I fixed the compilation errors. But like I said, it would make more sense to actually call print: 
package MyModule;

use Inline Config => (
    DIRECTORY => './Inline',
);

use Inline 'C';

sub _fprint { print { shift } @_ }

# ...

1;

__END__
__C__


int my_print(SV* fh, SV* sv) {
    int result;

    dSP;

    ENTER;
    SAVETMPS;

    PUSHMARK(SP);
    XPUSHs(fh);
    XPUSHs(sv);
    PUTBACK;

    call_pv("MyModule::_fprint", G_SCALAR);

    SPAGAIN;
    result = POPi;
    PUTBACK;

    FREETMPS;
    LEAVE;

    return result;
}

[download]

In reply to Re^3: Inline C + IO::Handle by ikegami
in thread FCGI + Inline::C fast stream out! by mrakus

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