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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_MACHINE_GET_CLASS(3) sd_machine_get_class SD_MACHINE_GET_CLASS(3)
sd_machine_get_class, sd_machine_get_ifindices - Determine the
class and network interface indices of a locally running virtual
machine or container
#include <systemd/sd-login.h>
int sd_machine_get_class(const char* machine, char **class);
int sd_machine_get_ifindices(const char* machine,
int **ret_ifindices);
sd_machine_get_class() may be used to determine the class of a
locally running virtual machine or container that is registered
with systemd-machined.service(8). The string returned is either
"vm" or "container". The returned string needs to be freed with
the libc free(3) call after use.
sd_machine_get_ifindices() may be used to determine the numeric
indices of the network interfaces on the host that are pointing
towards the specified locally running virtual machine or
container. The vm or container must be registered with
systemd-machined.service(8). The output parameter ret_ifindices
may be passed as NULL when the output value is not needed. The
returned array needs to be freed with the libc free(3) call after
use.
On success, these functions return a non-negative integer.
sd_machine_get_ifindices() returns the number of the relevant
network interfaces. On failure, these calls return a negative
errno-style error code.
Errors
Returned errors may indicate the following problems:
-ENXIO
The specified machine does not exist or is currently not
running.
-EINVAL
An input parameter was invalid (out of range, or NULL, where
that is not accepted).
-ENOMEM
Memory allocation failed.
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_machine_get_class() and sd_machine_get_ifindices() were added
in version 217.
systemd(1), sd-login(3), systemd-machined.service(8),
sd_pid_get_machine_name(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
[email protected]
systemd 258~rc2 SD_MACHINE_GET_CLASS(3)
Pages that refer to this page: 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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