[PATCH v5 1/3] Introduce seccomp-assisted syscall filtering

[Dmitry V. Levin]

On Sat, Sep 21, 2019 at 07:02:24PM +0300, Dmitry V. Levin wrote:
[...]
> @@ -1759,6 +1768,11 @@ init(int argc, char *argv[])
>  		error_msg_and_help("PROG [ARGS] must be specified with -D");
>  	}
>  
> +	if (seccomp_filtering && !followfork) {
> +		error_msg("-n implies -f");
> +		followfork = 1;
> +	}
> +
>  	if (optF) {
>  		if (followfork) {
>  			error_msg("deprecated option -F ignored");

Looks like -n is currently not compatible with -p, compare e.g.

./set_ptracer_any ./sleep 1 & ../strace -n -f -qq -e trace=exit_group -p $!
and
./set_ptracer_any ./sleep 1 & ../strace    -f -qq -e trace=exit_group -p $!


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