[lldb-dev] SIG values in driver\Platform.h

Colin Riley colin at codeplay.com
Mon May 26 02:01:01 PDT 2014

The Visual Studio signal.h does not include those signals, so that's 
probably the case. I wouldn't call it a bug.

Due to the different toolchain options available to windows, the config 
paths are quite messy. It would be great getting them cleaned up, but 
whilst we don't have windows buildbots up I think it's just going to end 
in broken TOT for at least one configuration option.


On 25/05/2014 06:56, Zachary Turner wrote:
> I'm working on cleaning getting rid of all warnings durings a Windows 
> build (there are currently thousands), and I've found something 
> unusual in tools\driver\Platform.h.  _INC_SIGNAL is explicitly defined 
> with a comment indicating that the purpose is so that signal.h is not 
> included, and then specific values from signal.h are defined.
> My first question is why not just include signal.h?  Since there is a 
> comment here it's clearly intentional, so I'd like to understand the 
> reasoning before just removing this and including signal.h. I thought 
> maybe it was because some compilers on Windows supported signal.h and 
> others didn't, but then in Platform.cpp there is a comment that says 
> "this file is only relevant for Visual C++".  So that's not it either.
> My second question is regarding the values of some of the constants. 
>  Specifically, these:
>     #define SIG_DFL ( (sighandler_t) -1 )
>     #define SIG_IGN ( (sighandler_t) -2 )
>     #define SIGCONT  18
>     #define SIGTSTP  20
> These are actually not the correct values.  SIG_DFL is 0, SIG_IGN is 
> 1, SIGCONT is 19, and SIGTSTP is 18.  Can I assume this is a bug?   
> Note that, again, simply including signal.h would fix this, so this 
> goes back to my first question about the reasoning behind not 
> including it.
> Thanks,
> Zach
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- Colin Riley
Games Technology Director

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