[Webkit-unassigned] [Bug 151135] New: [XvfbDriver] Fail to run all layout tests when X server started with -displayfd option

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151135

            Bug ID: 151135
           Summary: [XvfbDriver] Fail to run all layout tests when X
                    server started with -displayfd option
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: lforschler at apple.com

Since my last debian update my xserver no longer uses the :<display-id> option, but -displayfd. The XvfbDriver uses the x server command line to check the displayas that are currently in use. This doesn't work when x server was satarted with -displayfd. This option is used to let the server find the display id available and it's written to the given file descriptor. With this option xord doesn't need to create the lock files in tmp either. The -displayfd option is also available in XVfb, so we could use it too when available. That would simplify the code, fixing also race conditions between we check for available displays and XVfb opens the connection, we wouldn't need to wait for 4 seconds after launching XVfb, and all lock files we are using won't be needed either.

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