PERL_CALLCONV STRLEN Perl_sv_utf8_upgrade_flags(pTHX_ SV *sv, I32 flags);
PERL_CALLCONV char* Perl_sv_pvn_force_flags(pTHX_ SV* sv, STRLEN* lp, I32 flags);
PERL_CALLCONV char* Perl_sv_2pv_flags(pTHX_ SV* sv, STRLEN* lp, I32 flags);
+PERL_CALLCONV void Perl_sv_copypv(pTHX_ SV* dsv, SV* ssv);
PERL_CALLCONV char* Perl_my_atof2(pTHX_ const char *s, NV* value);
PERL_CALLCONV int Perl_my_socketpair(int family, int type, int protocol, int fd[2]);