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#include "pipe.h"
#include <util/generic/yexception.h>
ssize_t TPipeHandle::Read(void* buffer, size_t byteCount) const noexcept {
#ifdef _win_
return recv(Fd_, (char*)buffer, byteCount, 0);
#else
return read(Fd_, buffer, byteCount);
#endif
}
ssize_t TPipeHandle::Write(const void* buffer, size_t byteCount) const noexcept {
#ifdef _win_
return send(Fd_, (const char*)buffer, byteCount, 0);
#else
return write(Fd_, buffer, byteCount);
#endif
}
bool TPipeHandle::Close() noexcept {
bool ok = true;
if (Fd_ != INVALID_PIPEHANDLE) {
#ifdef _win_
ok = closesocket(Fd_) == 0;
#else
ok = close(Fd_) == 0;
#endif
}
Fd_ = INVALID_PIPEHANDLE;
return ok;
}
void TPipeHandle::Pipe(TPipeHandle& reader, TPipeHandle& writer, EOpenMode mode) {
PIPEHANDLE fds[2];
#ifdef _win_
int r = SocketPair(fds, false /* non-overlapped */, mode & CloseOnExec /* cloexec */);
#elif defined(_linux_)
int r = pipe2(fds, mode & CloseOnExec ? O_CLOEXEC : 0);
#else
int r = pipe(fds);
#endif
if (r < 0) {
ythrow TFileError() << "failed to create a pipe";
}
#if !defined(_win_) && !defined(_linux_)
// Non-atomic wrt exec
if (mode & CloseOnExec) {
for (int i = 0; i < 2; ++i) {
int flags = fcntl(fds[i], F_GETFD, 0);
if (flags < 0) {
ythrow TFileError() << "failed to get flags";
}
int r = fcntl(fds[i], F_SETFD, flags | FD_CLOEXEC);
if (r < 0) {
ythrow TFileError() << "failed to set flags";
}
}
}
#endif
TPipeHandle(fds[0]).Swap(reader);
TPipeHandle(fds[1]).Swap(writer);
}
class TPipe::TImpl: public TAtomicRefCount<TImpl> {
public:
TImpl()
: Handle_(INVALID_PIPEHANDLE)
{
}
TImpl(PIPEHANDLE fd)
: Handle_(fd)
{
}
inline ~TImpl() {
Close();
}
bool IsOpen() {
return Handle_.IsOpen();
}
inline void Close() {
if (!Handle_.IsOpen()) {
return;
}
if (!Handle_.Close()) {
ythrow TFileError() << "failed to close pipe";
}
}
TPipeHandle& GetHandle() noexcept {
return Handle_;
}
size_t Read(void* buffer, size_t count) const {
ssize_t r = Handle_.Read(buffer, count);
if (r < 0) {
ythrow TFileError() << "failed to read from pipe";
}
return r;
}
size_t Write(const void* buffer, size_t count) const {
ssize_t r = Handle_.Write(buffer, count);
if (r < 0) {
ythrow TFileError() << "failed to write to pipe";
}
return r;
}
private:
TPipeHandle Handle_;
};
TPipe::TPipe()
: Impl_(new TImpl)
{
}
TPipe::TPipe(PIPEHANDLE fd)
: Impl_(new TImpl(fd))
{
}
TPipe::~TPipe() = default;
void TPipe::Close() {
Impl_->Close();
}
PIPEHANDLE TPipe::GetHandle() const noexcept {
return Impl_->GetHandle();
}
bool TPipe::IsOpen() const noexcept {
return Impl_->IsOpen();
}
size_t TPipe::Read(void* buf, size_t len) const {
return Impl_->Read(buf, len);
}
size_t TPipe::Write(const void* buf, size_t len) const {
return Impl_->Write(buf, len);
}
void TPipe::Pipe(TPipe& reader, TPipe& writer, EOpenMode mode) {
TImplRef r(new TImpl());
TImplRef w(new TImpl());
TPipeHandle::Pipe(r->GetHandle(), w->GetHandle(), mode);
r.Swap(reader.Impl_);
w.Swap(writer.Impl_);
}
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