[Xenomai-core] Undefined reference to Posix shm_* with uClibc

[Xenomai-core] Undefined reference to Posix shm_* with uClibc

[Hagen.Langbartels]

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Hi all,

I tried to compile Xenomai 2.5rc4 with uClibc 0.9.30.1 and ran into some 
problems with references to the 
posix functions shm_open and shm_unlink in /src/skins/posix/wrappers.c, 
which do not exist in uClibc.

Unlinke in  /src/skins/posix/shm.c the existence of these functions is not 
verfied (via #ifdef HAVE_SHM_*)
and the build fails.

The following patch is a quick and dirty fix for this problem. I hope this 
might be helpful.


diff -Nur xenomai-2.4.93.orig/src/skins/posix/wrappers.c 
xenomai-2.4.93.work/src/skins/posix/wrappers.c
--- xenomai-2.4.93.orig/src/skins/posix/wrappers.c      2009-03-30 
12:24:50.000000000 +0200
+++ xenomai-2.4.93.work/src/skins/posix/wrappers.c      2009-12-07 
14:22:03.983876500 +0100
@@ -245,17 +245,21 @@
 }
 
 /* shm */
+#ifdef HAVE_SHM_OPEN
 __attribute__ ((weak))
 int __real_shm_open(const char *name, int oflag, mode_t mode)
 {
        return shm_open(name, oflag, mode);
 }
+#endif
 
+#ifdef HAVE_SHM_UNLINK
 __attribute__ ((weak))
 int __real_shm_unlink(const char *name)
 {
        return shm_unlink(name);
 }
+#endif
 
 __attribute__ ((weak))
 int __real_ftruncate(int fildes, long length)




Best regards,
Hagen Langbartels

SIEB & MEYER AG
Dipl.-Inf. (FH) Hagen Langbartels

Auf dem Schmaarkamp 21
21339 Lüneburg
Germany
Tel.: +49-4131-203-1133
Fax.: +49-4131-38562
E-mail: development@domain.hid
www.sieb-meyer.de

Vorstand: Markus Meyer, Torsten Blankenburg
Aufsichtsratsvorsitzender: Hans Reinen
Amtsgericht Lüneburg: HRB 1805
Umsatzsteuer-ID.-Nr.: DE 116085664

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Re: [Xenomai-core] Undefined reference to Posix shm_* with uClibc

[Jan Kiszka]

Hagen.Langbartels@domain.hid wrote:
> Hi all,
> 
> I tried to compile Xenomai 2.5rc4 with uClibc 0.9.30.1 and ran into some 
> problems with references to the 
> posix functions shm_open and shm_unlink in /src/skins/posix/wrappers.c, 
> which do not exist in uClibc.
> 
> Unlinke in  /src/skins/posix/shm.c the existence of these functions is not 
> verfied (via #ifdef HAVE_SHM_*)
> and the build fails.
> 
> The following patch is a quick and dirty fix for this problem. I hope this 
> might be helpful.
> 

Actually, it looks clean to me. Can you provide it with the formal
signed-off, proper title and short description (as recent commits look
like in Xenomai)?

Jan

> 
> diff -Nur xenomai-2.4.93.orig/src/skins/posix/wrappers.c 
> xenomai-2.4.93.work/src/skins/posix/wrappers.c
> --- xenomai-2.4.93.orig/src/skins/posix/wrappers.c      2009-03-30 
> 12:24:50.000000000 +0200
> +++ xenomai-2.4.93.work/src/skins/posix/wrappers.c      2009-12-07 
> 14:22:03.983876500 +0100
> @@ -245,17 +245,21 @@
>  }
>  
>  /* shm */
> +#ifdef HAVE_SHM_OPEN
>  __attribute__ ((weak))
>  int __real_shm_open(const char *name, int oflag, mode_t mode)
>  {
>         return shm_open(name, oflag, mode);
>  }
> +#endif
>  
> +#ifdef HAVE_SHM_UNLINK
>  __attribute__ ((weak))
>  int __real_shm_unlink(const char *name)
>  {
>         return shm_unlink(name);
>  }
> +#endif
>  
>  __attribute__ ((weak))
>  int __real_ftruncate(int fildes, long length)
> 
> 
> 
> 
> Best regards,
> Hagen Langbartels
> 
> SIEB & MEYER AG
> Dipl.-Inf. (FH) Hagen Langbartels
> 
> Auf dem Schmaarkamp 21
> 21339 Lüneburg
> Germany
> Tel.: +49-4131-203-1133
> Fax.: +49-4131-38562
> E-mail: development@domain.hid
> www.sieb-meyer.de
> 
> Vorstand: Markus Meyer, Torsten Blankenburg
> Aufsichtsratsvorsitzender: Hans Reinen
> Amtsgericht Lüneburg: HRB 1805
> Umsatzsteuer-ID.-Nr.: DE 116085664
> 
> 

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