_PC_ASYNC_IO 903 ext/etc/constdefs.h #if !defined(_PC_ASYNC_IO) _PC_ASYNC_IO 905 ext/etc/constdefs.h # define _PC_ASYNC_IO _PC_ASYNC_IO _PC_ASYNC_IO 1481 ext/etc/constdefs.h #if defined(_PC_ASYNC_IO) _PC_ASYNC_IO 1482 ext/etc/constdefs.h rb_define_const(mod, "PC_ASYNC_IO", INTEGER2NUM(_PC_ASYNC_IO));