Beginning on mds-libinput

Signed-off-by: Mattias Andrée <maandree@kth.se>

2 files changed, 248 insertions, 0 deletions

diff --git a/src/mds-libinput.c b/src/mds-libinput.c
new file mode 100644
index 0000000..1edf848
--- /dev/null
+++ b/src/mds-libinput.c
@@ -0,0 +1,222 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014, 2015  Mattias Andrée (maandree@member.fsf.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 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/>.
+ */
+#include "mds-libinput.h"
+/* TODO: This server should wait for `Command: get-vt` to be available,
+         query the active VT and connect to that TTY instead of stdin. */
+
+#include <libmdsserver/macros.h>
+#include <libmdsserver/util.h>
+#include <libmdsserver/mds-message.h>
+
+#include <inttypes.h>
+#define reconnect_to_display() -1
+
+
+
+#define MDS_LIBINPUT_VARS_VERSION  0
+
+
+
+/**
+ * This variable should declared by the actual server implementation.
+ * It must be configured before `main` is invoked.
+ * 
+ * This tells the server-base how to behave
+ */
+server_characteristics_t server_characteristics =
+  {
+    .require_privileges = 1,
+    .require_display = 1,
+    .require_respawn_info = 0,
+    .sanity_check_argc = 1,
+    .fork_for_safety = 0,
+    .danger_is_deadly = 0
+  };
+
+
+
+/**
+ * Value of the ‘Message ID’ header for the next message
+ */
+static uint32_t message_id = 1;
+
+/**
+ * Buffer for received messages
+ */
+static mds_message_t received;
+
+/**
+ * Whether the server is connected to the display
+ */
+static int connected = 1;
+
+
+
+/**
+ * Send a full message even if interrupted
+ * 
+ * @param   message:const char*  The message to send
+ * @param   length:size_t        The length of the message
+ * @return  :int                 Zero on success, -1 on error
+ */
+#define full_send(message, length)  \
+  ((full_send)(socket_fd, message, length))
+
+
+/**
+ * This function will be invoked before `initialise_server` (if not re-exec:ing)
+ * or before `unmarshal_server` (if re-exec:ing)
+ * 
+ * @return  Non-zero on error
+ */
+int __attribute__((const)) preinitialise_server(void)
+{
+  return 0;
+}
+
+
+/**
+ * This function should initialise the server,
+ * and it not invoked after a re-exec.
+ * 
+ * @return  Non-zero on error
+ */
+int initialise_server(void)
+{
+  int stage = 0;
+  
+  fail_if (server_initialised());  stage++;
+  fail_if (mds_message_initialise(&received));
+  
+  return 0;
+  
+ fail:
+  xperror(*argv);
+  if (stage >= 1)  mds_message_destroy(&received);
+  return 1;
+}
+
+
+/**
+ * This function will be invoked after `initialise_server` (if not re-exec:ing)
+ * or after `unmarshal_server` (if re-exec:ing)
+ * 
+ * @return  Non-zero on error
+ */
+int postinitialise_server(void)
+{
+  if (connected)
+    return 0;
+  
+  fail_if (reconnect_to_display());
+  connected = 1;
+  return 0;
+ fail:
+  mds_message_destroy(&received);
+  return 1;
+}
+
+
+/**
+ * Calculate the number of bytes that will be stored by `marshal_server`
+ * 
+ * On failure the program should `abort()` or exit by other means.
+ * However it should not be possible for this function to fail.
+ * 
+ * @return  The number of bytes that will be stored by `marshal_server`
+ */
+size_t marshal_server_size(void)
+{
+  size_t rc = 2 * sizeof(int) + sizeof(uint32_t);
+  rc += mds_message_marshal_size(&received);
+  return rc;
+}
+
+
+/**
+ * Marshal server implementation specific data into a buffer
+ * 
+ * @param   state_buf  The buffer for the marshalled data
+ * @return             Non-zero on error
+ */
+int marshal_server(char* state_buf)
+{
+  buf_set_next(state_buf, int, MDS_LIBINPUT_VARS_VERSION);
+  buf_set_next(state_buf, int, connected);
+  buf_set_next(state_buf, uint32_t, message_id);
+  mds_message_marshal(&received, state_buf);
+  
+  mds_message_destroy(&received);
+  return 0;
+}
+
+
+/**
+ * Unmarshal server implementation specific data and update the servers state accordingly
+ * 
+ * On critical failure the program should `abort()` or exit by other means.
+ * That is, do not let `reexec_failure_recover` run successfully, if it unrecoverable
+ * error has occurred or one severe enough that it is better to simply respawn.
+ * 
+ * @param   state_buf  The marshalled data that as not been read already
+ * @return             Non-zero on error
+ */
+int unmarshal_server(char* state_buf)
+{
+  /* buf_get_next(state_buf, int, MDS_LIBINPUT_VARS_VERSION); */
+  buf_next(state_buf, int, 1);
+  buf_get_next(state_buf, int, connected);
+  buf_get_next(state_buf, uint32_t, message_id);
+  fail_if (mds_message_unmarshal(&received, state_buf));
+  
+  return 0;
+ fail:
+  xperror(*argv);
+  mds_message_destroy(&received);
+  return -1;
+}
+
+
+/**
+ * Attempt to recover from a re-exec failure that has been
+ * detected after the server successfully updated it execution image
+ * 
+ * @return  Non-zero on error
+ */
+int __attribute__((const)) reexec_failure_recover(void)
+{
+  return -1;
+}
+
+
+/**
+ * This function is called when a signal that
+ * signals that the system to dump state information
+ * and statistics has been received
+ * 
+ * @param  signo  The signal that has been received
+ */
+void received_info(int signo)
+{
+  SIGHANDLER_START;
+  (void) signo;
+  iprintf("next message ID: %" PRIu32, message_id);
+  iprintf("connected: %s", connected ? "yes" : "no");
+  SIGHANDLER_END;
+}
+
diff --git a/src/mds-libinput.h b/src/mds-libinput.h
new file mode 100644
index 0000000..ad4591f
--- /dev/null
+++ b/src/mds-libinput.h
@@ -0,0 +1,26 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014, 2015  Mattias Andrée (maandree@member.fsf.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 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 MDS_MDS_LIBINPUT_H
+#define MDS_MDS_LIBINPUT_H
+
+
+#include "mds-base.h"
+
+
+#endif
+