Linus Torvalds wrote:
On Mon, 17 Dec 2007, Arjan van de Ven wrote:
+char *get_boot_uuid(void)
+{
+ static char target[38];
+ unsigned char *uuid;
+
+ if (sysctl_bootid[8] == 0)
+ generate_random_uuid(sysctl_bootid);
+ /* sysctl_bootid is signed, to print we need unsigned .. */
+ uuid = sysctl_bootid;
+
+ if (target[0] == 0) {
+ sprintf(target, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
+ "%02x%02x%02x%02x%02x%02x",
Why isn't *everything* inside that "if (target[0] == 0" check?
the sysctl_bootid is shared with the /proc exposed bootid, so I need to generate it the same way
I'd _also_ suggest that you'd actually try to avoid that horrid sequence
of "%02x..", and instead just make sure that sysctl_bootid[] is 4-byte
aligned, and then you can do
sprintf("%08x-%04x-%04x-%04x-%04x%08x",
ntohl(0[(u32 *)uuid]),
ntohs(2[(u16 *)uuid]),
ntohs(3[(u16 *)uuid]),
ntohs(4[(u16 *)uuid]),
ntohs(5[(u16 *)uuid]),
ntohl(3[(u32 *)uuid]));
which also gets bonus points for being totally unreadable, and thus 100%
in the spirit of uuid's.
again.. this is for compatibility with /proc/sys/kernel/random/boot_id .. the code 10 lines below my patch is identical and does
the %02x stuff... I didn't make that up, I just copied that to get the same output.
I can deviate for cleanup... but I can see some value of being the same format and same data.
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