From: Masami Hiramatsu (Google) mhiramat@kernel.org
Add a testcase for poll() on hist file. This introduces a helper binary to the ftracetest, because there is no good way to reliably execute poll() on hist file.
Signed-off-by: Masami Hiramatsu (Google) mhiramat@kernel.org --- tools/testing/selftests/ftrace/Makefile | 3 + tools/testing/selftests/ftrace/poll.c | 34 +++++++++++++++ .../ftrace/test.d/trigger/trigger-hist-poll.tc | 46 ++++++++++++++++++++ 3 files changed, 83 insertions(+) create mode 100644 tools/testing/selftests/ftrace/poll.c create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc
diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile index a1e955d2de4c..830b2299ea27 100644 --- a/tools/testing/selftests/ftrace/Makefile +++ b/tools/testing/selftests/ftrace/Makefile @@ -6,4 +6,7 @@ TEST_PROGS := ftracetest-ktap TEST_FILES := test.d settings EXTRA_CLEAN := $(OUTPUT)/logs/*
+LDFLAGS += -static +TEST_GEN_PROGS = poll + include ../lib.mk diff --git a/tools/testing/selftests/ftrace/poll.c b/tools/testing/selftests/ftrace/poll.c new file mode 100644 index 000000000000..800d1114629c --- /dev/null +++ b/tools/testing/selftests/ftrace/poll.c @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Simple poll on a file. + * + * Copyright (c) 2024 Google LLC. + */ + +#include <fcntl.h> +#include <poll.h> +#include <stdio.h> +#include <unistd.h> + +#define BUFSIZE 4096 + +int main(int argc, char *argv[]) +{ + struct pollfd pfd = {.events = POLLPRI}; + char buf[BUFSIZE]; + + if (argc < 2) + return -1; + pfd.fd = open(argv[1], O_RDONLY); + if (pfd.fd < 0) { + perror("open"); + return -1; + } + + if (poll(&pfd, 1, -1) < 0) { + perror("poll"); + return -1; + } + close(pfd.fd); + return 0; +} diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc new file mode 100644 index 000000000000..ac3999dee40b --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc @@ -0,0 +1,46 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: event trigger - test poll wait on histogram +# requires: set_event events/sched/sched_process_free/trigger events/sched/sched_process_free/hist +# flags: instance + +POLL=${FTRACETEST_ROOT}/poll + +if [ ! -x ${POLL} ]; then + echo "poll program is not compiled!" + exit_unresolved +fi + +EVENT=events/sched/sched_process_free/ + +echo "hist:key=comm" > ${EVENT}/trigger +echo 1 > ${EVENT}/enable + +# setting timeout +PID=$$ +SIG_FAIL=37 +trap exit_fail $SIG_FAIL +sleep 10 && (kill -s ${SIG_FAIL} ${PID} ||:) & +TOPID=$! + +# sleep command will exit after 2 seconds +sleep 2 & +BGPID=$! +${POLL} ${EVENT}/hist +# stop timeout +kill -KILL ${TOPID} ||: + +cat trace > ${TMPDIR}/trace + +if [ -d /proc/${BGPID} ]; then + echo "poll exits too soon" + kill -KILL ${BGPID} ||: + exit_fail +fi + +if ! grep -qw "sleep" ${TMPDIR}/trace; then + echo "poll exits before event happens" + exit_fail +fi + +exit_pass