Modifying bits/sched.h in eglibc source package

2011-06-27 Thread Miguel Telleria de Esteban 
Dear all,

I am new in this list, I am hacking around eglibc source package to
support a change in the linux kernel ABI that I am installing on my
local Ubuntu system.

The ABI change consists in:

*  Extending struct sched_param to support POSIX SCHED_SPORADIC
   according to a patch proposed in the LKML:

http://lkml.org/lkml/2008/8/11/160

   struct sched_param {
int __sched_priority;
+   int sched_ss_low_priority;
+   struct timespec sched_ss_repl_period;
+   struct timespec sched_ss_init_budget;
+   int sched_ss_max_repl;
};


*  Adding a new #define SCHED_SPORADIC value of 6.

Both changes affect the installed file:

/usr/include/bits/sched.h

However, inside the eglibc source package I find 2 instances of this
file:

bits/sched.h
sysdepends/unix/sysv/linux/bits/sched.h

MY QUESTIONS ARE:

1. Why there are TWO files bits/sched.h in the source package?
bits/sched.h
sysdepends/unix/sysv/linux/bits/sched.h

2. Is the first one (bits/sched.h) generated automatically from the
   second (sysdepends/unix/sysv/linux/bits/sched.h)?, 
   or
   if we change second, can the modifications be updated in the first
   automatically with a specific command or make rule?

3. Lots of values from these files seem to come from the kernel
   headers, in  particular:

   /usr/src/linux-rt-headers-2.6.31-11/include/linux/sched.h 
   (I am using linux-rt source package from Ubuntu Lucid)
   http://packages.ubuntu.com/source/lucid-updates/linux-rt

   Is there a way to synchronize automatically eglibc headers with
   kernel headers?


Thanks for your attention and help,

Cheers,

   Miguel


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Re: Modifying bits/sched.h in eglibc source package

2011-06-27 Thread Aurelien Jarno 
On Mon, Jun 27, 2011 at 08:35:41PM +0200, Miguel Telleria de Esteban wrote:
 Dear all,
 
 I am new in this list, I am hacking around eglibc source package to
 support a change in the linux kernel ABI that I am installing on my
 local Ubuntu system.
 
 The ABI change consists in:
 
 *  Extending struct sched_param to support POSIX SCHED_SPORADIC
according to a patch proposed in the LKML:
 
 http://lkml.org/lkml/2008/8/11/160
 
struct sched_param {
   int __sched_priority;
 + int sched_ss_low_priority;
 + struct timespec sched_ss_repl_period;
 + struct timespec sched_ss_init_budget;
 + int sched_ss_max_repl;
 };
 
 
 *  Adding a new #define SCHED_SPORADIC value of 6.
 
 Both changes affect the installed file:
 
 /usr/include/bits/sched.h
 
 However, inside the eglibc source package I find 2 instances of this
 file:
 
 bits/sched.h
 sysdepends/unix/sysv/linux/bits/sched.h
 
 MY QUESTIONS ARE:
 
 1. Why there are TWO files bits/sched.h in the source package?
 bits/sched.h

This is for internal use when building the GNU libc.

 sysdepends/unix/sysv/linux/bits/sched.h

This is the one installed on the system.

 2. Is the first one (bits/sched.h) generated automatically from the
second (sysdepends/unix/sysv/linux/bits/sched.h)?, 
or
if we change second, can the modifications be updated in the first
automatically with a specific command or make rule?

No they are independent, there is no rule to build one from another.

 3. Lots of values from these files seem to come from the kernel
headers, in  particular:
 
/usr/src/linux-rt-headers-2.6.31-11/include/linux/sched.h 
(I am using linux-rt source package from Ubuntu Lucid)
http://packages.ubuntu.com/source/lucid-updates/linux-rt
 
Is there a way to synchronize automatically eglibc headers with
kernel headers?
 

No.

Aurelien

-- 
Aurelien Jarno  GPG: 1024D/F1BCDB73
aurel...@aurel32.net http://www.aurel32.net


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