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.
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.