const char *mode,
int fd, int imode, int perm,
PerlIO *old, int narg, SV **args);
+ IV (*Binmode)(pTHX_ PerlIO *f);
SV *(*Getarg) (pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags);
IV (*Fileno) (pTHX_ PerlIO *f);
PerlIO *(*Dup) (pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags);
extern PerlIO *PerlIOBase_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags);
extern IV PerlIOBase_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg);
extern IV PerlIOBase_popped(pTHX_ PerlIO *f);
+extern IV PerlIOBase_binmode(pTHX_ PerlIO *f);
extern SSize_t PerlIOBase_read(pTHX_ PerlIO *f, void *vbuf, Size_t count);
extern SSize_t PerlIOBase_unread(pTHX_ PerlIO *f, const void *vbuf,
Size_t count);