[uClibc 0002084]: SysVIPC does not work on old kernels

bugs at busybox.net bugs at busybox.net
Fri Feb 15 23:41:54 UTC 2008


A NOTE has been added to this issue. 
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http://busybox.net/bugs/view.php?id=2084 
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Reported By:                michael_d
Assigned To:                uClibc
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Project:                    uClibc
Issue ID:                   2084
Category:                   Other
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     assigned
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Date Submitted:             02-07-2008 20:00 PST
Last Modified:              02-15-2008 15:41 PST
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Summary:                    SysVIPC does not work on old kernels
Description: 
The functions shmctl(), semctl(), and msgctl() unconditionally or their
subcommand argument with __IPC_64.  That flag was only added in Linux 2.4,
so they will always fail on older kernels.

I've prepared a patch to allow IPC to work on old kernels.  Since __IPC_64
signals a different format of the syscall arguments and I haven't changed
the userspace structures, a significant amount of marshalling code needed
to be added.

The patch does need some adaptation before it can go into the mainline. 
Since it is not safe to include <linux/ipc.h>, I cannot probe whether the
current kernel supports __IPC_64 or not.  Thus, this patch will
unconditionally use old kernel structures.  I've left a "#if 0" in
libc/misc/sysvipc/ipc.h that can be flipped to produce a library for 2.4+.
====================================================================== 

---------------------------------------------------------------------- 
 vapier - 02-15-08 15:41  
---------------------------------------------------------------------- 
make the code conditional on the versions of the kernel headers being
compiled against 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
02-07-08 20:00  michael_d      New Issue                                    
02-07-08 20:00  michael_d      Status                   new => assigned     
02-07-08 20:00  michael_d      Assigned To               => uClibc          
02-07-08 20:00  michael_d      File Added: uClibc-0.9.29-ipc32.diff             
      
02-15-08 15:41  vapier         Note Added: 0004934                          
======================================================================




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