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, 107 insertions, 0 deletions

diff --git a/src/irmd/reg/tests/proc_test.c b/src/irmd/reg/tests/proc_test.c
new file mode 100644
index 00000000..5c9dd865
--- /dev/null
+++ b/src/irmd/reg/tests/proc_test.c
@@ -0,0 +1,107 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2024
+ *
+ * The IPC Resource Manager - Registry - Processes - Unit Tests
+ *
+ *    Dimitri Staessens <dimitri@ouroboros.rocks>
+ *    Sander Vrijders   <sander@ouroboros.rocks>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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., http://www.fsf.org/about/contact/.
+ */
+
+#include "../proc.c"
+
+#define TEST_PID  65534
+#define TEST_PROG "usr/bin/testprog"
+
+static int test_reg_proc_create(void)
+{
+        struct reg_proc * proc;
+        struct proc_info  info = {
+                .pid =  TEST_PID,
+                .prog = TEST_PROG
+        };
+
+        proc = reg_proc_create(&info);
+        if (proc == NULL) {
+                printf("Failed to create proc.\n");
+                goto fail;
+        }
+
+        reg_proc_destroy(proc);
+
+        return 0;
+ fail:
+        return -1;
+}
+
+static int test_reg_proc_add_name(void)
+{
+        struct reg_proc * proc;
+        struct proc_info  info = {
+                .pid  = TEST_PID,
+                .prog = TEST_PROG
+        };
+
+        char * name = "testname";
+
+        proc = reg_proc_create(&info);
+        if (proc == NULL) {
+                printf("Failed to create proc.\n");
+                goto fail;
+        }
+
+        if (reg_proc_add_name(proc, name) < 0) {
+                printf("Failed to add name.");
+                goto fail;
+        }
+
+        if (proc->n_names != 1) {
+                printf("n_names not updated.\n");
+                goto fail;
+        }
+
+        if (!reg_proc_has_name(proc, name)) {
+                printf("Name not found.\n");
+                goto fail;
+        }
+
+        reg_proc_del_name(proc, name);
+
+        if (proc->n_names != 0) {
+                printf("n_names not updated.\n");
+                goto fail;
+        }
+
+        reg_proc_destroy(proc);
+
+        return 0;
+ fail:
+        return -1;
+}
+
+int proc_test(int     argc,
+              char ** argv)
+{
+        int res = 0;
+
+        (void) argc;
+        (void) argv;
+
+        res |= test_reg_proc_create();
+
+        res |= test_reg_proc_add_name();
+
+        return res;
+}