// Copyright 2018 The gVisor Authors. // // 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. Regression test for b/24790092. 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