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Re: .sy_narg definition

On Tuesday, March 26, 2002, at 11:21 AM, David Blanton wrote:

On Wednesday, March 20, 2002, at 04:59 PM, Stefan Arentz wrote:

Patching BSD syscalls? Evil! But possible :-)

int32_t saved_open = sysent[SYS_open].sy_call;
sysent[10].sy_call = (int32_t) &my_open;



Well, don't count on it being that easy. The symbols are going away in the future release.
And it is also possible that the table may be "read only". So code above as is will cause a kernel panic...



------------------
I implemented this code via a KEXT and my routine is called when a file is
opened.

A question if I may:

Where do I find the definition of the argument list for SYS_open

.sy_narg tells me how many but what are they and how are they passed?

Thanks,

db

Please do not patch system call table. I bet there are other ways of achieving what you want to do ...


Thanks,
--Umesh
--
Umesh Vaishampayan Apple Computer, Inc.
Mac OS X Kernel Ph: (408) 974 0229
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References: 
 >.sy_narg definition (From: David Blanton <email@hidden>)



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