x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_ID128_RANDOMIZE(3) sd_id128_randomize SD_ID128_RANDOMIZE(3)
NAME
sd_id128_randomize - Generate 128-bit IDs
SYNOPSIS
#include <systemd/sd-id128.h>
int sd_id128_randomize(sd_id128_t *ret);
DESCRIPTION
sd_id128_randomize() generates a new randomized 128-bit ID and returns
it in ret. Every invocation returns a new randomly generated ID. This
uses the getrandom(2) kernel random number generator.
Note that sd_id128_randomize() always returns a UUID Variant 1 Version
4 compatible ID. It is hence guaranteed that this function will never
return the ID consisting of all zero or all one bits (SD_ID128_NULL,
SD_ID128_ALLF).
For more information about the "sd_id128_t" type, see sd-id128(3).
systemd-id128(1)'s new command may be used as a command line front-end
for sd_id128_randomize().
RETURN VALUE
The call returns 0 on success (in which case ret is filled in), or a
negative errno-style error code.
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-id128(3), machine-id(5), getrandom(2), random(4),
sd_id128_get_machine(3)
systemd 254 SD_ID128_RANDOMIZE(3)
Want to link to this manual page? Use this URL:
<http://star2.abcm.com/cgi-bin/bsdi-man?query=sd_id128_randomize&sektion=3&manpath=>