing reference
to an object. The caller must dispose of the reference acquired with
sd_hwdb_unref() when done with the object.
return a non-negative integer. On failure, a negative errno-style error code is returned.
sd_hwdb_ref() always returns the argument.
sd_hwdb_unref() always returns
Returned errors may indicate the following problems:
Functions described here are available as a shared
library, which can be compiled against and linked to with the
The code described here uses
which is declared to be not multi-thread-safe. This means that the code calling the functions described
here must not call
from a parallel thread. It is recommended to only do calls to
from an early phase of the program when no other threads have been started.
sd_hwdb_unref() were added in version 246.
sd_hwdb_new_from_path() was added in version 252.