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diff --git a/src/state.h b/src/state.h
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+/**
+ * coopgammad -- Cooperative gamma server
+ * Copyright (C) 2016  Mattias Andrée (maandree@kth.se)
+ * 
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef STATE_H
+#define STATE_H
+
+
+#include "types/message.h"
+#include "types/ring.h"
+#include "types/output.h"
+
+#include <libgamma.h>
+
+#include <stddef.h>
+#include <signal.h>
+
+
+
+#ifndef GCC_ONLY
+# if defined(__GNUC__) && !defined(__clang__)
+#  define GCC_ONLY(...)  __VA_ARGS__
+# else
+#  define GCC_ONLY(...)  /* nothing */
+# endif
+#endif
+
+
+
+/**
+ * The name of the process
+ */
+extern char* restrict argv0;
+
+/**
+ * The real pathname of the process's binary,
+ * `NULL` if `argv0` is satisfactory
+ */
+extern char* restrict argv0_real;
+
+/**
+ * Array of all outputs
+ */
+extern struct output* restrict outputs;
+
+/**
+ * The nubmer of elements in `outputs`
+ */
+extern size_t outputs_n;
+
+/**
+ * The server socket's file descriptor
+ */
+extern int socketfd;
+
+/**
+ * Has the process receive a signal
+ * telling it to re-execute?
+ */
+extern volatile sig_atomic_t reexec;
+
+/**
+ * Has the process receive a signal
+ * telling it to terminate?
+ */
+extern volatile sig_atomic_t terminate;
+
+/**
+ * Has the process receive a to
+ * disconnect from or reconnect to
+ * the site? 1 if disconnct, 2 if
+ * reconnect, 0 otherwise.
+ */
+extern volatile sig_atomic_t connection;
+
+/**
+ * List of all client's file descriptors
+ * 
+ * Unused slots, with index less than `connections_used`,
+ * should have the value -1 (negative)
+ */
+extern int* restrict connections;
+
+/**
+ * The number of elements allocated for `connections`
+ */
+extern size_t connections_alloc;
+
+/**
+ * The index of the first unused slot in `connections`
+ */
+extern size_t connections_ptr;
+
+/**
+ * The index of the last used slot in `connections`, plus 1
+ */
+extern size_t connections_used;
+
+/**
+ * The clients' connections' inbound-message buffers
+ */
+extern struct message* restrict inbound;
+
+/**
+ * The clients' connections' outbound-message buffers
+ */
+extern struct ring* restrict outbound;
+
+/**
+ * Is the server connect to the display?
+ * 
+ * Set to true before the initial connection
+ */
+extern int connected;
+
+/**
+ * The adjustment method, -1 for automatic
+ */
+extern int method;
+
+/**
+ * The site's name, may be `NULL`
+ */
+extern char* restrict sitename;
+
+/**
+ * The libgamma site state
+ */
+extern libgamma_site_state_t site;
+
+/**
+ * The libgamma partition states
+ */
+extern libgamma_partition_state_t* restrict partitions;
+
+/**
+ * The libgamma CRTC states
+ */
+extern libgamma_crtc_state_t* restrict crtcs;
+
+
+
+/**
+ * Destroy the state
+ */
+void state_destroy(void);
+
+/**
+ * Marshal the state
+ * 
+ * @param   buf  Output buffer for the marshalled data,
+ *               `NULL` to only measure how many bytes
+ *               this buffer needs
+ * @return       The number of marshalled bytes
+ */
+size_t state_marshal(void* restrict buf);
+
+/**
+ * Unmarshal the state
+ * 
+ * @param   buf  Buffer for the marshalled data
+ * @return       The number of unmarshalled bytes, 0 on error
+ */
+GCC_ONLY(__attribute__((nonnull)))
+size_t state_unmarshal(const void* restrict buf);
+
+
+#endif
+