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libbb: code shrink

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function                                             old     new   delta
generate_uuid                                        124     103     -21

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-11-29 14:24:14 +01:00
parent 6a55b4e403
commit eb773054e4
1 changed files with 3 additions and 6 deletions
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9
libbb/xfuncs_printf.c
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@ -633,14 +633,11 @@ void FAST_FUNC generate_uuid(uint8_t *buf)
pid_t pid;
int i;
i = open("/dev/urandom", O_RDONLY);
if (i >= 0) {
read(i, buf, 16);
close(i);
}
open_read_close("/dev/urandom", buf, 16);
/* Paranoia. /dev/urandom may be missing.
* rand() is guaranteed to generate at least [0, 2^15) range,
* but lowest bits in some libc are not so "random". */
* but lowest bits in some libc are not so "random".
*/
srand(monotonic_us()); /* pulls in printf */
pid = getpid();
while (1) {