[Bug 48027] New: cmd pipe | not triggering ReadFile EOF

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48027

Bug ID: 48027
           Summary: cmd pipe | not triggering ReadFile EOF
           Product: Wine
           Version: 4.18
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: cmd
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Test program is find.exe as of wine commit
ccec532879ec14b2e79da08288152a69221ec4d1.

I implemented the program so it waits for ReadFile to return FALSE, that's when
the input is supposed to be over:
######
BOOL success = ReadFile(handle, buffer, 4096, &buffer_max, NULL);
if (!success)
    return FALSE;
######

Now that's not right anyways, but it exposes a slight difference in Wine cmd:

1) Following input hangs on Wine, but not on Windows: "echo test | find test"
   It works on Wine when using "winetricks -q cmd"

2) Following input hangs on both Windows and Wine: "find test < test.txt"

Wine's implementation of the pipe | uses the redirect operator < internally.
This leads to the pipe working differently on Wine, i.e. blocking ReadFile when
it's not supposed to.

I'm not aware of a real program being affected by that, just noting.