2 files changed, 121 insertions, 0 deletions
diff --git a/src/misc/FileDescriptor.cpp b/src/misc/FileDescriptor.cpp
new file mode 100644
index 0000000..92505f5
--- /dev/null
+++ b/src/misc/FileDescriptor.cpp
@@ -0,0 +1,86 @@
+#include "FileDescriptor.hpp"
+#include <cstdlib>
+#include <fcntl.h>
+#include <sys/poll.h>
+#include <unistd.h>
+#include <utility>
+
+CFileDescriptor::CFileDescriptor(int const fd)
+	: m_fd(fd) {}
+
+CFileDescriptor::CFileDescriptor(CFileDescriptor &&other) noexcept
+	: m_fd(std::exchange(other.m_fd, -1)) {}
+
+CFileDescriptor &CFileDescriptor::operator=(CFileDescriptor &&other) noexcept {
+	if (this == &other) // Shit will go haywire if there is duplicate ownership
+		abort();
+
+	reset();
+	m_fd = std::exchange(other.m_fd, -1);
+	return *this;
+}
+
+CFileDescriptor::~CFileDescriptor() {
+	reset();
+}
+
+bool CFileDescriptor::isValid() const {
+	return m_fd != -1;
+}
+
+int CFileDescriptor::get() const {
+	return m_fd;
+}
+
+int CFileDescriptor::getFlags() const {
+	return fcntl(m_fd, F_GETFD);
+}
+
+bool CFileDescriptor::setFlags(int flags) {
+	return fcntl(m_fd, F_SETFD, flags) != -1;
+}
+
+int CFileDescriptor::take() {
+	return std::exchange(m_fd, -1);
+}
+
+void CFileDescriptor::reset() {
+	if (m_fd != -1) {
+		close(m_fd);
+		m_fd = -1;
+	}
+}
+
+CFileDescriptor CFileDescriptor::duplicate(int flags) const {
+	if (m_fd == -1)
+		return {};
+
+	return CFileDescriptor{fcntl(m_fd, flags, 0)};
+}
+
+bool CFileDescriptor::isClosed() const {
+	return isClosed(m_fd);
+}
+
+bool CFileDescriptor::isReadable() const {
+	return isReadable(m_fd);
+}
+
+bool CFileDescriptor::isClosed(int fd) {
+	pollfd pfd = {
+		.fd		 = fd,
+		.events	 = POLLIN,
+		.revents = 0,
+	};
+
+	if (poll(&pfd, 1, 0) < 0)
+		return true;
+
+	return pfd.revents & (POLLHUP | POLLERR);
+}
+
+bool CFileDescriptor::isReadable(int fd) {
+	pollfd pfd = {.fd = fd, .events = POLLIN, .revents = 0};
+
+	return poll(&pfd, 1, 0) > 0 && (pfd.revents & POLLIN);
+}
diff --git a/src/misc/FileDescriptor.hpp b/src/misc/FileDescriptor.hpp
new file mode 100644
index 0000000..75aeb73
--- /dev/null
+++ b/src/misc/FileDescriptor.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <fcntl.h>
+class CFileDescriptor {
+  public:
+	CFileDescriptor() = default;
+	explicit CFileDescriptor(int const fd);
+	CFileDescriptor(CFileDescriptor &&) noexcept;
+	CFileDescriptor &operator=(CFileDescriptor &&) noexcept;
+	~CFileDescriptor();
+
+	CFileDescriptor(const CFileDescriptor &)			= delete;
+	CFileDescriptor &operator=(const CFileDescriptor &) = delete;
+
+	bool operator==(const CFileDescriptor &rhs) const {
+		return m_fd == rhs.m_fd;
+	}
+
+	bool			isValid() const;
+	int				get() const;
+	int				getFlags() const;
+	bool			setFlags(int flags);
+	int				take();
+	void			reset();
+	CFileDescriptor duplicate(int flags = F_DUPFD_CLOEXEC) const;
+
+	bool isReadable() const;
+	bool isClosed() const;
+
+	static bool isReadable(int fd);
+	static bool isClosed(int fd);
+
+  private:
+	int m_fd = -1;
+};