[PATCH] Start the server if another user has a PID matching our stale pidfile.

Graham Bleach graham at darkskills.org.uk
Wed Feb 29 14:34:44 UTC 2012

If unicorn doesn't get terminated cleanly (for example if the machine
has its power interrupted) and the pid in the pidfile gets used by
another process, the current unicorn code will exit and not start a
server. This tiny patch fixes that behaviour.

 lib/unicorn/http_server.rb |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/unicorn/http_server.rb b/lib/unicorn/http_server.rb
index 7d2c623..0c2af5d 100644
--- a/lib/unicorn/http_server.rb
+++ b/lib/unicorn/http_server.rb
@@ -656,7 +656,7 @@ class Unicorn::HttpServer
     wpid <= 0 and return
     Process.kill(0, wpid)
-    rescue Errno::ESRCH, Errno::ENOENT
+    rescue Errno::ESRCH, Errno::ENOENT, Errno::EPERM
       # don't unlink stale pid files, racy without non-portable locking...


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