# \[Bug #1453\] dl in ruby-1.9 must check whether block is given to TempFunction

**URL:** <https://www.ruby-forum.com/t/bug-1453-dl-in-ruby-1-9-must-check-whether-block-is-given-to-tempfunction/167605>\
**Category:** Development\
**Created:** [May 10, 2009, 2:46am UTC](https://www.ruby-forum.com/t/bug-1453-dl-in-ruby-1-9-must-check-whether-block-is-given-to-tempfunction/167605 "2009-05-10T02:46:00Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Takashi\_T](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/4af34b/32.png) [@Takashi\_T](https://www.ruby-forum.com/u/Takashi_T)\
**Post date:** [May 10, 2009, 2:46am UTC](https://www.ruby-forum.com/t/bug-1453-dl-in-ruby-1-9-must-check-whether-block-is-given-to-tempfunction/167605/1 "2009-05-10T02:46:00Z")

</div>

Bug #1453: dl in ruby-1.9 must check whether block is given to  
TempFunction  
[http://redmine.ruby-lang.org/issues/show/1453](http://redmine.ruby-lang.org/issues/show/1453)

e$B5/I\<\<Te(B: Takashi T.  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal  
e$B%+%F%4%je(B: ext, Target version: 1.9.2  
ruby -v: ruby 1.9.2dev (2009-05-02 trunk 23326) [i686-linux]

e$B0J2\<$N$h$&$K%V%m%C%/IU$-$G8F$V$Y$-$H$3$m$G8F$P$J$$$HMn$A$^$9!#e(B

$ cat d7.rb  
require ‘dl/import’

require ‘dl/import’  
module M  
extend DL::Importer  
dlload “libc.so.6”  
QsortCallbackWithoutBlock = bind(“void _qsort\_callback(void_,  
void\*)”, :temp)  
extern ‘void qsort(void \*, int, int, void \*)’  
end  
buff = “3465721”  
M.qsort(buff, buff.size, 1, M::QsortCallbackWithoutBlock) # \<=  
e$B$3$3$O%V%m%C%/$D$-$G8F$P$J$$$H$$$1$J$$!#e(B

$ ruby-1.9 d7.rb  
/usr/local/pkg/ruby-1.9/lib/ruby/1.9.1/dl/func.rb:37: [BUG] Segmentation  
fault  
ruby 1.9.2dev (2009-05-02 trunk 23326) [i686-linux]

e$B%V%m%C%/$,M?$($i$l$?$+$r%A%'%C%/$9$k%Q%C%A$G$9!#e(B

# Index: lib/dl/value.rb

— lib/dl/value.rb (e$B%j%S%8%g%se(B 23328)  
+++ lib/dl/value.rb (e$B:n6H%3%T!\<e(B)  
@@ -63,6 +63,8 @@ module DL  
if( block )  
arg.bind\_at\_call(&block)  
funcs.push(arg)

- 

```
     elsif arg.is_a?(TempFunction)

```

- 

```
       raise(RuntimeError, "block must be given.")
     end
     return arg.to_i
   when String

```

---

<div class="post-metadata">

**Author:** ![Takashi\_T](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/4af34b/32.png) [@Takashi\_T](https://www.ruby-forum.com/u/Takashi_T)\
**Post date:** [May 10, 2009, 4:37am UTC](https://www.ruby-forum.com/t/bug-1453-dl-in-ruby-1-9-must-check-whether-block-is-given-to-tempfunction/167605/2 "2009-05-10T04:37:56Z")

</div>

e$B%A%1%C%He(B #1453 e$B$,99?7$5$l$^$7$?!#e(B (by Nobuyoshi N.)

e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B  
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

## Applied in changeset r23386.

[http://redmine.ruby-lang.org/issues/show/1453](http://redmine.ruby-lang.org/issues/show/1453)