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- This patch fixes the handle leak which occurs when exec() fails with an error. The duplicated handles will be closed when the exec'ed process is terminated. However, if exec() fails, the code path does not reach to the code closing the duplicated handles. To implement this fix more appropriately, the setup, cleanup and closing pty codes which was previously located in spawn.cc are encapsulated into the fhandler_pty_slave class functions.
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