Merge branch 'v0.21.x' into master

src/io/FileDescriptor.hxx

@@ -243,6 +243,12 @@ public:
 		return ::write(fd, buffer, length);
 	}
 
+	/**
+	 * Write until all of the given buffer has been written.
+	 * Throws on error.
+	 */
+	void FullWrite(const void *buffer, size_t length);
+
 #ifndef _WIN32
 	int Poll(short events, int timeout) const noexcept;