x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_MACHINE_GET_CLASS(3) sd_machine_get_class SD_MACHINE_GET_CLASS(3)
NAME
sd_machine_get_class, sd_machine_get_ifindices - Determine the class
and network interface indices of a locally running virtual machine or
container
SYNOPSIS
#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);
DESCRIPTION
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.
RETURN VALUE
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.
NOTES
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.
SEE ALSO
systemd(1), sd-login(3), systemd-machined.service(8),
sd_pid_get_machine_name(3)
systemd 254 SD_MACHINE_GET_CLASS(3)
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