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Rollup merge of #66092 - niacat:master, r=nagisa

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Use KERN_ARND syscall for random numbers on NetBSD, same as FreeBSD.

This system call is present on all supported NetBSD versions and provides an endless stream of non-blocking random data from the kernel's ChaCha20-based CSPRNG. It doesn't require a file like `/dev/urandom` to be opened.

The system call is documented here (under kern.arandom):
https://netbsd.gw.com/cgi-bin/man-cgi?sysctl+7+NetBSD-7.0

And defined here:
https://nxr.netbsd.org/xref/src/sys/sys/sysctl.h#273

The semantics are the same as FreeBSD so reading 256 bytes per call is fine.

Similar change for getrandom crate: rust-random/getrandom#115
This commit is contained in:
Mazdak Farrokhzad 2019-11-06 07:03:09 +01:00 committed by GitHub
commit 828a3eef66
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1 changed files with 2 additions and 1 deletions
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src/libstd/sys/unix/rand.rs
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@ -15,6 +15,7 @@ pub fn hashmap_random_keys() -> (u64, u64) {
not(target_os = "ios"),
not(target_os = "openbsd"),
not(target_os = "freebsd"),
not(target_os = "netbsd"),
not(target_os = "fuchsia"),
not(target_os = "redox")))]
mod imp {
@ -142,7 +143,7 @@ mod imp {
}
}
#[cfg(target_os = "freebsd")]
#[cfg(any(target_os = "freebsd", target_os = "netbsd"))]
mod imp {
use crate::ptr;