Re: [PATCH] devfsd, compiling on glibc22x

Re: [PATCH] devfsd, compiling on glibc22x

[Douglas Gilbert]

While on the subject of devfs:
  - it doesn't seem to have any entries for raw devices:
    /dev/rawctl, /dev/raw/raw1, etc
  - when I upgraded to glibc 2.2 (via a rpm) in RH 7.0
    this line in /etc/devfsd.conf caused devfsd to 
    seg fault:
    "LOOKUP      ^cdrom$      CFUNCTION      GLOBAL     
         symlink ${mntpnt}/cdroms/cdrom0 $devpath"
    Rebuilding devfsd didn't help.

Doug Gilbert
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[PATCH] devfsd, compiling on glibc22x

[David Ford]

This patch is simple, defines RTLD_NEXT if not previously defined.

--- devfsd.c.orig       Sat Jan 27 18:14:19 2001
+++ devfsd.c    Sat Jan 27 18:15:46 2001
@@ -165,6 +165,7 @@
     Last updated by Richard Gooch   3-JUL-2000: Added "-C
/etc/modules.devfs"
   when calling modprobe(8). Fail if a configuration line has EXECUTE
modprobe.

+    Updated by      David Ford      27-JAN-2001: Added RTLD_NEXT define


 */
 #include <unistd.h>
@@ -221,6 +222,10 @@
 #define AC_MKNEWCOMPAT              8
 #define AC_RMOLDCOMPAT              9
 #define AC_RMNEWCOMPAT              10
+
+#ifndef RTLD_NEXT
+# define RTLD_NEXT     ((void *) -1l)
+#endif

 struct permissions_type
 {


--
  There is a natural aristocracy among men. The grounds of this are virtue and talents. Thomas Jefferson
  The good thing about standards is that there are so many to choose from. Andrew S. Tanenbaum



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Re: [PATCH] devfsd, compiling on glibc22x

[Pierre Rousselet]

David Ford wrote:
> 
> This patch is simple, defines RTLD_NEXT if not previously defined.
> 
> --- devfsd.c.orig       Sat Jan 27 18:14:19 2001
> +++ devfsd.c    Sat Jan 27 18:15:46 2001
> @@ -165,6 +165,7 @@
>      Last updated by Richard Gooch   3-JUL-2000: Added "-C
> /etc/modules.devfs"
>    when calling modprobe(8). Fail if a configuration line has EXECUTE
> modprobe.
> 
> +    Updated by      David Ford      27-JAN-2001: Added RTLD_NEXT define
> 
>  */
>  #include <unistd.h>
> @@ -221,6 +222,10 @@
>  #define AC_MKNEWCOMPAT              8
>  #define AC_RMOLDCOMPAT              9
>  #define AC_RMNEWCOMPAT              10
> +
> +#ifndef RTLD_NEXT
> +# define RTLD_NEXT     ((void *) -1l)
> +#endif
> 
>  struct permissions_type
>  {


for me :
make CFLAGS='-O2 -I. -D_GNU_SOURCE' 
compiles without any patch. is it correct ?

-- 
------------------------------------------------
 Pierre Rousselet <pierre.rousselet@wanadoo.fr>
------------------------------------------------
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Re: [PATCH] devfsd, compiling on glibc22x

[Ulrich Drepper]

Pierre Rousselet <pierre.rousselet@wanadoo.fr> writes:

> for me :
> make CFLAGS='-O2 -I. -D_GNU_SOURCE' 
> compiles without any patch. is it correct ?

Yes.  RTLD_NEXT is not in any standard, it's an extension available
via -D_GNU_SOURCE.

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---------------.                          ,-.   1325 Chesapeake Terrace
Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
Red Hat          `--' drepper at redhat.com   `------------------------
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Re: [PATCH] devfsd, compiling on glibc22x

[David Ford]

Ulrich Drepper wrote:

> Pierre Rousselet <pierre.rousselet@wanadoo.fr> writes:
>
> > for me :
> > make CFLAGS='-O2 -I. -D_GNU_SOURCE'
> > compiles without any patch. is it correct ?
>
> Yes.  RTLD_NEXT is not in any standard, it's an extension available
> via -D_GNU_SOURCE.

Ok, how about we all tag Richard until he adds that to the makefile?  :)

-d

--
  There is a natural aristocracy among men. The grounds of this are virtue and talents. Thomas Jefferson
  The good thing about standards is that there are so many to choose from. Andrew S. Tanenbaum



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Re: [PATCH] devfsd, compiling on glibc22x

[Albert D. Cahalan]

Ulrich Drepper writes:
> Pierre Rousselet <pierre.rousselet@wanadoo.fr> writes:
>
>> for me :
>> make CFLAGS='-O2 -I. -D_GNU_SOURCE' 
>> compiles without any patch. is it correct ?
>
> Yes.  RTLD_NEXT is not in any standard, it's an extension available
> via -D_GNU_SOURCE.

This isn't a HURD feature.
This isn't even a C library feature.
This is a Linux feature.

So the _GNU_SOURCE thing is just plain wrong. Quit trying to
rename the OS.

Since there are so many standards to choose from, putting all features
into the default would be most obvious. Else what, pure C89 maybe?
Dang new-fangled standards might break something. Normal UNIX systems
don't make developers jump through hoops to get access to stuff; they
instead provide clean namespaces upon request.


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Re: [PATCH] devfsd, compiling on glibc22x

[Richard Gooch]

Ulrich Drepper writes:
> Pierre Rousselet <pierre.rousselet@wanadoo.fr> writes:
> 
> > for me :
> > make CFLAGS='-O2 -I. -D_GNU_SOURCE' 
> > compiles without any patch. is it correct ?
> 
> Yes.  RTLD_NEXT is not in any standard, it's an extension available
> via -D_GNU_SOURCE.

So why do old binaries (compiled with glibc 2.1.3) segfault when they
call dlsym() with RTLD_NEXT?  Even newly compiled binaries (with glibc
2.2) still segfault.

				Regards,

					Richard....
Permanent: rgooch@atnf.csiro.au
Current:   rgooch@ras.ucalgary.ca
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Re: [PATCH] devfsd, compiling on glibc22x

[Ulrich Drepper]

Richard Gooch <rgooch@ras.ucalgary.ca> writes:

> So why do old binaries (compiled with glibc 2.1.3) segfault when they
> call dlsym() with RTLD_NEXT?  Even newly compiled binaries (with glibc
> 2.2) still segfault.

What do you ask me?  You wrote the code.

-- 
---------------.                          ,-.   1325 Chesapeake Terrace
Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
Red Hat          `--' drepper at redhat.com   `------------------------
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Re: [PATCH] devfsd, compiling on glibc22x

[Richard Gooch]

Ulrich Drepper writes:
> Richard Gooch <rgooch@ras.ucalgary.ca> writes:
> 
> > So why do old binaries (compiled with glibc 2.1.3) segfault when they
> > call dlsym() with RTLD_NEXT?  Even newly compiled binaries (with glibc
> > 2.2) still segfault.
> 
> What do you ask me?  You wrote the code.

But you wrote dlsym(), right I have a debug trace from someone which
shows that the call to dlsym() segfaults. It's being called thusly:
	dlsym (RTLD_NEXT, "symlink");

This doesn't fail with libc 5 nor with glibc 2.1.3. But it does with
glibc 2.2.

				Regards,

					Richard....
Permanent: rgooch@atnf.csiro.au
Current:   rgooch@ras.ucalgary.ca
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