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SubjectRE: X86 fpu registers in a signal handler's ucontext
Warlich, Christof writes:
> richard -rw- weinberger <richard.weinberger@gmail.com> writes:
> > Are you telling us that Ubuntu shipped the wrong header file?
>
> Hmm - at least I still don't know how to get the right definition
> of uc_mcontext (with eglibc-2.13 on Ubuntu 11.10) ...
>
> If I include both signal.h and asm-generic/ucontext.h, gcc reports
> this error:
>
> /usr/include/asm-generic/ucontext.h:4:8: error: redefinition of 'struct ucontext'
> /usr/include/i386-linux-gnu/sys/ucontext.h:119:16: error: previous definition of 'struct ucontext'
>
> Thus, signal.h obviously includes the wrong i386-linux-gnu/sys/ucontext.h
> defining uc_mcontext to be of type mcontext_t.
>
> So is it still me doing something wrong or or _did_ Ubuntu ship
> the wrong header files?

#include <signal.h>
#include <ucontext.h>

has worked for my SIGFPE handlers on Linux for the last 10+ years on various distros
and target architectures.

Can we stop this thread now? There is no _kernel_ issue here.


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