NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON
SD_HWDB_NEW(3) sd_hwdb_new SD_HWDB_NEW(3)
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
#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);
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.
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.
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-udevd.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 2022-12-17. (At that time, the date of the most recent commit that was found in the repository was 2022-12-16.) 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 firstname.lastname@example.org systemd 252 SD_HWDB_NEW(3)
Pages that refer to this page: sd-hwdb(3), sd_hwdb_get(3), systemd.directives(7), systemd.index(7)