container/std: relocate rule types

This enables its use in hst for #15.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/std/seccomp.go

@@ -0,0 +1,38 @@
+package std
+
+type (
+	// ScmpUint is equivalent to C.uint.
+	ScmpUint uint32
+	// ScmpInt is equivalent to C.int.
+	ScmpInt int32
+
+	// ScmpSyscall represents a syscall number passed to libseccomp via [NativeRule.Syscall].
+	ScmpSyscall ScmpInt
+	// ScmpErrno represents an errno value passed to libseccomp via [NativeRule.Errno].
+	ScmpErrno ScmpInt
+
+	// ScmpCompare is equivalent to enum scmp_compare;
+	ScmpCompare ScmpUint
+	// ScmpDatum is equivalent to scmp_datum_t.
+	ScmpDatum uint64
+
+	// ScmpArgCmp is equivalent to struct scmp_arg_cmp.
+	ScmpArgCmp struct {
+		// argument number, starting at 0
+		Arg ScmpUint
+		// the comparison op, e.g. SCMP_CMP_*
+		Op ScmpCompare
+
+		DatumA, DatumB ScmpDatum
+	}
+
+	// A NativeRule specifies an arch-specific action taken by seccomp under certain conditions.
+	NativeRule struct {
+		// Syscall is the arch-dependent syscall number to act against.
+		Syscall ScmpSyscall
+		// Errno is the errno value to return when the condition is satisfied.
+		Errno ScmpErrno
+		// Arg is the optional struct scmp_arg_cmp passed to libseccomp.
+		Arg *ScmpArgCmp
+	}
+)