GetRandom calls the getrandom system call.

KernelVersion returns major and minor kernel version numbers, parsed from the syscall.Uname's Release field, or 0, 0 if the version can't be obtained or parsed.

go:linkname RecvfromInet4 syscall.recvfromInet4go:noescape.

go:linkname RecvfromInet6 syscall.recvfromInet6go:noescape.

go:linkname RecvmsgInet4 syscall.recvmsgInet4go:noescape.

go:linkname RecvmsgInet6 syscall.recvmsgInet6go:noescape.

go:linkname SendmsgNInet4 syscall.sendmsgNInet4go:noescape.

go:linkname SendmsgNInet6 syscall.sendmsgNInet6go:noescape.

go:linkname SendtoInet4 syscall.sendtoInet4go:noescape.

go:linkname SendtoInet6 syscall.sendtoInet6go:noescape.

GRND_NONBLOCK means return EAGAIN rather than blocking.

GRND_RANDOM means use the /dev/random pool instead of /dev/urandom.

GetRandomFlag is a flag supported by the getrandom system call.