diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/std/sysrand.nim | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/std/sysrand.nim b/lib/std/sysrand.nim index 75983e3c6..b35f24a72 100644 --- a/lib/std/sysrand.nim +++ b/lib/std/sysrand.nim @@ -38,6 +38,11 @@ ## .. _randomFillSync: https://nodejs.org/api/crypto.html#crypto_crypto_randomfillsync_buffer_offset_size ## .. _/dev/urandom: https://en.wikipedia.org/wiki//dev/random ## +## On a Linux target, a call to the `getrandom` syscall can be avoided (e.g. +## for targets running kernel version < 3.17) by passing a compile flag of +## `-d:nimNoGetRandom`. If this flag is passed, sysrand will use `/dev/urandom` +## as with any other POSIX compliant OS. +## runnableExamples: doAssert urandom(0).len == 0 @@ -159,7 +164,7 @@ elif defined(windows): result = randomBytes(addr dest[0], size) -elif defined(linux): +elif defined(linux) and not defined(nimNoGetRandom): # TODO using let, pending bootstrap >= 1.4.0 var SYS_getrandom {.importc: "SYS_getrandom", header: "<sys/syscall.h>".}: clong const syscallHeader = """#include <unistd.h> |