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//
// Copyright (c) 2015-2016 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
#ifndef BOOST_BEAST_CORE_IMPL_FILE_POSIX_IPP
#define BOOST_BEAST_CORE_IMPL_FILE_POSIX_IPP
#if ! defined(BOOST_BEAST_NO_POSIX_FADVISE)
# if defined(__APPLE__) || (defined(ANDROID) && (__ANDROID_API__ < 21))
# define BOOST_BEAST_NO_POSIX_FADVISE
# endif
#endif
#if ! defined(BOOST_BEAST_USE_POSIX_FADVISE)
# if ! defined(BOOST_BEAST_NO_POSIX_FADVISE)
# define BOOST_BEAST_USE_POSIX_FADVISE 1
# else
# define BOOST_BEAST_USE_POSIX_FADVISE 0
# endif
#endif
#include <boost/core/exchange.hpp>
#include <limits>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <limits.h>
namespace boost {
namespace beast {
namespace detail {
inline
int
file_posix_close(int fd)
{
for(;;)
{
if(! ::close(fd))
break;
int const ev = errno;
if(errno != EINTR)
return ev;
}
return 0;
}
} // detail
inline
file_posix::
~file_posix()
{
if(fd_ != -1)
detail::file_posix_close(fd_);
}
inline
file_posix::
file_posix(file_posix&& other)
: fd_(boost::exchange(other.fd_, -1))
{
}
inline
file_posix&
file_posix::
operator=(file_posix&& other)
{
if(&other == this)
return *this;
if(fd_ != -1)
detail::file_posix_close(fd_);
fd_ = other.fd_;
other.fd_ = -1;
return *this;
}
inline
void
file_posix::
native_handle(native_handle_type fd)
{
if(fd_ != -1)
detail::file_posix_close(fd_);
fd_ = fd;
}
inline
void
file_posix::
close(error_code& ec)
{
if(fd_ != -1)
{
auto const ev =
detail::file_posix_close(fd_);
if(ev)
ec.assign(ev, generic_category());
else
ec.assign(0, ec.category());
fd_ = -1;
}
else
{
ec.assign(0, ec.category());
}
}
inline
void
file_posix::
open(char const* path, file_mode mode, error_code& ec)
{
if(fd_ != -1)
{
auto const ev =
detail::file_posix_close(fd_);
if(ev)
ec.assign(ev, generic_category());
else
ec.assign(0, ec.category());
fd_ = -1;
}
int f = 0;
#if BOOST_BEAST_USE_POSIX_FADVISE
int advise = 0;
#endif
switch(mode)
{
default:
case file_mode::read:
f = O_RDONLY;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_RANDOM;
#endif
break;
case file_mode::scan:
f = O_RDONLY;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_SEQUENTIAL;
#endif
break;
case file_mode::write:
f = O_RDWR | O_CREAT | O_TRUNC;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_RANDOM;
#endif
break;
case file_mode::write_new:
f = O_RDWR | O_CREAT | O_EXCL;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_RANDOM;
#endif
break;
case file_mode::write_existing:
f = O_RDWR | O_EXCL;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_RANDOM;
#endif
break;
case file_mode::append:
f = O_RDWR | O_CREAT | O_TRUNC;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_SEQUENTIAL;
#endif
break;
case file_mode::append_new:
f = O_RDWR | O_CREAT | O_EXCL;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_SEQUENTIAL;
#endif
break;
case file_mode::append_existing:
f = O_RDWR | O_EXCL;
#if BOOST_BEAST_USE_POSIX_FADVISE
advise = POSIX_FADV_SEQUENTIAL;
#endif
break;
}
for(;;)
{
fd_ = ::open(path, f, 0644);
if(fd_ != -1)
break;
auto const ev = errno;
if(ev != EINTR)
{
ec.assign(ev, generic_category());
return;
}
}
#if BOOST_BEAST_USE_POSIX_FADVISE
if(::posix_fadvise(fd_, 0, 0, advise))
{
auto const ev = errno;
detail::file_posix_close(fd_);
fd_ = -1;
ec.assign(ev, generic_category());
return;
}
#endif
ec.assign(0, ec.category());
}
inline
std::uint64_t
file_posix::
size(error_code& ec) const
{
if(fd_ == -1)
{
ec = make_error_code(errc::invalid_argument);
return 0;
}
struct stat st;
if(::fstat(fd_, &st) != 0)
{
ec.assign(errno, generic_category());
return 0;
}
ec.assign(0, ec.category());
return st.st_size;
}
inline
std::uint64_t
file_posix::
pos(error_code& ec) const
{
if(fd_ == -1)
{
ec = make_error_code(errc::invalid_argument);
return 0;
}
auto const result = ::lseek(fd_, 0, SEEK_CUR);
if(result == (off_t)-1)
{
ec.assign(errno, generic_category());
return 0;
}
ec.assign(0, ec.category());
return result;
}
inline
void
file_posix::
seek(std::uint64_t offset, error_code& ec)
{
if(fd_ == -1)
{
ec = make_error_code(errc::invalid_argument);
return;
}
auto const result = ::lseek(fd_, offset, SEEK_SET);
if(result == static_cast<off_t>(-1))
{
ec.assign(errno, generic_category());
return;
}
ec.assign(0, ec.category());
}
inline
std::size_t
file_posix::
read(void* buffer, std::size_t n, error_code& ec) const
{
if(fd_ == -1)
{
ec = make_error_code(errc::invalid_argument);
return 0;
}
std::size_t nread = 0;
while(n > 0)
{
auto const amount = static_cast<ssize_t>((std::min)(
n, static_cast<std::size_t>(SSIZE_MAX)));
auto const result = ::read(fd_, buffer, amount);
if(result == -1)
{
auto const ev = errno;
if(ev == EINTR)
continue;
ec.assign(ev, generic_category());
return nread;
}
if(result == 0)
{
// short read
return nread;
}
n -= result;
nread += result;
buffer = static_cast<char*>(buffer) + result;
}
return nread;
}
inline
std::size_t
file_posix::
write(void const* buffer, std::size_t n, error_code& ec)
{
if(fd_ == -1)
{
ec = make_error_code(errc::invalid_argument);
return 0;
}
std::size_t nwritten = 0;
while(n > 0)
{
auto const amount = static_cast<ssize_t>((std::min)(
n, static_cast<std::size_t>(SSIZE_MAX)));
auto const result = ::write(fd_, buffer, amount);
if(result == -1)
{
auto const ev = errno;
if(ev == EINTR)
continue;
ec.assign(ev, generic_category());
return nwritten;
}
n -= result;
nwritten += result;
buffer = static_cast<char const*>(buffer) + result;
}
return nwritten;
}
} // beast
} // boost
#endif
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