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//===-- PipePosix.cpp -------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/posix/PipePosix.h"
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
using namespace lldb;
using namespace lldb_private;
int PipePosix::kInvalidDescriptor = -1;
enum PIPES { READ, WRITE }; // Constants 0 and 1 for READ and WRITE
// pipe2 is supported by Linux, FreeBSD v10 and higher.
// TODO: Add more platforms that support pipe2.
#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD__ >= 10)
#define PIPE2_SUPPORTED 1
#else
#define PIPE2_SUPPORTED 0
#endif
namespace
{
#if defined(FD_CLOEXEC) && !PIPE2_SUPPORTED
bool SetCloexecFlag(int fd)
{
int flags = ::fcntl(fd, F_GETFD);
if (flags == -1)
return false;
return (::fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == 0);
}
#endif
}
PipePosix::PipePosix()
{
m_fds[READ] = PipePosix::kInvalidDescriptor;
m_fds[WRITE] = PipePosix::kInvalidDescriptor;
}
PipePosix::~PipePosix()
{
Close();
}
Error
PipePosix::CreateNew(bool child_processes_inherit)
{
Error error;
if (CanRead() || CanWrite())
{
error.SetError(EINVAL, eErrorTypePOSIX);
return error;
}
#if PIPE2_SUPPORTED
if (::pipe2(m_fds, (child_processes_inherit) ? 0 : O_CLOEXEC) == 0)
return error;
#else
if (::pipe(m_fds) == 0)
{
#ifdef FD_CLOEXEC
if (!child_processes_inherit)
{
if (!SetCloexecFlag(m_fds[0]) || !SetCloexecFlag(m_fds[1]))
{
error.SetErrorToErrno();
Close();
return error;
}
}
#endif
return error;
}
#endif
m_fds[READ] = PipePosix::kInvalidDescriptor;
m_fds[WRITE] = PipePosix::kInvalidDescriptor;
error.SetErrorToErrno();
return error;
}
Error
PipePosix::CreateNew(llvm::StringRef name, bool child_process_inherit)
{
Error error;
if (CanRead() || CanWrite())
error.SetErrorString("Pipe is already opened");
else if (name.empty())
error.SetErrorString("Cannot create named pipe with empty name.");
else
error.SetErrorString("Not implemented");
return error;
}
Error
PipePosix::OpenAsReader(llvm::StringRef name, bool child_process_inherit)
{
Error error;
if (CanRead() || CanWrite())
error.SetErrorString("Pipe is already opened");
else if (name.empty())
error.SetErrorString("Cannot open named pipe with empty name.");
else
error.SetErrorString("Not implemented");
return error;
}
Error
PipePosix::OpenAsWriter(llvm::StringRef name, bool child_process_inherit)
{
Error error;
if (CanRead() || CanWrite())
error.SetErrorString("Pipe is already opened");
else if (name.empty())
error.SetErrorString("Cannot create named pipe with empty name.");
else
error.SetErrorString("Not implemented");
return error;
}
int
PipePosix::GetReadFileDescriptor() const
{
return m_fds[READ];
}
int
PipePosix::GetWriteFileDescriptor() const
{
return m_fds[WRITE];
}
int
PipePosix::ReleaseReadFileDescriptor()
{
const int fd = m_fds[READ];
m_fds[READ] = PipePosix::kInvalidDescriptor;
return fd;
}
int
PipePosix::ReleaseWriteFileDescriptor()
{
const int fd = m_fds[WRITE];
m_fds[WRITE] = PipePosix::kInvalidDescriptor;
return fd;
}
void
PipePosix::Close()
{
CloseReadFileDescriptor();
CloseWriteFileDescriptor();
}
bool
PipePosix::CanRead() const
{
return m_fds[READ] != PipePosix::kInvalidDescriptor;
}
bool
PipePosix::CanWrite() const
{
return m_fds[WRITE] != PipePosix::kInvalidDescriptor;
}
void
PipePosix::CloseReadFileDescriptor()
{
if (CanRead())
{
int err;
err = close(m_fds[READ]);
m_fds[READ] = PipePosix::kInvalidDescriptor;
}
}
void
PipePosix::CloseWriteFileDescriptor()
{
if (CanWrite())
{
int err;
err = close(m_fds[WRITE]);
m_fds[WRITE] = PipePosix::kInvalidDescriptor;
}
}
Error
PipePosix::Read(void *buf, size_t num_bytes, size_t &bytes_read)
{
bytes_read = 0;
Error error;
if (CanRead())
{
const int fd = GetReadFileDescriptor();
int result = read(fd, buf, num_bytes);
if (result >= 0)
bytes_read = result;
else
error.SetErrorToErrno();
}
else
error.SetError(EINVAL, eErrorTypePOSIX);
return error;
}
Error
PipePosix::ReadWithTimeout(void *buf, size_t num_bytes, const std::chrono::milliseconds &duration, size_t &bytes_read)
{
bytes_read = 0;
Error error;
error.SetErrorString("Not implemented");
return error;
}
Error
PipePosix::Write(const void *buf, size_t num_bytes, size_t &bytes_written)
{
bytes_written = 0;
Error error;
if (CanWrite())
{
const int fd = GetWriteFileDescriptor();
int result = write(fd, buf, num_bytes);
if (result >= 0)
bytes_written = result;
else
error.SetErrorToErrno();
}
else
error.SetError(EINVAL, eErrorTypePOSIX);
return error;
}
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