#!/bin/sh
#
# Ensure that strace -k works.
#
# Copyright (c) 2014 Masatake YAMATO <yamato@redhat.com>
# Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
# Copyright (c) 2014-2020 The strace developers.
# All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0-or-later

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

: "${ATTACH_MODE=0}"

# strace -k is implemented using /proc/$pid/maps
[ -f /proc/self/maps ] ||
	framework_skip_ '/proc/self/maps is not available'

check_prog grep
check_prog readlink
check_prog sed
check_prog tr

path_to_sed="$(command -v sed)"
if [ -x "$path_to_sed" ] &&
   path_to_sed="$(readlink -ev -- "$path_to_sed")"; then
	"$path_to_sed" -n 's/^[^/]\+[[:space:]]\(\/.*\)$/\1/p' /proc/self/maps |
	grep -F -x -e "$path_to_sed" > /dev/null || {
		cat >&2 /proc/self/maps
		framework_skip_ '/proc/self/maps is invalid'
	}
fi

run_prog "${test_prog=../stack-fcall}"

if [ "x${ATTACH_MODE}" = "x1" ]; then
	../set_ptracer_any "${test_prog}" >> "$EXP" &
	tracee_pid=$!

	while ! [ -s "$EXP" ]; do
		kill -0 "$tracee_pid" 2> /dev/null ||
			fail_ 'set_ptracer_any failed'
	done

	run_strace --trace=chdir --stack-trace --attach="$tracee_pid"
else
	run_strace -e chdir -k $args
fi

expected="$srcdir/$NAME.expected"
awk '
/^[^ ]/ {
	if (out != "")
		print out

	syscall = gensub(/^([[:alnum:]_]+)\(.*/, "\\1", 1)
	signal = gensub(/^--- ([A-Z]+) .*/, "\\1", 1)

	if (syscall != $0) {
		out = syscall
		stop = 0
	} else if (signal != $0) {
		out = signal
		stop = 0
	} else {
		out = ""
	}
}

/^ >[^(]+\(([^+]+)\+0x[a-f0-9]+\) / && !stop {
	sym = gensub(/^ >[^(]+\(([^+]+)\+0x[a-f0-9]+\) .*$/, "\\1", 1)
	out = out " " sym
	if (sym == "main")
		stop = 1
}' "$LOG" > "$OUT"

LC_ALL=C grep -E -x -f "$expected" < "$OUT" > /dev/null || {
	cat >&2 <<__EOF__
Failed pattern of expected output:
$(cat "$expected")
Actual output:
$(cat "$OUT")
__EOF__

	pattern=
	case "$STRACE_ARCH" in
		aarch64|i386|ppc*|s390*|sparc*|x32|x86*)
			# These architectures are supported by elfutils libdw,
			# see grep '\<HOOK\>.*\<abi_cfi\>' elfutils/backends
			;;
		arm) pattern='No DWARF information found'
			# This is also supported by elfutils libdw
			# but the latter needs debuginfo for unwinding.
			;;
		*) pattern='Unwinding not supported for this architecture'
			;;
	esac
	if [ -n "$pattern" ] &&
	   LC_ALL=C grep -x " > $pattern" < "$LOG" > /dev/null; then
		cat < "$LOG" >&2
		skip_ "stack tracing is not fully supported on $STRACE_ARCH yet"
	fi

	dump_log_and_fail_with "$STRACE $args output mismatch"
}