irmd: Revise IRMd internals

This is a full revision of the IRMd internal implementation.

The registry is now a proper subcomponent managing its own internal
lock (a single mutex). Some tests are added for the registry and its
data structures. Some macros for tests are added in <ouroboros/test.h>.

Flow allocation is now more symmetric between the client side (alloc)
and server size (accept). Each will create a flow in pending state
(ALLOC_PENDING/ACCEPT_PENDING) that is potentially fulfilled by an
IPCP using respond_alloc and respond_accept primitives. Deallocation
is split in flow_dealloc (application side) and ipcp_flow_dealloc
(IPCP side) to get the flow in DEALLOC_PENDING and DEALLOCATED state.

Cleanup of failed flow allocation is now properly handled instead of
relying on the sanitizer thread. The new sanitizer only needs to
monitor crashed processes.

On shutdown, the IRMd will now detect hanging processes and SIGKILL
them and clean up their fuse mountpoints if needed.

A lot of other things have been cleaned up and shuffled around a bit.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 44 insertions, 0 deletions

diff --git a/include/ouroboros/proc.h b/include/ouroboros/proc.h
new file mode 100644
index 00000000..d0b010bb
--- /dev/null
+++ b/include/ouroboros/proc.h
@@ -0,0 +1,44 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2024
+ *
+ * Processes and Programs
+ *
+ *    Dimitri Staessens <dimitri@ouroboros.rocks>
+ *    Sander Vrijders   <sander@ouroboros.rocks>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#ifndef OUROBOROS_LIB_PROC_H
+#define OUROBOROS_LIB_PROC_H
+
+#include <sys/types.h>
+
+#define PROG_NAME_SIZE 255
+#define PROG_PATH_SIZE 255
+
+/* Processes */
+struct proc_info {
+        pid_t pid;
+        char  prog[PROG_NAME_SIZE + 1];  /* program instantiated */
+
+};
+
+/* Programs */
+struct prog_info {
+        char name[PROG_NAME_SIZE + 1];
+        char path[PROG_PATH_SIZE + 1];
+};
+
+#endif /* OUROBOROS_LIB_PROC_H */
\ No newline at end of file