[Vm-dev] ucontext.h or sys/ucontext.h

[stes]

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Minor technical issue.

Regarding platforms/unix/vm/include_ucontext.h

Solaris has a #include <sys/ucontext.h> so the build was working,
but some versions adhere to the "Single Unix Specification v2" (SUS v2).

According to some info (I'm no expert in this) this is Solaris 7/8

           SUSv2        superset of SUS extended      Solaris 7
                        to support POSIX.1b-1993,
                        POSIX.1c-1996, and ISO/IEC
                        9899 (C Standard)
                        Amendment 1

Now that standard speficies that you can #include <ucontext.h>
instead of #include <sys/ucontext.h>

Also see
https://pubs.opengroup.org/onlinepubs/7908799/xsh/ucontext.h.html

I've added a small #ifdef __sun fix to use #include <ucontext.h> in the 
Solaris case.

Alternatively perhaps the configure script could check for the
existence of the <ucontext.h> header file ...

Unfortunately the #include's that the program issues,
does have obviously major impact on the behaviour of the VM.

Another issue one of the fixes I submitted in the sunos branch is

or was :

  # include <sys/file.h> /* FASYNC or ioctl FIOASYNC will be issued  */

in the file platforms/unix/vm/aio.c

The issue there (completely unrelated to the ucontext.h issue) is that
that header file determines how the code in aio.c works

Because in aio.c there is code

#if defined(O_ASYNC)
#elif defined(FASYNC)
#elif defined(FIOASYNC)

great care about the configuration of header files (#include) is needed.

Perhaps also in the case of aio.c this could be dealt with in the configure
script.

The configure script could also in that case try to figure out what
the correct #include is, but it has major impact of course on the
behavior of the VM ...

David Stes

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