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Re^2: Some functions in .xs file can't be found

by ikegami (Pope)
on Nov 13, 2013 at 15:05 UTC ( #1062399=note: print w/replies, xml ) Need Help??

in reply to Re: Some functions in .xs file can't be found
in thread Some functions in .xs file can't be found

No, it should be void. The C function doesn't return anything.

#define XSRETURN(off) \ STMT_START { \ const IV tmpXSoff = (off); \ PL_stack_sp = PL_stack_base + ax + (tmpXSoff - 1); \ return; \ } STMT_END

There are two ways of returning to Perl from an XS function:

  • Place it on the Perl stack.
    void foo() { ... mXPUSHs(sv); }
  • Return it from the C function. The typemap will place it on the Perl stack after any conversion and mortalizing it performs.
    SV* foo() { ... return sv; }

The OP's code uses the former approach.

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Re^3: Some functions in .xs file can't be found
by BrowserUk (Pope) on Nov 13, 2013 at 16:59 UTC

    Indeed. Thanks for the correction.

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

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