The O_NONBLOCK flag has been ignored since Linux 5.6 and this patch
states this change in man page.
The commit that introduce this change in the Linux kernel is
30c08efec888 ("random: make /dev/random be almost like /dev/urandom")
Signed-off-by: GUO Zihua <guozihua@xxxxxxxxxx>
Reviewed-by: Petr Vorel <pvorel@xxxxxxx>
---
v3:
-Replaced "removed" with "ignored" as suggested by Florian. Added
Reviewed-by by Petr
v2:
-Fix formating issue.
---
man4/random.4 | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/man4/random.4 b/man4/random.4
index bea860e7f0d7..3227a483d4a9 100644
--- a/man4/random.4
+++ b/man4/random.4
@@ -68,7 +68,12 @@ high quality randomness, and can afford indeterminate delays.
.PP
When the entropy pool is empty, reads from \fI/dev/random\fP will block
until additional environmental noise is gathered.
-If
+Since Linux 5.6, the
+.B O_NONBLOCK
+flag is ignored as
+.I /dev/random
+will no longer block except during early boot process.
+In eariler versions, if
.BR open (2)
is called for
.I /dev/random
--
2.36.0
