MSG_SYN           661 ext/socket/constdefs.c #if defined(MSG_SYN)
MSG_SYN           663 ext/socket/constdefs.c     rb_define_const(rb_cSocket, "MSG_SYN", INTEGER2NUM(MSG_SYN));
MSG_SYN           665 ext/socket/constdefs.c     rb_define_const(rb_mSockConst, "MSG_SYN", INTEGER2NUM(MSG_SYN));
MSG_SYN           512 ext/socket/constdefs.h #if !defined(MSG_SYN)
MSG_SYN           514 ext/socket/constdefs.h #  define MSG_SYN MSG_SYN