From: Michael Hale <michael@...>
Date: 2003-12-04T06:34:49+09:00
Subject: c extension troubles on windows

Hi ruby extension geeks, and thanks in advance for your help.

The short version of the issue that I am struggling with is that I have 
a native library I created a ruby extension for.  The extension works 
on linux, but on windows it does not.

I have copies of the library I am extending for both windows and linux 
from our vendor (Spirent).  I am using gcc on linux and MSVC.NET on 
windows.  Everything compiles and links without complaining.

On both windows and linux I am able to successfully execute the method 
"ETGetLibVersion" which gives me back the library version.  I run into 
trouble on windows when I try to call "ETSocketLink".  On linux this 
call connects and returns as I would expect, however on windows it 
connects and blocks.  For example when I do a printf before and after 
this call I only get output from the first printf and I have to kill 
the process to get my cursor back.

Is this a problem with the way I am compiling on windows?  A problem 
with Spirent's library?  Or some other issue that a non-c programmer 
like myself would be totally ignorant of.

Here is the relevant c and ruby code:

Ruby:
require "./smartlib.so"
include SmartLib
p eTGetLibVersion
p eTSocketLink("192.168.1.244", 16385)

C:
#include "ruby.h"
#include "et1000.h"

static VALUE smartlib_ETSocketLink(VALUE self, VALUE ip, VALUE port) {
	int c_result;	
	printf("before");
	c_result = ETSocketLink(STR2CSTR(ip), NUM2INT(port));	printf("after");
	return Qnil;
}
static VALUE smartlib_ETGetLibVersion() {	
	char pszDescription[50];
	char pszVersion[20];	
	int c_result = ETGetLibVersion(pszDescription, pszVersion);

	VALUE result = rb_ary_new();
	rb_ary_push(result, INT2NUM(c_result));
	rb_ary_push(result, rb_str_new2(pszDescription));
	rb_ary_push(result, rb_str_new2(pszVersion));
	return result;
}

VALUE cSmartLib;
void Init_smartlib(){
	cSmartLib=rb_define_module("SmartLib");
	rb_define_method(cSmartLib, "eTSocketLink", smartlib_ETSocketLink, 
2);	rb_define_method(cSmartLib, "eTGetLibVersion", 
smartlib_ETGetLibVersion, 0);
}