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Re: getutxent() not returning values when using 10.4u SDK

On Jul 24, 2008, at 1:51 PM, Rosyna wrote:
If I call setutxent()/getutxent()/endutxent() when using the 10.5 SDK while on 10.5, I correctly get the various fields filled out. If I use the 10.4u SDK only the username is filled out. The ut_type and ut_pid and ut_tv fields are all empty.

Why would they be empty when the only change is the SDK?

You are also changing the libraries you link against when you change your SDK. Prior to 10.5, the utmpx implementation was not fully UNIX conformant, so you get different answers with 10.5 than you did with 10.4; specifically, if you installed in the normal place, you are linking against /Developer/SDKs/MacOSX10.4u.sdk/usr/lib/ libSystem.B.dylib instead of /usr/lib/libSystem.B.dylib.

The specific code that implements the UNIX conformat utmpx in 10.5 is in Libc project in gen/utmpx-darwin.[ch] (10.4 does not have these files).

You are unlikely to be able to back-port this code to 10.4; for the components that were touched for UNIX conformance, there were as many lines of code that changed as were changed in all of the other changes between Tiger and Leopard combined, and there are dependencies on subsequent changes to the structure of libinfo (among others).

If you want the same information back for both SDKs, then you need to limit yourself to utmp instead, since that was fully supported in 10.4, and is a common API (it's considered legacy on 10.5 and later, but it should give the same answers for both SDKs).

-- Terry
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 >getutxent() not returning values when using 10.4u SDK (From: Rosyna <email@hidden>)



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