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/*
* This source code is released into the public domain.
*/
module;
#include <fcntl.h>
#include <unistd.h>
#include <coroutine>
#include <expected>
#include <format>
#include <stdexcept>
#include <system_error>
module nihil.posix;
import nihil.error;
import nihil.monad;
namespace nihil {
fd::fd() noexcept = default;
fd::fd(int fileno) noexcept
: m_fileno(fileno)
{
}
fd::~fd()
{
if (*this)
std::ignore = this->close();
}
fd::fd(fd &&other) noexcept
: m_fileno(std::exchange(other.m_fileno, invalid_fileno))
{
}
auto fd::operator=(this fd &self, fd &&other) noexcept -> fd &
{
if (&self != &other)
self.m_fileno = std::exchange(other.m_fileno, invalid_fileno);
return self;
}
fd::operator bool(this fd const &self) noexcept
{
return self.m_fileno != invalid_fileno;
}
auto fd::close(this fd &self) -> std::expected<void, error>
{
auto const ret = ::close(self.get());
self.m_fileno = invalid_fileno;
if (ret == 0)
return {};
return std::unexpected(error(std::errc(errno)));
}
auto fd::get(this fd const &self) -> int
{
if (self)
return self.m_fileno;
throw std::logic_error("Attempt to call get() on invalid fd");
}
auto fd::release(this fd &&self) -> int
{
if (self)
return std::exchange(self.m_fileno, invalid_fileno);
throw std::logic_error("Attempt to release an invalid fd");
}
auto dup(fd const &self) -> std::expected<fd, error>
{
auto const newfd = ::dup(self.get());
if (newfd != -1)
return newfd;
return std::unexpected(error(std::errc(errno)));
}
auto dup(fd const &self, int newfd) -> std::expected<fd, error>
{
auto const ret = ::dup2(self.get(), newfd);
if (ret != -1)
return newfd;
return std::unexpected(error(std::errc(errno)));
}
auto raw_dup(fd const &self) -> std::expected<int, error>
{
auto const newfd = ::dup(self.get());
if (newfd != -1)
return newfd;
return std::unexpected(error(std::errc(errno)));
}
auto raw_dup(fd const &self, int newfd) -> std::expected<int, error>
{
auto const ret = ::dup2(self.get(), newfd);
if (ret != -1)
return newfd;
return std::unexpected(error(std::errc(errno)));
}
auto getflags(fd const &self) -> std::expected<int, error>
{
auto const flags = ::fcntl(self.get(), F_GETFL);
if (flags != -1)
return flags;
return std::unexpected(error(std::errc(errno)));
}
auto replaceflags(fd &self, int newflags) -> std::expected<void, error>
{
auto const ret = ::fcntl(self.get(), F_SETFL, newflags);
if (ret == 0)
return {};
return std::unexpected(error(std::errc(errno)));
}
auto setflags(fd &self, int newflags) -> std::expected<int, error>
{
auto flags = co_await getflags(self);
flags |= newflags;
co_await replaceflags(self, flags);
co_return flags;
}
auto clearflags(fd &self, int clrflags) -> std::expected<int, error>
{
auto flags = co_await getflags(self);
flags &= ~clrflags;
co_await replaceflags(self, flags);
co_return flags;
}
auto getfdflags(fd const &self) -> std::expected<int, error>
{
auto const flags = ::fcntl(self.get(), F_GETFD);
if (flags != -1)
return flags;
return std::unexpected(error(std::errc(errno)));
}
auto replacefdflags(fd &self, int newflags) -> std::expected<void, error>
{
auto const ret = ::fcntl(self.get(), F_SETFD, newflags);
if (ret != -1)
return {};
return std::unexpected(error(std::errc(errno)));
}
auto setfdflags(fd &self, int newflags) -> std::expected<int, error>
{
auto flags = co_await getfdflags(self);
flags |= newflags;
co_await replacefdflags(self, flags);
co_return flags;
}
auto clearfdflags(fd &self, int clrflags) -> std::expected<int, error>
{
auto flags = co_await getfdflags(self);
flags &= ~clrflags;
co_await replacefdflags(self, flags);
co_return flags;
}
auto pipe() -> std::expected<std::pair<fd, fd>, error>
{
auto fds = std::array<int, 2>{};
if (auto const ret = ::pipe(fds.data()); ret != 0)
return std::unexpected(error(std::errc(errno)));
return {{fd(fds[0]), fd(fds[1])}};
}
auto fd::write(this fd &self, std::span<std::byte const> buffer)
-> std::expected<std::size_t, error>
{
auto const ret = ::write(self.get(), buffer.data(), buffer.size());
if (ret >= 0)
return ret;
return std::unexpected(error(std::errc(errno)));
}
auto fd::read(this fd &self, std::span<std::byte> buffer)
-> std::expected<std::span<std::byte>, error>
{
auto const ret = ::read(self.get(), buffer.data(), buffer.size());
if (ret >= 0)
return buffer.subspan(0, ret);
return std::unexpected(error(std::errc(errno)));
}
} // namespace nihil
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