[ruby-core:62840] [ruby-trunk - Bug #9878] ruby_signal() should return either sa_sigaction or sa_handler, depending on SA_SIGINFO

Issue #9878 has been updated by Nobuyoshi Nakada.

Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN to 2.0.0: REQUIRED, 2.1: REQUIRED

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Bug #9878: ruby_signal() should return either sa_sigaction or sa_handler, depending on SA_SIGINFO
https://bugs.ruby-lang.org/issues/9878#change-46960

* Author: Rei Odaira
* Status: Closed
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: ruby 2.2.0dev (2014-05-29 trunk 46222) [x86_64-linux]
* Backport: 2.0.0: REQUIRED, 2.1: REQUIRED
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`ruby_signal()` in signal.c returns `old.sa_handler`,
but it should return either `old.sa_sigaction` or `old.sa_handler`,
depending on whether `SA_SIGINFO` is set in `old.sa_flags`.

~~~diff
--- signal.c    (revision 46222)
+++ signal.c    (working copy)
@@ -595,7 +595,10 @@
            rb_bug_errno("sigaction", errno);
        }
     }
-    return old.sa_handler;
+    if (old.sa_flags & SA_SIGINFO)
+       return (sighandler_t)old.sa_sigaction;
+    else
+       return old.sa_handler;
 }
 
 sighandler_t
~~~

The original code happens to be correct on the environments
where `sa_handler` and `sa_sigaction` are union, but it is not
guaranteed in general.

(Actually, they are not union on z/OS.)



-- 
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