Linux has documented but somewhat unusual behavior around
SIGSTOP/SIGCONT and certain syscalls, of which epoll_wait(2) is one. In
this particular case, rngd exited unexpectedly after getting ptrace'd
mid-epoll_wait. Fix this by handling EINTR from this syscall, and
continuing to add entropy and wait.
Signed-off-by: Krister Johansen <krister.johansen@oracle.com>
Epoll in `syscall` package does not work on arm64. We do not have
arm64 yet here, but we will when we add tpm support etc.
Signed-off-by: Justin Cormack <justin@specialbusservice.com>
Only supports the use cases we currently need, currently support
for using Intel hardware rng to initialise and add entropy.
Supports oneshot and service mode. Call as `rngd -1` for one shot
mode.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
