Re: @@GLIBC_2.1
Appearantly, the fdopen implementation (and several other things) changed
between glibc 2.0 and 2.1. The @@GLIBC_X.X indicates which behavior you get.
I think there may be some global variable that lives in the application that
says which version it was linked against, but I'm not sure of the details (but
need to learn & document it).
The mangle section of the specification is for this type of thing. The source
signature
FILE * fdopen(int fildes, const char *mode)
is mangled to
FOO * fdopen@@GLIBC_2.0(..????..)
Again, I haven't figured out all of the details, but need to before our
next meeting.
On Mon, 8 Nov 1999 gk4@us.ibm.com wrote:
>
>
> While trying to inventory the APIs and libraries used by applications such
> as StarOffice51 and WordPerfect8 I have stumbled across some redundant APIs
> with @GLIBC_2.0 and @@GLIBC_2.1 suffixes on RedHat 6.0. So, for example,
> if I look at Netscape Communicator 4.7 I see that "fdopen" is undefined and
> needs to be resolved.
>
> [gk4@act5 gk4]$ nm -D -g /usr/local/netscape/netscape | grep fdopen
> U fdopen
>
> Looking at what libraries are dynamically linked, I see libc.so.6 is linked
> to netscape to resolve "fdopen".
>
> [gk4@act5 gk4]$ ldd /usr/local/netscape/netscape
> libBrokenLocale.so.1 => /lib/libBrokenLocale.so.1 (0x40018000)
> libXt.so.6 => /usr/X11R6/lib/libXt.so.6 (0x4001a000)
> libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x40064000)
> libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x4006e000)
> libXmu.so.6 => /usr/X11R6/lib/libXmu.so.6 (0x40083000)
> libXpm.so.4 => /usr/X11R6/lib/libXpm.so.4 (0x40095000)
> libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x400a2000)
> libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x400ad000)
> libdl.so.2 => /lib/libdl.so.2 (0x4014a000)
> libstdc++-libc6.1-1.so.2 => /usr/lib/libstdc++-libc6.1-1.so.2
> (0x4014d000)
> libm.so.6 => /lib/libm.so.6 (0x40190000)
> libc.so.6 => /lib/libc.so.6 (0x401ac000)
> /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
>
> However, when I look in libc.so.6 I see two "fdopen" definitions with
> either a @GLIBC_2.0 or @@GLIBC_2.1 suffix!
>
> [gk4@act5 gk4]$ nm -g /lib/libc.so.6 | grep fdopen
> 00050ae0 T _IO_fdopen@@GLIBC_2.1
> 00053410 T _IO_fdopen@GLIBC_2.0
> 00050ae0 T fdopen@@GLIBC_2.1
> 00053410 T fdopen@GLIBC_2.0
>
> How is "fdopen" being resolved? What is the purpose of the @GLIBC_2.0 or
> @@GLIBC_2.1 suffixes?
>
> George Kraft IV
> gk4@us.ibm.com
> 512-838-2688; t/l 678-2688
> Linux Technology Center
> IBM, Austin Texas
>
>
>
> --
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Stuart
Stuart R. Anderson anderson@metrolink.com
Metro Link Incorporated South Carolina Office
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