_SC_SYNCHRONIZED_IO  263 ext/etc/constdefs.h #if !defined(_SC_SYNCHRONIZED_IO)
_SC_SYNCHRONIZED_IO  265 ext/etc/constdefs.h #  define _SC_SYNCHRONIZED_IO _SC_SYNCHRONIZED_IO
_SC_SYNCHRONIZED_IO 1097 ext/etc/constdefs.h #if defined(_SC_SYNCHRONIZED_IO)
_SC_SYNCHRONIZED_IO 1098 ext/etc/constdefs.h     rb_define_const(mod, "SC_SYNCHRONIZED_IO", INTEGER2NUM(_SC_SYNCHRONIZED_IO));