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From: Eric Wong <e@80x24.org>
To: yahns-public@yhbt.net
Subject: [PATCH] worker: workaround old F_SETPIPE_SZ bug
Date: Sat,  4 May 2019 16:34:22 +0000
Message-ID: <20190504163422.19834-1-e@80x24.org> (raw)

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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