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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 <gtest/gtest.h>
#include <errno.h>
#include <signal.h>
template <typename Fn>
static void TestSigSet1(Fn fn) {
// NULL sigset_t*.
sigset_t* set_ptr = NULL;
errno = 0;
ASSERT_EQ(-1, fn(set_ptr));
ASSERT_EQ(EINVAL, errno);
// Non-NULL.
sigset_t set;
errno = 0;
ASSERT_EQ(0, fn(&set));
ASSERT_EQ(0, errno);
}
template <typename Fn>
static void TestSigSet2(Fn fn) {
// NULL sigset_t*.
sigset_t* set_ptr = NULL;
errno = 0;
ASSERT_EQ(-1, fn(set_ptr, SIGSEGV));
ASSERT_EQ(EINVAL, errno);
sigset_t set;
sigemptyset(&set);
int min_signal = SIGHUP;
int max_signal = SIGRTMAX;
#if defined(__BIONIC__) && !defined(__mips__)
// bionic's sigset_t is too small for ARM and x86: 32 bits instead of 64.
// This means you can't refer to any of the real-time signals.
// See http://b/3038348 and http://b/5828899.
max_signal = 32;
#else
// Other C libraries (or bionic for MIPS) are perfectly capable of using their largest signal.
ASSERT_GE(sizeof(sigset_t) * 8, static_cast<size_t>(SIGRTMAX));
#endif
// Bad signal number: too small.
errno = 0;
ASSERT_EQ(-1, fn(&set, 0));
ASSERT_EQ(EINVAL, errno);
// Bad signal number: too high.
errno = 0;
ASSERT_EQ(-1, fn(&set, max_signal + 1));
ASSERT_EQ(EINVAL, errno);
// Good signal numbers, low and high ends of range.
errno = 0;
ASSERT_EQ(0, fn(&set, min_signal));
ASSERT_EQ(0, errno);
ASSERT_EQ(0, fn(&set, max_signal));
ASSERT_EQ(0, errno);
}
class ScopedSignalHandler {
public:
ScopedSignalHandler(int signal_number, void (*handler)(int)) : signal_number_(signal_number) {
sigemptyset(&action_.sa_mask);
action_.sa_flags = 0;
action_.sa_handler = handler;
sigaction(signal_number_, &action_, &old_action_);
}
~ScopedSignalHandler() {
sigaction(signal_number_, &old_action_, NULL);
}
private:
struct sigaction action_;
struct sigaction old_action_;
const int signal_number_;
};
TEST(signal, sigismember_invalid) {
TestSigSet2(sigismember);
}
TEST(signal, sigaddset_invalid) {
TestSigSet2(sigaddset);
}
TEST(signal, sigdelset_invalid) {
TestSigSet2(sigdelset);
}
TEST(signal, sigemptyset_invalid) {
TestSigSet1(sigemptyset);
}
TEST(signal, sigfillset_invalid) {
TestSigSet1(sigfillset);
}
TEST(signal, raise_invalid) {
errno = 0;
ASSERT_EQ(-1, raise(-1));
ASSERT_EQ(EINVAL, errno);
}
static void raise_in_signal_handler_helper(int signal_number) {
ASSERT_EQ(SIGALRM, signal_number);
static int count = 0;
if (++count == 1) {
raise(SIGALRM);
}
}
TEST(signal, raise_in_signal_handler) {
ScopedSignalHandler ssh(SIGALRM, raise_in_signal_handler_helper);
raise(SIGALRM);
}
static void HandleSIGALRM(int signal_number) {
ASSERT_EQ(SIGALRM, signal_number);
}
TEST(signal, sigwait) {
ScopedSignalHandler ssh(SIGALRM, HandleSIGALRM);
sigset_t wait_set;
sigemptyset(&wait_set);
sigaddset(&wait_set, SIGALRM);
alarm(1);
int received_signal;
errno = 0;
ASSERT_EQ(0, sigwait(&wait_set, &received_signal));
ASSERT_EQ(0, errno);
ASSERT_EQ(SIGALRM, received_signal);
}
static int gSigSuspendTestHelperCallCount = 0;
static void SigSuspendTestHelper(int) {
++gSigSuspendTestHelperCallCount;
}
TEST(signal, sigsuspend) {
ScopedSignalHandler ssh(SIGALRM, SigSuspendTestHelper);
// Block SIGALRM.
sigset_t just_SIGALRM;
sigemptyset(&just_SIGALRM);
sigaddset(&just_SIGALRM, SIGALRM);
sigset_t original_set;
ASSERT_EQ(0, sigprocmask(SIG_BLOCK, &just_SIGALRM, &original_set));
// Raise SIGALRM and check our signal handler wasn't called.
raise(SIGALRM);
ASSERT_EQ(0, gSigSuspendTestHelperCallCount);
// Use sigsuspend to block everything except SIGALRM...
sigset_t not_SIGALRM;
sigfillset(¬_SIGALRM);
sigdelset(¬_SIGALRM, SIGALRM);
ASSERT_EQ(-1, sigsuspend(¬_SIGALRM));
ASSERT_EQ(EINTR, errno);
// ...and check that we now receive our pending SIGALRM.
ASSERT_EQ(1, gSigSuspendTestHelperCallCount);
// Restore the original set.
assert(0 == sigprocmask(SIG_SETMASK, &original_set, NULL));
}
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