Another sigwaitinfo problem (with testcase)

Daniel Colascione
Fri Aug 17 07:18:00 GMT 2012

On 8/16/2012 8:51 PM, Daniel Colascione wrote:
> On 8/16/2012 11:43 AM, Christopher Faylor wrote:
>> On Tue, Aug 14, 2012 at 10:36:39PM -0700, Daniel Colascione wrote:
>>> When run on a Linux machine, this program starts up and blocks on sigwaitinfo.
>>> You can suspend and resume the program using usual job control facilities, and
>>> on SIGINT, the program prints a message and exits. When the program resumes
>>> after being stopped, it prints "resumed".
>>> With the 2012-08-07 Cygwin snapshot, this program prints "resumed" immediately
>>> after receiving SIGTSTP, then fails to respond to any signal, even signals not
>>> in the blocked set. A simpler test program that just calls "raise (SIGSTOP)"
>>> property stops itself before resuming execution.
>> This should be fixed in the latest snapshot.
>> Thanks for the test case.
> Thanks for the fix. It's incomplete, though. Previously, C-z would make the
> program print "resumed", then become insensitive the signals present in
> waitmask. With the 2012-08-16 snapshot, C-z stops the program, but on
> resumption, it doesn't print "resumed". Instead, on resumption, the program
> enters the same signal-insensitive state it did with the 2012-08-07 snapshot.

More odd behavior under the 2012-08-16 snapshot:

1) Start vim
2) Hit C-z
3) Run "fg"
4) Observe that vim doesn't reappear. Rather, nothing happens, until...
5) C-c
6) vim now redisplays and accepts input

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