sd_hwdb_new, sd_hwdb_ref, sd_hwdb_unref - Create a new hwdb object and create or
destroy references to it
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
The hwdb object is reference counted. sd_hwdb_ref()
and 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_new() by calling sd_hwdb_unref() when
done with the object.
Use sd_hwdb_seek(3), sd_hwdb_get(3), and
sd_hwdb_enumerate(3) to access entries.
On success, sd_hwdb_new() returns a non-negative integer. On failure, it
returns a negative errno-style error code.
sd_hwdb_ref() always returns the argument.
sd_hwdb_unref() always returns NULL.
Returned errors may indicate the following problems:
The binary hardware database file could not be located.
for more information.
The located binary hardware database file is in an
Memory allocation failed.
These APIs are implemented as a shared library, which can be compiled and linked
to with the libsystemd pkg-config(1) file.