[LTP] Re: Same syscall is defined to different numbers on 3 different archs(was Re: Makefile issue)

[Robert W. <ro...@us...>]

The original note had the testcases in question, which uses
_syscall3......but since this was left off I'll summarize.  The author did
use the following:

_syscall3 (int, timer_create, clockid_t, which_clock, struct sigevent *,
      timer_event_spec, timer_t *, timer_id);

but compilation failed with:

timer_delete01.c: In function `timer_create':
timer_delete01.c:86: `__NR_timer_create' undeclared (first use in this
function)

The only way we were able to resolve this was to either to add the kernel
includes to the include path: "-I /usr/src/linux-2.5.66/include".
Obviously, this option will not work for the LTP and our users who
frequently change kernel levels and install locations, we have to use "such
ugly, platform-dependent code"

- Robbie

Robert V. Williamson <ro...@us...>
Linux Test Project
IBM Linux Technology Center
Phone: (512) 838-9295   T/L: 678-9295
Fax: (512) 838-4603
Web: http://ltp.sourceforge.net
IRC: #ltp on freenode.irc.net
====================
"Only two things are infinite, the universe and human stupidity, and I'm
not sure about the former." -Albert Einstein


                                                                                                                                      
                      David Mosberger                                                                                                 
                      <davidm@napali.hp        To:       Robert Williamson/Austin/IBM@IBMUS                                           
                      l.hp.com>                cc:       Andi Kleen <ak...@su...>, ani...@wi...,                        
                                                lin...@vg..., ltp...@li...                          
                      04/07/2003 01:08         Subject:  Re: Same syscall is defined to different numbers on 3 different archs(was    
                      PM                        Re: Makefile  issue)                                                                  
                      Please respond to                                                                                               
                      davidm                                                                                                          
                                                                                                                                      




>>>>> On Mon, 7 Apr 2003 11:26:49 -0500, "Robert Williamson"
<ro...@us...> said:

  Robert> Hmmm...so I guess the only viable solution for a single test
  Robert> to cover as many archs as possible, is to explicitly define
  Robert> the number for each arch.

  Robert> Here's how I would do it Aniruddha:
  Robert> ------------------------------------------
  Robert> #ifdef __i386__
  Robert> #define __NR_timer_create 259
  Robert> #endif

  Robert> #ifdef __x86_64__
  Robert> #define __NR_timer_create 222
  Robert> #endif

  Robert> #if defined(__ppc__) || defined(__ppc64__)
  Robert> #define __NR_timer_create 240
  Robert> #else /* Not defined on this architecture */

  Robert> #include "test.h"
  Robert> #include "usctest.h"

  Robert> int TST_TOTAL = 0;      /* Total number of testcases */

  Robert> int main()
  Robert> {
  Robert> tst_resm(TCONF,"This system call is not defined for this
architecture.");
  Robert> tst_exit();
  Robert> /* NOT REACHED */
  Robert> return(0);
  Robert> }
  Robert> #endif /* Not defined on this architecture */

  Robert> <REST OF TEST HERE>
  Robert> ------------------------------------------

  Robert> Any comments???

Why use such ugly, platform-dependent code when syscall(3) will do it
just fine?  (AFAIK, there is no man-page for syscall(3), but the glibc
info manual documents it in detail.)

             --david