#!/bin/sh -efu
#
# Check -D option.
#
# Copyright (c) 2019 Dmitry V. Levin <ldv@altlinux.org>
# All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0-or-later

. "${srcdir=.}/init.sh"

check_prog sed

get_parent_pid()
{
	sed '/^PPid:[[:space:]]*/!d;s///'
}

get_tracer_pid()
{
	sed '/^TracerPid:[[:space:]]*/!d;s///'
}

status_file=/proc/self/status
[ -f "$status_file" ] ||
	framework_skip_ "$status_file is not available"

set -- sed -r -n '/^(P|Tracer)Pid:/p' "$status_file"
"$@" > "$LOG" ||
	framework_skip_ "$* does not work"

# not traced: PPid > 0, TracerPid == 0
[ "$(get_parent_pid < "$LOG")" -gt 0 ] &&
[ "$(get_tracer_pid < "$LOG")" -eq 0 ] ||
	dump_log_and_fail_with "$*: unexpected output"

# !-D: PPid > 0, TracerPid > 0, PPid == TracerPid
run_strace -q -enone "$@" > "$OUT"
[ "$(get_parent_pid < "$OUT")" -gt 0 ] &&
[ "$(get_tracer_pid < "$OUT")" -gt 0 ] &&
[ "$(get_parent_pid < "$OUT")" = "$(get_tracer_pid < "$OUT")" ] || {
	cat < "$OUT" > "$LOG"
	dump_log_and_fail_with "$STRACE $args: unexpected output"
}
match_diff

test_parent_tracer_pid()
{
	local d
	d="$1"; shift

	# -D/-DD/-DDD: PPid > 0, TracerPid > 0, PPid != TracerPid
	run_strace $d -q -enone "$@" > "$OUT"
	[ "$(get_parent_pid < "$OUT")" -gt 0 ] &&
	[ "$(get_tracer_pid < "$OUT")" -gt 0 ] &&
	[ "$(get_parent_pid < "$OUT")" != "$(get_tracer_pid < "$OUT")" ] || {
		cat < "$OUT" > "$LOG"
		dump_log_and_fail_with "$STRACE $args: unexpected output"
	}
	match_diff
}

test_parent_tracer_pid -D "$@"
test_parent_tracer_pid -DD "$@"
test_parent_tracer_pid -DDD "$@"