SD_HWDB_NEW(3) sd_hwdb_new SD_HWDB_NEW(3)
sd_hwdb_new, sd_hwdb_ref, sd_hwdb_unref - Create a new hwdb object and create or destroy references to it
#include <systemd/sd-hwdb.h> int sd_hwdb_new(sd_hwdb **hwdb); sd_hwdb* sd_hwdb_ref(sd_hwdb *hwdb); sd_hwdb* sd_hwdb_unref(sd_hwdb *hwdb);
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. 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. 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.
These APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd pkg-config(1) file.
systemd(1), systemd-udev.service(8), sd-hwdb(3), systemd-hwdb(3)
This page is part of the systemd (systemd system and service manager) project. Information about the project can be found at ⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug report for this manual page, see ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This page was obtained from the project's upstream Git repository ⟨https://github.com/systemd/systemd.git⟩ on 2020-06-09. (At that time, the date of the most recent commit that was found in the repos‐ itory was 2020-06-09.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com systemd 245 SD_HWDB_NEW(3)
Pages that refer to this page: sd-hwdb(3), sd_hwdb_enumerate(3), sd_hwdb_foreach_property(3), SD_HWDB_FOREACH_PROPERTY(3), sd_hwdb_get(3), sd_hwdb_seek(3), 30-systemd-environment-d-generator(7), systemd.directives(7), systemd.index(7)