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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | HISTORY | SEE ALSO | COLOPHON |
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SD_DE..._FIRST(3) sd_device_enumerator_get_device_first SD_DE..._FIRST(3)
sd_device_enumerator_get_device_first,
sd_device_enumerator_get_device_next,
sd_device_enumerator_get_subsystem_first,
sd_device_enumerator_get_subsystem_next - Enumerates devices and
get the first or next device.
#include <systemd/sd-device.h>
sd_device
*sd_device_enumerator_get_device_first(sd_device_enumerator *enumerator);
sd_device
*sd_device_enumerator_get_device_next(sd_device_enumerator *enumerator);
sd_device
*sd_device_enumerator_get_subsystem_first(sd_device_enumerator *enumerator);
sd_device
*sd_device_enumerator_get_subsystem_next(sd_device_enumerator *enumerator);
The sd_device_enumerator_get_device_first() function enumerates
all matching devices under /sys/bus/SUBSYSTEM/devices/ and
/sys/class/SUBSYSTEM/devices/, and returns a pointer to the first
sd_device object. If no devices are found, NULL is returned.
The sd_device_enumerator_get_device_next() function returns the
pointer to the next sd_device from the enumerator. It should be
called after sd_device_enumerator_get_device_first() or after a
previous call to this function. If no more devices are available,
NULL is returned.
The sd_device_enumerator_get_subsystem_first() function enumerates
all matching subsystem devices in /sys/module/, /sys/bus/, and
/sys/bus/SUBSYSTEM/drivers/ (such as /sys/bus/pci/drivers/). It
returns a pointer to the first sd_device object. If no devices are
found NULL is returned. Note that this does not enumerate devices
provided by sd_device_enumerator_get_device_first/next(). Hence,
e.g. /sys/bus/pci/, /sys/bus/pci/drivers/ahci/ and so on are
enumerated, but /sys/bus/pci/devices/0000:00:00.0/ and so on are
not.
The sd_device_enumerator_get_subsystem_next() function returns the
next subsystem device from the enumerator. It should be called
after sd_device_enumerator_get_subsystem_first() or after a
previous call to this function. If no more subsystem devices are
available, NULL is returned.
On success, these functions return a pointer to an sd_device
object. On failure or when no more devices are available, NULL is
returned. The returned pointers are owned by the enumerator and
should not be freed by the caller.
sd_device_enumerator_get_device_first(),
sd_device_enumerator_get_device_next(),
sd_device_enumerator_get_subsystem_first(), and
sd_device_enumerator_get_subsystem_next() were introduced in
systemd version 240.
sd_device_enumerator_new(3),
sd_device_enumerator_add_match_parent(3), sd_device_ref(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 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_DE..._FIRST(3)
Pages that refer to this page: sd_device_enumerator_add_match_parent(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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