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The procFinished event handler is registered after the process is started. This doesn't actually create any race, as the finished signal is emitted after a SIGCHLD is caught and handled through the ProcessManager and processed by the event loop. However, to follow the best practice that resources should be acquired before performing an action, connect the finished signal before starting the process. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
101 lines
1.8 KiB
C++
101 lines
1.8 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* process_test.cpp - Process test
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*/
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#include <iostream>
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#include <unistd.h>
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#include <vector>
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#include <libcamera/event_dispatcher.h>
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#include <libcamera/timer.h>
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#include "process.h"
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#include "test.h"
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#include "thread.h"
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#include "utils.h"
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using namespace std;
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using namespace libcamera;
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class ProcessTestChild
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{
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public:
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int run(int status)
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{
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usleep(50000);
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return status;
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}
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};
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class ProcessTest : public Test
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{
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public:
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ProcessTest()
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{
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}
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protected:
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int run()
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{
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EventDispatcher *dispatcher = Thread::current()->eventDispatcher();
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Timer timeout;
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int exitCode = 42;
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vector<std::string> args;
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args.push_back(to_string(exitCode));
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proc_.finished.connect(this, &ProcessTest::procFinished);
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int ret = proc_.start("/proc/self/exe", args);
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if (ret) {
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cerr << "failed to start process" << endl;
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return TestFail;
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}
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timeout.start(100);
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while (timeout.isRunning())
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dispatcher->processEvents();
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if (exitStatus_ != Process::NormalExit) {
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cerr << "process did not exit normally" << endl;
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return TestFail;
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}
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if (exitCode != exitCode_) {
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cerr << "exit code should be " << exitCode
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<< ", actual is " << exitCode_ << endl;
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return TestFail;
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}
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return TestPass;
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}
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private:
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void procFinished(Process *proc, enum Process::ExitStatus exitStatus, int exitCode)
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{
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exitStatus_ = exitStatus;
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exitCode_ = exitCode;
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}
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Process proc_;
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enum Process::ExitStatus exitStatus_;
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int exitCode_;
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};
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/*
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* Can't use TEST_REGISTER() as single binary needs to act as both
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* parent and child processes.
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*/
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int main(int argc, char **argv)
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{
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if (argc == 2) {
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int status = std::stoi(argv[1]);
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ProcessTestChild child;
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return child.run(status);
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}
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return ProcessTest().execute();
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}
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