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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include <cerrno>
#include <csignal>
#include "gtest/gtest.h"
#include "test/util/logging.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
static int tkill(pid_t tid, int sig) {
int ret;
do {
// NOTE(b/25434735): tkill(2) could return EAGAIN for RT signals.
ret = syscall(SYS_tkill, tid, sig);
} while (ret == -1 && errno == EAGAIN);
return ret;
}
TEST(TkillTest, InvalidTID) {
EXPECT_THAT(tkill(-1, 0), SyscallFailsWithErrno(EINVAL));
EXPECT_THAT(tkill(0, 0), SyscallFailsWithErrno(EINVAL));
}
TEST(TkillTest, ValidTID) {
EXPECT_THAT(tkill(gettid(), 0), SyscallSucceeds());
}
void SigHandler(int sig, siginfo_t* info, void* context) {
TEST_CHECK(sig == SIGRTMAX);
TEST_CHECK(info->si_pid == getpid());
TEST_CHECK(info->si_uid == getuid());
TEST_CHECK(info->si_code == SI_TKILL);
}
// Test with a real signal.
TEST(TkillTest, ValidTIDAndRealSignal) {
struct sigaction sa;
sa.sa_sigaction = SigHandler;
sigfillset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO;
ASSERT_THAT(sigaction(SIGRTMAX, &sa, nullptr), SyscallSucceeds());
// InitGoogle blocks all RT signals, so we need undo it.
sigset_t unblock;
sigemptyset(&unblock);
sigaddset(&unblock, SIGRTMAX);
ASSERT_THAT(sigprocmask(SIG_UNBLOCK, &unblock, nullptr), SyscallSucceeds());
EXPECT_THAT(tkill(gettid(), SIGRTMAX), SyscallSucceeds());
}
} // namespace
} // namespace testing
} // namespace gvisor
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