Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

crypto/rand: handle EAGAIN reads from /dev/urandom

Browse source 
Fixes #9205

Change-Id: Iacd608ba43332008984aa8ece17dcb5757f27b3f
Reviewed-on: https://go-review.googlesource.com/1611
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Brad Fitzpatrick 2014-12-16 15:11:43 +11:00
parent 8655f04d8e
commit 5308c6d932
2 changed files with 44 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

18
src/crypto/rand/rand_unix.go
View file

@ -58,12 +58,28 @@ func (r *devReader) Read(b []byte) (n int, err error) {
if runtime.GOOS == "plan9" {
r.f = f
} else {
r.f = bufio.NewReader(f)
r.f = bufio.NewReader(hideAgainReader{f})
}
}
return r.f.Read(b)
}
var isEAGAIN func(error) bool // set by eagain.go on unix systems
// hideAgainReader masks EAGAIN reads from /dev/urandom.
// See golang.org/issue/9205
type hideAgainReader struct {
r io.Reader
}
func (hr hideAgainReader) Read(p []byte) (n int, err error) {
n, err = hr.r.Read(p)
if err != nil && isEAGAIN != nil && isEAGAIN(err) {
err = nil
}
return
}
// Alternate pseudo-random implementation for use on
// systems without a reliable /dev/urandom.