Request for review: 6749267: Signal handler should save/restore errno

[harold seigel]

Hi,

Please review the following change.

Summary: With this change, the actual signal handler saves the errno 
before calling the function that does most of the signal handling 
processing.  It then restores the value of errno when the signal 
handling processing function returns.

Open webrev: http://cr.openjdk.java.net/~hseigel/bug_6749267/ 
<http://cr.openjdk.java.net/%7Ehseigel/bug_6749267/>

Bug link at: https://jbs.oracle.com/bugs/browse/JDK-6749267

The changes were tested with JPRT, JCK Lang and VM tests, UTE tests, and 
with JPRT.  Also, I used the debugger to change the value of errno 
inside of the signal handling processing method and then verified that 
it got restored properly.

Thanks!  Harold