NAME

       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

SYNOPSIS

       #include <systemd/sd-hwdb.h>

       int sd_hwdb_new(sd_hwdb **hwdb);

       int sd_hwdb_new_from_path(const char *path, sd_hwdb **hwdb);

       sd_hwdb* sd_hwdb_ref(sd_hwdb *hwdb);

       sd_hwdb* sd_hwdb_unref(sd_hwdb *hwdb);

DESCRIPTION

       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 hwdb.

       sd_hwdb_new_from_path() may be used to specify the path from which the binary hardware database should be
       opened.

       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.

RETURN VALUE

       On success, sd_hwdb_new() and sd_hwdb_new_from_path() 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 NULL.

   Errors
       Returned errors may indicate the following problems:

       -ENOENT
           The binary hardware database file could not be located. See systemd-hwdb(8) for more information.

       -EINVAL
           The located binary hardware database file is in an incompatible format.

       -ENOMEM
           Memory allocation failed.

NOTES

       These APIs are implemented as a shared library, which can be compiled and linked to with the
       libsystemd pkg-config(1) file.

SEE ALSO

       systemd(1), systemd-udevd.service(8), sd-hwdb(3), systemd-hwdb(3)