2 * Copyright (C) 2012 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <sys/syscall.h>
20 #include <sys/types.h>
23 #include <gtest/gtest.h>
25 #include "ScopedSignalHandler.h"
27 static size_t SIGNAL_MIN() {
28 return 1; // Signals start at 1 (SIGHUP), not 0.
31 static size_t SIGNAL_MAX() {
32 size_t result = SIGRTMAX;
34 #if defined(__BIONIC__) && !defined(__mips__) && !defined(__LP64__)
35 // 32-bit bionic's sigset_t is too small for ARM and x86: 32 bits instead of 64.
36 // This means you can't refer to any of the real-time signals.
37 // See http://b/3038348 and http://b/5828899.
40 // Otherwise, C libraries should be perfectly capable of using their largest signal.
41 if (sizeof(sigset_t) * 8 < static_cast<size_t>(SIGRTMAX)) {
49 template <typename Fn>
50 static void TestSigSet1(Fn fn) {
52 sigset_t* set_ptr = NULL;
54 ASSERT_EQ(-1, fn(set_ptr));
55 ASSERT_EQ(EINVAL, errno);
60 ASSERT_EQ(0, fn(&set));
64 template <typename Fn>
65 static void TestSigSet2(Fn fn) {
67 sigset_t* set_ptr = NULL;
69 ASSERT_EQ(-1, fn(set_ptr, SIGSEGV));
70 ASSERT_EQ(EINVAL, errno);
75 // Bad signal number: too small.
77 ASSERT_EQ(-1, fn(&set, 0));
78 ASSERT_EQ(EINVAL, errno);
80 // Bad signal number: too high.
82 ASSERT_EQ(-1, fn(&set, SIGNAL_MAX() + 1));
83 ASSERT_EQ(EINVAL, errno);
85 // Good signal numbers, low and high ends of range.
87 ASSERT_EQ(0, fn(&set, SIGNAL_MIN()));
89 ASSERT_EQ(0, fn(&set, SIGNAL_MAX()));
93 TEST(signal, sigismember_invalid) {
94 TestSigSet2(sigismember);
97 TEST(signal, sigaddset_invalid) {
98 TestSigSet2(sigaddset);
101 TEST(signal, sigdelset_invalid) {
102 TestSigSet2(sigdelset);
105 TEST(signal, sigemptyset_invalid) {
106 TestSigSet1(sigemptyset);
109 TEST(signal, sigfillset_invalid) {
110 TestSigSet1(sigfillset);
113 TEST(signal, raise_invalid) {
115 ASSERT_EQ(-1, raise(-1));
116 ASSERT_EQ(EINVAL, errno);
119 static void raise_in_signal_handler_helper(int signal_number) {
120 ASSERT_EQ(SIGALRM, signal_number);
121 static int count = 0;
127 TEST(signal, raise_in_signal_handler) {
128 ScopedSignalHandler ssh(SIGALRM, raise_in_signal_handler_helper);
132 static void HandleSIGALRM(int signal_number) {
133 ASSERT_EQ(SIGALRM, signal_number);
136 TEST(signal, sigwait) {
137 ScopedSignalHandler ssh(SIGALRM, HandleSIGALRM);
140 sigemptyset(&wait_set);
141 sigaddset(&wait_set, SIGALRM);
147 ASSERT_EQ(0, sigwait(&wait_set, &received_signal));
149 ASSERT_EQ(SIGALRM, received_signal);
152 static int g_sigsuspend_test_helper_call_count = 0;
154 static void SigSuspendTestHelper(int) {
155 ++g_sigsuspend_test_helper_call_count;
158 TEST(signal, sigsuspend_sigpending) {
160 sigset_t just_SIGALRM;
161 sigemptyset(&just_SIGALRM);
162 sigaddset(&just_SIGALRM, SIGALRM);
163 sigset_t original_set;
164 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &just_SIGALRM, &original_set));
166 ScopedSignalHandler ssh(SIGALRM, SigSuspendTestHelper);
168 // There should be no pending signals.
170 sigemptyset(&pending);
171 ASSERT_EQ(0, sigpending(&pending));
172 for (size_t i = SIGNAL_MIN(); i <= SIGNAL_MAX(); ++i) {
173 EXPECT_FALSE(sigismember(&pending, i)) << i;
176 // Raise SIGALRM and check our signal handler wasn't called.
178 ASSERT_EQ(0, g_sigsuspend_test_helper_call_count);
180 // We should now have a pending SIGALRM but nothing else.
181 sigemptyset(&pending);
182 ASSERT_EQ(0, sigpending(&pending));
183 for (size_t i = SIGNAL_MIN(); i <= SIGNAL_MAX(); ++i) {
184 EXPECT_EQ((i == SIGALRM), sigismember(&pending, i));
187 // Use sigsuspend to block everything except SIGALRM...
188 sigset_t not_SIGALRM;
189 sigfillset(¬_SIGALRM);
190 sigdelset(¬_SIGALRM, SIGALRM);
191 ASSERT_EQ(-1, sigsuspend(¬_SIGALRM));
192 ASSERT_EQ(EINTR, errno);
193 // ...and check that we now receive our pending SIGALRM.
194 ASSERT_EQ(1, g_sigsuspend_test_helper_call_count);
196 // Restore the original set.
197 ASSERT_EQ(0, sigprocmask(SIG_SETMASK, &original_set, NULL));
200 static void EmptySignalHandler(int) {}
201 static void EmptySignalAction(int, siginfo_t*, void*) {}
203 TEST(signal, sigaction) {
204 // Both bionic and glibc set SA_RESTORER when talking to the kernel on arm,
205 // arm64, x86, and x86-64. The version of glibc we're using also doesn't
206 // define SA_RESTORER, but luckily it's the same value everywhere, and mips
207 // doesn't use the bit for anything.
208 static const unsigned sa_restorer = 0x4000000;
210 // See what's currently set for SIGALRM.
211 struct sigaction original_sa;
212 memset(&original_sa, 0, sizeof(original_sa));
213 ASSERT_EQ(0, sigaction(SIGALRM, NULL, &original_sa));
214 ASSERT_TRUE(original_sa.sa_handler == NULL);
215 ASSERT_TRUE(original_sa.sa_sigaction == NULL);
216 ASSERT_EQ(0U, original_sa.sa_flags & ~sa_restorer);
218 // Set a traditional sa_handler signal handler.
220 memset(&sa, 0, sizeof(sa));
221 sigaddset(&sa.sa_mask, SIGALRM);
222 sa.sa_flags = SA_ONSTACK;
223 sa.sa_handler = EmptySignalHandler;
224 ASSERT_EQ(0, sigaction(SIGALRM, &sa, NULL));
226 // Check that we can read it back.
227 memset(&sa, 0, sizeof(sa));
228 ASSERT_EQ(0, sigaction(SIGALRM, NULL, &sa));
229 ASSERT_TRUE(sa.sa_handler == EmptySignalHandler);
230 ASSERT_TRUE((void*) sa.sa_sigaction == (void*) sa.sa_handler);
231 ASSERT_EQ(static_cast<unsigned>(SA_ONSTACK), sa.sa_flags & ~sa_restorer);
233 // Set a new-style sa_sigaction signal handler.
234 memset(&sa, 0, sizeof(sa));
235 sigaddset(&sa.sa_mask, SIGALRM);
236 sa.sa_flags = SA_ONSTACK | SA_SIGINFO;
237 sa.sa_sigaction = EmptySignalAction;
238 ASSERT_EQ(0, sigaction(SIGALRM, &sa, NULL));
240 // Check that we can read it back.
241 memset(&sa, 0, sizeof(sa));
242 ASSERT_EQ(0, sigaction(SIGALRM, NULL, &sa));
243 ASSERT_TRUE(sa.sa_sigaction == EmptySignalAction);
244 ASSERT_TRUE((void*) sa.sa_sigaction == (void*) sa.sa_handler);
245 ASSERT_EQ(static_cast<unsigned>(SA_ONSTACK | SA_SIGINFO), sa.sa_flags & ~sa_restorer);
247 // Put everything back how it was.
248 ASSERT_EQ(0, sigaction(SIGALRM, &original_sa, NULL));
251 TEST(signal, sys_signame) {
252 #if defined(__BIONIC__)
253 ASSERT_TRUE(sys_signame[0] == NULL);
254 ASSERT_STREQ("HUP", sys_signame[SIGHUP]);
256 GTEST_LOG_(INFO) << "This test does nothing.\n";
260 TEST(signal, sys_siglist) {
261 ASSERT_TRUE(sys_siglist[0] == NULL);
262 ASSERT_STREQ("Hangup", sys_siglist[SIGHUP]);
265 TEST(signal, limits) {
266 // This comes from the kernel.
267 ASSERT_EQ(32, __SIGRTMIN);
269 // We reserve a non-zero number at the bottom for ourselves.
270 ASSERT_GT(SIGRTMIN, __SIGRTMIN);
272 // MIPS has more signals than everyone else.
273 #if defined(__mips__)
274 ASSERT_EQ(128, __SIGRTMAX);
276 ASSERT_EQ(64, __SIGRTMAX);
279 // We don't currently reserve any at the top.
280 ASSERT_EQ(SIGRTMAX, __SIGRTMAX);
283 static int g_sigqueue_signal_handler_call_count = 0;
285 static void SigqueueSignalHandler(int signum, siginfo_t* info, void*) {
286 ASSERT_EQ(SIGALRM, signum);
287 ASSERT_EQ(SIGALRM, info->si_signo);
288 ASSERT_EQ(SI_QUEUE, info->si_code);
289 ASSERT_EQ(1, info->si_value.sival_int);
290 ++g_sigqueue_signal_handler_call_count;
293 TEST(signal, sigqueue) {
294 ScopedSignalHandler ssh(SIGALRM, SigqueueSignalHandler, SA_SIGINFO);
296 sigval.sival_int = 1;
298 ASSERT_EQ(0, sigqueue(getpid(), SIGALRM, sigval));
300 ASSERT_EQ(1, g_sigqueue_signal_handler_call_count);
303 TEST(signal, sigwaitinfo) {
305 sigset_t just_SIGALRM;
306 sigemptyset(&just_SIGALRM);
307 sigaddset(&just_SIGALRM, SIGALRM);
308 sigset_t original_set;
309 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &just_SIGALRM, &original_set));
313 sigval.sival_int = 1;
314 ASSERT_EQ(0, sigqueue(getpid(), SIGALRM, sigval));
316 // Get pending SIGALRM.
319 ASSERT_EQ(SIGALRM, sigwaitinfo(&just_SIGALRM, &info));
321 ASSERT_EQ(SIGALRM, info.si_signo);
322 ASSERT_EQ(1, info.si_value.sival_int);
324 ASSERT_EQ(0, sigprocmask(SIG_SETMASK, &original_set, NULL));
327 TEST(signal, sigtimedwait) {
329 sigset_t just_SIGALRM;
330 sigemptyset(&just_SIGALRM);
331 sigaddset(&just_SIGALRM, SIGALRM);
332 sigset_t original_set;
333 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &just_SIGALRM, &original_set));
337 sigval.sival_int = 1;
338 ASSERT_EQ(0, sigqueue(getpid(), SIGALRM, sigval));
340 // Get pending SIGALRM.
342 struct timespec timeout;
346 ASSERT_EQ(SIGALRM, sigtimedwait(&just_SIGALRM, &info, &timeout));
349 ASSERT_EQ(0, sigprocmask(SIG_SETMASK, &original_set, NULL));
352 static int64_t NanoTime() {
354 t.tv_sec = t.tv_nsec = 0;
355 clock_gettime(CLOCK_MONOTONIC, &t);
356 return static_cast<int64_t>(t.tv_sec) * 1000000000LL + t.tv_nsec;
359 TEST(signal, sigtimedwait_timeout) {
361 sigset_t just_SIGALRM;
362 sigemptyset(&just_SIGALRM);
363 sigaddset(&just_SIGALRM, SIGALRM);
364 sigset_t original_set;
365 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &just_SIGALRM, &original_set));
368 int64_t start_time = NanoTime();
370 struct timespec timeout;
372 timeout.tv_nsec = 1000000;
374 ASSERT_EQ(-1, sigtimedwait(&just_SIGALRM, &info, &timeout));
375 ASSERT_EQ(EAGAIN, errno);
376 ASSERT_GE(NanoTime() - start_time, 1000000);
378 ASSERT_EQ(0, sigprocmask(SIG_SETMASK, &original_set, NULL));
381 #if defined(__BIONIC__)
382 TEST(signal, rt_tgsigqueueinfo) {
383 // Test whether rt_tgsigqueueinfo allows sending arbitrary si_code values to self.
384 // If this fails, your kernel needs commit 66dd34a to be backported.
385 static constexpr char error_msg[] =
386 "\nPlease ensure that the following kernel patch has been applied:\n"
387 "* https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=66dd34ad31e5963d72a700ec3f2449291d322921\n";
388 static siginfo received;
390 struct sigaction handler;
391 memset(&handler, 0, sizeof(handler));
392 handler.sa_sigaction = [](int, siginfo_t* siginfo, void*) { received = *siginfo; };
393 handler.sa_flags = SA_SIGINFO;
395 ASSERT_EQ(0, sigaction(SIGUSR1, &handler, nullptr));
398 memset(&sent, 0, sizeof(sent));
400 sent.si_code = SI_TKILL;
401 ASSERT_EQ(0, syscall(SYS_rt_tgsigqueueinfo, getpid(), gettid(), SIGUSR1, &sent))
402 << "rt_tgsigqueueinfo failed: " << strerror(errno) << error_msg;
403 ASSERT_EQ(sent.si_code, received.si_code) << "rt_tgsigqueueinfo modified si_code, expected "
404 << sent.si_code << ", received " << received.si_code
407 sent.si_code = SI_USER;
408 ASSERT_EQ(0, syscall(SYS_rt_tgsigqueueinfo, getpid(), gettid(), SIGUSR1, &sent))
409 << "rt_tgsigqueueinfo failed: " << strerror(errno) << error_msg;
410 ASSERT_EQ(sent.si_code, received.si_code) << "rt_tgsigqueueinfo modified si_code, expected "
411 << sent.si_code << ", received " << received.si_code
415 #if defined(__arm__) || defined(__aarch64__) || defined(__i386__) || defined(__x86_64__)
416 TEST(signal, sigset_size) {
417 // The setjmp implementations for ARM, AArch64, x86, and x86_64 assume that sigset_t can fit in a
418 // long. This is true because ARM and x86 have broken rt signal support, and AArch64 and x86_64
419 // both have a SIGRTMAX defined as 64.
420 static_assert(sizeof(sigset_t) <= sizeof(long), "sigset_t doesn't fit in a long");
426 TEST(signal, sigignore_EINVAL) {
428 ASSERT_EQ(-1, sigignore(99999));
429 ASSERT_EQ(EINVAL, errno);
432 TEST(signal, sigignore) {
434 EXPECT_EQ(-1, sigignore(SIGKILL));
435 EXPECT_EQ(errno, EINVAL);
438 EXPECT_EQ(-1, sigignore(SIGSTOP));
439 EXPECT_EQ(errno, EINVAL);
441 ScopedSignalHandler sigalrm{SIGALRM};
442 ASSERT_EQ(0, sigignore(SIGALRM));
445 ASSERT_EQ(0, sigaction(SIGALRM, nullptr, &sa));
446 EXPECT_EQ(SIG_IGN, sa.sa_handler);
449 TEST(signal, sighold_EINVAL) {
451 ASSERT_EQ(-1, sighold(99999));
452 ASSERT_EQ(EINVAL, errno);
455 TEST(signal, sigpause_EINVAL) {
457 ASSERT_EQ(-1, sigpause(99999));
458 ASSERT_EQ(EINVAL, errno);
461 TEST(signal, sigrelse_EINVAL) {
463 ASSERT_EQ(-1, sigpause(99999));
464 ASSERT_EQ(EINVAL, errno);
467 TEST(signal, sighold_sigpause_sigrelse) {
468 static int sigalrm_handler_call_count;
469 auto sigalrm_handler = [](int) { sigalrm_handler_call_count++; };
470 ScopedSignalHandler sigalrm{SIGALRM, sigalrm_handler};
471 ScopedSignalMask mask;
474 // sighold(SIGALRM) should add SIGALRM to the signal mask ...
475 ASSERT_EQ(0, sighold(SIGALRM));
476 ASSERT_EQ(0, sigprocmask(SIG_SETMASK, 0, &set));
477 EXPECT_TRUE(sigismember(&set, SIGALRM));
479 // ... preventing our SIGALRM handler from running ...
481 ASSERT_EQ(0, sigalrm_handler_call_count);
482 // ... until sigpause(SIGALRM) temporarily unblocks it.
483 ASSERT_EQ(-1, sigpause(SIGALRM));
484 ASSERT_EQ(EINTR, errno);
485 ASSERT_EQ(1, sigalrm_handler_call_count);
487 // But sigpause(SIGALRM) shouldn't permanently unblock SIGALRM.
488 ASSERT_EQ(0, sigprocmask(SIG_SETMASK, 0, &set));
489 EXPECT_TRUE(sigismember(&set, SIGALRM));
491 ASSERT_EQ(0, sigrelse(SIGALRM));
492 ASSERT_EQ(0, sigprocmask(SIG_SETMASK, 0, &set));
493 EXPECT_FALSE(sigismember(&set, SIGALRM));
496 TEST(signal, sigset_EINVAL) {
498 ASSERT_EQ(SIG_ERR, sigset(99999, SIG_DFL));
499 ASSERT_EQ(EINVAL, errno);
502 TEST(signal, sigset) {
503 auto sigalrm_handler = [](int) { };
504 ScopedSignalHandler sigalrm{SIGALRM, sigalrm_handler};
505 ScopedSignalMask mask;
507 // block SIGALRM so the next sigset(SIGARLM) call will return SIG_HOLD
508 sigset_t sigalrm_set;
509 sigemptyset(&sigalrm_set);
510 sigaddset(&sigalrm_set, SIGALRM);
511 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &sigalrm_set, nullptr));
514 ASSERT_EQ(SIG_HOLD, sigset(SIGALRM, sigalrm_handler));
515 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, nullptr, &set));
516 EXPECT_FALSE(sigismember(&set, SIGALRM));
518 ASSERT_EQ(sigalrm_handler, sigset(SIGALRM, SIG_IGN));
519 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, nullptr, &set));
520 EXPECT_FALSE(sigismember(&set, SIGALRM));
522 ASSERT_EQ(SIG_IGN, sigset(SIGALRM, SIG_DFL));
523 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, nullptr, &set));
524 EXPECT_FALSE(sigismember(&set, SIGALRM));
526 ASSERT_EQ(SIG_DFL, sigset(SIGALRM, SIG_HOLD));
527 ASSERT_EQ(0, sigprocmask(SIG_BLOCK, nullptr, &set));
528 EXPECT_TRUE(sigismember(&set, SIGALRM));