AuroraRuntime/Source/Processes/AuProcess.Unix.cpp

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/***
Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
File: AuProcess.Unix.cpp
File: Process.Linux.cpp
Date: 2021-6-12
Author: Reece
***/
#include <RuntimeInternal.hpp>
#include "AuProcesses.hpp"
#include "AuProcess.Unix.hpp"
#include <unistd.h>
#include <fcntl.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
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#include <Source/Threading/Primitives/AuSemaphore.Unix.hpp>
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#if defined(AURORA_COMPILER_CLANG)
// warning: enumeration values 'kEnumCount' and 'kEnumInvalid' not handled in switch [-Wswitch
#pragma clang diagnostic ignored "-Wswitch"
// Yea, I don't give a shit.
#endif
#if defined(AURORA_IS_LINUX_DERIVED)
#include <sys/prctl.h>
#include <setjmp.h>
#if !defined(CLONE_CLEAR_SIGHAND)
#define CLONE_CLEAR_SIGHAND 0x100000000ULL
#endif
#endif
namespace Aurora::Processes
{
static AuThreadPrimitives::RWLockUnique_t gRWLock;
static AuHashMap<pid_t, ProcessImpl *> gPidLookupMap;
struct ProcessAliveLoopSource : AuLoop::LSEvent
{
ProcessAliveLoopSource();
virtual AuLoop::ELoopSource GetType() override;
};
ProcessAliveLoopSource::ProcessAliveLoopSource() : LSEvent(false, false, true)
{}
AuLoop::ELoopSource ProcessAliveLoopSource::GetType()
{
return AuLoop::ELoopSource::eProcessDead;
}
ProcessImpl::ProcessImpl(StartupParameters &&params) : startup_(AuMove(params))
{
AuIOFS::NormalizePath(this->startup_.process, this->startup_.process);
if (this->startup_.workingDirectory)
{
AuString a;
AuIOFS::NormalizePath(a, this->startup_.workingDirectory.value());
this->startup_.workingDirectory = a;
}
this->startup_.args.insert(startup_.args.begin(), startup_.process);
for (const auto &arg : this->startup_.args)
{
this->cargs_.push_back(arg.c_str());
this->debug_ += arg + " ";
}
this->cargs_.push_back(nullptr);
if (this->debug_.size())
{
this->debug_.resize(this->debug_.size() - 1);
}
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this->type_ = this->startup_.type;
}
ProcessImpl::~ProcessImpl()
{
if (this->type_ == ESpawnType::eSpawnChildProcessWorker)
{
TryKill();
Terminate();
}
{
AU_LOCK_GUARD(gRWLock->AsWritable());
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if (this->alive_)
{
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if (this->type_ == ESpawnType::eSpawnThreadLeader)
{
::kill(this->pidt_, SIGCONT);
}
}
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AuTryRemove(gPidLookupMap, this->pidt_);
}
ShutdownPipes();
}
AuUInt ProcessImpl::GetProcessId()
{
return this->pidt_;
}
void ProcessImpl::ByeLol(AuSInt code)
{
this->exitCode_ = code;
if (this->finished_)
{
this->finished_->Set();
}
if (this->loopSource_)
{
this->loopSource_->Set();
}
}
void ProcessImpl::ShutdownPipes()
{
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if (!this->bDontRelOut_)
{
if (auto fd = AuExchange(pipeStdOut_[1], {}))
{
::close(fd);
}
}
if (!this->bDontRelErr_)
{
if (auto fd = AuExchange(pipeStdErr_[1], {}))
{
::close(fd);
}
}
if (!this->bDontRelIn_)
{
if (auto fd = AuExchange(pipeStdIn_[0], {}))
{
::close(fd);
}
}
}
bool ProcessImpl::TryKill()
{
AU_LOCK_GUARD(gRWLock->AsReadable());
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if (this->alive_)
{
if (::kill(this->pidt_, SIGTERM) == 0)
{
return this->finished_->LockMS(500);
}
}
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return true;
}
bool ProcessImpl::Terminate()
{
AU_LOCK_GUARD(gRWLock->AsReadable());
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if (this->alive_)
{
return ::kill(this->pidt_, SIGKILL) == 0;
}
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return true;
}
AuSPtr<Aurora::Threading::IWaitable> ProcessImpl::AsWaitable()
{
return this->finished_;
}
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AuSPtr<AuLoop::ILoopSource> ProcessImpl::AsLoopSource()
{
return this->loopSource_;
}
AuSInt ProcessImpl::GetExitCode()
{
return this->exitCode_;
}
bool ProcessImpl::Read(EStandardHandle stream, const AuMemoryViewStreamWrite &destination, bool nonblock)
{
auto handle = stream == EStandardHandle::eStdError ? this->pipeStdErr_[0] : this->pipeStdOut_[0];
if (handle < 0)
{
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SysPushErrorUninitialized();
return false;
}
auto control = ::fcntl(handle, F_GETFL);
auto ref = control;
if (nonblock)
{
control |= O_NONBLOCK;
}
else
{
control &= ~O_NONBLOCK;
}
if (ref != control)
{
::fcntl(handle, F_SETFL, control);
}
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int tmp;
do
{
tmp = ::read(handle, destination.ptr, destination.length);
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} while ((tmp == -1 && errno == EINTR));
if (tmp <= 0)
{
if (tmp == 0)
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{
return nonblock;
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}
SysPushErrorMem();
return false;
}
destination.outVariable = tmp;
return true;
}
bool ProcessImpl::Write(const AuMemoryViewStreamRead &source)
{
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auto handle = this->pipeStdIn_[1];
if (!handle)
{
return false;
}
auto control = ::fcntl(handle, F_GETFL);
auto ref = control;
if (/*nonblock*/ true)
{
control |= O_NONBLOCK;
}
else
{
control &= ~O_NONBLOCK;
}
if (ref != control)
{
::fcntl(handle, F_SETFL, control);
}
return ::write(handle, source.ptr, source.length) == source.length;
}
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static bool InitProcessStdHandles(EStreamForward fwd, int *fds)
{
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switch (fwd)
{
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case EStreamForward::eCurrentProcess:
// Intentionally NO-OP
break;
case EStreamForward::eAsyncPipe:
if (::pipe(fds))
{
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SysPushErrorMem();
return false;
}
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break;
case EStreamForward::eNull:
fds[0] = ::open("/dev/null", O_RDWR);
fds[1] = ::open("/dev/null", O_RDWR);
break;
case EStreamForward::eNewConsoleWindow:
SysPushErrorGeneric("AuProcesses is not the right place for PTY support. At least not in this form (this level of abstraction only cares for pipes).");
break;
}
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return true;
}
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bool ProcessImpl::Init()
{
InitProcessStdHandles(this->startup_.fwdOut, this->pipeStdOut_);
InitProcessStdHandles(this->startup_.fwdErr, this->pipeStdErr_);
InitProcessStdHandles(this->startup_.fwdIn, this->pipeStdIn_);
this->loopSource_ = AuMakeShared<ProcessAliveLoopSource>();
if (!this->loopSource_)
{
return false;
}
this->finished_ = AuThreadPrimitives::EventShared(false, false, true);
if (!this->finished_)
{
return false;
}
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if ((this->startup_.fwdIn == EStreamForward::eAsyncPipe) ||
(this->startup_.fwdOut == EStreamForward::eAsyncPipe))
{
this->fsHandle_ = AuIO::IOHandleShared();
if (!this->fsHandle_)
{
return false;
}
this->fsStream_ = AuMakeShared<ProcessPipeFileStream>();
if (!this->fsStream_)
{
return false;
}
this->fsHandle_->InitFromPairMove(this->pipeStdOut_[0], this->pipeStdIn_[1]);
this->fsStream_->Init(this->fsHandle_);
}
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if (this->startup_.fwdErr == EStreamForward::eAsyncPipe)
{
this->fsErrorHandle_ = AuIO::IOHandleShared();
if (!this->fsErrorHandle_)
{
return false;
}
this->fsErrorStream_ = AuMakeShared<ProcessPipeFileStream>();
if (!this->fsErrorStream_)
{
return false;
}
this->fsErrorHandle_->InitFromPairMove(this->pipeStdErr_[0], -1);
this->fsErrorStream_->Init(this->fsErrorHandle_);
}
return true;
}
AuSPtr<AuIO::IAsyncTransaction> ProcessImpl::NewAsyncTransaction()
{
return this->fsStream_ ? this->fsStream_->NewTransaction() : AuSPtr<AuIO::IAsyncTransaction> {};
}
AuSPtr<AuIO::IAsyncTransaction> ProcessImpl::NewErrorStreamAsyncTransaction()
{
return this->fsErrorStream_ ? this->fsErrorStream_->NewTransaction() : AuSPtr<AuIO::IAsyncTransaction> {};
}
void ProcessImpl::ForkMain()
{
if (this->startup_.fwdIn != EStreamForward::eCurrentProcess)
{
::dup2(pipeStdIn_[0], STDIN_FILENO);
::close(pipeStdIn_[0]);
::close(pipeStdIn_[1]);
}
if (this->startup_.fwdErr != EStreamForward::eCurrentProcess)
{
::dup2(pipeStdErr_[1], STDERR_FILENO);
::close(pipeStdIn_[0]);
::close(pipeStdIn_[1]);
}
if (this->startup_.fwdOut != EStreamForward::eCurrentProcess)
{
::dup2(pipeStdOut_[1], STDOUT_FILENO);
::close(pipeStdIn_[0]);
::close(pipeStdIn_[1]);
}
#if defined(AURORA_IS_LINUX_DERIVED)
if (this->type_ == ESpawnType::eSpawnChildProcessWorker)
{
::prctl(PR_SET_PDEATHSIG, SIGTERM);
}
#endif
::setsid();
#if defined(AURORA_IS_XNU_DERIVED)
if (this->startup_.workingDirectory)
{
::pthread_chdir_np(this->startup_.workingDirectory.value().c_str());
}
#else
if (this->startup_.workingDirectory)
{
::chroot(this->startup_.workingDirectory.value().c_str());
}
#endif
::execv(this->startup_.process.c_str(), (char * const *)this->cargs_.data()); // https://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
SysPushErrorGen("execv didn't overwrite the process map. Launch: {} ({})", this->startup_.process, this->debug_);
}
bool ProcessImpl::Start()
{
this->exitCode_ = 0x10110100;
if (this->type_ == ESpawnType::eSpawnOvermap)
{
::execv(this->startup_.process.c_str(), (char *const *)this->cargs_.data()); // https://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
SysPushErrorGen("execv didn't overwrite the process map, given {} ({})", this->startup_.process, this->debug_);
return false;
}
pid_t pid;
{
pid = ::fork();
if (pid == 0)
{
this->ForkMain();
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return false;
}
else if (pid > 0)
{
if (pipeStdOut_[1])
{
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::close(AuExchange(pipeStdOut_[1], 0));
}
if (pipeStdErr_[1])
{
::close(AuExchange(pipeStdErr_[1], 0));
}
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if (pipeStdIn_[0])
{
::close(AuExchange(pipeStdIn_[0], 0));
}
this->pidt_ = pid;
this->alive_ = true;
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{
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AU_LOCK_GUARD(gRWLock->AsWritable());
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SysAssert(AuTryInsert(gPidLookupMap, pid, this));
}
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return true;
}
else
{
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return false;
}
}
return true;
}
AUKN_SYM IProcess *SpawnNew(StartupParameters &&params)
{
auto ret = _new ProcessImpl(AuMove(params));
if (!ret)
{
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SysPushErrorMem();
return {};
}
if (!ret->Init())
{
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SysPushErrorNested();
delete ret;
return {};
}
return ret;
}
AUKN_SYM void SpawnRelease(IProcess *process)
{
AuSafeDelete<ProcessImpl *>(process);
}
static void HandleChildTermiantion(pid_t pid, int code)
{
AU_LOCK_GUARD(gRWLock->AsReadable());
auto handler = gPidLookupMap.find(pid);
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if (handler == gPidLookupMap.end())
{
return;
}
{
auto process = *handler;
process.second->ByeLol(code);
}
}
static void SigChldHandler(int)
{
int code;
pid_t pid;
while (true)
{
pid = wait3(&code, WNOHANG, nullptr);
if ((pid == 0) ||
(pid == -1))
{
break;
}
HandleChildTermiantion(pid, code);
}
}
void InitUnix()
{
gRWLock = AuThreadPrimitives::RWLockUnique();
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struct sigaction action =
{
.sa_handler = SigChldHandler,
.sa_flags = SA_ONSTACK
};
::sigemptyset(&action.sa_mask);
::sigaction(SIGCHLD, &action, nullptr);
}
void DeinitUnix()
{
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struct sigaction action =
{
.sa_handler = SIG_DFL,
.sa_flags = SA_ONSTACK | SA_NOCLDWAIT
};
::sigemptyset(&action.sa_mask);
::sigaction(SIGCHLD, &action, nullptr);
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gRWLock.reset();
}
}