https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67578
Bug ID: 67578 Summary: std::random_device::entropy() always returns 0 Product: gcc Version: 5.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: redi at gcc dot gnu.org Target Milestone: --- When using /dev/random or /dev/urandom on GNU/Linux we can get the bits of available entropy using the RNDGETENTCNT ioctl.