pcc/ninja — comment on commit ff9cc51b9e52f7ae8c3de0ea1cc3df2123e78553
File: src/subprocess.cc line 187
By pcc:

I'll add a test that any fd we might use to build the pselect set falls below FD_SETSIZE, and if not, we fatally error out. (Ugly, but better than invoking undefined behaviour.)

In the long term we may consider adding support for ppoll or other OS specific functionality.