embedding, 'require' and extensions

[Phil Tomson]

I've basically taken the embedding example from pickaxeII and the only
thing I've added is for the Ruby program to do a 'require' of a file known
to exist in the library.

Here is the relevant part of the C-side code:
//summer.c
int main(void) {
int value;
int* next = Values;

ruby_init();
ruby_init_loadpath();
ruby_script("embedded");
rb_require("sum.rb"); //ruby script is sum.rb

ruby_finalize();
exit(0);
}
//end of summer.c

So the ruby_init_loadpath() should be setting up the loadpath correctly,
and I can confirm this by making the ruby script to be required (sum.rb)
like so:

#sum.rb
puts $:

Now if I run summer, I get:
$ ./summer
/usr/local/lib/ruby/site_ruby/1.8
/usr/local/lib/ruby/site_ruby/1.8/i686-linux
/usr/local/lib/ruby/site_ruby
/usr/local/lib/ruby/1.8
/usr/local/lib/ruby/1.8/i686-linux

 

[ts]

P> Here is the relevant part of the C-side code:

You don't give the most important part : how do you build your
executable ?

You must use the value given in rbconfig.rb to build the command line, in
your case you've probably forgotten -rdynamic when you have compiled your
source.

Another thing

P> rb_require("sum.rb"); //ruby script is sum.rb

You *must* protect any call to a ruby function which can generate an
error, with rb_protect(), otherwise ruby will crash




Guy Decoux

 

[Phil Tomson]

P> Here is the relevant part of the C-side code:

You don't give the most important part : how do you build your
executable ?

You must use the value given in rbconfig.rb to build the command line, in
your case you've probably forgotten -rdynamic when you have compiled your
source.

Here's how I built:
$ gcc -I/usr/local/lib/ruby/1.8/i686-linux -g -c -o summer.o summer.c
$ gcc -o summer summer.o -L/usr/local/lib/ruby/1.8/i686-linux -lruby-static -ldl -lm -lcrypt
-rdynamic

It didn't make any difference if I used rdynamic or not.

Another thing

P> rb_require("sum.rb"); //ruby script is sum.rb

You *must* protect any call to a ruby function which can generate an
error, with rb_protect(), otherwise ruby will crash

Yes, I know. I was only doing a quick/small test before adding more.

Phil

 

[ts]

P> $ gcc -I/usr/local/lib/ruby/1.8/i686-linux -g -c -o summer.o summer.c
P> $ gcc -o summer summer.o -L/usr/local/lib/ruby/1.8/i686-linux -lruby-static -ldl -lm -lcrypt
P> -rdynamic

P> It didn't make any difference if I used rdynamic or not.

Well, at moulon


svg% cat aa.c
#include <ruby.h>

static VALUE
tt()
{
return rb_require("sum.rb");
}

int main()
{
int value;

ruby_init();
ruby_init_loadpath();
ruby_script("embedded");
rb_protect(tt, Qnil, &value);
if (value) {
VALUE err = rb_inspect(rb_gv_get("$!"));
fprintf(stderr, "ERR %s\n", StringValuePtr(err));
}

ruby_finalize();
exit(0);
}
svg%

svg% cc -I. -I/usr/local/lib/ruby/1.8/i686-linux aa.c -L/usr/local/lib -lruby-static -ldl -lcrypt -lm
svg%

svg% ./a.out
ERR #<LoadError: /usr/local/lib/ruby/1.8/i686-linux/openssl.so: undefined symbol: rb_eRuntimeError - /usr/local/lib/ruby/1.8/i686-linux/openssl.so>
svg%

svg% cc -I. -I/usr/local/lib/ruby/1.8/i686-linux aa.c -L/usr/local/lib -lruby-static -ldl -lcrypt -lm -rdynamic
svg%

svg% ./a.out
svg%




Guy Decoux