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Re: DYLD_INSERT_LIBRARIES and read()

On Mar 13, 2008, at 5:00 PM, Luke Daley wrote:
On 13/03/2008, at 5:19 PM, stephen joseph butler wrote: 
I have written an implementation of read(int, void*, size_t) that I
am trying to use via DYLD_INSERT_LIBRARIES. I have this working fine
on 10.4, but not on 10.5.

I have read http://lists.apple.com/archives/Darwin-dev/2007/Nov/
msg00061.html but am still not clear on what I need to do. A follow
up to that post mentions including a header. I can't seem to find any
detail on this header.


Look at the function prototype declaration in <unistd.h> on 10.5. You have to do yours the same way. Macros are defined in <sys/ cdefs.h>.


Thanks Stephen,

I tried and no dice.

I am compiling with …

gcc -dynamiclib -o mylib.dylib -fno-common -framework CoreFoundation -mmacosx-version-min=10.4 mysource.c

Do I need to add something to that?

Specifically, I think I need to provide all 3 symbols (_read, _read $UNIX2003 and _read$NOCANCEL$UNIX2003) for this to work. 

The thing that's killing you is you are using -mmacosx-version-min=10.4

When we compile Libc, we compile it three times in order to get the three versions of the symbols, once each with different definitions. You'll never get the $NOCANCEL version of the symb (the one that avoids the _thread_testcancel() at the start of the system call in the kernel) on a 10.4 deployment target.

-- Terry _______________________________________________
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References: 
 >DYLD_INSERT_LIBRARIES and read() (From: Luke Daley <email@hidden>)
 >Re: DYLD_INSERT_LIBRARIES and read() (From: "stephen joseph butler" <email@hidden>)
 >Re: DYLD_INSERT_LIBRARIES and read() (From: Luke Daley <email@hidden>)



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