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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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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-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 2021-08-27. (At that
time, the date of the most recent commit that was found in the
repository was 2021-08-27.) 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 249 SD_HWDB_NEW(3)
Pages that refer to this page: sd-hwdb(3), sd_hwdb_get(3)
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