1 // Copyright 2005, Google Inc.
2 // All rights reserved.
3 //
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5 // modification, are permitted provided that the following conditions are
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7 //
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17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 //
30 // Author: wan@google.com (Zhanyong Wan), vladl@google.com (Vlad Losev)
31 //
32 // This file implements death tests.
33
34 #include "gtest/gtest-death-test.h"
35 #include "gtest/internal/gtest-port.h"
36
37 #if GTEST_HAS_DEATH_TEST
38
39 # if GTEST_OS_MAC
40 # include <crt_externs.h>
41 # endif // GTEST_OS_MAC
42
43 # include <errno.h>
44 # include <fcntl.h>
45 # include <limits.h>
46
47 # if GTEST_OS_LINUX
48 # include <signal.h>
49 # endif // GTEST_OS_LINUX
50
51 # include <stdarg.h>
52
53 # if GTEST_OS_WINDOWS
54 # include <windows.h>
55 # else
56 # include <sys/mman.h>
57 # include <sys/wait.h>
58 # endif // GTEST_OS_WINDOWS
59
60 # if GTEST_OS_QNX
61 # include <spawn.h>
62 # endif // GTEST_OS_QNX
63
64 #endif // GTEST_HAS_DEATH_TEST
65
66 #include "gtest/gtest-message.h"
67 #include "gtest/internal/gtest-string.h"
68
69 // Indicates that this translation unit is part of Google Test's
70 // implementation. It must come before gtest-internal-inl.h is
71 // included, or there will be a compiler error. This trick is to
72 // prevent a user from accidentally including gtest-internal-inl.h in
73 // his code.
74 #define GTEST_IMPLEMENTATION_ 1
75 #include "src/gtest-internal-inl.h"
76 #undef GTEST_IMPLEMENTATION_
77
78 namespace testing {
79
80 // Constants.
81
82 // The default death test style.
83 static const char kDefaultDeathTestStyle[] = "fast";
84
85 GTEST_DEFINE_string_(
86 death_test_style,
87 internal::StringFromGTestEnv("death_test_style", kDefaultDeathTestStyle),
88 "Indicates how to run a death test in a forked child process: "
89 "\"threadsafe\" (child process re-executes the test binary "
90 "from the beginning, running only the specific death test) or "
91 "\"fast\" (child process runs the death test immediately "
92 "after forking).");
93
94 GTEST_DEFINE_bool_(
95 death_test_use_fork,
96 internal::BoolFromGTestEnv("death_test_use_fork", false),
97 "Instructs to use fork()/_exit() instead of clone() in death tests. "
98 "Ignored and always uses fork() on POSIX systems where clone() is not "
99 "implemented. Useful when running under valgrind or similar tools if "
100 "those do not support clone(). Valgrind 3.3.1 will just fail if "
101 "it sees an unsupported combination of clone() flags. "
102 "It is not recommended to use this flag w/o valgrind though it will "
103 "work in 99% of the cases. Once valgrind is fixed, this flag will "
104 "most likely be removed.");
105
106 namespace internal {
107 GTEST_DEFINE_string_(
108 internal_run_death_test, "",
109 "Indicates the file, line number, temporal index of "
110 "the single death test to run, and a file descriptor to "
111 "which a success code may be sent, all separated by "
112 "the '|' characters. This flag is specified if and only if the current "
113 "process is a sub-process launched for running a thread-safe "
114 "death test. FOR INTERNAL USE ONLY.");
115 } // namespace internal
116
117 #if GTEST_HAS_DEATH_TEST
118
119 namespace internal {
120
121 // Valid only for fast death tests. Indicates the code is running in the
122 // child process of a fast style death test.
123 static bool g_in_fast_death_test_child = false;
124
125 // Returns a Boolean value indicating whether the caller is currently
126 // executing in the context of the death test child process. Tools such as
127 // Valgrind heap checkers may need this to modify their behavior in death
128 // tests. IMPORTANT: This is an internal utility. Using it may break the
129 // implementation of death tests. User code MUST NOT use it.
130 bool InDeathTestChild() {
131 # if GTEST_OS_WINDOWS
132
133 // On Windows, death tests are thread-safe regardless of the value of the
134 // death_test_style flag.
135 return !GTEST_FLAG(internal_run_death_test).empty();
136
137 # else
138
139 if (GTEST_FLAG(death_test_style) == "threadsafe")
140 return !GTEST_FLAG(internal_run_death_test).empty();
141 else
142 return g_in_fast_death_test_child;
143 #endif
144 }
145
146 } // namespace internal
147
148 // ExitedWithCode constructor.
149 ExitedWithCode::ExitedWithCode(int exit_code) : exit_code_(exit_code) {
150 }
151
152 // ExitedWithCode function-call operator.
153 bool ExitedWithCode::operator()(int exit_status) const {
154 # if GTEST_OS_WINDOWS
155
156 return exit_status == exit_code_;
157
158 # else
159
160 return WIFEXITED(exit_status) && WEXITSTATUS(exit_status) == exit_code_;
161
162 # endif // GTEST_OS_WINDOWS
163 }
164
165 # if !GTEST_OS_WINDOWS
166 // KilledBySignal constructor.
167 KilledBySignal::KilledBySignal(int signum) : signum_(signum) {
168 }
169
170 // KilledBySignal function-call operator.
171 bool KilledBySignal::operator()(int exit_status) const {
172 return WIFSIGNALED(exit_status) && WTERMSIG(exit_status) == signum_;
173 }
174 # endif // !GTEST_OS_WINDOWS
175
176 namespace internal {
177
178 // Utilities needed for death tests.
179
180 // Generates a textual description of a given exit code, in the format
181 // specified by wait(2).
182 static std::string ExitSummary(int exit_code) {
183 Message m;
184
185 # if GTEST_OS_WINDOWS
186
187 m << "Exited with exit status " << exit_code;
188
189 # else
190
191 if (WIFEXITED(exit_code)) {
192 m << "Exited with exit status " << WEXITSTATUS(exit_code);
193 } else if (WIFSIGNALED(exit_code)) {
194 m << "Terminated by signal " << WTERMSIG(exit_code);
195 }
196 # ifdef WCOREDUMP
197 if (WCOREDUMP(exit_code)) {
198 m << " (core dumped)";
199 }
200 # endif
201 # endif // GTEST_OS_WINDOWS
202
203 return m.GetString();
204 }
205
206 // Returns true if exit_status describes a process that was terminated
207 // by a signal, or exited normally with a nonzero exit code.
208 bool ExitedUnsuccessfully(int exit_status) {
209 return !ExitedWithCode(0)(exit_status);
210 }
211
212 # if !GTEST_OS_WINDOWS
213 // Generates a textual failure message when a death test finds more than
214 // one thread running, or cannot determine the number of threads, prior
215 // to executing the given statement. It is the responsibility of the
216 // caller not to pass a thread_count of 1.
217 static std::string DeathTestThreadWarning(size_t thread_count) {
218 Message msg;
219 msg << "Death tests use fork(), which is unsafe particularly"
220 << " in a threaded context. For this test, " << GTEST_NAME_ << " ";
221 if (thread_count == 0)
222 msg << "couldn't detect the number of threads.";
223 else
224 msg << "detected " << thread_count << " threads.";
225 return msg.GetString();
226 }
227 # endif // !GTEST_OS_WINDOWS
228
229 // Flag characters for reporting a death test that did not die.
230 static const char kDeathTestLived = 'L';
231 static const char kDeathTestReturned = 'R';
232 static const char kDeathTestThrew = 'T';
233 static const char kDeathTestInternalError = 'I';
234
235 // An enumeration describing all of the possible ways that a death test can
236 // conclude. DIED means that the process died while executing the test
237 // code; LIVED means that process lived beyond the end of the test code;
238 // RETURNED means that the test statement attempted to execute a return
239 // statement, which is not allowed; THREW means that the test statement
240 // returned control by throwing an exception. IN_PROGRESS means the test
241 // has not yet concluded.
242 // TODO(vladl@google.com): Unify names and possibly values for
243 // AbortReason, DeathTestOutcome, and flag characters above.
244 enum DeathTestOutcome { IN_PROGRESS, DIED, LIVED, RETURNED, THREW };
245
246 // Routine for aborting the program which is safe to call from an
247 // exec-style death test child process, in which case the error
248 // message is propagated back to the parent process. Otherwise, the
249 // message is simply printed to stderr. In either case, the program
250 // then exits with status 1.
251 void DeathTestAbort(const std::string& message) {
252 // On a POSIX system, this function may be called from a threadsafe-style
253 // death test child process, which operates on a very small stack. Use
254 // the heap for any additional non-minuscule memory requirements.
255 const InternalRunDeathTestFlag* const flag =
256 GetUnitTestImpl()->internal_run_death_test_flag();
257 if (flag != NULL) {
258 FILE* parent = posix::FDOpen(flag->write_fd(), "w");
259 fputc(kDeathTestInternalError, parent);
260 fprintf(parent, "%s", message.c_str());
261 fflush(parent);
262 _exit(1);
263 } else {
264 fprintf(stderr, "%s", message.c_str());
265 fflush(stderr);
266 posix::Abort();
267 }
268 }
269
270 // A replacement for CHECK that calls DeathTestAbort if the assertion
271 // fails.
272 # define GTEST_DEATH_TEST_CHECK_(expression) \
273 do { \
274 if (!::testing::internal::IsTrue(expression)) { \
275 DeathTestAbort( \
276 ::std::string("CHECK failed: File ") + __FILE__ + ", line " \
277 + ::testing::internal::StreamableToString(__LINE__) + ": " \
278 + #expression); \
279 } \
280 } while (::testing::internal::AlwaysFalse())
281
282 // This macro is similar to GTEST_DEATH_TEST_CHECK_, but it is meant for
283 // evaluating any system call that fulfills two conditions: it must return
284 // -1 on failure, and set errno to EINTR when it is interrupted and
285 // should be tried again. The macro expands to a loop that repeatedly
286 // evaluates the expression as long as it evaluates to -1 and sets
287 // errno to EINTR. If the expression evaluates to -1 but errno is
288 // something other than EINTR, DeathTestAbort is called.
289 # define GTEST_DEATH_TEST_CHECK_SYSCALL_(expression) \
290 do { \
291 int gtest_retval; \
292 do { \
293 gtest_retval = (expression); \
294 } while (gtest_retval == -1 && errno == EINTR); \
295 if (gtest_retval == -1) { \
296 DeathTestAbort( \
297 ::std::string("CHECK failed: File ") + __FILE__ + ", line " \
298 + ::testing::internal::StreamableToString(__LINE__) + ": " \
299 + #expression + " != -1"); \
300 } \
301 } while (::testing::internal::AlwaysFalse())
302
303 // Returns the message describing the last system error in errno.
304 std::string GetLastErrnoDescription() {
305 return errno == 0 ? "" : posix::StrError(errno);
306 }
307
308 // This is called from a death test parent process to read a failure
309 // message from the death test child process and log it with the FATAL
310 // severity. On Windows, the message is read from a pipe handle. On other
311 // platforms, it is read from a file descriptor.
312 static void FailFromInternalError(int fd) {
313 Message error;
314 char buffer[256];
315 int num_read;
316
317 do {
318 while ((num_read = posix::Read(fd, buffer, 255)) > 0) {
319 buffer[num_read] = '\0';
320 error << buffer;
321 }
322 } while (num_read == -1 && errno == EINTR);
323
324 if (num_read == 0) {
325 GTEST_LOG_(FATAL) << error.GetString();
326 } else {
327 const int last_error = errno;
328 GTEST_LOG_(FATAL) << "Error while reading death test internal: "
329 << GetLastErrnoDescription() << " [" << last_error << "]";
330 }
331 }
332
333 // Death test constructor. Increments the running death test count
334 // for the current test.
335 DeathTest::DeathTest() {
336 TestInfo* const info = GetUnitTestImpl()->current_test_info();
337 if (info == NULL) {
338 DeathTestAbort("Cannot run a death test outside of a TEST or "
339 "TEST_F construct");
340 }
341 }
342
343 // Creates and returns a death test by dispatching to the current
344 // death test factory.
345 bool DeathTest::Create(const char* statement, const RE* regex,
346 const char* file, int line, DeathTest** test) {
347 return GetUnitTestImpl()->death_test_factory()->Create(
348 statement, regex, file, line, test);
349 }
350
351 const char* DeathTest::LastMessage() {
352 return last_death_test_message_.c_str();
353 }
354
355 void DeathTest::set_last_death_test_message(const std::string& message) {
356 last_death_test_message_ = message;
357 }
358
359 std::string DeathTest::last_death_test_message_;
360
361 // Provides cross platform implementation for some death functionality.
362 class DeathTestImpl : public DeathTest {
363 protected:
364 DeathTestImpl(const char* a_statement, const RE* a_regex)
365 : statement_(a_statement),
366 regex_(a_regex),
367 spawned_(false),
368 status_(-1),
369 outcome_(IN_PROGRESS),
370 read_fd_(-1),
371 write_fd_(-1) {}
372
373 // read_fd_ is expected to be closed and cleared by a derived class.
374 ~DeathTestImpl() { GTEST_DEATH_TEST_CHECK_(read_fd_ == -1); }
375
376 void Abort(AbortReason reason);
377 virtual bool Passed(bool status_ok);
378
379 const char* statement() const { return statement_; }
380 const RE* regex() const { return regex_; }
381 bool spawned() const { return spawned_; }
382 void set_spawned(bool is_spawned) { spawned_ = is_spawned; }
383 int status() const { return status_; }
384 void set_status(int a_status) { status_ = a_status; }
385 DeathTestOutcome outcome() const { return outcome_; }
386 void set_outcome(DeathTestOutcome an_outcome) { outcome_ = an_outcome; }
387 int read_fd() const { return read_fd_; }
388 void set_read_fd(int fd) { read_fd_ = fd; }
389 int write_fd() const { return write_fd_; }
390 void set_write_fd(int fd) { write_fd_ = fd; }
391
392 // Called in the parent process only. Reads the result code of the death
393 // test child process via a pipe, interprets it to set the outcome_
394 // member, and closes read_fd_. Outputs diagnostics and terminates in
395 // case of unexpected codes.
396 void ReadAndInterpretStatusByte();
397
398 private:
399 // The textual content of the code this object is testing. This class
400 // doesn't own this string and should not attempt to delete it.
401 const char* const statement_;
402 // The regular expression which test output must match. DeathTestImpl
403 // doesn't own this object and should not attempt to delete it.
404 const RE* const regex_;
405 // True if the death test child process has been successfully spawned.
406 bool spawned_;
407 // The exit status of the child process.
408 int status_;
409 // How the death test concluded.
410 DeathTestOutcome outcome_;
411 // Descriptor to the read end of the pipe to the child process. It is
412 // always -1 in the child process. The child keeps its write end of the
413 // pipe in write_fd_.
414 int read_fd_;
415 // Descriptor to the child's write end of the pipe to the parent process.
416 // It is always -1 in the parent process. The parent keeps its end of the
417 // pipe in read_fd_.
418 int write_fd_;
419 };
420
421 // Called in the parent process only. Reads the result code of the death
422 // test child process via a pipe, interprets it to set the outcome_
423 // member, and closes read_fd_. Outputs diagnostics and terminates in
424 // case of unexpected codes.
425 void DeathTestImpl::ReadAndInterpretStatusByte() {
426 char flag;
427 int bytes_read;
428
429 // The read() here blocks until data is available (signifying the
430 // failure of the death test) or until the pipe is closed (signifying
431 // its success), so it's okay to call this in the parent before
432 // the child process has exited.
433 do {
434 bytes_read = posix::Read(read_fd(), &flag, 1);
435 } while (bytes_read == -1 && errno == EINTR);
436
437 if (bytes_read == 0) {
438 set_outcome(DIED);
439 } else if (bytes_read == 1) {
440 switch (flag) {
441 case kDeathTestReturned:
442 set_outcome(RETURNED);
443 break;
444 case kDeathTestThrew:
445 set_outcome(THREW);
446 break;
447 case kDeathTestLived:
448 set_outcome(LIVED);
449 break;
450 case kDeathTestInternalError:
451 FailFromInternalError(read_fd()); // Does not return.
452 break;
453 default:
454 GTEST_LOG_(FATAL) << "Death test child process reported "
455 << "unexpected status byte ("
456 << static_cast<unsigned int>(flag) << ")";
457 }
458 } else {
459 GTEST_LOG_(FATAL) << "Read from death test child process failed: "
460 << GetLastErrnoDescription();
461 }
462 GTEST_DEATH_TEST_CHECK_SYSCALL_(posix::Close(read_fd()));
463 set_read_fd(-1);
464 }
465
466 // Signals that the death test code which should have exited, didn't.
467 // Should be called only in a death test child process.
468 // Writes a status byte to the child's status file descriptor, then
469 // calls _exit(1).
470 void DeathTestImpl::Abort(AbortReason reason) {
471 // The parent process considers the death test to be a failure if
472 // it finds any data in our pipe. So, here we write a single flag byte
473 // to the pipe, then exit.
474 const char status_ch =
475 reason == TEST_DID_NOT_DIE ? kDeathTestLived :
476 reason == TEST_THREW_EXCEPTION ? kDeathTestThrew : kDeathTestReturned;
477
478 GTEST_DEATH_TEST_CHECK_SYSCALL_(posix::Write(write_fd(), &status_ch, 1));
479 // We are leaking the descriptor here because on some platforms (i.e.,
480 // when built as Windows DLL), destructors of global objects will still
481 // run after calling _exit(). On such systems, write_fd_ will be
482 // indirectly closed from the destructor of UnitTestImpl, causing double
483 // close if it is also closed here. On debug configurations, double close
484 // may assert. As there are no in-process buffers to flush here, we are
485 // relying on the OS to close the descriptor after the process terminates
486 // when the destructors are not run.
487 _exit(1); // Exits w/o any normal exit hooks (we were supposed to crash)
488 }
489
490 // Returns an indented copy of stderr output for a death test.
491 // This makes distinguishing death test output lines from regular log lines
492 // much easier.
493 static ::std::string FormatDeathTestOutput(const ::std::string& output) {
494 ::std::string ret;
495 for (size_t at = 0; ; ) {
496 const size_t line_end = output.find('\n', at);
497 ret += "[ DEATH ] ";
498 if (line_end == ::std::string::npos) {
499 ret += output.substr(at);
500 break;
501 }
502 ret += output.substr(at, line_end + 1 - at);
503 at = line_end + 1;
504 }
505 return ret;
506 }
507
508 // Assesses the success or failure of a death test, using both private
509 // members which have previously been set, and one argument:
510 //
511 // Private data members:
512 // outcome: An enumeration describing how the death test
513 // concluded: DIED, LIVED, THREW, or RETURNED. The death test
514 // fails in the latter three cases.
515 // status: The exit status of the child process. On *nix, it is in the
516 // in the format specified by wait(2). On Windows, this is the
517 // value supplied to the ExitProcess() API or a numeric code
518 // of the exception that terminated the program.
519 // regex: A regular expression object to be applied to
520 // the test's captured standard error output; the death test
521 // fails if it does not match.
522 //
523 // Argument:
524 // status_ok: true if exit_status is acceptable in the context of
525 // this particular death test, which fails if it is false
526 //
527 // Returns true iff all of the above conditions are met. Otherwise, the
528 // first failing condition, in the order given above, is the one that is
529 // reported. Also sets the last death test message string.
530 bool DeathTestImpl::Passed(bool status_ok) {
531 if (!spawned())
532 return false;
533
534 const std::string error_message = GetCapturedStderr();
535
536 bool success = false;
537 Message buffer;
538
539 buffer << "Death test: " << statement() << "\n";
540 switch (outcome()) {
541 case LIVED:
542 buffer << " Result: failed to die.\n"
543 << " Error msg:\n" << FormatDeathTestOutput(error_message);
544 break;
545 case THREW:
546 buffer << " Result: threw an exception.\n"
547 << " Error msg:\n" << FormatDeathTestOutput(error_message);
548 break;
549 case RETURNED:
550 buffer << " Result: illegal return in test statement.\n"
551 << " Error msg:\n" << FormatDeathTestOutput(error_message);
552 break;
553 case DIED:
554 if (status_ok) {
555 const bool matched = RE::PartialMatch(error_message.c_str(), *regex());
556 if (matched) {
557 success = true;
558 } else {
559 buffer << " Result: died but not with expected error.\n"
560 << " Expected: " << regex()->pattern() << "\n"
561 << "Actual msg:\n" << FormatDeathTestOutput(error_message);
562 }
563 } else {
564 buffer << " Result: died but not with expected exit code:\n"
565 << " " << ExitSummary(status()) << "\n"
566 << "Actual msg:\n" << FormatDeathTestOutput(error_message);
567 }
568 break;
569 case IN_PROGRESS:
570 default:
571 GTEST_LOG_(FATAL)
572 << "DeathTest::Passed somehow called before conclusion of test";
573 }
574
575 DeathTest::set_last_death_test_message(buffer.GetString());
576 return success;
577 }
578
579 # if GTEST_OS_WINDOWS
580 // WindowsDeathTest implements death tests on Windows. Due to the
581 // specifics of starting new processes on Windows, death tests there are
582 // always threadsafe, and Google Test considers the
583 // --gtest_death_test_style=fast setting to be equivalent to
584 // --gtest_death_test_style=threadsafe there.
585 //
586 // A few implementation notes: Like the Linux version, the Windows
587 // implementation uses pipes for child-to-parent communication. But due to
588 // the specifics of pipes on Windows, some extra steps are required:
589 //
590 // 1. The parent creates a communication pipe and stores handles to both
591 // ends of it.
592 // 2. The parent starts the child and provides it with the information
593 // necessary to acquire the handle to the write end of the pipe.
594 // 3. The child acquires the write end of the pipe and signals the parent
595 // using a Windows event.
596 // 4. Now the parent can release the write end of the pipe on its side. If
597 // this is done before step 3, the object's reference count goes down to
598 // 0 and it is destroyed, preventing the child from acquiring it. The
599 // parent now has to release it, or read operations on the read end of
600 // the pipe will not return when the child terminates.
601 // 5. The parent reads child's output through the pipe (outcome code and
602 // any possible error messages) from the pipe, and its stderr and then
603 // determines whether to fail the test.
604 //
605 // Note: to distinguish Win32 API calls from the local method and function
606 // calls, the former are explicitly resolved in the global namespace.
607 //
608 class WindowsDeathTest : public DeathTestImpl {
609 public:
610 WindowsDeathTest(const char* a_statement,
611 const RE* a_regex,
612 const char* file,
613 int line)
614 : DeathTestImpl(a_statement, a_regex), file_(file), line_(line) {}
615
616 // All of these virtual functions are inherited from DeathTest.
617 virtual int Wait();
618 virtual TestRole AssumeRole();
619
620 private:
621 // The name of the file in which the death test is located.
622 const char* const file_;
623 // The line number on which the death test is located.
624 const int line_;
625 // Handle to the write end of the pipe to the child process.
626 AutoHandle write_handle_;
627 // Child process handle.
628 AutoHandle child_handle_;
629 // Event the child process uses to signal the parent that it has
630 // acquired the handle to the write end of the pipe. After seeing this
631 // event the parent can release its own handles to make sure its
632 // ReadFile() calls return when the child terminates.
633 AutoHandle event_handle_;
634 };
635
636 // Waits for the child in a death test to exit, returning its exit
637 // status, or 0 if no child process exists. As a side effect, sets the
638 // outcome data member.
639 int WindowsDeathTest::Wait() {
640 if (!spawned())
641 return 0;
642
643 // Wait until the child either signals that it has acquired the write end
644 // of the pipe or it dies.
645 const HANDLE wait_handles[2] = { child_handle_.Get(), event_handle_.Get() };
646 switch (::WaitForMultipleObjects(2,
647 wait_handles,
648 FALSE, // Waits for any of the handles.
649 INFINITE)) {
650 case WAIT_OBJECT_0:
651 case WAIT_OBJECT_0 + 1:
652 break;
653 default:
654 GTEST_DEATH_TEST_CHECK_(false); // Should not get here.
655 }
656
657 // The child has acquired the write end of the pipe or exited.
658 // We release the handle on our side and continue.
659 write_handle_.Reset();
660 event_handle_.Reset();
661
662 ReadAndInterpretStatusByte();
663
664 // Waits for the child process to exit if it haven't already. This
665 // returns immediately if the child has already exited, regardless of
666 // whether previous calls to WaitForMultipleObjects synchronized on this
667 // handle or not.
668 GTEST_DEATH_TEST_CHECK_(
669 WAIT_OBJECT_0 == ::WaitForSingleObject(child_handle_.Get(),
670 INFINITE));
671 DWORD status_code;
672 GTEST_DEATH_TEST_CHECK_(
673 ::GetExitCodeProcess(child_handle_.Get(), &status_code) != FALSE);
674 child_handle_.Reset();
675 set_status(static_cast<int>(status_code));
676 return status();
677 }
678
679 // The AssumeRole process for a Windows death test. It creates a child
680 // process with the same executable as the current process to run the
681 // death test. The child process is given the --gtest_filter and
682 // --gtest_internal_run_death_test flags such that it knows to run the
683 // current death test only.
684 DeathTest::TestRole WindowsDeathTest::AssumeRole() {
685 const UnitTestImpl* const impl = GetUnitTestImpl();
686 const InternalRunDeathTestFlag* const flag =
687 impl->internal_run_death_test_flag();
688 const TestInfo* const info = impl->current_test_info();
689 const int death_test_index = info->result()->death_test_count();
690
691 if (flag != NULL) {
692 // ParseInternalRunDeathTestFlag() has performed all the necessary
693 // processing.
694 set_write_fd(flag->write_fd());
695 return EXECUTE_TEST;
696 }
697
698 // WindowsDeathTest uses an anonymous pipe to communicate results of
699 // a death test.
700 SECURITY_ATTRIBUTES handles_are_inheritable = {
701 sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };
702 HANDLE read_handle, write_handle;
703 GTEST_DEATH_TEST_CHECK_(
704 ::CreatePipe(&read_handle, &write_handle, &handles_are_inheritable,
705 0) // Default buffer size.
706 != FALSE);
707 set_read_fd(::_open_osfhandle(reinterpret_cast<intptr_t>(read_handle),
708 O_RDONLY));
709 write_handle_.Reset(write_handle);
710 event_handle_.Reset(::CreateEvent(
711 &handles_are_inheritable,
712 TRUE, // The event will automatically reset to non-signaled state.
713 FALSE, // The initial state is non-signalled.
714 NULL)); // The even is unnamed.
715 GTEST_DEATH_TEST_CHECK_(event_handle_.Get() != NULL);
716 const std::string filter_flag =
717 std::string("--") + GTEST_FLAG_PREFIX_ + kFilterFlag + "=" +
718 info->test_case_name() + "." + info->name();
719 const std::string internal_flag =
720 std::string("--") + GTEST_FLAG_PREFIX_ + kInternalRunDeathTestFlag +
721 "=" + file_ + "|" + StreamableToString(line_) + "|" +
722 StreamableToString(death_test_index) + "|" +
723 StreamableToString(static_cast<unsigned int>(::GetCurrentProcessId())) +
724 // size_t has the same width as pointers on both 32-bit and 64-bit
725 // Windows platforms.
726 // See http://msdn.microsoft.com/en-us/library/tcxf1dw6.aspx.
727 "|" + StreamableToString(reinterpret_cast<size_t>(write_handle)) +
728 "|" + StreamableToString(reinterpret_cast<size_t>(event_handle_.Get()));
729
730 char executable_path[_MAX_PATH + 1]; // NOLINT
731 GTEST_DEATH_TEST_CHECK_(
732 _MAX_PATH + 1 != ::GetModuleFileNameA(NULL,
733 executable_path,
734 _MAX_PATH));
735
736 std::string command_line =
737 std::string(::GetCommandLineA()) + " " + filter_flag + " \"" +
738 internal_flag + "\"";
739
740 DeathTest::set_last_death_test_message("");
741
742 CaptureStderr();
743 // Flush the log buffers since the log streams are shared with the child.
744 FlushInfoLog();
745
746 // The child process will share the standard handles with the parent.
747 STARTUPINFOA startup_info;
748 memset(&startup_info, 0, sizeof(STARTUPINFO));
749 startup_info.dwFlags = STARTF_USESTDHANDLES;
750 startup_info.hStdInput = ::GetStdHandle(STD_INPUT_HANDLE);
751 startup_info.hStdOutput = ::GetStdHandle(STD_OUTPUT_HANDLE);
752 startup_info.hStdError = ::GetStdHandle(STD_ERROR_HANDLE);
753
754 PROCESS_INFORMATION process_info;
755 GTEST_DEATH_TEST_CHECK_(::CreateProcessA(
756 executable_path,
757 const_cast<char*>(command_line.c_str()),
758 NULL, // Retuned process handle is not inheritable.
759 NULL, // Retuned thread handle is not inheritable.
760 TRUE, // Child inherits all inheritable handles (for write_handle_).
761 0x0, // Default creation flags.
762 NULL, // Inherit the parent's environment.
763 UnitTest::GetInstance()->original_working_dir(),
764 &startup_info,
765 &process_info) != FALSE);
766 child_handle_.Reset(process_info.hProcess);
767 ::CloseHandle(process_info.hThread);
768 set_spawned(true);
769 return OVERSEE_TEST;
770 }
771 # else // We are not on Windows.
772
773 // ForkingDeathTest provides implementations for most of the abstract
774 // methods of the DeathTest interface. Only the AssumeRole method is
775 // left undefined.
776 class ForkingDeathTest : public DeathTestImpl {
777 public:
778 ForkingDeathTest(const char* statement, const RE* regex);
779
780 // All of these virtual functions are inherited from DeathTest.
781 virtual int Wait();
782
783 protected:
784 void set_child_pid(pid_t child_pid) { child_pid_ = child_pid; }
785
786 private:
787 // PID of child process during death test; 0 in the child process itself.
788 pid_t child_pid_;
789 };
790
791 // Constructs a ForkingDeathTest.
792 ForkingDeathTest::ForkingDeathTest(const char* a_statement, const RE* a_regex)
793 : DeathTestImpl(a_statement, a_regex),
794 child_pid_(-1) {}
795
796 // Waits for the child in a death test to exit, returning its exit
797 // status, or 0 if no child process exists. As a side effect, sets the
798 // outcome data member.
799 int ForkingDeathTest::Wait() {
800 if (!spawned())
801 return 0;
802
803 ReadAndInterpretStatusByte();
804
805 int status_value;
806 GTEST_DEATH_TEST_CHECK_SYSCALL_(waitpid(child_pid_, &status_value, 0));
807 set_status(status_value);
808 return status_value;
809 }
810
811 // A concrete death test class that forks, then immediately runs the test
812 // in the child process.
813 class NoExecDeathTest : public ForkingDeathTest {
814 public:
815 NoExecDeathTest(const char* a_statement, const RE* a_regex) :
816 ForkingDeathTest(a_statement, a_regex) { }
817 virtual TestRole AssumeRole();
818 };
819
820 // The AssumeRole process for a fork-and-run death test. It implements a
821 // straightforward fork, with a simple pipe to transmit the status byte.
822 DeathTest::TestRole NoExecDeathTest::AssumeRole() {
823 const size_t thread_count = GetThreadCount();
824 if (thread_count != 1) {
825 GTEST_LOG_(WARNING) << DeathTestThreadWarning(thread_count);
826 }
827
828 int pipe_fd[2];
829 GTEST_DEATH_TEST_CHECK_(pipe(pipe_fd) != -1);
830
831 DeathTest::set_last_death_test_message("");
832 CaptureStderr();
833 // When we fork the process below, the log file buffers are copied, but the
834 // file descriptors are shared. We flush all log files here so that closing
835 // the file descriptors in the child process doesn't throw off the
836 // synchronization between descriptors and buffers in the parent process.
837 // This is as close to the fork as possible to avoid a race condition in case
838 // there are multiple threads running before the death test, and another
839 // thread writes to the log file.
840 FlushInfoLog();
841
842 const pid_t child_pid = fork();
843 GTEST_DEATH_TEST_CHECK_(child_pid != -1);
844 set_child_pid(child_pid);
845 if (child_pid == 0) {
846 GTEST_DEATH_TEST_CHECK_SYSCALL_(close(pipe_fd[0]));
847 set_write_fd(pipe_fd[1]);
848 // Redirects all logging to stderr in the child process to prevent
849 // concurrent writes to the log files. We capture stderr in the parent
850 // process and append the child process' output to a log.
851 LogToStderr();
852 // Event forwarding to the listeners of event listener API mush be shut
853 // down in death test subprocesses.
854 GetUnitTestImpl()->listeners()->SuppressEventForwarding();
855 g_in_fast_death_test_child = true;
856 return EXECUTE_TEST;
857 } else {
858 GTEST_DEATH_TEST_CHECK_SYSCALL_(close(pipe_fd[1]));
859 set_read_fd(pipe_fd[0]);
860 set_spawned(true);
861 return OVERSEE_TEST;
862 }
863 }
864
865 // A concrete death test class that forks and re-executes the main
866 // program from the beginning, with command-line flags set that cause
867 // only this specific death test to be run.
868 class ExecDeathTest : public ForkingDeathTest {
869 public:
870 ExecDeathTest(const char* a_statement, const RE* a_regex,
871 const char* file, int line) :
872 ForkingDeathTest(a_statement, a_regex), file_(file), line_(line) { }
873 virtual TestRole AssumeRole();
874 private:
875 static ::std::vector<testing::internal::string>
876 GetArgvsForDeathTestChildProcess() {
877 ::std::vector<testing::internal::string> args = GetInjectableArgvs();
878 return args;
879 }
880 // The name of the file in which the death test is located.
881 const char* const file_;
882 // The line number on which the death test is located.
883 const int line_;
884 };
885
886 // Utility class for accumulating command-line arguments.
887 class Arguments {
888 public:
889 Arguments() {
890 args_.push_back(NULL);
891 }
892
893 ~Arguments() {
894 for (std::vector<char*>::iterator i = args_.begin(); i != args_.end();
895 ++i) {
896 free(*i);
897 }
898 }
899 void AddArgument(const char* argument) {
900 args_.insert(args_.end() - 1, posix::StrDup(argument));
901 }
902
903 template <typename Str>
904 void AddArguments(const ::std::vector<Str>& arguments) {
905 for (typename ::std::vector<Str>::const_iterator i = arguments.begin();
906 i != arguments.end();
907 ++i) {
908 args_.insert(args_.end() - 1, posix::StrDup(i->c_str()));
909 }
910 }
911 char* const* Argv() {
912 return &args_[0];
913 }
914
915 private:
916 std::vector<char*> args_;
917 };
918
919 // A struct that encompasses the arguments to the child process of a
920 // threadsafe-style death test process.
921 struct ExecDeathTestArgs {
922 char* const* argv; // Command-line arguments for the child's call to exec
923 int close_fd; // File descriptor to close; the read end of a pipe
924 };
925
926 # if GTEST_OS_MAC
927 inline char** GetEnviron() {
928 // When Google Test is built as a framework on MacOS X, the environ variable
929 // is unavailable. Apple's documentation (man environ) recommends using
930 // _NSGetEnviron() instead.
931 return *_NSGetEnviron();
932 }
933 # else
934 // Some POSIX platforms expect you to declare environ. extern "C" makes
935 // it reside in the global namespace.
936 extern "C" char** environ;
937 inline char** GetEnviron() { return environ; }
938 # endif // GTEST_OS_MAC
939
940 # if !GTEST_OS_QNX
941 // The main function for a threadsafe-style death test child process.
942 // This function is called in a clone()-ed process and thus must avoid
943 // any potentially unsafe operations like malloc or libc functions.
944 static int ExecDeathTestChildMain(void* child_arg) {
945 ExecDeathTestArgs* const args = static_cast<ExecDeathTestArgs*>(child_arg);
946 GTEST_DEATH_TEST_CHECK_SYSCALL_(close(args->close_fd));
947
948 // We need to execute the test program in the same environment where
949 // it was originally invoked. Therefore we change to the original
950 // working directory first.
951 const char* const original_dir =
952 UnitTest::GetInstance()->original_working_dir();
953 // We can safely call chdir() as it's a direct system call.
954 if (chdir(original_dir) != 0) {
955 DeathTestAbort(std::string("chdir(\"") + original_dir + "\") failed: " +
956 GetLastErrnoDescription());
957 return EXIT_FAILURE;
958 }
959
960 // We can safely call execve() as it's a direct system call. We
961 // cannot use execvp() as it's a libc function and thus potentially
962 // unsafe. Since execve() doesn't search the PATH, the user must
963 // invoke the test program via a valid path that contains at least
964 // one path separator.
965 execve(args->argv[0], args->argv, GetEnviron());
966 DeathTestAbort(std::string("execve(") + args->argv[0] + ", ...) in " +
967 original_dir + " failed: " +
968 GetLastErrnoDescription());
969 return EXIT_FAILURE;
970 }
971 # endif // !GTEST_OS_QNX
972
973 // Two utility routines that together determine the direction the stack
974 // grows.
975 // This could be accomplished more elegantly by a single recursive
976 // function, but we want to guard against the unlikely possibility of
977 // a smart compiler optimizing the recursion away.
978 //
979 // GTEST_NO_INLINE_ is required to prevent GCC 4.6 from inlining
980 // StackLowerThanAddress into StackGrowsDown, which then doesn't give
981 // correct answer.
982 void StackLowerThanAddress(const void* ptr, bool* result) GTEST_NO_INLINE_;
983 void StackLowerThanAddress(const void* ptr, bool* result) {
984 int dummy;
985 *result = (&dummy < ptr);
986 }
987
988 bool StackGrowsDown() {
989 int dummy;
990 bool result;
991 StackLowerThanAddress(&dummy, &result);
992 return result;
993 }
994
995 // Spawns a child process with the same executable as the current process in
996 // a thread-safe manner and instructs it to run the death test. The
997 // implementation uses fork(2) + exec. On systems where clone(2) is
998 // available, it is used instead, being slightly more thread-safe. On QNX,
999 // fork supports only single-threaded environments, so this function uses
1000 // spawn(2) there instead. The function dies with an error message if
1001 // anything goes wrong.
1002 static pid_t ExecDeathTestSpawnChild(char* const* argv, int close_fd) {
1003 ExecDeathTestArgs args = { argv, close_fd };
1004 pid_t child_pid = -1;
1005
1006 # if GTEST_OS_QNX
1007 // Obtains the current directory and sets it to be closed in the child
1008 // process.
1009 const int cwd_fd = open(".", O_RDONLY);
1010 GTEST_DEATH_TEST_CHECK_(cwd_fd != -1);
1011 GTEST_DEATH_TEST_CHECK_SYSCALL_(fcntl(cwd_fd, F_SETFD, FD_CLOEXEC));
1012 // We need to execute the test program in the same environment where
1013 // it was originally invoked. Therefore we change to the original
1014 // working directory first.
1015 const char* const original_dir =
1016 UnitTest::GetInstance()->original_working_dir();
1017 // We can safely call chdir() as it's a direct system call.
1018 if (chdir(original_dir) != 0) {
1019 DeathTestAbort(std::string("chdir(\"") + original_dir + "\") failed: " +
1020 GetLastErrnoDescription());
1021 return EXIT_FAILURE;
1022 }
1023
1024 int fd_flags;
1025 // Set close_fd to be closed after spawn.
1026 GTEST_DEATH_TEST_CHECK_SYSCALL_(fd_flags = fcntl(close_fd, F_GETFD));
1027 GTEST_DEATH_TEST_CHECK_SYSCALL_(fcntl(close_fd, F_SETFD,
1028 fd_flags | FD_CLOEXEC));
1029 struct inheritance inherit = {0};
1030 // spawn is a system call.
1031 child_pid = spawn(args.argv[0], 0, NULL, &inherit, args.argv, GetEnviron());
1032 // Restores the current working directory.
1033 GTEST_DEATH_TEST_CHECK_(fchdir(cwd_fd) != -1);
1034 GTEST_DEATH_TEST_CHECK_SYSCALL_(close(cwd_fd));
1035
1036 # else // GTEST_OS_QNX
1037 # if GTEST_OS_LINUX
1038 // When a SIGPROF signal is received while fork() or clone() are executing,
1039 // the process may hang. To avoid this, we ignore SIGPROF here and re-enable
1040 // it after the call to fork()/clone() is complete.
1041 struct sigaction saved_sigprof_action;
1042 struct sigaction ignore_sigprof_action;
1043 memset(&ignore_sigprof_action, 0, sizeof(ignore_sigprof_action));
1044 sigemptyset(&ignore_sigprof_action.sa_mask);
1045 ignore_sigprof_action.sa_handler = SIG_IGN;
1046 GTEST_DEATH_TEST_CHECK_SYSCALL_(sigaction(
1047 SIGPROF, &ignore_sigprof_action, &saved_sigprof_action));
1048 # endif // GTEST_OS_LINUX
1049
1050 # if GTEST_HAS_CLONE
1051 const bool use_fork = GTEST_FLAG(death_test_use_fork);
1052
1053 if (!use_fork) {
1054 static const bool stack_grows_down = StackGrowsDown();
1055 const size_t stack_size = getpagesize();
1056 // MMAP_ANONYMOUS is not defined on Mac, so we use MAP_ANON instead.
1057 void* const stack = mmap(NULL, stack_size, PROT_READ | PROT_WRITE,
1058 MAP_ANON | MAP_PRIVATE, -1, 0);
1059 GTEST_DEATH_TEST_CHECK_(stack != MAP_FAILED);
1060
1061 // Maximum stack alignment in bytes: For a downward-growing stack, this
1062 // amount is subtracted from size of the stack space to get an address
1063 // that is within the stack space and is aligned on all systems we care
1064 // about. As far as I know there is no ABI with stack alignment greater
1065 // than 64. We assume stack and stack_size already have alignment of
1066 // kMaxStackAlignment.
1067 const size_t kMaxStackAlignment = 64;
1068 void* const stack_top =
1069 static_cast<char*>(stack) +
1070 (stack_grows_down ? stack_size - kMaxStackAlignment : 0);
1071 GTEST_DEATH_TEST_CHECK_(stack_size > kMaxStackAlignment &&
1072 reinterpret_cast<intptr_t>(stack_top) % kMaxStackAlignment == 0);
1073
1074 child_pid = clone(&ExecDeathTestChildMain, stack_top, SIGCHLD, &args);
1075
1076 GTEST_DEATH_TEST_CHECK_(munmap(stack, stack_size) != -1);
1077 }
1078 # else
1079 const bool use_fork = true;
1080 # endif // GTEST_HAS_CLONE
1081
1082 if (use_fork && (child_pid = fork()) == 0) {
1083 ExecDeathTestChildMain(&args);
1084 _exit(0);
1085 }
1086 # endif // GTEST_OS_QNX
1087 # if GTEST_OS_LINUX
1088 GTEST_DEATH_TEST_CHECK_SYSCALL_(
1089 sigaction(SIGPROF, &saved_sigprof_action, NULL));
1090 # endif // GTEST_OS_LINUX
1091
1092 GTEST_DEATH_TEST_CHECK_(child_pid != -1);
1093 return child_pid;
1094 }
1095
1096 // The AssumeRole process for a fork-and-exec death test. It re-executes the
1097 // main program from the beginning, setting the --gtest_filter
1098 // and --gtest_internal_run_death_test flags to cause only the current
1099 // death test to be re-run.
1100 DeathTest::TestRole ExecDeathTest::AssumeRole() {
1101 const UnitTestImpl* const impl = GetUnitTestImpl();
1102 const InternalRunDeathTestFlag* const flag =
1103 impl->internal_run_death_test_flag();
1104 const TestInfo* const info = impl->current_test_info();
1105 const int death_test_index = info->result()->death_test_count();
1106
1107 if (flag != NULL) {
1108 set_write_fd(flag->write_fd());
1109 return EXECUTE_TEST;
1110 }
1111
1112 int pipe_fd[2];
1113 GTEST_DEATH_TEST_CHECK_(pipe(pipe_fd) != -1);
1114 // Clear the close-on-exec flag on the write end of the pipe, lest
1115 // it be closed when the child process does an exec:
1116 GTEST_DEATH_TEST_CHECK_(fcntl(pipe_fd[1], F_SETFD, 0) != -1);
1117
1118 const std::string filter_flag =
1119 std::string("--") + GTEST_FLAG_PREFIX_ + kFilterFlag + "="
1120 + info->test_case_name() + "." + info->name();
1121 const std::string internal_flag =
1122 std::string("--") + GTEST_FLAG_PREFIX_ + kInternalRunDeathTestFlag + "="
1123 + file_ + "|" + StreamableToString(line_) + "|"
1124 + StreamableToString(death_test_index) + "|"
1125 + StreamableToString(pipe_fd[1]);
1126 Arguments args;
1127 args.AddArguments(GetArgvsForDeathTestChildProcess());
1128 args.AddArgument(filter_flag.c_str());
1129 args.AddArgument(internal_flag.c_str());
1130
1131 DeathTest::set_last_death_test_message("");
1132
1133 CaptureStderr();
1134 // See the comment in NoExecDeathTest::AssumeRole for why the next line
1135 // is necessary.
1136 FlushInfoLog();
1137
1138 const pid_t child_pid = ExecDeathTestSpawnChild(args.Argv(), pipe_fd[0]);
1139 GTEST_DEATH_TEST_CHECK_SYSCALL_(close(pipe_fd[1]));
1140 set_child_pid(child_pid);
1141 set_read_fd(pipe_fd[0]);
1142 set_spawned(true);
1143 return OVERSEE_TEST;
1144 }
1145
1146 # endif // !GTEST_OS_WINDOWS
1147
1148 // Creates a concrete DeathTest-derived class that depends on the
1149 // --gtest_death_test_style flag, and sets the pointer pointed to
1150 // by the "test" argument to its address. If the test should be
1151 // skipped, sets that pointer to NULL. Returns true, unless the
1152 // flag is set to an invalid value.
1153 bool DefaultDeathTestFactory::Create(const char* statement, const RE* regex,
1154 const char* file, int line,
1155 DeathTest** test) {
1156 UnitTestImpl* const impl = GetUnitTestImpl();
1157 const InternalRunDeathTestFlag* const flag =
1158 impl->internal_run_death_test_flag();
1159 const int death_test_index = impl->current_test_info()
1160 ->increment_death_test_count();
1161
1162 if (flag != NULL) {
1163 if (death_test_index > flag->index()) {
1164 DeathTest::set_last_death_test_message(
1165 "Death test count (" + StreamableToString(death_test_index)
1166 + ") somehow exceeded expected maximum ("
1167 + StreamableToString(flag->index()) + ")");
1168 return false;
1169 }
1170
1171 if (!(flag->file() == file && flag->line() == line &&
1172 flag->index() == death_test_index)) {
1173 *test = NULL;
1174 return true;
1175 }
1176 }
1177
1178 # if GTEST_OS_WINDOWS
1179
1180 if (GTEST_FLAG(death_test_style) == "threadsafe" ||
1181 GTEST_FLAG(death_test_style) == "fast") {
1182 *test = new WindowsDeathTest(statement, regex, file, line);
1183 }
1184
1185 # else
1186
1187 if (GTEST_FLAG(death_test_style) == "threadsafe") {
1188 *test = new ExecDeathTest(statement, regex, file, line);
1189 } else if (GTEST_FLAG(death_test_style) == "fast") {
1190 *test = new NoExecDeathTest(statement, regex);
1191 }
1192
1193 # endif // GTEST_OS_WINDOWS
1194
1195 else { // NOLINT - this is more readable than unbalanced brackets inside #if.
1196 DeathTest::set_last_death_test_message(
1197 "Unknown death test style \"" + GTEST_FLAG(death_test_style)
1198 + "\" encountered");
1199 return false;
1200 }
1201
1202 return true;
1203 }
1204
1205 // Splits a given string on a given delimiter, populating a given
1206 // vector with the fields. GTEST_HAS_DEATH_TEST implies that we have
1207 // ::std::string, so we can use it here.
1208 static void SplitString(const ::std::string& str, char delimiter,
1209 ::std::vector< ::std::string>* dest) {
1210 ::std::vector< ::std::string> parsed;
1211 ::std::string::size_type pos = 0;
1212 while (::testing::internal::AlwaysTrue()) {
1213 const ::std::string::size_type colon = str.find(delimiter, pos);
1214 if (colon == ::std::string::npos) {
1215 parsed.push_back(str.substr(pos));
1216 break;
1217 } else {
1218 parsed.push_back(str.substr(pos, colon - pos));
1219 pos = colon + 1;
1220 }
1221 }
1222 dest->swap(parsed);
1223 }
1224
1225 # if GTEST_OS_WINDOWS
1226 // Recreates the pipe and event handles from the provided parameters,
1227 // signals the event, and returns a file descriptor wrapped around the pipe
1228 // handle. This function is called in the child process only.
1229 int GetStatusFileDescriptor(unsigned int parent_process_id,
1230 size_t write_handle_as_size_t,
1231 size_t event_handle_as_size_t) {
1232 AutoHandle parent_process_handle(::OpenProcess(PROCESS_DUP_HANDLE,
1233 FALSE, // Non-inheritable.
1234 parent_process_id));
1235 if (parent_process_handle.Get() == INVALID_HANDLE_VALUE) {
1236 DeathTestAbort("Unable to open parent process " +
1237 StreamableToString(parent_process_id));
1238 }
1239
1240 // TODO(vladl@google.com): Replace the following check with a
1241 // compile-time assertion when available.
1242 GTEST_CHECK_(sizeof(HANDLE) <= sizeof(size_t));
1243
1244 const HANDLE write_handle =
1245 reinterpret_cast<HANDLE>(write_handle_as_size_t);
1246 HANDLE dup_write_handle;
1247
1248 // The newly initialized handle is accessible only in in the parent
1249 // process. To obtain one accessible within the child, we need to use
1250 // DuplicateHandle.
1251 if (!::DuplicateHandle(parent_process_handle.Get(), write_handle,
1252 ::GetCurrentProcess(), &dup_write_handle,
1253 0x0, // Requested privileges ignored since
1254 // DUPLICATE_SAME_ACCESS is used.
1255 FALSE, // Request non-inheritable handler.
1256 DUPLICATE_SAME_ACCESS)) {
1257 DeathTestAbort("Unable to duplicate the pipe handle " +
1258 StreamableToString(write_handle_as_size_t) +
1259 " from the parent process " +
1260 StreamableToString(parent_process_id));
1261 }
1262
1263 const HANDLE event_handle = reinterpret_cast<HANDLE>(event_handle_as_size_t);
1264 HANDLE dup_event_handle;
1265
1266 if (!::DuplicateHandle(parent_process_handle.Get(), event_handle,
1267 ::GetCurrentProcess(), &dup_event_handle,
1268 0x0,
1269 FALSE,
1270 DUPLICATE_SAME_ACCESS)) {
1271 DeathTestAbort("Unable to duplicate the event handle " +
1272 StreamableToString(event_handle_as_size_t) +
1273 " from the parent process " +
1274 StreamableToString(parent_process_id));
1275 }
1276
1277 const int write_fd =
1278 ::_open_osfhandle(reinterpret_cast<intptr_t>(dup_write_handle), O_APPEND);
1279 if (write_fd == -1) {
1280 DeathTestAbort("Unable to convert pipe handle " +
1281 StreamableToString(write_handle_as_size_t) +
1282 " to a file descriptor");
1283 }
1284
1285 // Signals the parent that the write end of the pipe has been acquired
1286 // so the parent can release its own write end.
1287 ::SetEvent(dup_event_handle);
1288
1289 return write_fd;
1290 }
1291 # endif // GTEST_OS_WINDOWS
1292
1293 // Returns a newly created InternalRunDeathTestFlag object with fields
1294 // initialized from the GTEST_FLAG(internal_run_death_test) flag if
1295 // the flag is specified; otherwise returns NULL.
1296 InternalRunDeathTestFlag* ParseInternalRunDeathTestFlag() {
1297 if (GTEST_FLAG(internal_run_death_test) == "") return NULL;
1298
1299 // GTEST_HAS_DEATH_TEST implies that we have ::std::string, so we
1300 // can use it here.
1301 int line = -1;
1302 int index = -1;
1303 ::std::vector< ::std::string> fields;
1304 SplitString(GTEST_FLAG(internal_run_death_test).c_str(), '|', &fields);
1305 int write_fd = -1;
1306
1307 # if GTEST_OS_WINDOWS
1308
1309 unsigned int parent_process_id = 0;
1310 size_t write_handle_as_size_t = 0;
1311 size_t event_handle_as_size_t = 0;
1312
1313 if (fields.size() != 6
1314 || !ParseNaturalNumber(fields[1], &line)
1315 || !ParseNaturalNumber(fields[2], &index)
1316 || !ParseNaturalNumber(fields[3], &parent_process_id)
1317 || !ParseNaturalNumber(fields[4], &write_handle_as_size_t)
1318 || !ParseNaturalNumber(fields[5], &event_handle_as_size_t)) {
1319 DeathTestAbort("Bad --gtest_internal_run_death_test flag: " +
1320 GTEST_FLAG(internal_run_death_test));
1321 }
1322 write_fd = GetStatusFileDescriptor(parent_process_id,
1323 write_handle_as_size_t,
1324 event_handle_as_size_t);
1325 # else
1326
1327 if (fields.size() != 4
1328 || !ParseNaturalNumber(fields[1], &line)
1329 || !ParseNaturalNumber(fields[2], &index)
1330 || !ParseNaturalNumber(fields[3], &write_fd)) {
1331 DeathTestAbort("Bad --gtest_internal_run_death_test flag: "
1332 + GTEST_FLAG(internal_run_death_test));
1333 }
1334
1335 # endif // GTEST_OS_WINDOWS
1336
1337 return new InternalRunDeathTestFlag(fields[0], line, index, write_fd);
1338 }
1339
1340 } // namespace internal
1341
1342 #endif // GTEST_HAS_DEATH_TEST
1343
1344 } // namespace testing