Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

That sounds like a good idea.

$ ./reverse
var is narf!
Segmentation fault

Eh?

cat reverse.c

#include <EXTERN.h> #include <perl.h> static PerlInterpreter *my_perl; static SV * do_reverse(x) SV *x; { dSP; int count; SV *var; ENTER; SAVETMPS; PUSHMARK(SP); XPUSHs(sv_mortalcopy(x)); PUTBACK; count = perl_call_pv("CORE::reverse", G_SCALAR); SPAGAIN; if (count != 1) croak("Aieee!"); var = POPs; PUTBACK; FREETMPS; LEAVE; } main (int argc, char **argv, char **env) { STRLEN len; SV *var; my_perl = perl_alloc(); perl_construct(my_perl); var = newSVpvf("%s", "narf!"); printf("var is %s\n", SvPV(var, len)); var = do_reverse(sv_2mortal(var)); printf("var is %s\n", SvPV(var, len)); perl_destruct(my_perl); perl_free(my_perl); }

According to gdb, it's segfaulting on the perl_call_pv. What am I doing wrong?

(Running perl, v5.6.1, built for i686-linux-multi.)


In reply to Re: Re: Embedding Perl in C -- access to builtins? by premchai21
in thread Embedding Perl in C -- access to builtins? by premchai21

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others taking refuge in the Monastery: (4)
    As of 2014-11-28 00:44 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My preferred Perl binaries come from:














      Results (191 votes), past polls