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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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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.
Added in version 246.
-EINVAL
The located binary hardware database file is in an
incompatible format.
Added in version 246.
-ENOMEM
Memory allocation failed.
Added in version 246.
Functions described here are available as a shared library, which
can be compiled against and linked to with the
libsystemd pkg-config(1) file.
The code described here uses getenv(3), which is declared to be
not multi-thread-safe. This means that the code calling the
functions described here must not call setenv(3) from a parallel
thread. It is recommended to only do calls to setenv() from an
early phase of the program when no other threads have been
started.
sd_hwdb_new(), sd_hwdb_ref(), and sd_hwdb_unref() were added in
version 246.
sd_hwdb_new_from_path() was added in version 252.
systemd(1), systemd-udevd.service(8), sd-hwdb(3), systemd-hwdb(8)
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 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-11.) 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
man-pages@man7.org
systemd 258~rc2 SD_HWDB_NEW(3)
Pages that refer to this page: sd-hwdb(3), sd_hwdb_get(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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