in reply to Call a C function from Perl used from C

One approach (based on universal.c): 

#include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>

XS(XS_Package_sub_name)
{
    ...[ Get arguments from Perl stack ]...

    rv = sub_name(arg);

    ...[ Return values on Perl stack ]...
}

int main() {
    static const char file[] = __FILE__;

    ...

    newXS("Package::sub_name, XS_Package_sub_name, file);

    ...
}

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The following are equivalent: 

newXS("Package::sub_name, XS_Package_sub_name, file);
newXSproto("Package::sub_name, XS_Package_sub_name, file, NULL);
newXS_flags("Package::sub_name, XS_Package_sub_name, file, NULL, 0);

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By taking this approach, you have to do everything XS would do for you manually. You will probably have a simpler time handling the arguments if you went the route of an XS module. If you do create an XS module, see "Using Perl modules, which themselves use C libraries, from your C program" in perlembed for how to load it up.

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Re^2: Call a C function from Perl used from C
by nice (Novice) on Mar 28, 2011 at 21:07 UTC
    Wow, thank you for your reply. Here's a working example:
    #include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>

static PerlInterpreter *my_perl;

void hello ()
{
  printf("Hello, world!\n");
}

XS(XS_main_hello)
{
  dXSARGS;

  if (items != 0)
    croak_xs_usage(cv,  "");

  hello();
    
  XSRETURN_EMPTY;
}

int main (int argc, char **argv, char **env)
{
  static const char file[] = __FILE__;

  PERL_SYS_INIT3(&argc, &argv, &env);
  my_perl = perl_alloc();
  perl_construct(my_perl);
  PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
  perl_parse(my_perl, NULL, argc, argv, (char **)NULL);

  newXS("main::hello", XS_main_hello, file);
  
  perl_run(my_perl);
  perl_destruct(my_perl);
  perl_free(my_perl);
  PERL_SYS_TERM();
  
  return 0;
}

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