system/{Resolver,Socket{Error,Util}}: move to new library libnet.a

src/net/SocketError.hxx

@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_SOCKET_ERROR_HXX
+#define MPD_SOCKET_ERROR_HXX
+
+#include "Compiler.h"
+#include "util/Error.hxx" // IWYU pragma: export
+
+#ifdef WIN32
+#include <winsock2.h>
+typedef DWORD socket_error_t;
+#else
+#include <errno.h>
+typedef int socket_error_t;
+#endif
+
+class Domain;
+
+/**
+ * A #Domain for #Error for socket I/O errors.  The code is an errno
+ * value (or WSAGetLastError() on Windows).
+ */
+extern const Domain socket_domain;
+
+gcc_pure
+static inline socket_error_t
+GetSocketError()
+{
+#ifdef WIN32
+	return WSAGetLastError();
+#else
+	return errno;
+#endif
+}
+
+gcc_const
+static inline bool
+IsSocketErrorAgain(socket_error_t code)
+{
+#ifdef WIN32
+	return code == WSAEINPROGRESS;
+#else
+	return code == EAGAIN;
+#endif
+}
+
+gcc_const
+static inline bool
+IsSocketErrorInterruped(socket_error_t code)
+{
+#ifdef WIN32
+	return code == WSAEINTR;
+#else
+	return code == EINTR;
+#endif
+}
+
+gcc_const
+static inline bool
+IsSocketErrorClosed(socket_error_t code)
+{
+#ifdef WIN32
+	return code == WSAECONNRESET;
+#else
+	return code == EPIPE || code == ECONNRESET;
+#endif
+}
+
+/**
+ * Helper class that formats a socket error message into a
+ * human-readable string.  On Windows, a buffer is necessary for this,
+ * and this class hosts the buffer.
+ */
+class SocketErrorMessage {
+#ifdef WIN32
+	char msg[256];
+#else
+	const char *const msg;
+#endif
+
+public:
+#ifdef WIN32
+	explicit SocketErrorMessage(socket_error_t code=GetSocketError());
+#else
+	explicit SocketErrorMessage(socket_error_t code=GetSocketError());
+#endif
+
+	operator const char *() const {
+		return msg;
+	}
+};
+
+static inline void
+SetSocketError(Error &error, socket_error_t code)
+{
+	const SocketErrorMessage msg(code);
+	error.Set(socket_domain, code, msg);
+}
+
+static inline void
+SetSocketError(Error &error)
+{
+	SetSocketError(error, GetSocketError());
+}
+
+gcc_const
+static inline Error
+NewSocketError(socket_error_t code)
+{
+	Error error;
+	SetSocketError(error, code);
+	return error;
+}
+
+gcc_pure
+static inline Error
+NewSocketError()
+{
+	return NewSocketError(GetSocketError());
+}
+
+#endif