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/*
* Copyright (C) 2017 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.
*/
#ifndef _LIBUNWINDSTACK_TESTS_TEST_UTILS_H
#define _LIBUNWINDSTACK_TESTS_TEST_UTILS_H
#include <errno.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
namespace unwindstack {
class TestScopedPidReaper {
public:
TestScopedPidReaper(pid_t pid) : pid_(pid) {}
~TestScopedPidReaper() {
kill(pid_, SIGKILL);
waitpid(pid_, nullptr, 0);
}
private:
pid_t pid_;
};
inline bool TestQuiescePid(pid_t pid) {
siginfo_t si;
// Wait for up to 10 seconds.
for (size_t i = 0; i < 10000; i++) {
if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si) == 0) {
return true;
}
if (errno != ESRCH) {
if (errno == EINVAL) {
// The process is in group-stop state, so try and kick the
// process out of that state.
if (ptrace(PTRACE_LISTEN, pid, 0, 0) == -1) {
perror("ptrace listen failed.");
return false;
}
} else {
return false;
}
}
usleep(1000);
}
return false;
}
inline bool TestAttach(pid_t pid) {
// Wait up to 10 seconds to attach.
for (size_t j = 0; j < 10000; j++) {
if (ptrace(PTRACE_ATTACH, pid, 0, 0) == 0) {
break;
}
if (errno == ESRCH) {
usleep(1000);
continue;
}
perror("Failed to attach.");
return false;
}
if (TestQuiescePid(pid)) {
return true;
}
if (ptrace(PTRACE_DETACH, pid, 0, 0) == -1) {
perror("Failed to detach.");
}
return false;
}
inline bool TestDetach(pid_t pid) {
if (ptrace(PTRACE_DETACH, pid, 0, 0) == -1) {
perror("ptrace detach failed");
return false;
}
return true;
}
void TestCheckForLeaks(void (*unwind_func)(void*), void* data);
void* GetTestLibHandle();
// TODO(b/148307629): Once we incorporate google benchmark library into
// GoogleTest, we can call benchmark::DoNotOptimize here instead.
template <class Tp>
static inline void DoNotOptimize(Tp const& value) {
asm volatile("" : : "r,m"(value) : "memory");
}
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_TESTS_TEST_UTILS_H
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