---

yaml
---
r: 277638
b: refs/heads/try
c: 61cbd07
h: refs/heads/master

Author: cardoe

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 6dbb0e86aec11050480beb76eade6fb805010ba7
 refs/heads/snap-stage3: 235d77457d80b549dad3ac36d94f235208a1eafb
-refs/heads/try: 121225f17d039e51ea462437189c7c5d229291a8
+refs/heads/try: 61cbd07dec2d9670f170bed44f1815ea29a8a214
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503

branches/try/src/libstd/sys/unix/rand.rs

@@ -66,6 +66,14 @@ mod imp {
                 if err == libc::EINTR {
                     continue;
                 } else if err == libc::EAGAIN {
+                    // if getrandom() returns EAGAIN it would have blocked
+                    // because the non-blocking pool (urandom) has not
+                    // initialized in the kernel yet due to a lack of entropy
+                    // the fallback we do here is to avoid blocking applications
+                    // which could depend on this call without ever knowing
+                    // they do and don't have a work around. The PRNG of
+                    // /dev/urandom will still be used but not over a completely
+                    // full entropy pool
                     let reader = File::open("/dev/urandom").expect("Unable to open /dev/urandom");
                     let mut reader_rng = ReaderRng::new(reader);
                     reader_rng.fill_bytes(& mut v[read..]);