add native dlopen extension code

This will get dlopen in a consistent place on all the platforms
which need it.

2 files changed, 53 insertions, 0 deletions

diff --git a/ext/ffi_yajl/ext/dlopen/dlopen.c b/ext/ffi_yajl/ext/dlopen/dlopen.c
new file mode 100644
index 0000000..7330763
--- /dev/null
+++ b/ext/ffi_yajl/ext/dlopen/dlopen.c
@@ -0,0 +1,38 @@
+#include <ruby.h>
+
+#if defined(HAVE_DLFCN_H)
+# include <dlfcn.h>
+#ifndef RTLD_LAZY
+#define RTLD_LAZY 0
+#endif
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif
+#ifndef RTLD_NOW
+#define RTLD_NOW 0
+#endif
+#else
+# if defined(_WIN32)
+#   include <windows.h>
+#   define dlopen(name,flag) ((void*)LoadLibrary(name))
+#   define dlerror() strerror(rb_w32_map_errno(GetLastError()))
+#   define dlsym(handle,name) ((void*)GetProcAddress((handle),(name)))
+#   define RTLD_LAZY -1
+#   define RTLD_NOW  -1
+#   define RTLD_GLOBAL -1
+# endif
+#endif
+
+static VALUE mFFI_Yajl, mDlopen, mExt;
+
+static VALUE mDlopen_dlopen(VALUE self, VALUE file) {
+  dlopen(RSTRING_PTR(file), RTLD_NOW|RTLD_GLOBAL);
+  return Qnil;
+}
+
+void Init_dlopen() {
+  mFFI_Yajl = rb_define_module("FFI_Yajl");
+  mExt = rb_define_module_under(mFFI_Yajl, "Ext");
+  mDlopen = rb_define_module_under(mExt, "Dlopen");
+  rb_define_method(mDlopen, "dlopen", mDlopen_dlopen, 1);
+}
diff --git a/ext/ffi_yajl/ext/dlopen/extconf.rb b/ext/ffi_yajl/ext/dlopen/extconf.rb
new file mode 100644
index 0000000..7e18469
--- /dev/null
+++ b/ext/ffi_yajl/ext/dlopen/extconf.rb
@@ -0,0 +1,15 @@
+require 'mkmf'
+require 'rubygems'
+
+RbConfig::MAKEFILE_CONFIG['CC'] = ENV['CC'] if ENV['CC']
+
+puts $CFLAGS
+puts $LDFLAGS
+
+have_header("dlfcn.h")
+
+have_library("dl", "dlopen")
+
+dir_config 'dlopen'
+
+create_makefile 'ffi_yajl/ext/dlopen'