Make the kselftest harness compatible with nolibc which does not implement signals by replacing the signal logic with pidfds. The code also becomes simpler.
Signed-off-by: Thomas Weißschuh thomas.weissschuh@linutronix.de Acked-by: Shuah Khan skhan@linuxfoundation.org --- tools/testing/selftests/kselftest_harness.h | 72 ++++++++++------------------- 1 file changed, 25 insertions(+), 47 deletions(-)
diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h index 7ec4f66d0e3d7f129f6c2a45ff58310dabe5d03f..1e459619fe8657d7d213a7b16d7bcbc58e76e892 100644 --- a/tools/testing/selftests/kselftest_harness.h +++ b/tools/testing/selftests/kselftest_harness.h @@ -56,6 +56,8 @@ #include <asm/types.h> #include <ctype.h> #include <errno.h> +#include <linux/unistd.h> +#include <poll.h> #include <stdbool.h> #include <stdint.h> #include <stdio.h> @@ -914,7 +916,6 @@ struct __test_metadata { int exit_code; int trigger; /* extra handler after the evaluation */ int timeout; /* seconds to wait for test timeout */ - bool timed_out; /* did this test timeout instead of exiting? */ bool aborted; /* stopped test due to failed ASSERT */ bool setup_completed; /* did setup finish? */ jmp_buf env; /* for exiting out of test early */ @@ -964,75 +965,52 @@ static inline void __test_check_assert(struct __test_metadata *t) abort(); }
-struct __test_metadata *__active_test; -static void __timeout_handler(int sig, siginfo_t *info, void *ucontext) -{ - struct __test_metadata *t = __active_test; - - /* Sanity check handler execution environment. */ - if (!t) { - fprintf(TH_LOG_STREAM, - "# no active test in SIGALRM handler!?\n"); - abort(); - } - if (sig != SIGALRM || sig != info->si_signo) { - fprintf(TH_LOG_STREAM, - "# %s: SIGALRM handler caught signal %d!?\n", - t->name, sig != SIGALRM ? sig : info->si_signo); - abort(); - } - - t->timed_out = true; - /* signal process group */ - kill(-(t->pid), SIGKILL); -} - static void __wait_for_test(struct __test_metadata *t) { - struct sigaction action = { - .sa_sigaction = __timeout_handler, - .sa_flags = SA_SIGINFO, - }; - struct sigaction saved_action; /* * Sets status so that WIFEXITED(status) returns true and * WEXITSTATUS(status) returns KSFT_FAIL. This safe default value * should never be evaluated because of the waitpid(2) check and - * SIGALRM handling. + * timeout handling. */ int status = KSFT_FAIL << 8; - int child; + struct pollfd poll_child; + int ret, child, childfd; + bool timed_out = false;
- if (sigaction(SIGALRM, &action, &saved_action)) { + childfd = syscall(__NR_pidfd_open, t->pid, 0); + if (childfd == -1) { t->exit_code = KSFT_FAIL; fprintf(TH_LOG_STREAM, - "# %s: unable to install SIGALRM handler\n", + "# %s: unable to open pidfd\n", t->name); return; } - __active_test = t; - t->timed_out = false; - alarm(t->timeout); - child = waitpid(t->pid, &status, 0); - if (child == -1 && errno != EINTR) { + + poll_child.fd = childfd; + poll_child.events = POLLIN; + ret = poll(&poll_child, 1, t->timeout * 1000); + if (ret == -1) { t->exit_code = KSFT_FAIL; fprintf(TH_LOG_STREAM, - "# %s: Failed to wait for PID %d (errno: %d)\n", - t->name, t->pid, errno); + "# %s: unable to wait on child pidfd\n", + t->name); return; + } else if (ret == 0) { + timed_out = true; + /* signal process group */ + kill(-(t->pid), SIGKILL); } - - alarm(0); - if (sigaction(SIGALRM, &saved_action, NULL)) { + child = waitpid(t->pid, &status, WNOHANG); + if (child == -1 && errno != EINTR) { t->exit_code = KSFT_FAIL; fprintf(TH_LOG_STREAM, - "# %s: unable to uninstall SIGALRM handler\n", - t->name); + "# %s: Failed to wait for PID %d (errno: %d)\n", + t->name, t->pid, errno); return; } - __active_test = NULL;
- if (t->timed_out) { + if (timed_out) { t->exit_code = KSFT_FAIL; fprintf(TH_LOG_STREAM, "# %s: Test terminated by timeout\n", t->name);