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When select() returns with data on one or more file descriptors, we use fread() to read data from the live descriptors. The problem is that these are blocking file descriptors so most of the time bjam is waiting, it's actually waiting in fread(), rather than waiting in select(). There are two possible patches: one is to just call fread() a single time (not inside a loop) or we can make the file descriptors non- blocking. It's more efficient to make the descriptors non-blocking as this allows us to read all data on a descriptor each time select() returns. The first approach would not permit us to read all the data on a descriptor (only as much as fits into our buffer). I tested this patch on Suse, Redhat, and Darwin. [SVN r66650]