RFR 8203369 : Check for both EAGAIN and EWOULDBLOCK error codes

[Alan Bateman]

On 24/05/2018 21:57, Ivan Gerasimov wrote:
> Hello!
>
> On Unix systems several system calls (including pread, read, readv, 
> recvfrom, recvmsg, send, sendfile, sendmsg, sendto) may set errno to 
> either EAGAIN or EWOULDBLOCK on the same condition.
>
> On Linux these two constants are the same, but they are not required 
> to be the same.
>
> For example, here's an extract from the Linux man page of send():
> EAGAIN or EWOULDBLOCK
> The  socket  is marked nonblocking and the requested operation would 
> block.  POSIX.1-2001 allows either error to be returned for this case, 
> and does not require these constants to have the same value, so a 
> portable application should check for both possibilities.
>
> We should check for both error codes when appropriate.
>
> Would you please help review the fix?
>
> BUGURL: https://bugs.openjdk.java.net/browse/JDK-8203369
> WEBREV: http://cr.openjdk.java.net/~igerasim/8203369/00/webrev/
The changes in 01/webrev look okay to me but I'm curious if there are 
any ports in OpenJDK where the values are different. If they are 
different then I would assume that many tests will fail.

-Alan