Hi Alex On 26/12/2022 22:29, Alejandro Colomar wrote: > Hi Jonny, > > On 12/26/22 22:50, Jonny Grant wrote: >> Hi Alejandro > > Please send also to my email. > >> Please find below a patch. >> >> 2022-12-26 Jonathan Grant <jg@xxxxxxxx> >> * man3/rand.3: Add example to rand.3 seed with time(NULL) >> >> >> From 2d4501354ea6c465173fe6c089dfbcc80393a644 Mon Sep 17 00:00:00 2001 >> From: Jonathan Grant <jg@xxxxxxxx> >> Date: Mon, 26 Dec 2022 21:48:17 +0000 >> Subject: [PATCH] add rand.3 example >> >> Signed-off-by: Jonathan Grant <jg@xxxxxxxx> > > time(NULL) is not too good. If you call it several times per second, you'll find that it only changes the seed every second. There are better ways to produce a good seed. > > However, I prefer suggesting arc4random() rather than workarounding rand(3) to get good results. > > Florian, did you already merge arc4random() to glibc? Hopefully arc4random will come soon. Maybe rand.3 could then be updated to SEE ALSO that. I would only mention to call srand once to seed, but you're right there are lots of other ways to get a seed. Jonny
