libcruft-util/posix/fd.cpp
Danny Robson 34788756d2 build: don't use './' as an include prefix
GCC produces ODR error when including paths of the form './foo' and
'foo' in the same binary. Rather than managing duplication we just
universally pick the absolute form over the relative form.
2017-11-22 16:49:37 +11:00

136 lines
3.0 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2016 Danny Robson <danny@nerdcruft.net>
*/
#include "fd.hpp"
#include "../except.hpp"
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
using util::posix::fd;
///////////////////////////////////////////////////////////////////////////////
fd::fd (const std::experimental::filesystem::path &path, int flags):
fd (path, flags, 0666)
{ ; }
//-----------------------------------------------------------------------------
fd::fd (const std::experimental::filesystem::path &path, int flags, mode_t mode):
m_fd (::open (path.c_str (), flags, mode))
{
if (m_fd < 0)
errno_error::throw_code ();
}
///////////////////////////////////////////////////////////////////////////////
fd::fd (fd &&rhs):
m_fd (-1)
{
std::swap (m_fd, rhs.m_fd);
}
///////////////////////////////////////////////////////////////////////////////
fd::fd (int _fd):
m_fd (_fd)
{ ; }
///////////////////////////////////////////////////////////////////////////////
fd
fd::dup (void) const
{
return dup (m_fd);
}
//-----------------------------------------------------------------------------
fd
fd::dup (int _fd)
{
auto res = ::dup (_fd);
if (res < 0)
errno_error::throw_code ();
return fd (res);
}
///////////////////////////////////////////////////////////////////////////////
fd::~fd ()
{
if (m_fd < 0)
return;
if (close (m_fd))
errno_error::throw_code ();
}
///////////////////////////////////////////////////////////////////////////////
struct ::stat
fd::stat (void) const
{
struct stat buf;
if (fstat (m_fd, &buf))
errno_error::throw_code ();
return buf;
}
///////////////////////////////////////////////////////////////////////////////
ssize_t
fd::read (void *buffer, size_t count)
{
auto res = ::read (m_fd, buffer, count);
if (res == -1)
errno_error::throw_code ();
return res;
}
//-----------------------------------------------------------------------------
ssize_t
fd::write (const void *buffer, size_t count)
{
auto res = ::write (m_fd, buffer, count);
if (res == -1)
errno_error::throw_code ();
return res;
}
///////////////////////////////////////////////////////////////////////////////
off_t
fd::lseek (off_t offset, int whence)
{
auto res = ::lseek (m_fd, offset, whence);
if (res == -1)
errno_error::throw_code ();
return res;
}
///////////////////////////////////////////////////////////////////////////////
fd::operator int (void) const
{
return m_fd;
}