* [PATCH] worker: workaround old F_SETPIPE_SZ bug
@ 2019-05-04 16:34 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2019-05-04 16:34 UTC (permalink / raw)
To: yahns-public
Linux before 4.9 (and before 3.16.57) failed to account
for the existing size of a pipe before checking system
resource limits and would return EPERM in that case.
https://80x24.org/mirrors/linux.git/commit?id=b0b91d18e2e97b741b294af9333824ecc3fadfd8
https://lore.kernel.org/lkml/?q=s%3A%22fix+limit+checking+in+pipe_set_size%22
Based on a patch by Stephen Demjanenko for unicorn:
https://bogomips.org/unicorn-public/1556922018-24096-1-git-send-email-sdemjanenko@gmail.com/
---
lib/yahns/worker.rb | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/yahns/worker.rb b/lib/yahns/worker.rb
index 0355629..ec5be23 100644
--- a/lib/yahns/worker.rb
+++ b/lib/yahns/worker.rb
@@ -14,8 +14,8 @@ def initialize(nr)
# F_SETPIPE_SZ = 1031, PAGE_SIZE = 4096
# (fcntl will handle minimum size on platforms where PAGE_SIZE > 4096)
@to_io.fcntl(1031, 4096)
- rescue Errno::EINVAL
- # old kernel
+ rescue SystemCallError
+ # old kernel (EINVAL, EPERM)
end if RUBY_PLATFORM =~ /\blinux\b/
end
--
EW
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2019-05-04 16:34 [PATCH] worker: workaround old F_SETPIPE_SZ bug Eric Wong
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