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According to "man select" on Linux it is possible that select() lies about data being ready on a pipe in some subtle cases. We deal with this by switching to non-blocking i/o and checking for EAGAIN. See issue #7180.
KWSys provides a platform-independent API to many common system features that are implemented differently on every platform. This library is intended to be shared among many projects, so it has a configurable namespace. Each project should configure KWSys to use a namespace unique to itself. See comments in CMakeLists.txt for details. You are probably reading this file in the source tree of a surrounding project. In that case, see "../README.kwsys" for details of using KWSys in your project.