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 <[email protected]>
Signed-off-by: Sander Vrijders <[email protected]>

1 files changed, 164 insertions, 0 deletions

diff --git a/src/lib/tests/time_test.c b/src/lib/tests/time_test.c
new file mode 100644
index 00000000..65f896bb
--- /dev/null
+++ b/src/lib/tests/time_test.c
@@ -0,0 +1,164 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2024
+ *
+ * Test of the time utilities
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * 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/.
+ */
+
+#define _POSIX_C_SOURCE 200809L
+
+#include <ouroboros/time.h>
+
+#include <stdio.h>
+
+static void ts_print(struct timespec * s)
+{
+        printf("timespec is %zd:%ld.\n", (ssize_t) s->tv_sec, s->tv_nsec);
+}
+
+static void tv_print(struct timeval * v)
+{
+        printf("timeval is %zd:%zu.\n", (ssize_t) v->tv_sec, (size_t) v->tv_usec);
+}
+
+static void ts_init(struct timespec * s,
+                    time_t            sec,
+                    time_t            nsec)
+{
+        s->tv_sec  = sec;
+        s->tv_nsec = nsec;
+}
+
+static void tv_init(struct timeval * v,
+                    time_t           sec,
+                    time_t           usec)
+{
+        v->tv_sec  = sec;
+        v->tv_usec = usec;
+}
+
+static int ts_check(struct timespec * s,
+                    time_t            sec,
+                    time_t            nsec)
+{
+        return s->tv_sec == sec && s->tv_nsec == nsec;
+}
+
+static int tv_check(struct timeval * v,
+                    time_t           sec,
+                    time_t           usec)
+{
+        return v->tv_sec == sec && v->tv_usec == usec;
+}
+
+int time_test(int     argc,
+              char ** argv)
+{
+        struct timespec s0;
+        struct timespec s1;
+        struct timespec s2;
+
+        struct timeval v0;
+        struct timeval v1;
+        struct timeval v2;
+
+        (void) argc;
+        (void) argv;
+
+        ts_init(&s0, 0, 0);
+        ts_init(&s1, 5, 0);
+
+        ts_add(&s0, &s1, &s2);
+        if (!ts_check(&s2, 5, 0)) {
+                printf("ts_add failed.\n");
+                ts_print(&s2);
+                return -1;
+        }
+
+        tv_init(&v0, 0, 0);
+        tv_init(&v1, 5, 0);
+
+        tv_add(&v0, &v1, &v2);
+        if (!tv_check(&v2, 5, 0)) {
+                printf("tv_add failed.\n");
+                tv_print(&v2);
+                return -1;
+        }
+
+        ts_init(&s0, 0, 500 * MILLION);
+        ts_init(&s1, 0, 600 * MILLION);
+
+        ts_add(&s0, &s1, &s2);
+        if (!ts_check(&s2, 1, 100 * MILLION)) {
+                printf("ts_add with nano overflow failed.\n");
+                ts_print(&s2);
+                return -1;
+        }
+
+        tv_init(&v0, 0, 500 * 1000);
+        tv_init(&v1, 0, 600 * 1000);
+
+        tv_add(&v0, &v1, &v2);
+        if (!tv_check(&v2, 1, 100 * 1000)) {
+                printf("tv_add with nano overflow failed.\n");
+                tv_print(&v2);
+                return -1;
+        }
+
+        ts_init(&s0, 0, 0);
+        ts_init(&s1, 5, 0);
+
+        ts_diff(&s0, &s1, &s2);
+        if (!ts_check(&s2, -5, 0)) {
+                printf("ts_diff failed.\n");
+                ts_print(&s2);
+                return -1;
+        }
+
+        tv_init(&v0, 0, 0);
+        tv_init(&v1, 5, 0);
+
+        tv_diff(&v0, &v1, &v2);
+        if (!tv_check(&v2, -5, 0)) {
+                printf("tv_diff failed.\n");
+                tv_print(&v2);
+                return -1;
+        }
+
+        ts_init(&s0, 0, 500 * MILLION);
+        ts_init(&s1, 0, 600 * MILLION);
+
+        ts_diff(&s0, &s1, &s2);
+        if (!ts_check(&s2, -1, 900 * MILLION)) {
+                printf("ts_diff with nano underflow failed.\n");
+                ts_print(&s2);
+                return -1;
+        }
+
+        tv_init(&v0, 0, 500 * 1000);
+        tv_init(&v1, 0, 600 * 1000);
+
+        tv_diff(&v0, &v1, &v2);
+        if (!tv_check(&v2, -1, 900 * 1000)) {
+                printf("tv_diff with nano underflow failed.\n");
+                tv_print(&v2);
+                return -1;
+        }
+
+        return 0;
+}