[PATCH] ntdll: Block SIGTRAP during server calls.

[Huw Davies]

On 15 Oct 2018, at 15:08, Huw Davies <huw at codeweavers.com> wrote:
> 
> This prevents issues with gdbproxy, where gdb adds breakpoints to
> the dynamic loader which get triggered on thread destruction.
> It also allows setting a gdb breakpoint in sigaction().
> 
> Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45070
> Signed-off-by: Huw Davies <huw at codeweavers.com>
> ---
> dlls/ntdll/server.c | 3 +++
> 1 file changed, 3 insertions(+)
> 
> diff --git a/dlls/ntdll/server.c b/dlls/ntdll/server.c
> index ec03445..689f0e7 100644
> --- a/dlls/ntdll/server.c
> +++ b/dlls/ntdll/server.c
> @@ -1399,6 +1399,9 @@ void server_init_process(void)
>     sigaddset( &server_block_set, SIGUSR1 );
>     sigaddset( &server_block_set, SIGUSR2 );
>     sigaddset( &server_block_set, SIGCHLD );
> +#ifdef SIGTRAP
> +    sigaddset( &server_block_set, SIGTRAP );
> +#endif
>     pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );
> 
>     /* receive the first thread request fd on the main socket */

Hmm, this can't work as the debugger needs to handle the overwritten
opcode.  Sorry for the noise.

Huw.