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sd_id128_get_boot

SD_ID128_GET_MACHINE(3) 				       sd_id128_get_machine					   SD_ID128_GET_MACHINE(3)

NAME

       sd_id128_get_machine, sd_id128_get_boot - Retrieve 128-bit IDs

SYNOPSIS

       #include <systemd/sd-id128.h>

       int sd_id128_get_machine(sd_id128_t* ret);

       int sd_id128_get_boot(sd_id128_t* ret);

DESCRIPTION

       sd_id128_get_machine() returns the machine ID of the executing host. This reads and parses the machine-id(5) file. This function caches the
       machine ID internally to make retrieving the machine ID a cheap operation.

       sd_id128_get_boot() returns the boot ID of the executing kernel. This reads and parses the /proc/sys/kernel/random/boot_id file exposed by
       the kernel. It is randomly generated early at boot and is unique for every running kernel instance. See random(4) for more information.
       This function also internally caches the returned ID to make this call a cheap operation.

       Note that sd_id128_get_boot() always returns a UUID v4 compatible ID.  sd_id128_get_machine() will also return a UUID v4-compatible ID on
       new installations but might not on older. It is possible to convert the machine ID into a UUID v4-compatible one. For more information, see
       machine-id(5).

       For more information about the "sd_id128_t" type see sd-id128(3).

RETURN VALUE

       The two calls return 0 on success (in which case ret is filled in), or a negative errno-style error code.

NOTES

       The sd_id128_get_machine() and sd_id128_get_boot() interfaces are available as a shared library, which can be compiled and linked to with
       the "libsystemd-id128" pkg-config(1) file.

SEE ALSO

       systemd(1), sd-id128(3), machine-id(5), random(4), sd_id128_randomize(3)

systemd 208														   SD_ID128_GET_MACHINE(3)

Red Hat