On 7/6/2022 11:57 AM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via Cygwin wrote: >> However, discussing this shows how irrelevant the actual default value >> of FD_SETSIZE is. > > Correct, yet the comments in the header files (along with used values) should be consistent :-) I'll make the changes that Corinna suggested. They'll take effect starting with Cygwin 3.4.0. Ken