CentOS - Apr 2007 - Problem with gettid() on CentOS 5/gcc 4.1.1

I can't get the simple program below to compile on CentOS 5 beta.  It
compiles
(and runs) just fine on CentOS 4.4, and I'm using gettid() as described in
the
man page.  I wonder if this is a problem with RHEL 5 as well, but I don't
have a
system to test on.  I also wonder if this is a gcc 4.1.1 issue or something
missing in CentOS 5.

The issue is that the _syscall0 macro is not defined anywhere.  If I copy and
paste the following definition for _syscall0 from a CentOS 4.4 system into the
test program, it works just fine:

  #define _syscall0(type,name) \
  type name(void) \
  {\
      return syscall(__NR_##name);\
  }

Has anyone else run into this problem?

Alfred


#include <stdio.h>
#include <sys/types.h>
#include <linux/unistd.h>
#include <errno.h>

_syscall0(pid_t, gettid)

int main(int argc, char *argv[])
{
    printf("My tid is 0x%08x\n", gettid());
}

A quick update to this topic.  As I alluded to in my original post,  
the real issue is that the _syscall0 macro is not defined.  Actually,  
none of the _syscallx (where x goes from 0 to 6) macros are defined  
in /usr/include/linux/unistd.h as they are on a CentOS 4.4 system.  I  
grep'ed in all of /usr/include and couldn't find any references to  
these macros.  Have they been deprecated or is this an oversight?  At  
least one man page (gettid) still references _syscall0...

Alfred

On Mon, Apr 02, 2007 at 11:58:28AM -0400, Alfred von Campe
wrote:
> I can't get the simple program below to compile on CentOS 5 beta.  It
compiles
> (and runs) just fine on CentOS 4.4, and I'm using gettid() as described
in the
> man page.  I wonder if this is a problem with RHEL 5 as well, but I
don't have a
> system to test on.  I also wonder if this is a gcc 4.1.1 issue or something
> missing in CentOS 5.
> 
> The issue is that the _syscall0 macro is not defined anywhere.  If I copy
and
> paste the following definition for _syscall0 from a CentOS 4.4 system into
the
> test program, it works just fine:
> 
>   #define _syscall0(type,name) \
>   type name(void) \
>   {\
>       return syscall(__NR_##name);\
>   }
> 
> Has anyone else run into this problem?
> 
> Alfred
I've got an APP at work that will need to be working on RH5 and possibly
Centos 5 that uses gettid(), so I'm going to hang onto your posting just
in case it is a problem in the real release. Haven't tried RH5 yet, but
I will be (and Centos, too, once it comes out). 

Thanks for the heads-up.

-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us
-----------------------------
               But God demonstrates his own love for us in this: 
                         While we were still sinners, 
                              Christ died for us.
------------------------------- Romans 5:8 (niv) ------------------------------
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Could someone with access to a RHEL 5 system please post the output  
of the following command:

   grep -RE "#define[[:space:]]+_syscall" /usr/include

I'd like to know if this problem affects RHEL 5 as well.

Thanks,
Alfred